Renewable Energy Potential of Sewage in Zambia

• 作者: Aubrey Simwambi Francis Yamba Kabwe Mulenga Sophia Hibler
• 来源期刊: 应用科学(英文)
• 学科: 地球科学
• 关键词: BIOGAS METHANE RENEWABLE COD Levelized
• 年，卷（期）: 2020,（6）
• 页码范围: 328-350
• 页数: 23页
• 分类号: X70

摘要

<span style="font-family:Verdana;">This study was aimed at investigating the renewable energy potential of com</span><span style="font-family:Verdana;">- </span><span style="font-family:""><span style="font-family:Verdana;">munal and municipal wastewater through methane production in biogas digesters and the use of the captured methane for energy production in biogas </span><span style="font-family:Verdana;">engines. It was conducted on biogas digesters receiving and pre-treating</span><span style="font-family:Verdana;"> communal and municipal wastewater in the Zambian city of Livingstone. Wastewater inflow rates into biogas units including the wastewater turbidity, total dissolved solids (TDS), temperature, pH, conductivity and Chemical Oxygen Demand (COD) were measured during the study. And all the produced biogas was measured and combusted on-site during the course of the research. In order to know the methane content of the gas, the CO</span>_{<span style="font-family:Verdana;">2</span>}<span style="font-family:Verdana;"> content in the biogas was measured with a CO</span>_{<span style="font-family:Verdana;">2</span>}<span style="font-family:Verdana;"> indicator. The study showed that the predominant factor affecting the process of methane production from wastewater to the greatest extent is the COD concentration of the inflowing wastewater and not the system hydraulic retention times (HRT’s). The COD treatment levels of the tested systems ranged between 27 and 86 percent and the degree of </span><span style="font-family:Verdana;">breakdown primarily depended on the COD concentration of the influent</span><span style="font-family:Verdana;"> wastewater. On renewable energy fuel production, about 3.54 kilograms of COD in each system produced a kilogram of methane. Communal wastewater was able to produce an average of 600 grams of methane per cubic meter of wastewater treated whilst municipal wastewater with less COD concentration was only able to produce about 64.5 grams of methane per cubic m