无机—有机复合膨润土用于焦化废水的深度处理

Advanced Treatment of Coking Wastewater with Inorganic/Organic Composite Modified Bentonite

对辽宁省黑山钙基膨润土进行有机—无机复合改性,开发了一种高效、廉价的吸附剂,并将其用于焦化废水的深度处理,考察了膨润土粒径、反应温度、吸附剂投量、反应时间、pH等因素的影响。结果表明,经5g/L的Al2(SO4)3及0.02mol/L的十六烷基三甲基溴化铵(CTMAB)复合改性的膨润土,能同时去除焦化废水二级生化出水中残留的氨氮和COD,在投量为40g/L、反应时间为30min、反应温度为25℃、pH值为9的条件下,对氨氮和COD的去除率可分别达75%和47%,处理出水的氨氮和COD可分别降至25mg/L和150mg/L以下,为焦化废水的再生回用创造了条件。

Through the organic and inorganic composite modification of the calcium-base bentonite from Heishan of Liaoning Province, an efficient and inexpensive adsorbent was developed and used in advanced treatment of coking wastewater. The influences of factors such as bentonite size, reaction temperature, adsorbent dosage, pH value, reaction time and so on were investigated. The results show that the bentonite modified with Al2 （SO4）3 of 5 g/L and CTMAB of 0.02 mol/L can remove the ammonia nitrogen and COD from the secondary effluent. Under the conditions of the dosage of 40 g/L, time of 30 min, temperature of 25 ℃ and pH value of 9, the removal rates of ammonia nitrogen and COD can reach 75% and 47% respectively. The effluent concentrations of ammonia nitrogen and COD can be reduced to less than 25 mg/L and 150 mg/L respectively. The developed adsorbent creates favorable condition for reclamation and reuse of coking wastewater.