Optimization effects of chemical conditioning reagent on the dehydration of river and lake sludge and the pH of sludge cake

doi:10.14088/j.cnki.issn0439-8114.2023.06.010

Abstract

Abstract: The effects of different dosages and particles size of CaO on the dehydration effect and pH of sludge cake were investigated based on the original caustic lime dosage from the actual project. In addition, under the premise of the optimum addition and particle size of the lime, the compound formulation effects of CaO and NaHCO₃, calcium lignin sulfonate, polyferric sulfate （PFS）, polyaluminium chloride （PAC） and polyacrylamide （PAM） on dehydration effect and pH of sludge cake was studied. The results showed that, the reduction of the CaO dosage could decrease the pH of sludge cake to a certain extent, but the moisture content of sludge increased slightly. The moisture content of sludge cake after dewatering appeared significantly different for the different particle sizes of CaO powder. As a whole, the moisture content decreased, while the pH increased with the decrease of CaO particle size. The combination of NaHCO₃, calcium lignosulfonate and CaO could reduce the pH of sludge cake, but weaken the dehydration effect,the moisture content of sludge cake increased relatively large. The dehydration effect of PAC or PAM compounded CaO was slightly better than that of PFS compounded CaO. Considering the dehydration effect and the pH of sludge cake, the optimal combination was 0.50% PAC + 0.02% PAM + 9.00% （120 mesh） CaO.

Key words: chemical conditioning reagent, river and lake sludge, sludge cake, dehydration effect, pH

CLC Number:

X524

WANG Long-tao, CHEN Wen-feng, HUANG Sheng, XU Yang-fan, XIA Xin-xing. Optimization effects of chemical conditioning reagent on the dehydration of river and lake sludge and the pH of sludge cake[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(6): 51-55.

References

[1] 奚本锋. 利用湖泊淤泥制备多孔节能砖的技术和产品性能研究[D]. 南京: 东南大学, 2008.
[2] 魏亮亮,孔祥娟,辛明,等. 国内外污泥处理处置标准指标分析及对我国相关标准研究的建议[J]. 黑龙江大学自然科学学报, 2014, 31(6): 790-799,853.
[3] JOMMA S, SHANABLEH A, KHALIL W, et al.Hydro-thermal decomposition and oxidation of the organic component of municipal and industrial waste products[J]. Advances in environmental research, 2003, 7(3):647-653.
[4] DEWIL R, BAEYENSA J, GOUTVRIND R.The use of ultrasonics in the treatment of waste activated sludge[J]. Chinese journal of chemical engineering, 2006, 14(1): 105-113.
[5] MCMINN W A,KEOWN J,ALLEN S J, et al.Effect of freeze-thaw process on partitioning of contaminants in ferric precipitate[J]. Water research, 2003, 37(20): 4815-4822.
[6] 李川,张晴波,赵东华,等.受污染河湖的疏浚底泥快速脱水干化新工艺的应用[J]. 净水技术, 2015, 34(3): 101-104.
[7] CHEN Y G, YANG H Z, GU G W.Effect of acid and surfactant treatment on activated sludge dewatering and settling[J]. Water research, 2001, 35(11): 2615-2620.
[8] 陶明涛. 污泥含水率快速测量方法研究[J].广东化工,2014, 41(9):218-219.
[9] KOPP J, DICHTL N.Prediction of full-scale dewatering results of sewagesludges by the physical water distribution[J]. Water science & technology, 2001,43(11): 135-143.
[10] 张昊. 基于新型骨架构建体与高级氧化剂的污泥复合调理及脱水研究[D].武汉: 华中科技大学, 2014.
[11] 周海杨,蒋晨晖,文帅,等.化学调理剂对黑臭河道疏浚淤泥脱水性能的影响研究[J].交通世界, 2019(11): 42-44.
[12] 林城. 以膨润土为辅助添加剂固化/稳定化污泥的试验研究[D].南京: 河海大学, 2007.
[13] 莫汝松,戴文灿,孙水裕,等.氧化剂对氯化铁与石灰联合调理污泥脱水性能的影响[J].环境科学与技术, 2015, 38(9):147-151.
[14] HE D Q, WANG L F, JIANG H, et al.A Fenton-like process for the enhanced activated sludge dewatering[J].Chemical engineering journal, 2015, 272: 128-134.
[15] 王慧,王茜徵,翟晓峰,等.调理剂对改善河道底泥脱水性能的效果研究[J].环境工程, 2016, 34(S1): 186-189.
[16] 李一璇. 石灰在深圳梅林水厂污泥调质中的应用[J].给水排水, 2010, 46(11): 21-24.
[17] 丁绍兰,曹凯,董凌霄.石灰调理对污泥脱水性能的影响[J].陕西科技大学学报(自然科学版), 2015, 33(4): 23-27,36.
[18] 余志荣,郁雨苍.石灰在污泥调治中的应用及作用机理研究[J].中国给水排水,1989, 5(6): 7-11.
[19] 吴素花,李平,徐杰,等.污泥深度脱水絮凝剂的筛选以及采用无机微粒作为助凝剂对污泥脱水性能的优化[J]. 净水技术, 2016, 35(2): 64-70.
[20] 李诚. 木质素磺酸钙减水剂的改性研究[D].济南:济南大学,2007.