投加次氯酸钠对南水北调终端泵站调蓄池内水质影响研究  

Effects of sodium hypochlorite on water quality in a regulating tank in a terminal pumping station of the South-to-North Water Diversion

作　　者：陈婷 穆艳宇 许嘉慧 路桢 翟洪艳[1] CHEN Ting;MU Yanyu;XU Jiahui;LU Zhen;ZHAI Hongyan(School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China;Yinjiang Branch Com pany of Tianjin Water Group,Tianjin 300122,China)

机构地区：[1]天津大学环境科学与工程学院,天津300350 [2]天津水务集团有限公司引江市区分公司,天津300122

出　　处：《给水排水》2024年第1期1-7,共7页Water & Wastewater Engineering

基　　金：国家自然科学基金面上项目(52270009);天津水务集团有限公司项目(2020GFW-0334)。

摘　　要：随着南水北调中线输水工程的运行,输水末端调节池内逐渐出现了藻类增殖和泥沙淤积的问题。管理单位拟采用投加次氯酸钠的方法抑制藻类增殖、淤泥上浮,但加氯对水质、悬浮物和淤泥的影响是未知的。因此探究了不同加氯量对不同深度水质、对悬浮物、淤泥沉淀特征和性质的影响。研究结果表明加氯虽然造成水中悬浮颗粒的暂时升高,但同时提高了悬浮物的沉降速度,且加氯量越大,悬浮物沉降速度越快。加氯能减少出水中有机物含量但不会增加其浊度,使出水水质更好。次氯酸钠直接和淤泥接触后,会轻微破坏淤泥表面的有机物、藻类等微生物的附着状态,使淤泥有机质释放到上清液,总有机碳浓度显著升高。淤泥溶液加氯能够造成浊液层颗粒增加,但是此类颗粒的沉降速度也被加快,加氯并不影响出水中的浊度,消毒副产物生成情况低于检出限。加氯后淤泥颗粒粒径无明显影响。In the operation of the South-to-North Water Diversion Project Middle Line,algae proliferation and sedimentation gradually became a problem to regulating tanks at the end of the water transmission.The regulating tank management company proposed to dose sodium hypochlo-rite to inhibit the proliferation of algae and sludge floating.However,the effects of sodium hypo-chlorite on water quality,suspended solids,and sludge are unknown.Thus the effects of dosing sodium hypochlorite on water quality at different depths and characteristics and properties of silt were investigated.Dosing sodium hypochlorite caused a temporary increase of suspended particles in the water,but at the same time increased the sedimentation rate of suspended solids.The sedimentation rates of suspended solids increased with the doses of sodium hypochlorite.Sodium hypochlorite reduced the content of organic matter in the effluent water but did not increase turbidity,leading to the improvement of effluent water quality.As sodium hypochlorite was mixed with the sludge,it slightly destroyed the attachement of organic matters,algae and microorganism on sludge particles,leading to the increase of total organic carbon.Sodium hypochlorite caused the increase of turbid layer depth and settling speed in sludge settling processed.Dosing sodium hypochlorite did not increased the turbidity of the effluent.The formation of disinfection by-products was lower than the detection limits.The particle sizes of sludge was not affected by sodium hypochlorite.

关 键 词：南水北调 藻类 加氯 供水安全 污泥 

分 类 号：TU991.6[建筑科学—市政工程]