water treatment

Industrial water plays a very important role in the whole national industrial system. At present, industrial water use accounts for about 80% of urban water use. Among them, the amount of cooling water in industrial water is the first, generally more than 60%. Industrial water-saving is an important link in protecting water resources. Water-saving should start with industrial water. Cooling water has become the primary goal. The main way to save cooling water is to adopt circulating cooling method and increase the concentration multiple.

From the point of view of water treatment, water is a renewable resource. Wastewater usually contains harmful toxins, bacteria, oils, oils, heavy metals, impurities from drugs, nutrients, viruses and other impurities. If sewage/wastewater is discharged directly into the natural environment, these pollutants will disrupt the ecosystem and life cycle. To remove all pollutants from wastewater, several separate wastewater treatment methods need to be combined to achieve layer-by-layer purification and step-by-step filtration until the pollutants in the water are completely removed. A complete and efficient sewage treatment system can be divided into three levels: primary treatment, secondary treatment and tertiary treatment.

The development of seawater desalination began in the 1960s. After decades of development, the technology of seawater desalination has been relatively mature. Among them, distillation and membrane methods have become the mainstream technologies. At present, distillation still dominates the whole desalination market in the world, but its development speed lags behind reverse osmosis.

Distillation refers to the use of thermal energy for desalination of seawater, including multi-stage flash (MSF), multi-effect evaporation (MED), pressure vapor distillation (VC) and so on. Membrane method mainly uses selective permeability of membrane to separate brine for desalination purposes, including reverse osmosis (RO) and electrodialysis (ED). The industrial operation of seawater desalination is generally higher than the cost of conventional water resources development and utilization. The cost of desalination includes energy cost, pharmaceutical cost, equipment cost and management cost. In the future, with the increasing share of seawater desalination in human production and domestic water, the demand of water treatment agents in the field of seawater desalination will continue to increase.

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