Device and method for adsorbing and pretreating coal gasification wastewater by residual sludge and application of device and method

Abstract

The invention discloses a device and a method for adsorbing and pretreating coal gasification wastewater by residual sludge and application. The device comprises a shell, wherein an adsorption sedimentation area and a sludge concentration area which are arranged up and down are defined in the shell; the adsorption reactor is arranged in the shell, a muddy water outlet is formed in the upper part of the adsorption reactor, a water and mud inlet is formed in the lower part of the adsorption reactor, and the adsorption reactor divides the adsorption settlement area into an adsorption area and a settlement area; the shell is communicated with the water outlet weir through a water outlet; the partition plate is arranged in the adsorption settling area, abuts against the top wall of the shell, the side wall of the shell and the outer wall of the adsorption reactor and divides the settling area into a first settling area and a second settling area, and only the bottoms of the first settling area and the second settling area are communicated. The device not only can realize the recycling of the waste residual sludge and reduce the treatment cost of the wastewater, but also can greatly reduce the concentration of organic matters in the wastewater and improve the biodegradability of the wastewater, and in addition, the device also has the advantages of simple structure, high treatment efficiency and easiness in operation.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a device, method and application for pretreating coal gasification waste water by adsorption of excess sludge. Background technique [0002] Coal gasification technology is a technology that converts coal into gaseous clean energy under the action of a gasification agent. This technology is widely used in the clean development of modern coal chemical industry. However, during the coal gasification process, a large amount of high-concentration organic wastewater is produced due to the cooling and washing of high-temperature gas, which has become one of the important environmental protection problems hindering the development of modern coal chemical industry. [0003] There are many types of coal gasification wastewater. Due to the different types of wastewater generated, the difficulty of wastewater treatment is also different. The most difficult to treat is the wast...

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Problems solved by technology

However, during the coal gasification process, a large amount of high-concentration organic wastewater is produced due to the cooling and washing of high-temperature gas, which has become one of the important environmental protection problems hindering the development of modern coal chemical industry.

[0003] There are many types of coal gasification wastewater. Due to the different types of wastewater generated, the difficulty of wastewater treatment is also different. The most difficult to treat is the wastewater generated by the fixed-bed Lurgi gasifier process. It not only has a high concentration of organic pollutants , the wastewater COD after phenol ammonia recovery and pretreatment still reaches 3000-6000mg / L, and the composition of organic pollutants is complex, containing a large number of phenolic compounds, benzene series, nitrogen-containing heterocycles, polycyclic aromatic hydrocarbons and long-chain alkanes, etc.; In addition, the biodegradability of wastewater is also poor, and the biochemical index (BOD 5 / COD) is only 0.3-0.4, which belongs to refractory wastewater, and it is difficult to treat the wastewater stably and efficiently only by relying on traditional anaerobic-aerobic biochemical process

Therefore, the process of treating coal gasification wastewater still needs to be further improved

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