Process and device for processing and recycling leaded wastewater

Abstract

The invention discloses a process for processing and recycling leaded wastewater. The process comprises a primary processing part and a deep processing part. The primary processing part is achieved through the chemical neutralization and sedimentation and the primary tubular membrane filtration. The deep processing part is achieved through the ultrafiltration and the secondary reverse osmosis concentration desalination, thick water processed through secondary reverse osmosis is filtered through the secondary tubular membrane filtration, and discharged clean water which is processed through the primary reverse osmosis, the secondary reverse osmosis and the secondary tubular membrane filtration is recycled. Tubular membrane filters are arranged at the water outlet end of a primary processing neutralizing tank and for thick water processing of a deep processing secondary reverse osmosis system, therefore, the occupied area is greatly narrowed, and the device is more compact and simple. The tubular membrane filters can intercept all particles with the diameter greater than 0.1 micrometer, therefore, small lead hydroxide flocs caused by the dosage deviation of a flocculating agent and flocs with the low settling velocity can be intercepted, the quality and the stability of the discharged water can be fully ensured, and the pollution hazards can be avoided.

Description

technical field [0001] The invention relates to the technical field of environmental protection water treatment, in particular to a process and equipment for the treatment and reuse of lead-containing wastewater. Background technique [0002] The production process of batteries will produce a large amount of high-concentration lead-containing wastewater, which poses a great threat to groundwater sources. If it is not treated and discharged, it will inevitably bring great harm to the environment and society. Both lead and soluble lead salts are toxic, and lead-containing wastewater has serious hazards to human health and animal and plant growth. If the daily intake of lead exceeds 0.3-1.0 mg, it can accumulate in the human body, causing anemia, neuritis, etc. Chemical precipitation is a widely used process for treating lead-containing wastewater, that is, adding alkaline neutralizer or sulfide to lead-containing wastewater to make lead ions react with hydroxyl or sulfide ions...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of the above-mentioned existing chemical precipitation method for removing lead ions, the discharge water quality is unstable, and there is a large potential pollution hazard, the applicant provides a process and equipment for the treatment and reuse of lead-containing wastewater with a reasonable structure, which can minimize The content of lead ions in the effluent ensures stable effluent quality

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