Method for treating high-salt, high-organic matter and high-hardness wastewater

Abstract

The invention discloses a method for treating high-salt, high-organic matter and high-hardness wastewater. The method comprises the following steps: performing advanced oxidation on the wastewater, performing coagulation sedimentation and ultrafiltration treatment sequentially, and then performing evaporation treatment so as to purify the wastewater. The method further includes the steps: performing reflux on the wastewater obtained after ultrafiltration treatment, mixing the reflux wastewater with the wastewater obtained after coagulation sedimentation, and then performing coagulation sedimentation. A device system for wastewater treatment includes an advanced oxidation reactor, a coagulation sedimentation tank, an ultrafiltration device and an evaporation device, and the device system further comprises a return pipeline which is disposed at the bottom of the ultrafiltration device; and the return pipeline is connected to the water inlet end of the coagulation sedimentation tank, and a sludge discharge pipeline is arranged at the bottom of the coagulation sedimentation tank. The organic matter and hardness can be reduced by using the effective method, an organic scale layer which is generated through evaporation is reduced, and stable and effective operation of evaporation is achieved; and the high-salt, high-organic matter and high-hardness wastewater can be treated stably and effectively, the water production rate is high, and the operation is stable.

Description

technical field [0001] The invention relates to a method for treating waste water with high salinity, high organic matter and high hardness, which belongs to the field of sewage treatment, in particular to the technical field of landfill leachate treatment. Background technique [0002] Landfill leachate concentrate is a kind of wastewater after the landfill leachate passes through the membrane concentrate during the treatment process. It has the characteristics of high salinity, high organic matter and high hardness. It is one of the difficulties and hotspots in domestic and foreign research. The diversity and high content of components make it difficult to treat. The most widely used treatment technology before is to deal with landfill, Sinotrans sewage treatment plant or evaporation. [0003] The Sinotrans sewage treatment plant also increases the burden on the sewage treatment plant and affects its normal operation. As the environmental protection department requires the...

AI Technical Summary

Problems solved by technology

Generally, due to the high organic matter and hardness of the incoming water, the evaporation device cannot operate continuously, and frequent cleaning is required.

The high content of organic matter increases the difficulty of cleaning, the evaporation water production rate is low, and the water quality is often difficult to meet the standard

[0006] In order to reduce the frequency of cleaning, some evaporation processes will add coagulation and sedimentation devices at the front end, but the effect is not ideal

The reason is that macromolecular organic matter will form an organic fouling layer during the evaporation process, which cannot be eliminated by conventional cleaning, and the cleaning cost will increase

Due to the increased difficulty of evaporation cleaning, the cleaning time is longer, and the effective working time of evaporation is reduced, which directly affects the efficiency of evaporation.

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