涂铁污泥吸附处理中低浓度氨氮废水-有色金属科学与工程.DOCVIP

涂铁污泥吸附处理中低浓度氨氮废水 柴立元1,2 罗仙平1 丁丽超陈云嫩江西理工大学资源与环境工程学院，江西赣州341000） 摘 要：表明：，拟二级速率方程 关键词：氨氮废水，氯化铁改性，污泥，吸附 中图分类号： 文献标志码：A The treatment of wastewater containing medium-low ammonium-nitrogen using sewage sludge modified by ferric chloride Chai liyuan1,2, Luo xianping1, Ding lichao1, Chen yunnen1* (1. School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou,341000, China; 2. School of Metallurgical Science Engineering, Central South University, Changsha, 410083, China.) Abstract：ontamination containing nitrogen untreated or treated incompletely can be harmful to environment. The traditional ways are inefficient for treating medium-low ammonium-nitrogen. Using residual activated sludge from sewage plant modified 2 h by ferric chloride as adsorbent, wastewater containing medium-low ammonium-nitrogen was treated. The experimental results indicated that the removal of ammonium- nitrogen can attained above 95% when ferric chloride 0.15 mol/L, dosage 5 g/L, pH 9, contact 40 min at room temperature. And the adsorption process accords with pseudo second-order kinetics equation. Under the experimental condition, initial ammonium-nitrogen concentration and COD being 102.68 mg/L and 362 mg/L in actual industrial wastewater was reduced to 9.2 mg/L and 83 mg/L for NH4+ and COD respectively after adsorption treatment, which achieved Integrated wastewater discharge standard（NH4+15 mg/Land COD100 mg/L）. Keywords：wastewater containing ammonium-nitrogen, modified by ferric chloride, sewage sludge, adsorption 1 前言 氨氮废水来源很广且排放量大，如化肥、焦化、石化、制药、垃圾填埋场等均产生大量氨氮废水。氨氮废水对环境的影响已引起环保领域和全球范围的重视，近20年来，国内外对氨氮废水处理方面开展了较多的研究，主要涉及生物法、物化法的各种处理工艺，如生物法有硝化[1,2]和藻类养殖；物化法有土壤灌溉、吸附法[3~6]、氨吹脱[7]、离子交换法[8]、蒸馏[9]、化学沉淀法[10,11]、反渗透[12,13]、折点氯化、电化学处理、催化裂解等，但是这些方法对于中低浓度氨氮废水的处理效率都不高。 污水处理厂的污泥中大约含有70 %的粗蛋白质，25 %左右的碳水化合物，而无机灰分仅占5 %左右。污泥在一定高温下可热解得到多孔衍生材料，不仅成本低廉，而且具有较好的吸附性能，可应用于污水处理[14]、有害气体吸附等，同是采用氯化锌、硫酸、磷酸等作为活化剂在高温条件下对污泥进行活化，并将其用于处理重金属废水处理[15,16]。三价铁具有