1 MODULAR SYSTEM OF HNV TYPE TREATMENT PLANTS PURPOSE In case of higher amounts of wastewater, that is from few private houses or the whole settlement wastewater treatment plants are installed from separate factory made wastewater treatment blocks. Using blocks of wastewater treatment, there has been established the modular system of wastewater treatment plants, by applying the system for wastewater treatment of newly built settlements or city quarters. Installation of modular treatment plants from separate blocks results in easy selection, maintenance, changing of treatment plants, depending on amounts of wastewater, pollution and other factors. On change of wastewater collection conditions, that is on change of the amount of the inlet wastewater or on increase/decrease of pollution, modular systems may be adjoined, if debit increases or turned-off, if debit decreases; thus, it is possible to achieve especially good treatment indexes and to reduce maintenance expenses. NOTE: Operation technology of modular treatment facilities, outlay, service and maintenance instructions are selected individually. Settlement Biological treatment plants of domestic wastewater Perspective facilities Newly built settlements Into an open-type waters
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MODULAR SYSTEM OF HNV TYPE TREATMENT PLANTS
PURPOSE In case of higher amounts of wastewater, that is from few private houses or the whole settlement wastewater treatment plants are installed from separate factory made wastewater treatment blocks. Using blocks of wastewater treatment, there has been established the modular system of wastewater treatment plants, by applying the system for wastewater treatment of newly built settlements or city quarters. Installation of modular treatment plants from separate blocks results in easy selection, maintenance, changing of treatment plants, depending on amounts of wastewater, pollution and other factors. On change of wastewater collection conditions, that is on change of the amount of the inlet wastewater or on increase/decrease of pollution, modular systems may be adjoined, if debit increases or turned-off, if debit decreases; thus, it is possible to achieve especially good treatment indexes and to reduce maintenance expenses. NOTE: Operation technology of modular treatment facilities, outlay, service and maintenance instructions are selected individually.
Settlement Biological treatment plants of domestic wastewater
Perspective facilities
Newly built settlements
Into an open-type waters
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SAMPLES OF APPLICATION OF MODULAR SYSTEM OF HNV TYP E TREATMENT PLANTS
60m3/p treatment plants of domestic wastewater for settlements
8. Distribution manhole with reduction chamber 9. Biological treatment plant HNV-N-30 10. Secondary settling tank 11. Sludge stabiliser 12. Flow collection manhole 13. Manhole for automatic debit calculation 14. Reference manhole for automatic collection of samples
15. Intermediate manhole ∅1,200
16. Intermediate manhole ∅800 17. Airblower EL-120 18. Automated station for collection of samples
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Description of the technological scheme
Factory made modular biological treatment units are provided to be installed for wastewater treatment in settlements.
Firstly, from the pressure line, wastewater enters the pressure reduction chamber (1). Pressure reduction chamber is provided in case wastewater shall be fed to treatment facilities with the help of the pump station. Then the flow of wastewater flows through automatic grating (2), where large-scale silt is withheld (paper, cloths, etc.). Manually controlled grating (3) is installed in case of emergency. Wastewater, cleaned from large-scale silt, enters the aerated sand trap (4), where wastewater is cleaned from large–scale particles (sand, gravel, soil, etc.). Sand separator (5) is provided for sand dewatering. After sand traps, wastewater enters flow alignment reservoir (7), from which with the help of the pump wastewater is fed to the distribution manhole (8) and further fed at an equal flow into two parallel chains of biological treatment plants of domestic wastewater HNV-N-30 (9, 10). In case of malfunction of pumps or on occurrence of higher debit then the designed one, emergency line for bypassing the flow of wastewater is provided. Air is supplied to the aeration chamber with the help of airblowers (6). From the aeration chamber the mixture of sludge enters the vertical secondary settling tank (10), where cleaned wastewater is separated from the activated and excess sludge. The designed wastewater treatment duration in the secondary settling tank is 3 hours. Activated circulating sludge is returned to the aeration chamber with the help of the pump and excess sludge is discharged to the aerational sludge stabiliser (11). Air is supplied to the sludge stabiliser with the help of airblowers (17). The sludge, thickened up to 96% of humidity, is transported into regional sludge draining sites. After secondary settling tanks through the flow collection manhole (12) clean water further flows through the reference Debit measurement well (13) and the reference manhole for collection of samples (14), then cleaned water flows-out into the place foreseen according tot the project. Wastewater treatment plants are fully automated. Airblowers are controlled by frequency drives.
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80m3/p treatment plants of domestic wastewater for settlements
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Technological scheme of 80m3/p treatment plants of domestic wastewater for settlements
Specification of the technological scheme:
1. Pressure reduction chamber 2. Sand trap AS2 3. Sand accumulation tank 4. Distribution manhole 5. Biological treatment plant HNV-P-40 6. Sludge thickener 7. Secondary settling tank 8. Flow collection manhole 9. Reference Debit measurement well and collection of samples 10. Airblower
Description of the technological scheme: Factory made modular biological treatment units are recommended to be installed for wastewater treatment in settlements. Wastewater from the settlement enters the pump station, from which is further fed to the pressure reduction manhole (1). From the pressure reduction manhole wastewater enters the aerated sand trap (2). Sand settled on the bottom of the sand trap is repumped into the nearby sand accumulation tank (3) by the help of the pump. Pump working duration is 5–100 sec., working cycle, which is normally 2–3 times per day, is adjusted during facility commissioning works. After the sand trap, wastewater, cleaned from mineral additives, enters the biological treatment plant HNV-P-40 (5) through the flow distribution manhole (4). Biological treatment plant constructs from a primary settling tank, an aerobic reactor (5) and a secondary settling tank (7). Firstly, wastewater in the biological treatment plant enters the primary settling tank, present in one tank with the aerobic reactor. Wastewater treatment duration in the primary settling tank is 2 hours. Constant discharge of green sludge into the Sludge thickener (6) is anticipated. Air is supplied to the aeration chamber with the help of airblowers (10). From the aeration chamber the mixture of sludge enters the vertical secondary settling tank (7), where cleaned wastewater is separated from the activated and excess sludge. The designed wastewater treatment duration in the secondary settling tank is 3 hours. Activated circulating sludge is returned to the aeration chamber with the help of the pump and excess sludge is discharged into the Sludge thickener (6). The sludge, thickened up to 96% of humidity, is pumped-off the Sludge
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thickener and is transported into regional sludge draining sites. After secondary settling tanks cleaned water flows through flow collection manhole (8), further – through the reference Debit measurement well and collection of samples (9), then cleaned water flows out to the place designed according to the project. Two separate non-interdependent technological chains are installed.
105m3/p treatment plants of domestic wastewater for settlements
Technological scheme of 105m3/p treatment plants of domestic wastewater for settlements
Specification of the technological scheme
1. Pressure reduction chamber 2. Sand trap AS2 3. Sand accumulation tank 4. Distribution manhole 5. Biological treatment plant HNV-P-35 (3 units) 6. Secondary settling tank 7. Sludge thickener 8. Intermediate manhole 9. Flow collection manhole 10. Debit measurement well 11. Reference manhole for collection of samples 12. The box for airblowers
Description of the technological scheme Factory made modular biological treatment units are recommended to be installed for wastewater treatment in settlements. Wastewater from the settlement enters the pump station, from which is further fed to the pressure reduction manhole (1). From the pressure reduction manhole wastewater enters the aerated sand trap (2). Sand settled on the bottom of the sand trap is repumped into the nearby sand accumulation tank (3) by the help of the pump. Pump working duration is 5–100 sec., working cycle, which is normally 2–3 times per day, is adjusted during facility commissioning works. After the sand trap, wastewater, cleaned from mineral additives, enters three separate independent biological treatment plants HNV-P-35 (5) through the flow distribution manhole (4). Biological treatment plant constructs from a primary settling tank, an aerobic reactor (5) and a secondary settling tank (6). Firstly,
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wastewater in the biological treatment plant enters the primary settling tank, present in one tank with the aerobic reactor. Wastewater treatment duration in the primary settling tank is 2 hours. Constant discharge of green sludge into the Sludge thickener (7) is anticipated. According to BOD5, the designed percentage of pollution reduction in the settling tank is 25%. After the primary settling tank wastewater enters the aeration chamber. Air is supplied to the aeration chamber with the help of airblowers (12). From the aeration chamber the mixture of sludge enters the vertical secondary settling tank (6), where cleaned wastewater is separated from the activated and excess sludge. The designed wastewater treatment duration in the secondary settling tank is 3 hours. Activated circulating sludge is returned to the aeration chamber with the help of the pump and excess sludge is discharged into the Sludge thickener (7). The sludge, thickened up to 96% of humidity, is pumped-off the Sludge thickener and is transported into the regional sludge draining sites. After secondary settling tanks cleaned water flows through the flow collection manhole (9), further – through the reference Debit measurement well (10) and collection of samples (11), then cleaned water flows out to the place designed according to the project. Three separate non-interdependent technological chains are installed.
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225m3/p treatment plants of domestic wastewater for settlements
Technological scheme of 225m3/p treatment plants of domestic wastewater
for settlements
6. Airblowers 7. Alignment reservoir 8. Distribution manhole with reduction chamber 9. Biological treatment plant – aerotank 10. Secondary settling tank 11. Sludge stabiliser
12. Intermediate manhole 13. Flow collection manhole 14. Reference Debit measurement well 15. Reference manhole for collection of samples 16. Sludge dewatering equipment
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Description of the technological scheme
According to the aforementioned technological scheme, firstly, wastewater enters the pressure reduction chamber (1). Pressure reduction chamber is provided in case wastewater shall be fed to treatment facilities with the help of the pump station. Then the flow of wastewater flows through the automatic grating (2), where large-scale silt is withheld (paper, cloths, etc.). Manually controlled grating (3) is installed in case of emergency. Wastewater, cleaned from large-scale silt, enters the aerated sand trap (4), where wastewater is cleaned from large–scale particles (sand, gravel, soil, etc.). Sand box (5) is provided for sand dewatering. After sand traps, wastewater enters flow alignment reservoir (7), from which, with the help of a pump, wastewater is fed to the distribution manhole (8) and further fed at an equal flow into three parallel chains of biological treatment plants of domestic wastewater (9, 10).
Air is supplied to the aeration chamber with the help of airblowers (6). From the aeration chamber the mixture of sludge enters the secondary settling tank (10), where cleaned wastewater is separated from the activated and excess sludge. After aeration chamber, sludge mixture shall enter secondary settling tanks, from which the settled sludge shall be returned to the alternating mode chamber with the help of the air pump, and the cleared wastewater shall flow-out to the reference manhole. The designed treatment plants shall allow changing the technological process according to the load of treatment facilities, temperature and other conditions. With the help of the pump excess sludge shall be periodically discharged into the sludge stabiliser (11), from which with the help of the pump it is further discharged into the sludge dewatering equipment (16). After secondary settling tanks, cleaned water flows through the flow collection manhole (13), further – through the reference Debit measurement well (14) and reference manhole for collection of samples (15), then cleaned water flows out to the place designed according to the project. Wastewater treatment plants are fully automated. Airblowers are controlled by frequency drives.
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500m3/p treatment plants of domestic wastewater for settlements
Technological scheme of 500m3/p treatment plants of domestic wastewater for settlements
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9. Control panel 10. UV lamps 11. Sand filters 12. Flow alignment tank 13. Sludge thickener 14. Flow reduction and distribution manhole 15. Flow alignment chamber 16. Primary settling tank
17. Aerotank with the prolonged aeration chamber 18. Vertical secondary settling tank 19. Flow collection manhole 20. Pump station 21. Excess sludge collection manhole 22. Sludge manhole 23. Clean water tank 24. Screen filter
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Description of the technological scheme
According to the aforementioned technological scheme, firstly, wastewater enters the pressure reduction chamber (1). Pressure reduction chamber is provided in case wastewater shall be fed to treatment facilities with the help of the pump station. Then the flow of wastewater flows through the automatic grating (2), where large–scale silt is withheld (paper, cloths, etc.). Manually controlled grating (3) is installed in case of emergency. Wastewater, cleaned from large–scale silt, enters the aerated sand trap (4), where wastewater is cleaned from large–scale particles (sand, gravel, soil, etc.). Sand separator (5) is provided for sand dewatering. After sand traps, wastewater enters flow alignment reservoir (12), from which with the help of a pump wastewater is fed to distribution manhole (14) and further fed at an equal flow into five parallel chains of biological treatment plants of domestic wastewater: primary settling tanks (16), aerotanks (17), secondary settling tanks (18). Wastewater treatment duration in the primary settling tank is 2 hours. The pump is installed in primary settling tanks for discharge of green sludge. With the help of the pump, green sludge enters Sludge thickener (13) through the sludge manhole (22). After the primary settling tank (16) wastewater enters the biological treatment plant of prolonged aeration (17). Technological process is designed so that in absence of the designed organic pollution, it would be possible to direct sludge through the manhole (15) directly into the aerotank. Oxygen is fed into aerotanks from airblowers (8), fitted in the room. From the aeration chamber, the mixture of sludge enters the secondary settling tank (18), where cleaned wastewater is separated from the activated and excess sludge. With the help of the pump circulating sludge shall be returned to aerotanks and excess sludge shall be periodically discharged into the sludge stabiliser (13), from which with the help of the pump it is further discharged into the sludge dewatering equipment (7). After secondary settling tanks, cleaned water further enters the pump station (20) through the flow collection manhole (9). From the pump station (20) cleaned water further enters the screen filter (24) and then – sand filters (11) for additional treatment. After sand filters wastewater enters through UV lamps (10) and enters into the clean water tank (23), which is intended for rinsing – filter regeneration (11) and (24). After the tank, treated water flows-out into the place designed according to the project.
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1,500m3/p treatment plants of domestic wastewater for settlements
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Technological scheme of 1,500m3/p treatment plants of domestic wastewater for settlements
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Specification of the technological scheme
1. Wastewater acceptance tank 2. Automatic grating 3. Manual grating 4. Sand traps 5. Flow alignment tank 6. Flow reduction and distribution manhole 7. Distribution manhole 8. Primary settling tank 9. Aerotank with the prolonged aeration chamber 10. Vertical secondary settling tank 11. Flow collection manhole 12. Pump station 13. Sand filters 14. UV lamps 15. Pump station of cleaned water 16. Sludge thickener 17. Sand separator 18. Airblowers
Description of the technological scheme
According to the aforementioned technological scheme, firstly, wastewater enters the wastewater collection tank (1). Pressure reduction chamber is provided in case wastewater shall be fed to treatment facilities with the help of the pump station. Then the flow of wastewater flows through the automatic grating (2), where large-scale silt is withheld (paper, cloths, etc.). Manually controlled grating (3) is installed in case of emergency. Wastewater, cleaned from large-scale silt enters the aerated sand trap (4), where wastewater is cleaned from large–scale particles (sand, gravel, soil, etc.). Sand separator (17) is provided for sand dewatering. After sand traps, wastewater enters flow alignment reservoir (5), from which, with the help of a pump, wastewater is fed to the distribution manhole (6) and further fed at an equal flow into four parallel chains of biological treatment plants of domestic wastewater: primary settling tanks (8), aerotanks (9), secondary settling tanks (10). Wastewater treatment duration in the primary settling tank is 2 hours. The pump is installed in primary settling tanks for discharge of green sludge. With the help of the pump, green sludge enters Sludge thickener (16) through the sludge manhole. After the primary settling tank (8), wastewater enters the biological treatment plant of prolonged aeration (9). Technological process is designed so that in absence of the designed organic pollution, it would be possible to direct sludge through the manhole (7) directly into the aerotank. Oxygen is fed into aerotanks from airblowers (18), fitted in the room. From the aeration chamber, the mixture of sludge enters the secondary settling tank (10), where cleaned wastewater is separated from the activated and excess sludge. Circulating sludge shall be returned to aerotanks with the help of the pump and excess sludge shall be periodically discharged into the sludge stabiliser (16). After secondary settling tanks, cleaned water further enters the pump station (12) through the flow collection manhole (11). From the pump station (12) cleaned water enters sand filters (13) for additional treatment. After sand filters, wastewater flows through UV lamps (14) and enters the pump station (15). After the pump station cleaned water flows-out into the place designed according to the project. NOTE: when installing modular systems, they can be adjoined, so reducing their installation expenses, avoiding ground and surface water accumulation and entering into the facilities.
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ADDITIONAL EQUIPMENT FOR HNV TYPE BIOLOGICAL TREATM ENT PLANTS OF
DOMESTIC WASTEWATER FOR TOWNSHIPS MECHANICAL TREATMENT EQUIPMENT In most cases, prior to feeding all wastewater into the main treatment plants, they are treated in mechanical treatment equipment. Large–scale mineral additives (sand, slag, etc.), surface (grease, oil, etc.), floating and different other materials that are undesirable in other wastewater treatment plants are eliminated in this equipment. Composition and types of mechanical treatment equipment depends on the nature of additives that are required to be eliminated, amount of wastewater, its flowing unevenness, degree of treatment, full technological scheme, local conditions, economic indexes, etc. Mechanical treatment – it is preparatory (primary) wastewater treatment prior to biological treatment. Only few samples of mechanical treatment are provided herein. GRATING Different type and construction grating shall be selected depending on amount of silt, level of maintenance and other parameters. This may be manual, mechanical, automatic, etc. grating, grating chambers. Their purpose is to withhold large–scale solid silt, different floating rubbish (cloths, pickings, stones, pieces of wood, etc.) and to protect further equipment and piping against clogging or damaging. Samples of imported mechanical–automatic grating MEVA MONOSCREEN and Traidenis UAB produced grating are provided herein. Manual grating chamber
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PASTABA: geometriniai parametrai ir konstrukcinisišpildymas, parenkamas kiekvienu atveju individuliai.
informacija yra UAB "Traidenis" nuosavyb ÷.
Scheme of manual grating chamber H∗ Designed measurement 5. Stainless steel rake for sediment 1. Decorative riser with a lid 6. Stainless steel silt bag 2. Tank body 7. Outlet coupling DN 160 3. Inlet coupling DN 160 8. Chamber partition 4. Stainless steel grating with 7mm clearance 9. Anchorage ears
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Installation Manual grating chamber is used as underground equipment. The chamber is produced from a vertical glass-fibre tank. Diameter of grating chamber D – 1,500mm, other dimensions (H*, H, d1, d2) depend on deepening and pipe diameter of wastewater lines of a certain object. Supplementary collection (riser rings) depends on manifold deepening. Subject to the selected place, treatment plant may be installed in a green lawn or under the roadway (not recommended due to uncomfortable maintenance). Maintenance of manual grating chamber depends on inlet wastewater parameters of a certain object; it is recommended to check grating chamber once per day, in order to avoid grating gaps from clogging.
NOTE: geometric parameters and constructional outlay of manual grating are every time selected individually. Mechanical–automatic grating
Mechanical grating MEVA MONOSCREEN
Rotational grating MEVA MONOSCREEN is fitted in the body, constructed from two robust steel slabs. End slabs are connected with cross-beams. Rotational grating and worm-gear motor are fitted inside the body. Power transmission unit, transmitting motion from worm-gear motor to moving parts of the rotational grating, is protected with a steel cover. Rotational grating MEVA MONOSCREEN is constructed from two interchanging segment systems, one of which is fixed and other is moving. Both segment systems are installed on cross-axes. Rotational grating is installed, so that one segment is fixed and the other is moving. Clearance between moving and fixed segments – clearance width (1mm). Moving segments lift collected silt and move it upwards. In this way, silt, collected by rotational grating, is gradually lifted upwards until they reach the upper limit and then falls into the hopper or into the transportation unit for further treatment.
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Technical characteristics
Overhaul dimensions of mechanical grating
Geometric parameters of mechanical grating Dimensions RSM7 RSM8 RSM15 RSM20 RSM26 RSM31 RSM35 RSM38 A – height, mm 640 750 1450 2040 2565 3080 3500 3800 B – length, mm 940 1110 1670 2845 3285 4115 4500 4590 C – width, mm 280–480 300–650 400–1100 585–1885 585–1885 680–1880 680–1880 680–1880 H1max – level of passing water flow
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H1min – level of passing water flow
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In open parts of rotational grating MEVA MONOSCREEN that are not fitted in a channel or otherwise covered have safety covers that are easily opened.
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HYDROLIFT Hydraulic press is intended for thickening and transportation of biodegradable skim and sediment from grating, floaters and primary settling tanks.Compaction power of skimis easily adjusted. Skim compaction press may develop up to 8t compaction power. Rhythm of piston motion is adjustable. Minimum duration of double motion is 15sec. Hydrolift is fastened to the grating, floater by special fasteners, construction of which is predetermined by technical features of the equipment
Hydrolift
Technical data Supply voltage 220/380V, 50Hz Power 1.5kW Push strength 0.1÷0.8t Lifting height 0.5÷3m (fulfilled according to a certain order) Length L = 1.5m Clearance up to the hydrostation I = 1.0÷8.0m
Branch-pipe Digester
Hydrocylinder Hydrostation
Wastewater container
Grating Piston
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SAND TRAPS General
Sand trap – it is the unit intended for separation of sand and similar mineral materials from wastewater. Pollutants separated from domestic wastewater in the sand trap contain a lot of sand, gravel, slag and other solid mineral materials that are smaller than organic pollutants present in wastewater. Pollutants settling in sand traps have own gravity of roughly 2.65.
Sand traps: 1. protect mechanical wastewater equipment against abrasive impact of pollutants and quick
wear; 2. protect equipment of wastewater treatment plants against hardly eliminated sludge
accumulation; 3. allow avoiding frequent emptying of wastewater sludge digesters that would be necessary
in digesters, when large amounts of sand accumulate. Operation of sand traps is based on that, in case of wastewater inlet into the reservoir of sand trap of larger cross-section, their flow rate decreases and thus heavier pollutant particles settle on the bottom of the sand trap. Pollutants that settle in sand traps are periodically discharged. Sand traps in the technological chain of wastewater treatment are usually built after grating, before primary settling tanks. Aerated sand traps (AS):
1. AS – 1, efficiency up to 10m3/h; 2. AS – 2, efficiency up to 30m3/h.
Oro padavimas- žarna Ø19 mm, 60 l/min.
Žem÷s paviršius
MECHANINIS NUOTEK
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Air supply – hose Ø19mm, 60l/min.
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H* Designed measurement 1 Body 2 Decorative riser with a lid 3 Pump guide 4 Aerator 5 Sand discharging pump 6 Anchoring ears 7 Pump uplift chain 8 Sand collection box
Aerated sand trap is the sand trap modification, where rotation of the treated wastewater flow is initiated with compressed air. It can be also used to eliminate floating particles. Wastewater flow motion is initiated by feeding compressed air into the aerated sand trap. Heavier silt moving in the flow – sand, gravel, etc. moves faster in the flow, friction into one another and other particles, lightweight, organic particles of wastewater silt separate from them; then, sand is rinsed. Rinsed sand settles on the bottom of the aerated sand trap and, with the help of the pump, accumulated sand is discharged into the dewatering equipment (a sandbox or sand separators).
Advantages of the aerated sand trap:
• sand in aerated sand traps is separated from organic silt that has a lower abrasive impact to the following equipment of wastewater treatment processes, reduces their wear;
• no need for special equipment to rinse the separated sand; • sand eliminated from aerated sand traps contains less decomposing organic silt; it is cleaner,
thus, it is more suitable for usage and discharge.
H* Designed measurement 1 Decorative service lid 2 A-2 chain 3 Body 4 Inlet pipe 5 Flow distribution belt 6 PE pipe 7 Anchoring ears 8 Sand discharging pump 9 Sand discharge line 10 Aerator 11 Air supply 12 Outlet pipe 13 Plastic bend 14 Sand box cover 15 Flow reduction chimney 16 Oulet pipe
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SAND SEPARATORS Purpose Sand separators eliminate sand and dirt from wastewater. They can be used in industrial companies, paper mills, slaughterhouses, food processing companies, companies processing natural resources, etc. for processing of wastewater flow or for treatment and for protection of mechanical equipment after them, and for increase of efficiency and reliability of the entire wastewater system. Sand separators are constructed from a hopper and a screw conveyor without a shaft. Wastewater flows into the hopper, where sand and dirt settle. Settled minerals and deposit are transferred and dewatered prior to discharge into the container.
Sand separator
Operation Liquid or wastewater, accumulated during the process, is let-out into the hopper at the top of it. Regarding the rate of settlement of particles, sand and dirt, present in wastewater, settle in case of appropriate retention. In this way, > 80% of sand particles of 0.20mm (200µm) size is retained. Floating solid materials and retained organic materials shall be collected together with wastewater and drained into the outlet pipe, and the collected sand, dirt and sediment shall be uplifted from water by a screw-conveyor and dewatered before discharging.
