壳聚糖和溶菌酶联用对污泥脱水性能的影响
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摘要
通过对污泥比阻、泥饼含水率、沉降性能和絮体形态等指标的观测,考察了壳聚糖和溶菌酶联用对活性污泥脱水性能的影响。结果表明,壳聚糖和溶菌酶联用时,以先投加壳聚糖后投加溶菌酶的联用效果最好;壳聚糖和溶菌酶的最佳投加量分别为0.01和0.10 g/g TS,在此条件下,与壳聚糖单独调理相比,联用调理可将泥饼含水率进一步降低约7%,比阻降低约20%。通过对比调理前后的污泥显微照片和二维分形维数发现,联用调理后的污泥絮体变得大而密实,表面和内部结合水被释放,从而有效提高了污泥的脱水性能。
The effect of chitosan and lysozyme treatment on sludge dewaterability were evaluated through measurement of specific resistance to filtration( SRF),moisture content of cake,settleability and identification of floc morphological change. The results indicated that when chitosan and lysozyme were simultaneously used,the dewaterability of sludge pretreated by chitosan first and then by lysozyme was better than that of sludge treated by lysozyme first. The best dosages of chitosan and lysozyme were 0. 01 g/g TS and 0. 10 g/g TS respectively,which resulted in that the moisture content of cake and SRF decreased by 7% and 20% respectively compared with the sludge treated by chitosan alone. Microscopy and fractal dimension analysis showed that the structure of the sludge floc became larger and compacter after treated by chitosan and lysozyme together,and the external and internal bound water were released.Thus the sludge dewaterability was improved effectively.
The effect of chitosan and lysozyme treatment on sludge dewaterability were evaluated through measurement of specific resistance to filtration( SRF),moisture content of cake,settleability and identification of floc morphological change. The results indicated that when chitosan and lysozyme were simultaneously used,the dewaterability of sludge pretreated by chitosan first and then by lysozyme was better than that of sludge treated by lysozyme first. The best dosages of chitosan and lysozyme were 0. 01 g/g TS and 0. 10 g/g TS respectively,which resulted in that the moisture content of cake and SRF decreased by 7% and 20% respectively compared with the sludge treated by chitosan alone. Microscopy and fractal dimension analysis showed that the structure of the sludge floc became larger and compacter after treated by chitosan and lysozyme together,and the external and internal bound water were released.Thus the sludge dewaterability was improved effectively.
引文
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[2]徐玉龙.胞外酶在污泥水解中的运用研究[J].环境科学与技术,2009,32(B12):197-200.
[3]Dursun D,Turkmen M,Abu-Orf M,et al.Enhanced sludge conditioning by enzyme pre-treatment:comparison of laboratory and pilot scale dewatering results[J].Water Sci Technol,2006,54(5):33-41.
[4]Ayol A.Enzymatic treatment effects on dewaterability of anaerobically digested biosolids-Ⅰ:performance evaluations[J].Process Biochem,2005,40(7):2427-2434.
[5]陈伟,贾原媛,郑伟,等.胞外多聚物对酶催化污泥厌氧水解的影响研究[J].环境科学,2011,32(8):2334-2339.
[6]李欣,蔡伟民.污泥调理剂与有机高分子絮凝剂联合作用对污泥脱水性能影响的研究[J].净水技术,2009,28(3):40-44.
[7]谢敏.净水厂排泥水浓缩脱水特性及调质形态学研究[D].长沙:湖南大学,2007.
[8]Wang Y L,Dieude-Fauvel E,Dentel S K.Physical characteristics of conditioned anaerobic digested sludge-A fractal,transient and dynamic rheological viewpoint[J].J Environ Sci,2011,23(8):1266-1273.
[9]柳海波,张惠灵,范凉娟,等.投加调理剂和表面活性剂对污泥脱水性能的影响[J].中国给水排水,2012,28(3):10-14.
[10]李圭白,张杰.水质工程学[M].北京:中国建筑工业出版社,2005.