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The influence of temperature and SRT on high-solid digestion of municipal sewage sludge

机译:温度和SRT对城市污水污泥高固相消化的影响

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The influence of temperature and solids retention time (SRT) on high-solid digestion of municipal sewage sludge was investigated in laboratory-scale reactors. Digestion with high-solid concentration reduces the required digestion volume and is advantageous for urban areas. The experimental conditions comprised total suspended solids (TSS) in digested sludge between 4.0 and 4.6%, temperatures in a range of 33 to 41 degrees C and the SRT between 10 and 25 d. High-solid digestion operates with increased NH4-N concentrations released from organic compounds. The anaerobic process can be limited by high NH4-N concentration and toxic NH3. In this study a stable digestion was observed up to 2,000 mg L (-1) NH4-N and 75 mg L (-1) NH3. Volatile suspended solids (VSS) and chemical oxygen demand removal was 53% and 57% respectively. However, digestion with 10 d SRT led to a declined VSS removal of 49%. The removal at 41 and 37 degrees C showed minor differences, while reduced NH4-N release and reduced methane production were observed at 33 degrees C. For economic reasons, high-solid digestion at 41 degrees C is not recommended, but will not impair VSS removal. The outcomes of this study confirm that digestion with up to 7.8% TSS in the feed is feasible for the tested temperatures and SRT down to 15 d.
机译:在实验室规模的反应器中,研究了温度和固体保留时间(SRT)对城市污水污泥高固体消化的影响。高固含量的消化减少了所需的消化量,对市区有利。实验条件包括消化污泥中的总悬浮固体(TSS)在4.0和4.6%之间,温度在33到41摄氏度之间以及SRT在10到25天之间。高固体分消化通过增加有机化合物释放的NH4-N浓度来进行。厌氧过程可能受到高浓度NH4-N和有毒NH3的限制。在这项研究中,观察到稳定的消化,最高可达2,000 mg L(-1)NH4-N和75 mg L(-1)NH3。挥发性悬浮物(VSS)和化学需氧量去除分别为53%和57%。但是,用10 d SRT消化会导致VSS去除率下降49%。在41和37摄氏度下的去除率显示出微小差异,而在33摄氏度下观察到的NH4-N释放减少和甲烷生成减少。出于经济原因,不建议在41摄氏度下进行高固相消化,但这不会损害VSS。去除。这项研究的结果证实,在测试温度和低至15 d的SRT下,饲料中最高7.8%的TSS消化是可行的。

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