剩余污泥蒸汽爆破处理工艺优化
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摘要
以溶解性COD(SCOD)为指标,对剩余污泥蒸汽爆破(汽爆)处理工艺进行优化研究。基于单因素试验,采用响应面法确定了汽爆处理最优工艺条件:汽爆压力1.50 MPa,维压时间245 s,污泥含水率40%。在此条件下,SCOD实际测定值为(71.86±1.15) g/kg,与未蒸汽爆破污泥样品相比,SCOD提高了482.33%。SCOD响应面分析模型预测值为72.25 g/kg,模型预测值与实际测定值接近,建立的模型具有实际指导意义。
The optimization research on the steam explosion treatmen t process of waste activated sludge has been implemented,using soluble COD(SCOD) as an index. Based on single factor tests,the optimal process conditions of steam explosion treatment have been ascertained by response surface method,as follows:steam explosion pressure1.50 MPa,dwell time 245 s,and sludge water content rate 40%. Under these conditions,the actual measured value of SCOD is(71.86±1.15) g/kg. Compared with the sludge sample which was not subjected to steam explosion,its SCOD is improved by 482.33%. The predicted value of SCOD response surface analysis model is 72.25 g/kg,the predicted value of the model is close to the actual measured value,indicating that the established model has practical and guiding significance.
The optimization research on the steam explosion treatmen t process of waste activated sludge has been implemented,using soluble COD(SCOD) as an index. Based on single factor tests,the optimal process conditions of steam explosion treatment have been ascertained by response surface method,as follows:steam explosion pressure1.50 MPa,dwell time 245 s,and sludge water content rate 40%. Under these conditions,the actual measured value of SCOD is(71.86±1.15) g/kg. Compared with the sludge sample which was not subjected to steam explosion,its SCOD is improved by 482.33%. The predicted value of SCOD response surface analysis model is 72.25 g/kg,the predicted value of the model is close to the actual measured value,indicating that the established model has practical and guiding significance.
引文
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[4]姚萌,罗红元,谢小青,等.城市污水厂活性污泥胞外聚合物的三维荧光特性分析[J].中国环境科学,2012,32(1):94-99.
[5]郝晓地,张璇蕾,刘然彬,等.剩余污泥转化能源的瓶颈与突破技术[J].中国给水排水,2014,30(18):1-7.
[6]Zhen Guangyin,Lu Xueqin,Kato H,et al. Overview of pretreatment strategies for enhancing sewage sludge disintegration and subsequent anaerobic digestion:Current advances,full scale application and future perspectives[J]. Renewable and Sustainable Energy Reviews,2017,69:559-577.
[7]Wang Jie,Li Yongmei. Synergistic pretreatment of waste activated sludge using Ca O2in combination with microwave irradiation to enhance methane production during anaerobic digestion[J]. Applied Energy,2016,183:1123-1132.
[8]何楚茵,金辉,淳炜,等.臭氧处理剩余污泥的减量化实验研究[J].环境工程学报,2012,6(11):4228-4234.
[9]Joginder S,Meenakshi S,Anil D. Augmented digestion of lignocellulose by steam explosion,acid and alkaline pretreatment methods:A review[J]. Carbohydrate Polymers,2015,117:624-631.
[10]Zhao Peitao,Ge Shifu,Yoshikawa K. An orthogonal experimental study on solid fuel production from sewage sludge by employing steam explosion[J]. Applied Energy,2013,112(16):1213-1221.
[11]刘越,尹小波,李强,等.蒸汽爆破对脱水污泥溶解性和厌氧消化性能的影响[J].环境工程学报,2014,8(12):5469-5473.
[12]Li Hongqiang,Chen Hongzhang. Detoxification of steam-exploded corn straw produced by an industrial-scale reactor[J]. Process Biochemistry,2008,43(12):1447-1451.
[13]韩鹏,刘和,丁春华,等.蒸汽爆破对城市污泥预处理和厌氧发酵产酸的影响[J].中国环境科学,2017,37(1):238-244.
[14]王忠科,陆江银,王建俊.响应面法优化污泥-花生壳共热解工艺条件[J].环境工程学报,2017,11(10):5663-5670.
[15]贺磊,龚志豪,朱旺平,等.响应面法优化臭氧催化氧化深度处理垃圾渗滤液[J].工业水处理,2018,38(6):46-50.