Treatment device and method for mercury-containing wastewater in chlor-alkali industry

Abstract

The invention relates to a treatment device and a method for mercury-containing wastewater in the chlor-alkali industry. The treatment device comprises a grid tank 1, an adjusting tank 2, a first-order reaction tank 3, a second-order reaction tank 4, a settling pond 5, a disinfecting tank 6 and a sludge tank 7 which are connected in series in sequence, and further comprises a nano zero-valent iron preparation tank 8, wherein the nano zero-valent iron preparation tank 8 is connected with the first-order reaction tank 3 and the second-order reaction tank 4 through pipelines respectively; a coagulant preparation tank 9 and a tank type filter 11 are connected with a sterilization tank 6 through a pipeline mixer 13; the tank type filter 11 is connected with a storage tank 12 later. A materialization treatment process is adopted, so that the heavy metal mercury in wastewater can be efficiently removed, and stable up-to-standard emission can be achieved; the treatment device is good in impact resistance, so that variation of water amounts and water quality can be adapted; due to concentrated control and automatic operation, the treatment device is easy to manage; the mercury-containing wastewater can be economically and efficiently treated to meet the standard, and the purposes of energy conservation, consumption reduction and emission reduction can be met.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a treatment device and method for mercury-containing wastewater in the chlor-alkali industry. Background technique [0002] The chlor-alkali industry is an important chemical production field in my country. Its products involve almost all fields of the national economy and people's lives. However, there are chemical products related to mercury in the production process. Due to the poor management and use of mercury, it has caused damage to the external environment. Mercury pollution has caused great harm to people's health and natural ecology. For example: in the process of producing chlor-alkali by the mercury caustic soda method, due to the limitation of the production process, a large amount of mercury-containing wastewater and mercury-containing salt mud will be produced. Although my country has eliminated the mercury caustic soda process i...

AI Technical Summary

Problems solved by technology

The operating cost of the device is high, and the overall efficiency of treating mercury-containing wastewater is low

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