国产精品伦一区二区丨最新版天堂资源中文官网丨久久人人妻人人做人人爽丨国产欧美国日产在线播放丨成人免费网站www网站高清丨久99综合婷婷丨日韩麻豆视频丨男男成人高潮片免费网站丨国产精品国产片丨日本无码人妻波多野结衣丨深爱综合网丨av毛片网丨国产精品入口尤物丨天天看夜夜丨黑人精品欧美一区二区蜜桃丨亚洲国产一区精品丨亚洲成色在线丨忘忧草社区www资源在线丨4567少妇伦理丨jzzjzzjzz亚洲成熟少妇

General industrial wastewater solutions

Most industrial wastewater has relatively simple composition, containing only a small amount of organic pollutants, and the treatment process is also relatively simple. Generally, only simple pretreatment (filtration, precipitation, pH adjustment, etc.) and biochemical treatment are needed. Some wastewater contains not only a small amount of organic pollutants but also a small amount of salt, which requires desalination. Generally, evaporation and membrane treatment processes are used, and the effluent can be discharged after biochemical treatment to meet standards or reused.