Anaerobic Digestion of Oxidation Ditch Sludge at Low Temperatures with Hyperthermophilic Pretreatment
Anaerobic Digestion of Oxidation Ditch Sludge at Low Temperatures with Hyperthermophilic Pretreatment
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DOI：
10.2965/jwet.18-041
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发表时间：
2019
影响因子：
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通讯作者：
S. Tamaki;T. Hidaka;T. Mizuno;Yasunari Kusuda;F. Nishimura
中科院分区：
文献类型：
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作者：
S. Tamaki;T. Hidaka;T. Mizuno;Yasunari Kusuda;F. Nishimura
集中厌氧消化小型污水处理厂脱水污泥和其他垃圾生物质如厨余垃圾是一种很有前途的能源回收技术。低温厌氧消化可降低操作成本，而超嗜热预处理可提高厌氧消化性能。通过连续试验和间歇试验，研究了氧化沟脱水污泥在不同温度条件下对厌氧消化的适应性。脱水后的污水污泥在投料前稀释至总固体含量5%。当有机负荷率为0.94 kg挥发性固体(VS)/（m3·d）时，在中温条件下（35°C）脱水污泥的沼气产量为0.20 NL/ gvs。在25、30和35℃厌氧消化条件下，80℃超热预处理24 h，产气量均高于0.20 NL/ gvs -添加。揭示了不同温度对消化特性和微生物群落的影响。经预处理的消化污泥的氨浓度高于未经预处理的消化污泥。结果表明，预处理与亲湿厌氧消化相结合的处理方法适用于小型设施分散的地方城市污泥管理。
Centralized anaerobic digestion of dewatered sludge from small scale wastewater treatment plants and other waste biomass such as kitchen garbage is a promising energy recovery technology. Anaerobic digestion at lower temperatures reduces operational cost, while hyperthermophilic pretreatment upgrades anaerobic digestion performance. The applicability of dewatered sewage sludge from an oxidation ditch process to anaerobic digestion was investigated by continuous and batch experiments under combined different temperature conditions. Dewatered sewage sludge was diluted to total solids 5% before feeding. When the organic loading rate was 0.94 kg volatile solids (VS)/(m 3 ·d), biogas production from dewatered sewage sludge at a mesophilic condition (35°C) was 0.20 NL/gVS-added. Under anaerobic digestion conditions at 25, 30 and 35°C with hyperthermophilic pretreatment at 80°C for 24 h, biogas production was higher than 0.20 NL/gVS-added. Effect of different temperatures on digestate characteristics and microbial communities were revealed. An ammonia concentration of the digested sludge with pretreatment was higher than that of the digested sludge without pretreatment. These results proved that the combination of pretreatment and psychrophilic anaerobic digestion is applicable for sludge management in local cities with decentralized small facilities.