Neutralization & Compliant Disposal of Coloring Waste Liquors
化学着色废液的中和与合规处置
标签：废液中和, 环保, 硫化物废液, 重金属, 合规
着色废液须分类处理：含硫废液先加 3% 双氧水搅拌 30 min 将硫离子氧化至 <1 mg/L，再调 pH 7–8 排放；含铜、锌废液用石灰乳调 pH 9–10，使金属以氢氧化物沉淀，上清液重金属 <0.5 mg/L 后方可交有资质单位处置，污泥按危废（HW17/HW22）转移联单管理。硝酸系废液严禁与含硫废液混存——混合会释放二氧化氮并放热。车间须留存每批废液的 pH 与重金属快检记录备查。
Segregate waste streams: oxidize sulfide liquors with 3% hydrogen peroxide for 30 min to below 1 mg/L sulfide, then neutralize to pH 7–8; precipitate copper and zinc from metal-bearing baths with milk of lime at pH 9–10, releasing supernatant only under 0.5 mg/L heavy metals via a licensed contractor, with sludge handled under hazardous-waste manifests (HW17/HW22). Never store nitrate and sulfide wastes together — mixing releases NO₂ exothermically. Keep pH and quick-test heavy-metal records for every batch.