Enhancement sand filtration by an innovative filter aid: aluminum sulfate-chitosan (AS-CTS)
WANG Shan1, ZHANG Ke-feng1, LI Xing-guo1, JIA Rui-bao2
1. School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250021, China;
2. Shandong Province City Water Supply and Drainage Water Quality Center, Jinan 250021, China
A combination of aluminum sulfate (AS) and chitosan (CTS) was used as an innovative filter additive, namely AS-CTS, to enhance the filtration. The properties of the trapped organics were analyzed by molecular weight fractionation and three-dimensional fluorescence spectroscopy, and the mechanism of enhanced filtration by AS-CTS was preliminarily investigated via the analysis of zeta potential, floc size, and fractal dimension. The results indicated that AS-CTS strengthened the filtration much more than AS or CTS alone. Under the optimum condition (AS/CTS mass ratio of 2/1, CTS dosage of 0.3mg/L, rotation speed of 300r/min, and stirring time of 2min) the effluent turbidity was 0.1NTU, particulate matter was 125/mL, residual aluminum concentration was 0.02mg/L. The turbidity and particulate matter removal rate was respectively 58% and 61.7% higher than that without AS-CTS. It was found that AS-CTS enhanced filtration could effectively remove hydrophobic humic acid with molecule weight > 30KDa, tryptophan protein with molecule weight between 1and 3KDa, soluble microbial metabolites, and fluvic-like acid. AS-CTS could increase the adhesion of colloidal particles on the surface of the filter media, mainly through the polymer bridging and interface chemistry, and enhanced the migration of particles to the surface of filter media by forming larger micro-flocculant in size and fractal dimension.
Kelly O. Cranston and Appiah Amirtharajah. Improving the Initial Effluent Quality of a Dual-Media Filter by Coagulants in Backwash[J]. JAWWA, 2009,(12):50-62.
[2]
许子洋.臭氧生物活性炭、微絮凝强化过滤及组合工艺处理污染原水的研究[D]. 杭州:浙江工业大学, 2017. Xu Z Y. Research on treatment of polluted raw water by O3-BAC and micro-flocculation enhanced filtration and combination process[D]. Hangzhou:Zhejiang university of technology, 2017.
[3]
Bongiovani M C, Camacho F P, Coldebella P F, et al. Removal of natural organic matter and trihalomethane minimization by coagulation/flocculation/filtration using a natural tannin[J]. Desalination & Water Treatment, 2016,57(12):5406-5415.
[4]
Xin H, Yu Z, Gao B, et al. Polyacrylamide as coagulant aid with polytitanium sulfate in humic acid-kaolin water treatment:Effect of dosage and dose method[J]. Journal of the Taiwan Institute of Chemical Engineers, 2016,64:173-179.
[5]
Xu Y, Chen T, Cui F, et al. Effect of reused alum-humic-flocs on coagulation performance and floc characteristics formed by aluminum salt coagulants in humic-acid water[J]. Chemical Engineering Journal, 2016,287:225-232.
[6]
蒲生彦,王可心,马慧,等.磁性壳聚糖凝胶微球对水中Pb(Ⅱ)的吸附性能[J]. 中国环境科学, 2018,38(4):1364-1370. Pu S J, Wang K X, Ma H, et al. Adsorption properties of magnetic chitosan hydrogel microspheres to Pb(Ⅱ) from aqueous solutions[J]. China Environment Science, 2018,38(4):1364-1370.
[7]
陈炜,张宇东,蔡珺晨,等.壳聚糖负载磺化酞菁钴催化过硫酸盐降解甲基橙的研究[J]. 中国环境科学, 2019,39(1):157-163. Chen W, Zhang Y D, Cai J C, et al. Degradation of methyl orange by chitosan microsphere supported cobalt tetrasulfophthalocyanine activated persulfate[J]. China Environment Science, 2019,39(1):157-163.
[8]
Fabris R, Chow C W, Drikas M. Evaluation of chitosan as a natural coagulant for drinking water treatment[J]. Water Science & Technology, 2010,61(8):2119-2128.
[9]
Bratskaya S, Schwarz S, Chervonetsky D. Comparative study of humic acids flocculation with chitosan hydrochloride and chitosan glutamate[J]. Water Research, 2004,38(12):2955-2961.
[10]
Chunxia Ma, Haiyan Pei, Wenrong Hu, et al. The enhanced reduction of C-and N-DBP formation in treatment of source water containing Microcystis aeruginosa using a novel CTSAC composite coagulant[J]. Science of the Total Environment, 2017,579:1170-1178.
[11]
Huang X, Gao B, Sun Y, et al. Effects of epichlorohydrin-dimethylamine on polytitanium chloride coagulation and membrane fouling in humic-kaolin water treatment:Dosage, dose method and solution pH[J]. Separation and Purification Technology, 2017,173(Complete):209-217.
[12]
GB/T 5750-2006生活饮用水标准检验方法[S]. GB/T 5750-2006 Standard Examination methods for drinking water[S].
[13]
Imai A, Matsushige K, Nagai T. Trihalomethane formation potential of dissolved organic matter in a shallow eutrophic lake[J]. Water Research, 2003,37(17):4284-4294.
[14]
Kuivinen J, Johnsson H. Determination of trihalomethanes and some chlorinated solvents in drinking water by headspace technique with capillary column gas-chromatography[J]. Water research, 1999,33(5):1201-1208.
[15]
齐玉玲,黄晓东,张金松,等.二次微絮凝改善过滤效果的试验研究[J]. 中国给水排水, 2005,21(2):34-36. Qi Y L, Huang X D, Zhang J S, et al. Experimental study on secondary microflocculation to improve filtration efficiency[J]. China Water & Wastewater, 2005,21(2):34-36.
[16]
陈有军,李涛,王东升,等.两种混凝剂的二次微絮凝过滤效果对比研究[J]. 供水技术, 2011,5(5):1-4. Chen Y J, Li T, Wang D S, et al. Comparative study of secondary microflocculation filtration effects of two coagulants[J]. Water Supply Technology, 2011,5(5):1-4.
[17]
Hall T, Croll B. Particle counters as tools for managing Cryptosporidium risk in water treatment[J]. Water Science & Technology, 1997,36(4):143-149.
[18]
黄斌,施周,张乐,等.基于颗粒物计数的微絮凝强化过滤效果探讨[J]. 中国给水排水, 2016,32(23):67-70. Huang B, Shi Z, Zhang L, et al. Discussion on Microflocculation Enhanced Filtration Effect Based on Particle Count[J]. China Water & Wastewater, 2016,32(23):67-70.
[19]
许保玖.给水处理理论[M]. 北京:中国建筑工业出版社, 2000:342. Xu B J. Theory of Feedwater Treatment[M]. Beijing:China Building Industry Press, 2000:342.
[20]
Xu Y, Chen T, Cui F, et al. Effect of reused alum-humic-flocs on coagulation performance and floc characteristics formed by aluminum salt coagulants in humic-acid water[J]. Chemical Engineering Journal, 2016,287:225-232.
[21]
Roussy J, Van V M, Dempsey B A, et al. Influence of chitosan characteristics on the coagulation and the flocculation of bentonite suspensions[J]. Water Research, 2005,39(14):3247-3258.
[22]
王昭阳,齐晶瑶,管永庆,等.壳聚糖强化絮凝对出水残余铝的控制效果[J]. 中国给水排水, 2013,29(3):10-13. Wang Z Y, Qi J Y, Guan Y Q, et al. Control effect of chitosan-enhanced flocculation on residual aluminum in effluent[J]. Chinese Water and Wastewater, 2013,29(3):10-13.
[23]
Zhu L, Wang L, Yin X. Chitosan and surfactant co-modified montmorillonite:A multifunctional adsorbent for contaminant removal[J]. Applied Clay Science, 2017,146:35-42.
[24]
Pressman J G, Mccurry D L, Parvez S, et al. Disinfection byproduct formation in reverse-osmosis concentrated and lyophilized natural organic matter from a drinking water source[J]. Water Research, 2012,46(16):5343-5354.
[25]
Li C, Wang D, Xu X, et al. Formation of known and unknown disinfection by-products from natural organic matter fractions during chlorination, chloramination, and ozonation[J]. Science of the Total Environment, 2017,587-588:177.
[26]
刘圣,娄华君,王秋阳,等.二次微絮凝与常规絮凝的对比试验[J]. 安全与环境学报, 2014,14(3):194-197. Liu S, Yan H J, Wang Q Y, et al. Comparative experiment between secondary microflocculation and conventional flocculation[J]. Journal of Safety and Environment, 2014,14(3):194-197.
[27]
Marhaba T F, Van D. The variation of mass and disinfection by-product formation potential of dissolved organic matter fractions along a conventional surface water treatment plant[J]. Journal of Hazardous Materials, 2000,74(3):133-147.
[28]
刘丽贞,黄琪,吴永明,等.鄱阳湖CDOM三维荧光光谱的平行因子分析[J]. 中国环境科学, 2018,38(1):293-302. Liu L Z, Huang Q, Wu Y M, et al. Parallel Factor Analysis of CDOM Three-dimensional Fluorescence Spectra in Poyang Lake[J]. China Environment Science, 2018,38(1):293-302.
[29]
GB/5749-2006生活饮用水卫生标准[S]. 2006. GB/5749-2006 Standards for drinking water quality[S]. 2006.
[30]
陈丹雯,黄富,朱世翠,等.氯消毒过程中水中色氨酸产生THMs和HAAs的特征研究[J]. 中国环境科学, 2018,38(11):4061-4067. Chen D W, Huang F, Zhu S C, et al. Generation characteristics of THMs and HAAs during tryptophan chlorination in aqueous system[J]. China Environmental Science, 2018,38(11):4061-4067.
[31]
Huang X, Gao B, Sun Y, et al. Effects of epichlorohydrin-dimethylamine on polytitanium chloride coagulation and membrane fouling in humic-kaolin water treatment:Dosage, dose method and solution pH[J]. Separation and Purification Technology, 2017,173:209-217.
[32]
Li D, Wu C, Wang Y, et al. Enhanced Treatment Properties of Iron Oxide Amended Sands Coupled with Polyelectrolyte to Humic Acid[J]. Water Environ Res, 2018,90(2):136-143.
[33]
Wang N, Xu Z, Xu W, et al. Comparison of coagulation and magnetic chitosan nanoparticle adsorption on the removals of organic compound and coexisting humic acid:A case study with salicylic acid[J]. Chemical Engineering Journal, 2018,347:514-524.
[34]
Wang Z, Nan J, Ji X, et al. Effect of the micro-flocculation stage on the flocculation/sedimentation process:The role of shear rate[J]. Science of The Total Environment, 2018,633:1183-1191.
[35]
范菲菲.水处理微絮凝阶段絮体形态特征对过滤效能影响研究[D]. 哈尔滨:哈尔滨工业大学, 2012. Fan F F. Study on the effect of flocculation morphological characteristics on filtration efficiency in water treatment microflocculation stage[D]. Harbin:Harbin Institute of Technology, 2012.
