Ara E, Sartaj M, Kennedy K
Civil Engineering, University of Ottawa, ON, Canada
Civil Engineering, University of Ottawa, ON, Canada.
Waste Manag Res. 2014 Dec;32(12):1200-9. doi: 10.1177/0734242X14554641. Epub 2014 Nov 14.
Anaerobic co-digestion of organic fraction of municipal solid waste, with thickened waste activated sludge and primary sludge has the potential to enhance biodegradation of solid waste, increase longevity of existing landfills and lead to more sustainable development by improving waste to energy production. This study reports on mesophilic batch and continuous studies using different concentrations and combinations (ratios) of organic fraction of municipal solid waste, thickened waste activated sludge (microwave pre-treated and untreated) and primary sludge to assess the potential for improved biodegradability and specific biogas production. Improvements in specific biogas production for batch assays, with concomitant improvements in total chemical oxygen demand and volatile solid removal, were obtained with organic fraction of municipal solid waste:thickened waste activated sludge:primary sludge mixtures at a ratio of 50:25:25 (with and without thickened waste activated sludge microwave pre-treatment). This combination was used for continuous digester studies. At 15 d hydraulic retention times, the co-digestion of organic fraction of municipal solid waste:organic fraction of municipal solid waste:primary sludge and organic fraction of municipal solid waste:thickened waste activated sludge microwave:primary sludge resulted in a 1.38- and 1.46-fold increase in biogas production and concomitant waste stabilisation when compared with thickened waste activated sludge:primary sludge (50:50) and thickened waste activated sludge microwave:primary sludge (50:50) digestion at the same hydraulic retention times and volumetric volatile solid loading rate, respectively. The digestion of organic fraction of municipal solid waste with primary sludge and thickened waste activated sludge provides beneficial effects that could be implemented at municipal wastewater treatment plants that are operating at loading rates of less than design capacity.
城市固体废弃物有机组分与浓缩剩余活性污泥及初沉污泥进行厌氧共消化，有增强固体废弃物生物降解、延长现有填埋场使用寿命并通过提高废弃物能源生产实现更可持续发展的潜力。本研究报告了中温批次和连续研究，使用不同浓度及组合（比例）的城市固体废弃物有机组分、浓缩剩余活性污泥（微波预处理和未处理）及初沉污泥，以评估提高生物降解性和特定沼气产量的潜力。对于批次试验，当城市固体废弃物有机组分：浓缩剩余活性污泥：初沉污泥的混合比例为50:25:25时（有和没有浓缩剩余活性污泥微波预处理），特定沼气产量有所提高，同时总化学需氧量和挥发性固体去除率也得到改善。该组合用于连续消化器研究。在水力停留时间为15天的情况下，与相同水力停留时间和容积挥发性固体负荷率下的浓缩剩余活性污泥：初沉污泥（50:50）及浓缩剩余活性污泥微波：初沉污泥（50:50）消化相比，城市固体废弃物有机组分：城市固体废弃物有机组分：初沉污泥以及城市固体废弃物有机组分：浓缩剩余活性污泥微波：初沉污泥的共消化分别使沼气产量提高了1.38倍和1.46倍，并伴随废弃物稳定化。城市固体废弃物有机组分与初沉污泥及浓缩剩余活性污泥的消化产生了有益效果，这些效果可在运行负荷低于设计容量的城市污水处理厂实施。
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