【摘要】 某印染工业园内的印花废水水量波动大，导致综合污水处理厂氮负荷高。采用混凝—铁碳微电解—次氯酸钠氧化组合工艺对该高氮废水进行处理。实验结果表明，在不调节初始 pH、硫酸亚铁与聚丙烯酰胺投加量分别为 400、15 mg/L 的条件下，混凝阶段的 COD 去除率达到 83.12%。在初始 pH 为 4、铁碳质量比为 1∶1、铁投加量为60 g/L、气水比为 5∶1、HRT 为 120 min 的条件下，对混凝出水进行铁碳微电解，出水 pH 升至 6.91,COD 和 NO₃^--N 的去除率分别为 50.26%、53.66%,NH₄⁺-N 为 NO₃^--N 的主要还原产物。用次氯酸钠氧化法处理微电解出水，未调节初始pH、次氯酸钠与总凯氏氮质量比为 8.5∶1、反应时间为 30 min 时，TN、NH₄⁺-N 的去除率分别为 88.56% 、97.75% 。经该组合工艺间歇处理后，出水 COD≤55 mg/L、TN≤14 mg/L、NH₄⁺-N≤1 mg/L，可达到《纺织染整工业水污染物排放标准》（GB 4287—2012）表 2 的直接排放要求。经核算，该工艺的药剂成本为 5.09 元/t。更多还原

【Abstract】 In order to solve the problem of high nitrogen load caused by large fluctuation of wastewater in a printing and dyeing industrial park,a combined coagulation-iron carbon microelectrolysis-sodium hypochlorite oxidation process was used to treat the high nitrogen wastewater. The experimental results showed that the COD removal rate in coagulation stage reached 83.12% under the conditions of no adjustment of initial pH,ferrous sulfate and polyacrylamide dosage of 400 and 15 mg/L,respectively. Under the conditions of initial pH of 4,iron-carbon mass ratio of 1∶1,iron dosage of 60 g/L,gas-water ratio of 5∶1 and HRT of 120 min,iron-carbon microelectrolysis was applied to the coagulation effluent. The effluent pH increased to 6.91,and the removal rates of COD and NO₃^--N were50.26% and 53.66%,respectively,with NH₄⁺-N as the main reduction product of NO₃^--N. The microelectrolysis effluent was treated with sodium hypochlorite. Under the conditions of no adjustment of initial pH,sodium hypochlorite to total Kjeldahl nitrogen mass ratio of 8.5∶1 and reaction time of 30 min,the removal rates of TN and NH₄⁺-N were 88.56% and 97.75%,respectively. After intermittent treatment of combined process,the effluent COD≤55mg/L,TN≤14 mg/L and NH₄⁺-N≤1 mg/L,met the direct discharge requirements in Table 2 of the Discharge standards of water pollutants for dyeing and finishing of textile industry（GB 4287—2012）. After calculating,the cost of chemical agent of the process is 5.09 Yuan per ton.更多还原