Bioenergy Potentials of Garden/Organic Waste in

the City of Johannesburg

Samson Masebinu | 5th July 2018

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Scope of Study

•Identify, quantify and characterize the waste resource from JM, Pikitup Dailies

and Round Collected Refuse

•Identify high value utilization strategies and off-takers for generated biogas

•Techno-economic study of various process options and conversion paths for

converting the targeted waste stream to enriched biogas

•Techno-economic study to determine optimal and most sustainable utilization

of enriched biogas produced at various scale

•Business plan on utilization of OFMSW for the production of biomethane, for

use in high value application such as mobility

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Introduction• Organic waste can be converted into useful energy that can power ICE

• Anaerobic digestion involves the breakdown of organic materials in the absence of oxygen

• Biogas = CH4+CO2+trace gases, is produced

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Waste Characterisation – Round Collected Refuse

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Waste Characterisation – Joburg Market

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Waste Characterisation – Joburg Market

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Summarised Waste Composition

Waste group RCR Dailies JFPM

Organics 33.98% 14.45% 93%

Paper 11.73% 17.03% 3.08%

Plastic 18.86% 33.95% 1.19%

Glass 8.62% 9.00% 0%

Metals 5.38% 8.68% 0.43%

Fabric & leather 3.12% 7.48% 0%

Special

Care/hazardous2.21% 1.20% 0%

Health Care 6.38% 1.97% 0%

Misc. Combustible 4.56% 0.18% 0.58%

Misc. Non-

combustible5.16% 6.06% 0.14% (others)

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Waste Generation Heat Map in CoJ

Income group Minimum Maximum Average Recent

study

High income 1.01 2.78 1.91 1.03-2.20

Middle income 0.67 1.48 1.01 0.83-1.04

Low Income 0.52 1.39 0.92 0.75-0.99

Income group Minimum Maximum Average

High income 299,443 824,262 566,826

Middle income 306,839 681,304 463,444

Low income 451,509 1,197,033 795,208

Ton/year 1,057,791 2,702,601 1,825,479

Waste Generation per Capita in CoJ

(kg/person/day)

Waste Generation in CoJ (Ton/year)

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Waste Flow Analysis within CoJ

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Waste Generation Profile of Joburg Market

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Potential of Organic Waste

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Conversion of Joburg FVW into Energy

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Pathways for utilization of biogas from FVW from Joburg Market

Pathway 1 Pathway 2 Pathway 3

Biogas Production 1,605,455 1,605,455 1,605,455

Electrical Demand Energy 614,901 kWh/y 1,207,421 kWh/y 1,207,421 kWh/y

Thermal Demand Energy 780,735 kWh/y 861,008 kWh/y 833,566 kWh/y

Installed CHP 430 kW - 160 kW

Product Potential

Electricity 3,369,529 kWh/y - 1,280,000 kWh/y

Biomethane - 900,288 Nm3/y 599,246 Nm3/y

Compost 5,914 tonnes/y 5,914 tonnes/y 5,914 tonnes/y

Excess Thermal Energy

(kWh/yr)

2,715,143 kWh/y - 388,948 kWh/y

CO2 avoided (tCO2eq) 9,833 12,393 12,513

Pathway 1 Pathway 2 Pathway 3

TPC $2,928,223 $3,574,337 $3,557,594

CAPEX $3,294,250 $4,021,129 $4,002,293

NPV $1,262,549 $2,428,021 $1,208,509

IRR 14.30% 16.90% 13.61%

Simple Payback 7.42 y 6.17 y 7.44 y

Discounted Payback 11.76 y 8.87 y 11.96 y

The Bigger Picture of Organic Waste Potential in CoJ

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Biomethane Potential from identified organic waste sources

Total Biomethane potential from all organics within the City of Johannesburg = 91.6 Million Nm3/year

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Overview of feasibility indicators and assessment for the CoJ

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Some Reports & Publications

Thank You