Device and method for controlling addition amount of mercury removal agent for mercury-containing wastewater treatment

Abstract

The invention discloses a device and method for controlling the addition amount of a mercury removal agent for mercury-containing wastewater treatment, and the device mainly comprises a neutralization reaction tank, one side of the neutralization reaction tank is provided with a waste acid liquid inlet and a waste alkali liquid inlet, the other side of the neutralization reaction tank is provided with a liquid outlet, and the liquid outlet is connected with the input end of an integrated mercury removal device through a pipeline and a pump body; a mercury removal agent adding opening and a motor are mounted above the neutralization reaction tank, and the motor is connected with a stirring assembly. According to the device and method for controlling the addition amount of the mercury removal agent for mercury-containing wastewater treatment, the addition amount of the mercury removal agent is reasonably controlled under the condition that the mercury content of mercury-containing wastewater is not analyzed, and the purpose of effective mercury removal is achieved.

Description

technical field [0001] The invention relates to a mercury removing device, in particular to a device and a method for controlling the added amount of mercury removing agent for mercury-containing wastewater treatment. Background technique [0002] Calcium carbide chlor-alkali enterprises use mercury chloride catalyst as a catalyst for vinyl chloride synthesis. During the production process, mercury-containing converter pumping catalyst wastewater, crude vinyl chloride purified water elution waste acid and alkali washing waste alkali, and mercury-related equipment maintenance will be generated. waste water. The "Caustic Soda and Polyvinyl Chloride Industrial Pollutant Discharge Standard" (GB15581-2016), promulgated and implemented in 2016, adjusted the total mercury emission limit in water pollutants from the original 0.005mg / L to 0.003mg / L, which further improved. Requirements for the treatment of mercury-containing wastewater. At present, most enterprises generally use a ...

AI Technical Summary

Problems solved by technology

In the actual production process, on the one hand, the mercury content in mercury-containing wastewater fluctuates, and the existing forms are HgCl 2 , Hg(OH) 2 , HgO, elemental mercury, etc., there is no suitable online instrument for real-time monitoring of various forms of mercury content, and it is impossible to provide accurate parameters for the amount of mercury removal agent; on the other hand, in an alkaline environment, ions in mercury-containing wastewater Most of the state mercury has been converted into slightly soluble Hg(OH) 2 , HgO, etc., slowing down the Hg 2+ with S 2- Combination is the reaction rate of HgS precipitation; moreover, industrial sodium sulfide contains impurities such as sodium carbonate and sodium sulfate, and HgS 2+ Generates basic mercury salt precipitation with relatively high solubility product, which affects mercury removal efficiency

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