Aeration disc and gasification ash water comprehensive treatment device with same and treatment method

Abstract

The invention belongs to an aeration disc and a gasification ash water comprehensive treatment device with same and a treatment method. The gasification ash water comprehensive treatment device comprises a gasification ash water tank and a clarification tank, wherein the gasification ash water tank is connected with a hardness reduction tank through an alkali liquid premixing unit and a deamination tank; the supernate outlet in the upper part of the hardness reduction tank is connected with the clarification tank; the top of the deamination tank is connected with a torch device; the top of thehardness reduction tank communicates with a flocculant storage tank; the deamination tank and a solid-phase outlet in the bottom of the hardness reduction tank are respectively connected with a sludge treatment unit; the deamination tank communicates with the hardness reduction tank through a connecting pipeline; aeration discs are respectively arranged at the bottom of the deamination tank and the bottom of the hardness reduction tank; the aeration disc in the deamination tank is connected with a compressed air storage tank; and the aeration disc inside the hardness reduction tank is connected with a carbon dioxide storage tank. The gasification ash water comprehensive treatment device has the advantages that the procedures are reasonably designed, an ammonia nitrogen content of 50% anda total hardness content of 85% in gasification ash water can be effectively removed, scaling of gasification ash system equipment and pipelines can be effectively retarded, ammonia nitrogen accumulation of an ash water system can be reduced, and the burden of a sewage terminal can be reduced.

Description

technical field [0001] The invention belongs to an aeration pan, a gasification gray water comprehensive treatment device and a treatment method using the aeration pan. Background technique [0002] CWS gasification gray water is the water after multi-stage flash evaporation, flocculation and clarification of black water, which is rich in Ca 2+ , Mg 2+ ; In order to achieve the purpose of saving water resources, the gasification gray water recycling method is generally adopted, but due to the existence of a large amount of Ca 2+ and Mg 2+ , the total hardness of gasification gray water continues to increase after repeated use, resulting in an increased risk of scaling and blockage of equipment and pipelines. In order to improve the cycle time of gasification gray water, general enterprises use a large amount of scale inhibitor The method of dispersant is used to maintain the stable operation of the gasification gray water system; however, this kind of gasification gray wa...

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Problems solved by technology

[0002] CWS gasification gray water is the water after multi-stage flash evaporation, flocculation and clarification of black water, which is rich in Ca 2+ , Mg 2+ ; In order to achieve the purpose of saving water resources, the gasification gray water recycling method is generally adopted, but due to the existence of a large amount of Ca 2+ and Mg 2+ , the total hardness of gasification gray water continues to increase after repeated use, resulting in an increased risk of scaling and blockage of equipment and pipelines. In order to improve the cycle time of gasification gray water, general enterprises use a large amount of scale inhibitor The method of dispersant is used to maintain the stable operation of the gasification gray water system; however, this kind of gasification gray water has a high risk of scaling, and must be discharged after long-term use. The ammonia nitrogen content and total The hardness content is high, and it is easy to block the discharge pipeline, and it also increases the load on the sewage treatment terminal

[0003] At present, the conventional methods to reduce the hardness of gray water include: electrocoagulation method, ion exchange resin method, lime method, etc., all of which have the defect of high operation or maintenance costs; in addition, the accumulation of ammonia nitrogen in the gray water system will still cause the pH of the black / gray water system Therefore, the gasification gray water system needs to remove ammonia nitrogen at the same time as removing hardness and reducing turbidity, so as to achieve reuse of produced water and stable operation of the system the goal of

[0004] At present, the method of removing ammonia nitrogen content in the gray water system is to remove the ammonia nitrogen content of the gray water by stirring and aerating on the basis of hard removal, but this method can only remove 5%-10% of the ammonia nitrogen content, and the removal efficiency of the ammonia nitrogen content is low , can not solve the problem of black / gray water system pH increase, chilling chamber, heat exchanger and other equipment scaling; in addition, the process of removing ammonia nitrogen from sewage in the sewage treatment industry mainly includes stripping process and alkaline water washing process, However, since the gray water temperature is only 60-75°C, it is not suitable to use the stripping process; and the gray water system has a large amount of water and the ammonia nitrogen content is 400-600mg / L. The use of alkaline water washing process requires a special washing tower, which is generally suitable for ammonia nitrogen content of 5000- 20000mg / L shift condensate deammonization, high investment and operation and maintenance costs of alkaline water washing process equipment, not suitable for gasification gray water system

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