Wastewater zero discharge system of chlorine-alkali industry

Abstract

The invention discloses a wastewater zero discharge system of chlorine-alkali industry. The system includes a sodium hypochlorite wastewater treatment system, a centrifugal mother liquor treatment system, a comprehensive wastewater treatment system, a domestic sewage treatment system and a circulating water system. Well water is treated by a water desalination plant, and the generated desalinated water is transported to a caustic soda device and a PVC polymerization device to be used in production. One part of the concentrated saline water generated by the water desalination plant is used for an acetylene generator, and the other part is delivered into a dilute saline water trough and returned to a brine well so as to be used in brine mining. A production water station is mainly used for an acetylene purification device, the PVC polymerization generation device, the caustic soda device and an acetylene section alkali washing tower. The sodium hypochlorite wastewater discharged from the acetylene purification device is treated by the sodium hypochlorite wastewater treatment system to reach the standard, and is then returned to the saline well to be used for saline mining. The centrifugal mother liquor from the PVC polymerization generation device is treated by the centrifugal mother liquor treatment system to reach the standard, and is then returned to the circulating water system. The production wastewater from the PVC polymerization generation device and the production wastewater from the caustic soda device are treated by the comprehensive wastewater treatment system to reach the standard, and are then returned to the saline well to be used for dilute saline water saline mining.

Description

technical field [0001] The invention belongs to the problem of discharge and reuse of chlor-alkali industrial wastewater, and is applied to the treatment of chlor-alkali industrial wastewater to finally realize "zero discharge" of wastewater. Background technique [0002] The chlor-alkali industry is one of the most basic chemical industries. Chlor-alkali products such as polyvinyl chloride resin, caustic soda, hydrochloric acid, and liquid chlorine are all indispensable substances for the national economy and people's lives, and occupy an important position in the national economy and national defense construction. At the same time, the chlor-alkali industry also causes relatively large environmental pollution. As people's awareness of environmental protection increases, more and more attention is paid to the pollution caused by the chemical production process based on the chlor-alkali industry and the impact of its products on the environment. Therefore, while giving full...

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Problems solved by technology

[0004] In the chlor-alkali industry, the rainwater and domestic water in the factory area are directly discharged and not utilized, which is not conducive to energy saving and emission reduction

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