乙二胺四乙酸EDTA生产高盐高COD废水蒸发浓盐渣资源化

              乙二胺四乙酸（EDTA，分子式C₁₀H₁₆N₂O₈）生产产生的高盐高COD高氨氮废水，经蒸发器蒸发脱水后，浓盐渣主要成分为：氯化钠（NaCl，65%-75%）、硫酸钠（Na₂SO₄，10%-15%）、未反应EDTA（C₁₀H₁₆N₂O₈，3%-8%）、氨氮化合物（NH₄⁺，1%-3%）及少量杂质（2%-5%）。

通过浓缩、分离、富集、萃取、结晶、提纯等工艺，实现高价值物料回收：有机物料中，EDTA（C₁₀H₁₆N₂O₈）提纯至工业级，用作金属螯合剂、水处理剂；氨氮化合物回收为氯化铵（NH₄Cl），用于农业肥料、化工原料。无机盐物料中，氯化钠（NaCl）提纯后用于氯碱行业原料，硫酸钠（Na₂SO₄）制成工业级元明粉，应用于建材、印染领域。

仅微量无利用价值杂质按危废规范处置，真正实现浓盐渣“变废为宝”，大幅降低危废处置成本，兼顾环保达标与经济效益双赢，助力企业绿色低碳高质量发展。

 Resource Utilization of Evaporated Concentrated Salt Residue from High-Salt and High-COD Wastewater in Ethylenediaminetetraacetic Acid (EDTA) Production

       Ethylenediaminetetraacetic acid (EDTA, molecular formula C₁₀H₁₆N₂O₈) production generates high-salt, high-COD and high-ammonia-nitrogen wastewater. After evaporation and dehydration by evaporator, the concentrated salt residue mainly consists of: sodium chloride (NaCl, 65%-75%), sodium sulfate (Na₂SO₄, 10%-15%), unreacted EDTA (C₁₀H₁₆N₂O₈, 3%-8%), ammonia nitrogen compounds (NH₄⁺, 1%-3%) and a small amount of impurities (2%-5%).

Through processes such as concentration, separation, enrichment, extraction, crystallization and purification, high-value materials are recovered: among organic materials, EDTA (C₁₀H₁₆N₂O₈) is purified to industrial grade and used as metal chelating agent and water treatment agent; ammonia nitrogen compounds are recovered as ammonium chloride (NH₄Cl) for agricultural fertilizers and chemical raw materials. Among inorganic salt materials, sodium chloride (NaCl) is purified for use as raw material in chlor-alkali industry, and sodium sulfate (Na₂SO₄) is made into industrial-grade Glauber's salt, which is applied in building materials and printing and dyeing fields.

Only useless impurities are disposed of in accordance with hazardous waste regulations, truly turning concentrated salt residue into treasure, greatly reducing hazardous waste disposal costs, achieving a win-win situation of environmental compliance and economic benefits, and helping enterprises develop in a green, low-carbon and high-quality way.