SALT PRODUCTION FROM WASTEWATER

Many processes generate wastewater streams rich in sulfate and chloride. These salt components are traditionally not recovered and are discharged to the environment. The invention recovers pure waterfor recycle/reuse and simultaneously generates valuable pure salts of NaCl and Na2SO4 for beneficial reuse, eliminating the waste stream. Process consists of the sequential crystallization of salt products with an intermediate purification step in which a chemical reactant is added to elevate levels of purity. The process is configured to simultaneously achieve zero liquid discharge. 煤气化过程产生富含硫酸盐和氯化物的废水流。传统上这些盐组分不会被回收而是被排放到环境中。本发明回收纯水以用于再循环/再利用，同时生成有价值的NaCl和NaSO纯盐以有益地再利用，从而消除了废物流。该工艺由盐产品的顺序结晶构成，所述顺序结晶具有其中添加化学反应物以提高纯度水平的中间纯化步骤。该工艺配置为同时实现零液体排放。