Magnetic flocculation separation waste water treatment technology

Abstract

The magnetically flocculating and separating waste water treating apparatus consists of mainly eddy flow well, static tubular mixer, magnetic separator, regulating pond, cooling tower, cooling pond and other parts. It has also chemical adding device before the magnetic separator for throwing flocculant and flocculant aid or complex flocculant, which is mixed into the waste water so as to demulsify oil in the waste water, combine oil and fine non-magnetic matter with flocculant. Through further magnetic separation, the purified water can reach SS less than 20 mg / l and oil less than 5mg / l, is colorless and transparent, and may be reused.

Description

Technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a process method for treating waste water by means of chemical flocculation and permanent magnetic separation. Background technique [0002] Wastewater produced in the production process of metallurgical, mining and other enterprises contains magnetic suspended solids and various oils to varying degrees. If not treated, it will cause environmental pollution and waste precious water resources. In order to solve this problem, traditional methods use swirl wells, advection or inclined plate sedimentation tanks, high-speed filters, cooling towers, cold water pools, and the final user recycling process. Precipitation improves the treatment effect. Traditional craft structures require large investment, occupy a lot of land, and the sludge is not easy to handle. Later, the rare earth permanent magnetic separation equipment was used to replace the advection tank or the ...

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Problems solved by technology

[0003] However, there are still some shortcomings in the above process: (1) The effluent water quality index of the magnetic separation equipment can only reach SS≤50mg / l, and the oil is less than 8-10mg / l. High-speed filtration must be set up in the follow-up to reduce the SS to about 20mg / l ; (2) Although non-magnetic substances can be removed through the effect of remanence, it is not thorough; (3) For wastewater containing chroma, it cannot be decolorized; (4) Can not handle dispersed oil and emulsified oil, magnetic separation equipment The oil content in the effluent does not meet the requirement of ≤5mg / l, resulting in an increase in the load on the subsequent high-speed filter

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