摘要
针对负二价硫离子(S^(2-))显COD性质,采用硫酸亚铁(FeSO_(4))与聚合硫酸铁和聚合氯化铝(“PFS+PAC体系”)开展对500 mg/L S^(2-)的模拟含硫废水中COD的去除研究。结果表明:FeSO_(4)和“PFS+PAC体系”的投加都能有效去除COD,过量FeSO_(4)(S/Fe摩尔比小于0.5)可使COD的去除率达85%,PAC和PFS的投加量为644,2080 mg/L时COD去除率达到82%;“PFS+PAC体系”和FeSO_(4)联合投加时,增加FeSO_(4)对COD的去除率提升并不明显,PAC投加量增加到161 mg/L以后不再提高COD去除率,PFS的投加量增加可以进一步提高COD去除率。“PFS+PAC体系”投加量的增加会导致污泥沉降比增加(最大达95.5%);当PAC和PFS的投加量分别低于161,520 mg/L时,FeSO_(4)的投加可以减少污泥量(S/Fe由40~10时,SV减少25.4%)。研究成果对于降低高S^(2-)、低有机质废水的COD浓度及防止S^(2-)对污水处理系统的影响具有一定意义。
According to the reducibility characteristics of sulfur ion(S^(2-)),FeSO_(4) and polymeric ferric sulfate+polyaluminium chloride(“PFS+PAC”)was used to remove COD in 500 mg/L S^(2-)artificial wastewater.Results showed that COD decreased with increasing the dosage of FeSO_(4) or“PFS+PAC”COD removal rate was up to above 85%with adding excessive FeSO_(4)(S/Fe mole ratio<0.5),and 82%with adding 644 mg/L PAC+2080 mg/L PFS;the experiment combined addition with FeSO_(4) and“PFS+PAC”demonstrates the change of FeSO_(4) dosage affected little to COD removal rate,PAC dosage of 161 mg/L obtained the maximum COD removal rat,COD removal rat increased if“PFS+PAC”dosage increasing.The index of sludge settling velocity(SV)was considered,which occurred higher if“PFS+PAC”dosage increased(highest value was found 95.5%);FeSO_(4) dosage produced a reduction effect on sludge generation,when PFS&PAC dosage lower than 161,520 mg/L.The study has a practical significance for preventing the damage from S^(2-)to sewage treatment system.
作者
梁培瑜
张世金
邓觅
朱林
吴施婧
吴永明
刘煜
LIANG Pei-yu;ZHANG Shi-jin;DENG Mi;ZHU Lin;WU Shi-jing;WU Yong-ming;LIU Yu(Institute of Microbiology,Jiangxi Academy of Sciences,Nanchang 330096,China;Jiangxi Province Environmental Monitoring Central,Nanchang 330077,China)
出处
《应用化工》
CAS
CSCD
北大核心
2022年第4期1060-1063,1076,共5页
Applied Chemical Industry
基金
江西省重点研发计划项目(20192BBGL70045,20202BBGL73082)
江西省中央引导地方科技发展专项资金项目(20192ZDD01001)
江西省科学院重点研发项目(2020-YZD-25,2020-YZD-28)。
关键词
硫离子
化学沉淀
COD
污水处理
试验研究
sulfur ion
chemical precipitation
COD
wastewater treatment
experimental study
