Mercury removing process based on carrier-induced precipitate crystallization and for mercury-containing waste water from PVC (polyvinyl chloride) production utilizing calcium carbide process

Abstract

The invention discloses a mercury removing process based on carrier-induced precipitate crystallization and for mercury-containing waste water from PVC (polyvinyl chloride) production utilizing the calcium carbide process, and relates to the technical field of resources and environment-prevention and control of water pollution. A mercury removing process flow involves a precipitant and mercury-containing waste water, a neutralizing reaction pond, a fluidized bed carrier reactor, output water drainage and periodical discharge of large-particle carriers. The process has the characteristics of adoption of a small-sized precipitation reaction device, low water content of sediment, high mercury content, freeness from a flocculent, easiness in recovery and treatment, low mercury content of the output water, and the like. Moreover, a filter and a filtering process are omitted.

Description

[0001] technical field [0002] The invention relates to the technical field of resource and environment-water pollution prevention and control, in particular to a process for removing mercury from polyvinyl chloride mercury-containing wastewater based on a carrier-induced precipitation crystallization calcium carbide method. Background technique [0003] The current calcium carbide method mercury-containing wastewater treatment process is actually a traditional chemical precipitation process, which is not advanced enough in technology. After summary, it is found that the traditional chemical precipitation process generally has low treatment efficiency, high treatment cost, poor treatment effect, and poor treatment process. The problems that are long and unfavorable to resource recycling are mainly manifested in: slow precipitation reaction speed, large reactor volume; slow solid-liquid sedimentation and separation, large volume of sedimentation tank; high water content o...

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Problems solved by technology

[0005] The current calcium carbide method mercury-containing wastewater treatment process is actually a traditional chemical precipitation process, which is not advanced enough in technology. After summary, it is found that the traditional chemical precipitation process generally has low treatment efficiency, high treatment cost, poor treatment effect, and poor treatment process. The problems that are long and unfavorable to resource recycling are mainly manifested in: slow precipitation reaction speed, large reactor volume; slow solid-liquid sedimentation and separation, large volume of sedimentation tank; high water content of sludge (sediment), requiring complex sludge ( Sediment) dehydration treatment; at the same time, in some cases, the remaining sedimentation capacity of the effluent is also relatively large, and the effluent must be properly treated before it can flow through subsequent equipment such as filters, and the sedimentation product is difficult to recycle.

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