Wastewater zero-emission industrial sewage treatment system and treatment method

Abstract

The invention discloses a wastewater zero-emission industrial sewage treatment system and a wastewater zero-emission industrial sewage treatment method. The system comprises an adjustment tank used for gathering sewage. A pretreatment system mainly composed of a V-shaped filtering tank is connected after the adjustment tank. A first ultrafiltration + reverse osmosis system is connected after the pretreatment system. After a reverse osmosis unit of the first ultrafiltration + reverse osmosis system, a way of reverse osmosis concentrated water enters a biochemical treatment unit directly or indirectly connected with the concentrated water. After the biochemical treatment unit, outlet water is connected into a second ultrafiltration unit. After the first reverse osmosis unit, another way of diluted water is connected into a recycling water tank or is communicated with a recycling diluted water outlet pipe of the recycling water tank. Diluted liquid after a first frequent electrodialysis reversal system and a second frequent electrodialysis reversal system is returned to a water inlet of a monovalent-divalent separation nano-filtration device.

Description

Technical field [0001] The invention relates to a waste water "zero discharge" industrial sewage treatment system and treatment method, and belongs to the technical field of environmental protection water treatment. Background technique [0002] "Zero discharge" of sewage means that after reuse of industrial water, this part of the high salt content and pollutants is concentrated into sewage and all (over 99%) is recycled and reused, without any waste liquid discharged from the factory. Salts and pollutants in the water are concentrated and crystallized in solid form and discharged from the plant to the garbage treatment plant for landfill or recycled as useful chemical raw materials. [0003] The current zero-discharge sewage treatment technologies mainly include: pretreatment + ultrafiltration + reverse osmosis + multi-effect evaporation, see figure 1 As shown, the specific content is: [0004] After the biochemical treatment, each stream of influent first enters the water recycli...

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Problems solved by technology

[0016] The so-called "zero discharge" in the above-mentioned zero-discharge sewage treatment is not zero discharge in the true sense. It cannot realize the effective separation and utilization of various substances in the sewage; it just reuses the sewage, and the reused water Ions and solids are transformed into crystalline solids in the above process, which need to be safely landfilled as hazardous solid waste, requiring the construction of a high-investment hazardous solid waste landfill; in addition, a large-volume sewage temporary storage is also required Generally, the capacity of the sewage temporary storage pool needs to be hundreds of thousands or even nearly one million cubic meters, and the investment is hundreds of millions of yuan; and the secondary environmental pollution that may be caused by improper treatment of crystalline solids and the hidden environmental risks of the sewage temporary storage pool; this part of waste residue needs to be Safely landfill as hazardous waste; in addition, crystalline solids contain high concentrations of metal ions and organic matter. Once handled improperly, the toxic heavy metal ions contained in the buried solid matter will pollute our groundwater system once dissolved, so this This technology is only a "zero emission" technology at the economic level

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