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Low Cost Plug-Flow Thermophilic Batch Digestion Process that Achieves Class A EQ Biosolids Standards Without Mixing and Grit Accumulation

机译:低成本推流式高温分批消化工艺,无需混合和粗砂积累即可达到AQ EQ生物固体标准

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In order to produce Class A biosolids, the Oceanside Water Pollution Control Plant retrofitted its original four mesophilic anaerobic digesters into a Temperature Phased Anaerobic Digestion (TPAD) process between 2014 and 2016. At the same time the plant staff worked on addressing long term anaerobic digestion operational challenges. The initial design led to significant improvements in digestion foam monitoring and control. However, operation of the new process was challenged by grit accumulation and the system was not able to consistently produce Class A biosolids. The grit accumulation issue was later resolved by modifying the sludge recirculation patterns while not operating the mixing pump and by eliminating the use of the original dewatering feed tank. The grit does not accumulate in the system as before and there is no more need for routine cleanup. This results in a plug-flow thermophilic batch digester process capable of reliably producing Class A biosolids at a relatively low operation and maintenance cost. The new process also resulted in a 30% increase in biogas production. This paper presents the approach to develop this novel anaerobic digestion process.
机译:为了生产A类生物固体,Oceanside水污染控制厂在2014年至2016年之间将其最初的四个中温厌氧消化池改造为温度分阶段厌氧消化(TPAD)工艺。与此同时,工厂员工致力于解决长期厌氧消化问题。操作上的挑战。最初的设计大大改善了消解泡沫的监测和控制。然而,新工艺的操作受到砂砾积聚的挑战,该系统无法始终如一地生产A类生物固体。后来,通过在不操作混合泵的情况下修改污泥的再循环方式并消除了原来的脱水进料罐的使用,解决了积砂问题。砂粒不会像以前那样在系统中堆积,也不再需要常规清理。这导致了能够以相对较低的运行和维护成本可靠地生产A类生物固体的推流式高温间歇式消化器工艺。新工艺还使沼气产量增加了30%。本文介绍了开发这种新型厌氧消化过程的方法。

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