不同调理方法强化污水厂污泥脱水性能的对比
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摘要
以上海某生活污水厂浓缩污泥为研究对象,以泥饼含水率和毛细吸水时间(CST)为评价指标,系统对比研究了芬顿(Fenton)、超声波-聚合硫酸铁(PFS)、十二烷基磺酸钠(SDS)-氢氧化钠(NaOH)、溶菌酶和蛋白酶K共5种污泥调理方法对污泥脱水性能的强化效果。研究结果表明:5种调理方式中Fenton调理的脱水效果最好,调理后污泥泥饼含水率和CST分别为64.8%、43.3 s,但其产生的强酸性废水和污泥可能会影响后续的处理处置;技术经济综合分析发现,超声波-PFS联合调理是相对最优的污泥调理方式,超声波作用时间为30 s,PFS投加量为15.0 mg/g时,污泥的泥饼含水率可达到70.51%;蛋白酶K的调理效果明显优于溶菌酶;然而,研究发现SDS-NaOH联合调理会导致污泥脱水性能恶化。
The effects of Fenton conditioning, ultrasonic-polymerized ferrous sulfate(PFS) combined conditioning, sodium laurylsulfonate(SDS)-sodium hydroxide(NaOH) combined conditioning, lysozyme conditioning and protease K conditioning on the enhancement of dewaterability of concentrated sludge in a domestic wastewater treatment plant in Shanghai were systematically researched and compared, with the water content of the sludge cake and capillary suction time(CST) being used as the evaluation indexes. Research results showed that: among the five conditioning methods, the sludge dewaterability after Fenton conditioning was the best, with the water content of the sludge cake and CST being 64.8% and 43.3 s respetively after conditioning, whereas its strong acid wastewater and sludge may affect the subsequent treatment and disposal; ultrasonic-PFS combined conditioning was considered to be the relatively optimal sludge conditioning method upon comprehensive technical and economic analysis, and when the ultrasonic time was 30 s and PFS dosage was 15.0 mg/g, the water content of the sludge cake could reach 70.51%; protease K had better conditioning effect than lysozyme;however, SDS-NaOH combined conditioning weakened the sludge dewaterability.
The effects of Fenton conditioning, ultrasonic-polymerized ferrous sulfate(PFS) combined conditioning, sodium laurylsulfonate(SDS)-sodium hydroxide(NaOH) combined conditioning, lysozyme conditioning and protease K conditioning on the enhancement of dewaterability of concentrated sludge in a domestic wastewater treatment plant in Shanghai were systematically researched and compared, with the water content of the sludge cake and capillary suction time(CST) being used as the evaluation indexes. Research results showed that: among the five conditioning methods, the sludge dewaterability after Fenton conditioning was the best, with the water content of the sludge cake and CST being 64.8% and 43.3 s respetively after conditioning, whereas its strong acid wastewater and sludge may affect the subsequent treatment and disposal; ultrasonic-PFS combined conditioning was considered to be the relatively optimal sludge conditioning method upon comprehensive technical and economic analysis, and when the ultrasonic time was 30 s and PFS dosage was 15.0 mg/g, the water content of the sludge cake could reach 70.51%; protease K had better conditioning effect than lysozyme;however, SDS-NaOH combined conditioning weakened the sludge dewaterability.
引文
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[18] Mohajeri S,Aziz H A,Isa M H,et al. Statistical optimization of process parameters for landfill leachate treatment using electro-fenton technique[J].Journal of Hazardous Materials,2010,176(1/3):749-758.
[19] 寇成贵,崔丰元.聚合硫酸铁对污泥脱水性能研究[J].环境科学与管理,2015,40(3):67-70.
[20] 周翠红,凌鹰,曾萌,等.微波/超声波对污泥粒度与水分的影响[J].环境工程学报,2017,11(1):529-534.
[21] 周贞英.电化学预处理与表面活性剂联合调理对污泥脱水性能的影响[D].山西: 太原理工大学,2011.
[22] 洪晨,邢奕,王志强,等.不同pH下表面活性剂对污泥脱水性能的影响[J].浙江大学学报(工学版),2014,48(5):850-857.
[23] 袁园.表面活性剂及酸处理对污泥脱水性能影响的研究[D].上海: 同济大学,2003.
[24] Salton M R. The properties of lysozyme and its action on microorganisms[J].Bacteriological Reviews,1957,21(2):82-100.
[25] 施周,戴慧奇,罗璐,等.溶菌酶和硫酸铝联用优化污泥脱水性能的研究[J].安全与环境学报,2017,17(4):1392-1397.
[2] To V H P,Nguyen TV,Vigneswaran S,et al. A review on sludge dewatering indices[J]. Water Science and Technology,2016,74(1):1-16.
[3] 刘怡君.芬顿反应强化污泥脱水试验及机理研究[J].环境工程,2017,35(4):55-59.
[4] 罗安然,甄广印,龙吉生,等.Fenton预处理强化污泥脱水:胞外聚合物和黏度的特性研究[J].环境工程,2016,34(2):127-132.
[5] 韩青青,林雪君,李燕敏,等.超声波预处理城市水厂剩余污泥的研究[J].工业安全与环保,2016,42(10):96-99.
[6] 谢经良,李常芳,刘亮,等.超声波与氯化铁联用改善污泥脱水性能的研究[J].科技通报,2014,30(7):203-206.
[7] 申亮,施周,罗璐,等.壳聚糖和溶菌酶联用对污泥脱水性能的影响[J].中国给水排水,2016,32(5):127-131.
[8] Bonilla S,Tran H,Allen D G. Enhancing pulp and paper mill biosludge dewaterability using enzymes[J]. Water Research,2015,68:692-700.
[9] 祖叶品,刘宏波,符波,等.蛋白酶和EDTA-2Na协同作用对剩余污泥水解的影响[J].环境工程学报,2013,7(8):3158-3164.
[10] 沈蔚然,周俊,李想,等.不同调理剂对厌氧石化污泥脱水性能的影响研究[J].环境工程,2017,35(9):117-121.
[11] 郭俊元,赵净,付琳.水稻秸秆制备微生物絮凝剂及改善污泥脱水性能的研究[J].中国环境科学,2016,36(11):3360-3367.
[12] Wang L F,Wang L L,Li W W,et al. Surfactant-mediated settleability and dewaterability of activated sludge[J].Chemical Engineering Science,2014,116:228-234.
[13] 李雪,李飞,曾光明,等.表面活性剂对污泥脱水性能的影响及其作用机理[J].环境工程学报,2016,10(5):2221-2226.
[14] 中华人民共和国建设部. CJ/T 221—2005 城市污水处理厂污泥检验方法[S].北京:中国标准出版社,2006.
[15] 潘胜,黄光团,谭学军,等.Fenton试剂对剩余污泥脱水性能的改善[J].净水技术,2012,31(3):26-31,35.
[16] Yoon J,Lee Y,Kim S. Investigation of the reaction pathway of OH radicals produced by Fenton oxidation in the conditions of wastewater treatment[J].Water Science & Technology,2001,44(5):15-21.
[17] 宋相国,张盼月,张光明,等.Fenton氧化处理剩余污泥的作用机制[J].环境科学与技术,2009,32(7):64-67.
[18] Mohajeri S,Aziz H A,Isa M H,et al. Statistical optimization of process parameters for landfill leachate treatment using electro-fenton technique[J].Journal of Hazardous Materials,2010,176(1/3):749-758.
[19] 寇成贵,崔丰元.聚合硫酸铁对污泥脱水性能研究[J].环境科学与管理,2015,40(3):67-70.
[20] 周翠红,凌鹰,曾萌,等.微波/超声波对污泥粒度与水分的影响[J].环境工程学报,2017,11(1):529-534.
[21] 周贞英.电化学预处理与表面活性剂联合调理对污泥脱水性能的影响[D].山西: 太原理工大学,2011.
[22] 洪晨,邢奕,王志强,等.不同pH下表面活性剂对污泥脱水性能的影响[J].浙江大学学报(工学版),2014,48(5):850-857.
[23] 袁园.表面活性剂及酸处理对污泥脱水性能影响的研究[D].上海: 同济大学,2003.
[24] Salton M R. The properties of lysozyme and its action on microorganisms[J].Bacteriological Reviews,1957,21(2):82-100.
[25] 施周,戴慧奇,罗璐,等.溶菌酶和硫酸铝联用优化污泥脱水性能的研究[J].安全与环境学报,2017,17(4):1392-1397.