Device for treating kitchen wastewater

Abstract

The invention discloses a device for treating kitchen wastewater, and relates to a device for treating wastewater obtained after anaerobic digestion and dehydration are carried out on kitchen waste slurry. The device has the advantages that the wastewater is sequentially treated by an oil separation primary settling tank (1), a regulating tank (2), a first pH (potential of hydrogen) regulating tank (3), an ammonia stripping tower (4), a second pH regulating tank (5), an A / O (anaerobic / oxic) biochemical treatment device (6), a settling tank (7), a first coagulating settling tank (8), a Fenton reactor (9), a second coagulating settling tank (10) and an aeration biological filter tank (11), accordingly, requirements on removing pollutants such as COD (chemical oxygen demand), BOD<5> (biochemical oxygen demand <5>) and SS (suspended solids) in the wastewater can be met, TN (total nitrogen) and TP (total phosphorus) can be effectively removed, the chromaticity of the wastewater can be effectively lowered, and the TN and TP removal rates can be increased; requirements of 'primary standards' of the Comprehensive Wastewater Discharge Standards (GB8978-1996) on pollutants such as the COD, the BOD<5>, NH3-N and the TP in the treated wastewater and the chromaticity of the treated wastewater can be stably met, and the content of TN in the treated wastewater can be lower than 70 mg / L.

Description

technical field [0001] The invention belongs to a treatment device for kitchen waste slurry anaerobic digestion wastewater, in particular to a treatment device for waste water after anaerobic digestion and dehydration of kitchen waste slurry and waste water produced in other processes of kitchen waste treatment, belonging to sewage processing fields. Background technique [0002] Wastewater after anaerobic digestion and dehydration of food waste slurry, as well as waste water generated by other processes of food waste treatment, has complex components and is a high-concentration organic wastewater that is difficult to treat. The concentration of pollutants in wastewater is high, chemical oxygen demand (COD, 8000-20000mg / L), BOD 5 (4000~8000mg / L), total nitrogen (TN, 2000~3000mg / L), ammonia nitrogen (NH 3 -N, 1500~2500mg / L), total phosphorus (TP, 50~150mg / L), suspended solids (SS, >8000mg / L), salt content (15000~30000mg / L), animal and vegetable oil (800~1500mg / L), chro...

AI Technical Summary

Problems solved by technology

The waste water is treated successively through the adjustment tank of the oil separation primary sedimentation tank, the first pH adjustment tank, the ammonia stripping tower, the second pH adjustment tank, the A / O biochemical treatment device, the sedimentation tank, the Fenton reactor, and the coagulation sedimentation tank. In the removal of COD, BOD in wastewater 5 , SS and other pollutants at the same time, it can effectively remove TN, TP and effectively reduce the chroma of wastewater, and improve the removal rate of TN and TP. COD and BOD in the treated wastewater 5 , TN, NH 3 - N, TP, chroma and other pollutants can stably meet the "Comprehensive Discharge Standard for Sewage" (GB8978-1996) "Three-Class Standard" and "Water Quality Standard for Sewage Discharged into Urban Sewers" (GB / T 31962-2015) "B It has good effect, but it does not meet the requirements of "Class I Standard" of "Integrated Wastewater Discharge Standard" (GB8978-1996)

[0005] In the prior art, there is also a treatment device composed of "pretreatment device + anaerobic treatment device + aerobic treatment device + reverse osmosis membrane filtration device". High, especially the anaerobic treatment device consumes the carbon source in the wastewater during operation, which further reduces the carbon-nitrogen ratio in the wastewater (COD, BOD 5 lower ammonia nitrogen), the lower carbon-nitrogen ratio is not conducive to the biological denitrification of wastewater; the second is that the reverse osmosis membrane filtration device is used as the advanced treatment at the end, although it can meet the "B level" of the "Water Quality Standards for Sewage Discharge into Urban Sewers" The requirements of the standard and the "Class I Standard" of the "Comprehensive Wastewater Discharge Standard" (GB8978-1996) are insufficient. The grease in the wastewater can easily cause the reverse osmosis membrane to be blocked, and the high salt in the wastewater will accelerate the aging of the reverse osmosis membrane. The service life of the reverse osmosis membrane is short, especially the reverse osmosis membrane filtration device is a physical filtration device, which only intercepts the pollutants in the wastewater, but does not really degrade the pollutants. The large amount of concentrated liquid produced needs to be processed separately. The treatment of the process is easy to cause secondary pollution, and the operating cost is high

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