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Evaluation of energy recovery potential in wastewater treatment based on codigestion and combined heat and power schemes

机译：基于Codigestion和Comploct Meatue和Power Supems的废水处理中能量回收潜力评估

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摘要

The future goal for wastewater treatment industry is to transform existing wastewater treatment plants (WWTPs) into water and energy recovery facilities (WERFs). The first step to reach this goal is to achieve energy-neutral or energy-positive status in its operations. This research study develops a systematic quantitative analysis to assess the performance of different wastewater treatment scenarios. The effects of the influent wastewater strength (or concentration), plant capacity, primary treatment efficiency, and different supplemental feedstock have been evaluated to assess the potential for energy recovery in WTTPs. Further, energy performance of the WWTP is optimized using different combined heat and power (CHP) schemes. For the first time, a quantitative mass and energy balance methodology was used to evaluate carbon and energy balance and combined heat and power system optimization. Increasing the primary treatment efficiency, process equipment upgrades, and use of supplemental biodegradable organic waste are identified as influential factors. Increasing the removal of chemical oxygen demand (COD) by 10% in primary treatment resulted in an estimated reduction in total energy requirement by 8.5% and increased recoverable energy by 8.8%. This result illustrates that influent wastewater COD strength and the plant capacity may have significant impact on the energy recovery potential. Energy production from a WERF can be enhanced by codigesting sewage sludge with highly biodegradable organic waste. Further analysis shows that specifying an appropriate CHP engine is integral in minimizing the energy losses.
机译：污水处理行业的未来目标是将现有的废水处理厂（WWTPS）转化为水和能源回收设施（WERF）。达到这一目标的第一步是在其运营中实现能量中性或能量阳性地位。该研究研究发展了系统的定量分析，以评估不同废水处理场景的性能。已经评估了影响废水强度（或浓度），植物容量，初级处理效率和不同补充原料的影响，以评估WTTPS中能量回收的潜力。此外，使用不同的组合热量和功率（CHP）方案来优化WWTP的能量性能。首次，定量质量和能量平衡方法用于评估碳和能量平衡以及组合的热量和电力系统优化。增加初级治疗效率，过程设备升级和补充可生物降解的有机废物的使用被确定为影响因素。提高初级处理中的化学需氧量（COD）的除去10％导致总能量需求的估计降低8.5％，并将可收回的能量增加8.8％。该结果说明了影响的废水COD强度和植物能力可能对能量恢复电位产生显着影响。通过具有高可生物降解的有机废物的污水污泥可以增强来自WERF的能量生产。进一步的分析表明，指定适当的CHP发动机在最小化能量损失时是一体的。

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