硫酸生产中废水治理工艺的改进

Improvement of Wastewater Treatment Process in Sulphuric Acid Production

采用ＮａＣｌＯ氧化共沉淀脱砷工艺处理硫酸废水，在ＮａＣｌＯ投加量１２００ｍｇ／Ｌ、铁砷比３．０、氧化终点ｐＨ３．５、聚丙烯酰胺投加量１５ｍｇ／Ｌ的条件下，处理后出水中砷含量降至１．０６ｍｇ／Ｌ，再经第二级中和沉淀后可达到国家排放标准。此工艺能使砷富集于沉渣中，达到可回收的水平，此外还可大大减少含砷废渣的产生量。

Under the conditions of 1200mg/L of NaClO and 15mg/L of PAM dosed,3.00of iron/arsenic(mol ratio)and pH 5 at the end of oxidation,the wastewater from snlphu-ric acid production has been treated by NaClO oxidation coprecipitation process to removearsenic. The arsenic content in the effluent is decreased to 1.06/L. Through furthertreatment by secondary neutralization and precipitation,the final effluent quality can meetthe national discharge standards.The arsenic transferred and concentrated into the processprecipitating sludge can be recovered.The yield of arsenic containing sludge is reducedsignificantly.