水处理是指为使水质达到一定使用标准而采取的物理、化学措施。饮用水的低标准由环保部门制定。工业用水有自己的要求。水的温度、颜色、透明度、气味、味道等物理特性是判断水质好坏的基本标准。水的化学特性，如其酸碱度、所溶解的固体物浓度和氧气含量等，也是判断水质的重要标准。

在生产过程中有以下行业水处理的直接案例：
（1）、电子工业用水：纯净水、蒸馏水、集成电路、硅晶片、显示管等电子元器件冲洗；
（2）、制药行业用水：大输液、针剂、片剂、生化成品、设备清洗等；
（3）、工行业工艺用水：化工循环水、化工产品制造等；
（4）、电力行业锅炉补给水：火力发电锅炉、厂矿中高压锅炉动力系统；
（5）、食品工业用水：饮用纯净水、饮料、啤酒、白酒、保健品等用水；
（6）、生活饮用水：桶装水、矿泉水、小区直饮水、学校直饮水；
（7）、其它工艺用水：造纸、电镀、印染汽车、家电涂装、镀膜玻璃、扮装品、精密化学品等。

Water treatment refers to physical and chemical measures taken to achieve a certain standard of use. The minimum standards for drinking water are set by the environmental protection department. Industrial water has its own requirements. The physical characteristics of water temperature, color, transparency, smell, taste and so on are the basic criteria for judging the quality of water. The chemical properties of water, such as its pH, dissolved solids and oxygen content, are also important criteria for determining water quality.

There are direct cases of water treatment in the following industries in the production process:
(1) Water for electronics industry: flushing of electronic components such as pure water, distilled water, integrated circuits, silicon wafers, display tubes, etc.
(2) Water for the pharmaceutical industry: large infusions, injections, tablets, biochemical products, equipment cleaning, etc.;
(3) Process water for industrial and industrial use: chemical circulating water, chemical product manufacturing, etc.;
(4) Boiler recharge water in power industry: thermal power generation boiler, medium and high pressure boiler power system of factory mine;
(5) Water for food industry: drinking pure water, beverages, beer, liquor, health care products, etc.;
(6) Drinking water: bottled water, mineral water, direct drinking water in the community, direct drinking water in schools;
(7), other process water: paper, electroplating, printing and dyeing cars, home appliance coating, coated glass, cosmetics, precision chemicals.