Coking wastewater treatment system and method

Abstract

The invention discloses a coking wastewater treatment system and method. The system comprises a purification, concentration and separation system and an efficient evaporation and crystallization system; the purification, concentration and separation system comprises a cyclone, a flocculation softening tank, a buffer sedimentation tank, a multi-medium filter, an ultrafiltration device, a nanofiltration device and a reverse osmosis device; and the efficient evaporation and crystallization system comprises a preheater, an evaporative crystallization tower, a centrifugal machine, a vacuum pump, a compressor and a condenser. The invention further discloses a treatment method of the coking wastewater, organic and inorganic pollutants in the coking wastewater subjected to biochemical treatment are removed through the system and the method, high-purity sodium chloride and sodium sulfate are separated out, recycling of water resources is achieved, and wastewater resource recycling and zero emission are achieved.

Description

Technical field [0001] The present invention belongs to the technical field of wastewater treatment, and more particularly to a coking wastewater treatment system and method. Background technique [0002] my country's water resources lack, water pollution is serious as a problem that cannot be ignored. At the same time, there is a lot of wastewater treatment in the domestic industry, causing waste and severe pollution in water resources. my country 's coal resources are abundant, and the energy utilization rate of coal by using coal chemical technology. Among them, coal coking technology is a process of producing coke, gas, coal tar and recovery other chemical products by high temperature dry distillation, which requires a lot of water while producing a large amount of wastewater. In addition, most coal chemical companies in my country are lacking in water resources. Effective depth treatment, recycling of coking wastewater, not only reduce the burden on the company's water, but ...

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Problems solved by technology

At the same time, most of the current research on coking wastewater treatment methods focuses on the recycling of water resources, and the treatment process is relatively complicated.

At the same time, there are few recycling methods for the relatively high content of salt components contained in coking wastewater, which is likely to cause environmental burdens and waste of resources; at present, the recovery of concentrated wastewater salt mainly uses evaporative crystallization towers, but the existing evaporative crystallization towers It needs to be used in conjunction with a separate thermal evaporation technology, the equipment occupies a large area, and the investment cost is high. If the heating evaporation and concentration crystallization are integrated into one evaporation tower, the existing technology will inevitably cause heat exchange pipes or equipment in the tower However, when the spray crystallization technology in the tower is used, the flue gas and the waste water spray convective heat exchange, although the problem of scaling and corrosion can be avoided and the heat exchange efficiency can be improved, but additional equipment such as dust collectors need to be arranged at the air outlet. It is beneficial to the separation after crystallization recovery and affects the purity of crystallization

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