Near-zero emission system for deep treatment of coking strong brine

Abstract

The invention discloses a near-zero emission system for deep treatment of coking strong brine. The near-zero emission system comprises an adjusting tank system, a DTRO pretreatment system, a filter, a DTRO membrane concentration system, a water production tank, a concentrated water tank, an evaporation pretreatment system, an evaporation crystallization system, a mother liquor drying system, a sludge temporary storage tank, a sludge concentration tank and a sludge treatment system, wherein the adjusting tank system, the DTRO pretreatment system, the filter, the DTRO membrane concentration system, the concentrated water tank, the evaporation pretreatment system, the evaporation crystallization system and the mother liquor drying system are communicated in sequence; the DTRO pretreatment system and the evaporation pretreatment system are both communicated with the sludge temporary storage tank; the sludge temporary storage tank, the sludge concentration tank and the sludge treatment system are communicated in sequence; and the filter and the sludge concentration tank are both communicated with the adjusting tank system.

Description

technical field [0001] The invention relates to the technical field of coking wastewater treatment systems, in particular to a near-zero discharge system for advanced treatment of coking concentrated brine. Background technique [0002] The composition of coking wastewater is complex, containing pollutants such as phenols, polycyclic aromatic compounds and heterocyclic compounds of nitrogen, oxygen and sulfur. It is a typical refractory organic compound, high concentration, high pollution, toxic and difficult to treat. Industrial wastewater contains a large amount of organic and inorganic harmful substances that are harmful to the human body and pollute the environment. At present, most enterprises adopt the treatment process of "biochemical treatment + advanced treatment". After treatment, the water produced by the system is used for reuse, and the recovery rate is generally about 70%. The concentrated water produced by the system is used for coke quenching and blast furnac...

AI Technical Summary

Problems solved by technology

[0007] The main problems in this patented zero-discharge system are as follows: (1) The coking wastewater after biochemical treatment adopts advanced membrane separation technology for ammonia nitrogen removal, only ammonia nitrogen in the wastewater is removed, and other pollutants such as organic matter and COD are not removed; (2) ) membrane concentrated water is used as quenching water, which does not really achieve zero discharge

Existing problems include: (1) COD content in coking wastewater is high, common nanofiltration membranes are seriously polluted, and the washing frequency is high, resulting in a significant reduction in membrane life; (2) The concentration factor of nanofiltration membranes is low, resulting in large evaporation loads and high costs; ( 3) Due to the complex composition of coking wastewater, the product salt obtained by nanofiltration and evaporation is not high in purity, and its market value is not high

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