The important thermal power equipment for power plant operation is an industrial boiler, and water is an important medium for boiler heat conduction. Therefore, industrial boiler water treatment plays an important role in ensuring the efficiency, economy, safety, and operation of the boiler.

According to long-term practice, people realize that the quality of water steam in thermal systems of thermal power plants is one of the important factors affecting the safe and economic operation of thermal equipment (boilers, steam turbines). Natural water that has not been purified contains a lot of impurities, and this kind of water is not allowed to be included in the water vapor circulation system. In order to ensure the quality of water vapor in the thermal system, natural water that has not been purified must contain a lot of impurities, and this water is not allowed to enter the water vapor circulation system. Natural water is properly purified and the quality of water vapor in water and steam systems is strictly monitored.

Using qualified make-up water is a prerequisite for the safe, economical, reliable and stable operation of the boiler and the production of qualified steam and hot water. Poor quality will lead to incrustation, damage of the heated surface metal due to high temperature, the decrease of thermal efficiency, more frequent chemical cleaning and corrosion of boiler metal. Besides, steam azeotropy due to excessive salt content in boiler water will result in steam deterioration of quality. Therefore, the power industry's requirement for the quality of the effluent water for desalination is particularly important.

Reclaimed water is internationally recognized as the second source of water in cities. Reclaimed water can not only solve the impact of waste water on the urban environment, but also increase the total available amount of water resources, which is an important measure for enlarging urban water supply. At the same time, according to analysis, with the more and more reasonable water supply prices through gradual adjustment, the value advantage of reclaimed water as the second urban water source has become more prominent.

Water shortage in and around metropolis pose as a major social problem. Water shortage, especially during peak summer months, is evident in some urban areas; some local governments are increasingly adopting administrative measures to restrict water supply. In addition, the Ministry of Construction and various local government departments have successively launched various laws and regulations on the reuse of reclaimed water.

In most companies, there are reverse osmosis concentrated water, boiler drainage, circulating water drainage, and other high-salt miscellaneous water, which can still be further recycled. At the same time, in most regions, especially in Shandong, the salt limit in the emission standards is gradually set below 1600mg/L, so most enterprises need to control the total salt content of the discharged water. However, the concentrated waste water contains the most salt, and the high-salt concentrated liquid is consumed and processed by the enterprise according to actual conditions.

Zero discharge means that through scientific treatment, the whole plant's waste water can be reused after it becomes fresh water. Zero discharge mainly depends on the biochemical treatment of terminal waste water, and then the general technology of the double membrane method is used for desalination treatment. After treatment, it is returned to the production system for utilization.

As for zero discharge, as far as its content is concerned, on the one hand, it is necessary to control the waste emissions generated during the production process and reduce them to zero; On the other hand, it is important to make full use of the waste that has been discharged and ultimately eliminate the existence of non-renewable resources and energy. In terms of its process, it means that the waste discharged during the production of one industry is turned into the raw material or fuel of another industry, and the related industries are formed into an industrial ecosystem through recycling. Technically, in the industrial production process, the transformation of energy, energy, and resources all follows certain natural laws. It is impossible to achieve 100% of the transformation of resources into various kinds of energy, the mutual transformation of various kinds of energy, and the conversion of raw materials into products.

According to the law of conservation of energy and the law of material immortality, the lost part is finally discharged into the environment in the form of water, gas, sound, slag, heat, etc. Since China started late in environmental protection, with the current technology and economic conditions, it is really difficult to reduce waste to zero as a last resort. For some enterprises have achieved the so-called "zero discharge" by making full use of the waste they have discharged, they have only changed the way, channels and nodes of pollutant discharge, some of which will eventually enter the environment In this sense, true "zero discharge" is just a theoretical and ideal state.

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