Anaerobic digestion based wastewater treatment device for kitchen waste

Abstract

The invention provides an anaerobic digestion based wastewater treatment device for kitchen waste and relates to a wastewater treatment device for kitchen waste slurry after anaerobic digestion and dehydration. Wastewater is treated by an oil separation and primary sedimentation tank (1), a regulation tank (2), a first pH regulation tank (3), an ammonia stripping tower (4), a second pH regulation tank (5), an A/O biochemical treatment device (6), a sedimentation tank (7), an air floatation device (8), a Fenton reactor (9), a coagulative precipitation tank (10) and a biological aerated filter (11) in sequence, pollutants such as COD (chemical oxygen demand), BOD5, SS (suspended solids) and the like in the wastewater are removed effectively, TN (total nitrogen) and TP (phosphorus) can be removed effectively, chroma of the wastewater can be reduced effectively, the TN and TP removal rate is increased, the content of the pollutants such as the COD, BOD5, NH3-N, TP and the like as well as the chroma of the treated wastewater can stably meet requirements of primary standards of Integrated wastewater discharge standard (GB8978-1996), and the content of TN is smaller 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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