废纸浆与硫酸铝联用强化混凝沉淀效果研究
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摘要
使用硫酸铝与废纸浆混凝处理地表水,研究废纸浆对地表水混凝沉淀效果的强化作用。结果表明,当地表水浊度为14.7~21.8 NTU,水温为12~14℃时,先投加20 mg/L的硫酸铝,以200r/min搅拌1 min后,再投加20 mg/L的废纸浆,以100 r/min搅拌5 min、50 r/min搅拌10 min,沉淀20 min后出水的浊度为1.37~2.03 NTU,优于单独使用硫酸铝的处理效果。同时,废纸浆的使用还能加快絮体沉降速度,降低出水的COD_(Mn)和余铝含量,起到强化硫酸铝混凝沉淀效果的作用。该方法既可为新型混凝剂的研制提供参考,也为废纸浆的高值化利用拓宽思路。
The treatment effect of surface water through coagulation and sedimentation experiment by combining application of aluminum sulfate and recycled fibers was studied. The enhanced coagulation sedimentation function of recycled fibers was also discussed. The experimental results demonstrated that when the raw water's turbidity was 14. 7 ~ 21. 8 NTU and temperature was 12 ~ 14℃,adding aluminum sulfate with the dosage was 20 mg/L and stiring for 1 min at 200 r/min,then adding 20 mg/L of recycled fibers and stirring at 100 r/min for 5 min at 50 r/min for 10 min,sedimentation for 20 min,the turbidity of the effluent was 1. 37 ~ 2. 03 NTU,which was improved more than 50% compared with the use of aluminum sulfate alone. The application of recycled fibers not only could increase the settling rate of flocs,but also reduce COD_(Mn) and residual aluminum,enhance the coagulation and sedimentation.
The treatment effect of surface water through coagulation and sedimentation experiment by combining application of aluminum sulfate and recycled fibers was studied. The enhanced coagulation sedimentation function of recycled fibers was also discussed. The experimental results demonstrated that when the raw water's turbidity was 14. 7 ~ 21. 8 NTU and temperature was 12 ~ 14℃,adding aluminum sulfate with the dosage was 20 mg/L and stiring for 1 min at 200 r/min,then adding 20 mg/L of recycled fibers and stirring at 100 r/min for 5 min at 50 r/min for 10 min,sedimentation for 20 min,the turbidity of the effluent was 1. 37 ~ 2. 03 NTU,which was improved more than 50% compared with the use of aluminum sulfate alone. The application of recycled fibers not only could increase the settling rate of flocs,but also reduce COD_(Mn) and residual aluminum,enhance the coagulation and sedimentation.
引文
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[2]Shao Hong,Song Ying-chun,Zhang Di.A solid adsorbent of newspaper pulp and its preparation method:China,CN102068964A[P].2011-05-25.邵红,宋迎春,张迪.一种报纸纸浆固体吸附剂及其制备方法:中国,CN102068964A[P].2011-05-25.
[3]Yang Zhen,Yang Lian-li.Preparation of superabsorbent polymer through multi-constitutes grafting of modified pulp[J].Chemical Intermediate,2008,(1):5.杨振,杨连利.改性废纸浆多元接枝制备高吸水性树脂[J].化工中间体,2008,(1):5.
[4]Chen Wan-juan,Gu Ju,Xu Su-hua.Exploring nanocrystalline cellulose as a green alternative of carbon black in natural rubber/butadiene rubber/styrene-butadiene rubber blends[J].Express Polymer Letter,2014,8(9):659.
[5]Sun Yongjun,Zhu Chengyu,Sun Wenquan,et al.Plasma-initiated Polymerization of Chitosan-based CS-g-P(AM-DMDAAC)Flocculant for the Enhanced Flocculation of Low-Algal-Turbidity Water[J].Carbohydrate Polymers,2017,164:222.
[6]Gao Nai-yun.Discussion on the application status and potential hazards of polyacrylamide in drinking water treatment[J].Water&Wastewater Engineering,2010,36(11):1.高乃云.浅议饮用水处理中聚丙烯酰胺的应用现状及潜在危害[J].给水排水,2010,36(11):1.
[7]Xie Jing,Chen You-jun,Bi Zhe,et al.Coagulation of a low temperature and turbidity raw source water by Fe-Al composite coagulants[J].Chinese Journal of Environmental Engineering,2014,8(9):3546.谢菁,陈有军,毕哲,等.铁铝复配混凝剂处理低温低浊水[J].环境工程学报,2014,8(9):3546.
[8]Mao Yu-hong,Feng Jun-jie,Chang Qing,et al.Influence of chitosan coagulat aid on the coagulation process of polyaluminum chloride[J].China Environmental Science,2015,35(4):1096.毛玉红,冯俊杰,常青,等.壳聚糖助凝对PAC混凝过程的影响[J].中国环境科学,2015,35(4):1096.
[9]Ghanbari Davood,Salavati-Niasari Masoud,Beshkar Farshad,et al.Electro-Spinning of Cellulose Acetate Nanofibers:Microwave Synthesize of Calcium Ferrite Nanoparticles and CA-Ag-Ca Fe2O4Nanocomposites[J].J.Mater Sci.,2015,26(11):8358.
[10]LI De-juan,FU Ying-juan,QIN Meng-hua.Research Progress of Cellulose Controlled Graft Copolymerization Technology[J].China Pulp&Paper,2013,32(7):60.李德娟,傅英娟,秦梦华.纤维素可控接枝聚合技术的研究进展[J].中国造纸,2013,32(7):60.
[11]Min Xiao,Jiancan Hu.Cellulose/Chitosan composites prepared in ethylene diamine/potassium thiocyanate for adsorption of heavy metal ions[J].Cellulose,2017,24(6):2545.
[12]Wang Runnan,Zhang Hao,Lian Lili,et al.Synthesis and application of a novel PSi AM-CMC composite flocculant[J].Fine Chemicals,2017,34(9):1044.王润楠,张浩,连丽丽,等.聚硅酸铝镁-羧甲基纤维素钠复合絮凝剂的制备及应用[J].精细化工,2017,34(9):1044.
[13]Wang Zhihong,Cui Fuyi,Zheng Xueshu,et al.Factors Affecting the Aluminum Removal Efficiency in the Process of Coagulation/Sedimentation[J].China Water&Wastewater,2001,17(10):5.王志红,崔福义,郑学书,等.混凝沉淀中影响除铝效率的因素[J].中国给水排水,2001,17(10):5.
[14]Kim Juyoung,Lee Beomgoo.Manufacturing method of lignocellulose media coupled with Fe or Al:WO,2005033184A1[P].2005-04-14.
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