Method and system for treating phenol-ammonia wastewater

Abstract

The invention relates to a method and system for treating phenol-ammonia wastewater, and the method comprises the following steps: adding an oil removal agent into the phenol-ammonia wastewater to obtain pretreated oil-removed wastewater, further performing deamination treatment on the oil-removed wastewater to obtain deaminated wastewater, and then introducing the obtained deaminated wastewater into an evaporation device to perform dephenolization treatment to obtain dephenolized and deaminated wastewater; and finally, filtering the dephenolized and deaminized wastewater to obtain purified water meeting reuse requirements, wherein ammonia gas, coal tar and sodium phenolate are byproducts at the same time, the reuse cost is low, and the COD content, the ammonia nitrogen content, the totalphenol content and the oil content in reuse water are all low.

Description

technical field [0001] The present disclosure relates to the field of coal chemical industry, in particular to a method and system for treating phenolic ammonia wastewater. Background technique [0002] Phenol-ammonia wastewater is a kind of highly polluting and highly toxic industrial wastewater containing both phenol and ammonia produced during the coal separation and utilization process. Especially in the process of comprehensive utilization of low-rank coal, because the moisture content of low-rank coal is as high as 17-20%, the waste water generated in the processing process is relatively large, and can enter the downstream with coal tar, raw gas, semi-coal and other products, affecting The normal production of the device caused serious environmental pollution at the same time. [0003] The prior art has the following disadvantages: 1. The coal tar in the waste water is difficult to remove and recycle; 2. The operating cost of the waste water produced by the comprehens...

AI Technical Summary

Problems solved by technology

Especially in the process of comprehensive utilization of low-rank coal, because the moisture content of low-rank coal is as high as 17-20%, the wastewater generated during its processing is relatively large, and may enter downstream with coal tar, raw gas, semi-coal and other products, affecting The device is in normal production while causing serious environmental pollution

[0003] The prior art has the following disadvantages: 1. The coal tar in the waste water is difficult to remove and recycle; 2. The operating cost of the waste water produced by the comprehensive utilization of low-rank coal is high; 3. The resistance drop in the waste water concentration process system is high and the separation efficiency is low , The anti-particle performance is small; 4. The system is often scaled, and the system needs to be descaled frequently

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