三段石灰-铁盐法处理高砷洗气污酸废水

摘要

砷化物的不可降解性决定了砷污染处理中化学法的不可替代性,针对高砷洗气污酸废水,在分析了几种主要处理方法特点的基础上,提出了三段石灰—铁盐法。以很低的处理费用确保高砷洗气污酸废水达标排放,同时得到三部分固体渣：高含量的砷钙渣、非危固石膏渣和极少量含砷铁盐渣。高含量的砷钙渣和非危固石膏渣可资源化利用,少量含砷铁盐渣送危险固体废物处理中心处理。%The non-degradability of arsenates determines that chemical processing is a must for arsenate-contaminated wastes.When addressing the characteristics of some major processing methods,a three-stage lime-ferric salt method is proposed for high arsenic impure acid wastewater.Using this method,the wastewater can be discharged with industrial standards after treated with very low costs.Meanwhile,three solid residues can be obtained： high-content calcium arsenate residues,non-dangerous gypsun waste,and minute arsenic-ferric salts residues;the former two can be reutilized while the latter can be treated in some dangerous solid waste processing centers.