CENT W LEHI W Depa TRAL CA WASTEW IGHTON, WASTEWA Marc artment of En Ra 400 M ARBON WATER T CARBON NPDES ATER TR APRIL Pre c Neville | W nvironmenta achel Carson Market Stree P: 7 mnev MUNIC TREATM N COUNT # PA006 REATMEN L - MAY 201 epared by: Water Progra al Protection n State Offic et, Harrisbur 17.772.4019 v[email protected]v IPAL AU MENT FA TY, PENN 3711 NT EVALU 17 am Specialis – Bureau of ce Building rg, PA 1710 9 v UTHORIT ACILITY NSYLVAN UATION t f Clean Wate 01 TY IA er
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Page 1
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Treatment Eval
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Page 2
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Treatment Eval
Bureau of Clean
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Central Carbon Municipal Authority Wastewater Treatment Evaluation
PA Dept. of Environmental Protection Page 3 Bureau of Clean Water
4. Continue to explore energy efficiency opportunities throughout the facility. A significant energy saving project was identified, about $6k/year, which could provide a funding stream for alkalinity chemicals.
Wastewater Treatment Evaluation: DEP’s Wastewater Technical Assistance Program (WWTAP) offers a wastewater treatment evaluation (WTE) that comprises round-the-clock monitoring of key treatment parameters with laboratory and practical experiences in order to optimize effluent quality, often above permit requirements, by making process changes that do not typically involve capital projects. The WTE may be thought of as a custom-tailored trouble-shooting and comprehensive site inspection that aims to solve common wastewater treatment problems through interaction with licensed wastewater treatment operators. DEP operates this program as part of a federal grant to reduce nutrient pollution in waters of the United States. The CCMA facility is permitted for up to 1.6 MGD annual average flow with an organic capacity of 2,936 lb/day as BOD5. Treatment includes a Kruger Process triple oxidation ditch that provides secondary activated sludge treatment with clarification and includes a main pumping station, fine-screening and grit-removal headworks, ultraviolet (UV) disinfection, and effluent freshening operated under NPDES Permit # PA0063711. The facility presently monitors and reports nutrients, including nitrite-nitrate, ammonia nitrogen, total Kjeldahl nitrogen (TKN), and total phosphorus. Since 2014, the facility also monitors its effluent on a quarterly basis for copper, zinc, aluminum, iron, and manganese. Solids management processes include sludge thickening, aerobic digestion, decanting, and disposal to 38,400 s.f. of reed beds or alternative disposal to the Hazleton Sewer Authority Solids Management Program. Chemical addition includes provision for Lime addition as process alkalinity enhancement, but it is not presently used. In the past, polymer flocculants have been used to assist in sludge settling. The evaluation took place without the use of Kruger Process programming for a denitrification phase, whereby subsurface anoxic mixing would occur. Instead, the facility operator extended the idle time for the aeration brush rotors while continuing to provide raw wastewater as a carbon source. The resultant reduction in effluent nitrate was effective, considering this modified intermittent “ON/OFF” aeration approach. Lime addition was not provided. Following this evaluation, the facility operator has also considered employing intermittent aeration at the aerobic digesters; however, the SCADA programming would not permit the use of analog timing devices to control aeration there. Equipment was deployed on April 20, 2017, following initial consultation with US EPA Outreach Staff and with the Superintendent of the CCMA facility. CCMA had recently become interested in an un-used feature of the Kruger Process oxidation ditches’ SCADA program that would optimize effluent quality. The illustration below shows the triple-ditch phasing sequences for BNR at this facility. Prior to this WTE, the facility had no overriding concerns to add denitrification to its treatment, although the NPDES permit renewal in 2014 began requiring “monitor and report” values for nutrients, without actual loading limits. The phasing diagram shows denitrification in dark blue, nitrification in cyan, and clarification in white:
Central Ca
PA Dept. of
SuspendBiochemnitrate-niultravioleAttachmethence toremote, fchecking During thfacility wadetectabconcentrtypically already psystem; hCCMA whowevermanagedmixed liqfollowed At the en
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Treatment Eval
Bureau of Clean
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Central Carbon Municipal Authority Wastewater Treatment Evaluation
PA Dept. of Environmental Protection Page A-1 Bureau of Clean Water
ATTACHMENT A: PROJECT TEAM --for the Central Carbon Municipal Authority --for PA DEP Michael Takerer, Superintendent CCMA Wastewater Treatment Facility 1000 Lehigh Drive Lehighton, PA 18235-2239 tel. 570-778-3093 eml. [email protected]
Marc Neville, WPS Bureau of Clean Water Wastewater Technical Assistance Program POB 8774 Harrisburg, PA 17105 tel. 717-772-4019 eml. [email protected]
--for US EPA Region III Walter Higgins EPA Region III Water Protection Division Office of Infrastructure and Assistance (3WP50) 1650 Arch Street Philadelphia, PA 19103-2029 tel. 215-814-5476 eml. [email protected]
Britney Vazquez EPA Region III Water Protection Division Office of Infrastructure and Assistance (3WP50) 1650 Arch Street Philadelphia, PA 19103-2029 tel. 215-814-5476 eml. [email protected]
Central Ca
PA Dept. of
Figure 1
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PA Dept. of
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dation Ditch..
Wastewater TTreatment Eval
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Central Ca
PA Dept. of
Graph 1: NH3‐N cou
Graph 2:
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Page C-1
ARAMETER
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Treatment Eval
Bureau of Clean
g/L range, wh
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Central Ca
PA Dept. of
Graph 3:
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Page C-2
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PA Dept. of
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Page C-3
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Treatment Eval
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Central Ca
PA Dept. of
Photo 1:
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ATTACHM
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Page D-1
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Central Carbon Municipal Authority Wastewater Treatment Evaluation
PA Dept. of Environmental Protection Page E-1 Bureau of Clean Water
ATTACHMENT E: OBSERVATIONS & FIELD NOTES In-line Probe Records
1. Aerators in the ditches are automatically controlled by DO set points (1.5-3.5 ppm) 2. The NO3-N concentration dropped approximately 75% when the plant was in BNR
mode. Further reduction should be possible if the alkalinity concentration is improved. 3. pH increased slightly (+0.3) in each ditch due to additional denitrification during the
manually-controlled anoxic mixing period; however, the mixed liquor is generally deficient in alkalinity
4. Oxidation/Reduction Potential observations: a. Nitrification occurs in aerobic conditions above +150 mV, after most carbon
waste has been oxidized. Denitrification occurs in anoxic conditions between +150 and -150 mv. Below -150 mV, septicity and anaerobic conditions produce incomplete by-products such as alcohols, organic acids, ketones, and esters. Sulfate is reduced to hydrogen sulfide gas.
b. Prior to implementation of the anoxic treatment cycle, Ditch #1 ranged between 0 to +200 mV and Ditch #3 ranged between -50 to +150 mV for the first two weeks.
c. During anoxic mixing, Ditch #1 ranged between -100 to +150 mV and Ditch #3 ranged between -200 to +100 mV for the remainder of the study.
Digester and Sludge Thickening
EPA staff suggested cycling the digester blowers intermittently in an attempt to remove TN, increase pH, and improve settleability. DEP and facility staff installed a timer to cycle the blower, but when the blower was timed off an alarm was triggered in the SCADA. Facility staff will have the SCADA contractor add a timed anoxic cycle to the SCADA programming instead of using a mechanical timer, so that energy savings may be optimized.
Conclusions The plant appears to be capable of consistently producing effluent to meet the potential 10 mg/l limit of TN (especially if the mixers are activated). Timing digester blowers may save approximately $6k/yr.
50 HP brush rotor motor x 50% load x 0.746 kW/HP x $0.07/kWh x 12 hr/day x 365 day/yr = $5,718/yr
Analysis of lab data: Microscopy:
During the week of May 15 there was a decrease in settleability and increase in what we assume to be low F:M filaments in one of the outer ditches. In response, facility staff changed the phase schedule of the ditches. This changes the organic and hydraulic loading schedule in an attempt to evenly distribute the loading between the two outer ditches in order to maintain a steady state for the biomass. If the programming can be changed to have an odd number of phases per day instead of the present even number of phases per day, there may not be a need to flip the ditches as often.
Oxygen Uptake Rate (OUR) Test:
CCMA operates a fully competent process monitoring laboratory with dedicated laboratory staff. DEP finds that the process monitoring is adequate for operation of the facility, but DEP staff recommended that the laboratory routine be supplemented by
Central Ca
PA Dept. of
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Page E-2
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Treatment Eval
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