摘要
日化行业产生含高浓度阴离子表面活性剂的LAS废水,若直接排放将会造成严重的环境污染。本文以聚合氯化铝(PAC)、聚合硫酸铁(PFS)为混凝剂,以聚丙烯酰胺(PAM)为助凝剂,以氧化钙(CaO)、氢氧化钠为水样p H调节剂,进行混凝沉淀试验,采用单因素试验确定混凝剂、助凝剂、p H调节剂的处理效果及最佳投药量范围。结果表明,此类废水中CODCr、LAS、色度去除的关键影响因子为p H调节剂种类,其次为反应p H,混凝剂及助凝剂种类和投加量影响较小;最佳p H调节剂为CaO,反应p H控制在8.5~9.5,PAM投加量宜为5~10 mg/L。经混凝沉淀处理后,废水中COD_(Cr)去除率可达75%以上,LAS、色度去除率均达85%以上,证明采用氧化钙(CaO)化学混凝沉淀工艺处理LAS废水是一种高效、便捷的方法。
Daily chemical industry wastewater contains high concentration of an-ionic surfactant LAS, which will cause serious environmental pollution if it is discharged directly. In this paper, coagulation sedimentation experiments were carried out, using polyaluminium chloride （PAC）, Polymeric ferric sulfate （PFS） as coagulant, and polyacrylamide （PAM） as coagulant aid, and calcium oxide （CaO）, sodium hydroxide as the water pH regulator. Species of flocculant, coagulant aid, pH regulator and the best range of dosage were determined according to these single factor experiments. The results showed that, key impact factor of removal CODcr, LAS, chroma from LAS wastewater was species of pH regulator, followed by reaction pH, yet effect of coagulant and coagulant aid species and dosing quantity was smallest. Optimal pH regulator was CaO, and reaction pH value should be controUed between 8.5 and 9.5, and 5-10 mg/L of PAM dosing quantity was appropriated. After coagulation sedimentation treatment, the removal effeciency of CODcr, LAS and chroma from LAS wastewater could reach more than 75 %, 85 %, 85 %, respectively. The results proved that chemical coagulation sedimentation using calcium oxide （CaO） as treatment agent is an effective and convenient method for LAS wastewater treatment.
作者
练文标
潘凤开
Lian Wenbiao Pan Fengkai(CNHomeland Environmental Co., Ltd. Guangzhou 510630, China)
出处
《广东化工》
CAS
2017年第19期128-129,共2页
Guangdong Chemical Industry
基金
[基金项目]广东省工业园废水污染控制与资源化工程技术研究中心(2016S-P156)
