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Device and method for processing domestic wastewater by means of A2O and submerged biological filter

A biofilter and domestic sewage technology, applied in the A2O+ submerged biofilter coupling biological treatment process device, sewage biochemical treatment device, new construction and upgrading of sewage treatment plants, can solve the problem that the anaerobic section of phosphorus accumulating bacteria cannot Fully release phosphorus, increase the operating cost of sewage treatment plants, obtain nitrogen and phosphorus removal at the same time, achieve the effect of saving aeration energy consumption, realizing carbon source and aeration volume, and high treatment efficiency

Active Publication Date: 2014-01-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low C / N value of domestic sewage in my country, it is difficult to meet the standard treatment. The best solution is to add a large amount of additional carbon source, but this will undoubtedly increase the operating cost of the sewage treatment plant, plus The large amount of excess sludge produced by the activated sludge process has also caused significant environmental problems.
[0003] A 2 O, as the simplest simultaneous denitrification and phosphorus removal process, is widely used in domestic and foreign large-scale sewage treatment plants, however, A 2 The inherent shortcoming of the O process is that there are contradictions between nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria in terms of sludge age, carbon source demand, and the impact of nitrate carried in returning sludge on anaerobic phosphorus release by phosphorus accumulating bacteria. Efficient denitrification It is difficult to obtain phosphorus removal in the same system at the same time, and the nitrate nitrogen carried in the aerobic effluent is easy to denitrify in the secondary sedimentation tank, causing the sludge to float up and affecting the stable operation of the system
Especially when treating low C / N domestic sewage, the anaerobic section of phosphorus accumulating bacteria cannot fully release phosphorus, the efficiency of nitrifying bacteria is low, and the lack of carbon source makes A 2 The existing problems in the O nitrogen and phosphorus removal process are more prominent

Method used

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  • Device and method for processing domestic wastewater by means of A2O and submerged biological filter

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Experimental program
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Effect test

Embodiment 1

[0039] Use this device to treat the actual domestic sewage with water quality characteristics: COD=100-300mg / L, TN=50-80mg / L, TP=3-7mg / L, the treatment capacity Q=5L / h, A 2 The O reaction pool mainly realizes the denitrification phosphorus removal reaction with nitrate nitrogen as the electron acceptor. The dissolved oxygen in the aerobic zone is controlled at 1.0-2.5mg / L, and the dissolved oxygen in the submerged biofilter is controlled at 3.5-4.5mg / L. L, realize the whole process of nitrification. A 2 The volume ratio of the anaerobic zone, anoxic zone and aerobic zone in the O reaction tank is 1:3:1, the sludge concentration in the anaerobic zone is maintained at 4000-5000mg / L, the hydraulic retention time is 10h, and the sludge reflux ratio is 100%; the filling rate of suspended filler in the submerged biological filter is 45%, the residence time is 1.8h, and the reflux ratio of nitrifying liquid is 300%. The effluent COD is within 50mg / L, and the effluent NH 4 + -N is...

Embodiment 2

[0041] Use this device to treat the actual domestic sewage with water quality characteristics: COD=100-300mg / L, TN=50-80mg / L, TP=3-7mg / L, the treatment capacity Q=5L / h, A 2 The O reaction pool mainly realizes the denitrification and phosphorus removal reaction using the mixture of nitrite nitrogen and nitrate nitrogen as the electron acceptor. The dissolved oxygen in the aerobic zone is controlled at 1.0-2.5mg / L. Dissolved oxygen in one chamber is controlled at 3.5-4.5mg / L, gradually decreasing to 2.5-3.5mg / L, 1.5-2.5mg / L, 0.5-1.5mg / L, realizing partial short-range nitrification and partial full-process nitrification. A 2 The volume ratio of the anaerobic zone, anoxic zone and aerobic zone in the O reaction tank is 1:3:1, the sludge concentration in the anaerobic zone is maintained at 4000-5000mg / L, the hydraulic retention time is 10h, and the sludge reflux ratio is 100%; the filling rate of suspended filler in the submerged biological filter is 45%, the residence time is 1.8...

Embodiment 3

[0043] Use this device to treat the actual domestic sewage with water quality characteristics: COD=100-300mg / L, TN=50-80mg / L, TP=3-7mg / L, the treatment capacity Q=5L / h, A 2 The O reaction pool mainly realizes the denitrification phosphorus removal reaction with nitrite nitrogen as the electron acceptor. The dissolved oxygen in the aerobic zone is controlled at 1.0-2.5mg / L, and the dissolved oxygen in the submerged biological filter is controlled at 0.5-2.0mg. / L to achieve short-cut nitrification. A 2 The volume ratio of the anaerobic zone, anoxic zone and aerobic zone in the O reaction tank is 1:3:1, the sludge concentration in the anaerobic zone is maintained at 4000-5000mg / L, the hydraulic retention time is 10h, and the sludge reflux ratio is 100%; the filling rate of suspended filler in the submerged biological filter is 45%, the residence time is 1.8h, and the reflux ratio of nitrifying liquid is 300%. The effluent COD is within 50mg / L, and the effluent NH 4 + -N is w...

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Abstract

The invention discloses a device and method for processing domestic wastewater by means of an A2O and submerged biological filter, and belongs to the field of wastewater processing. A water inlet pipe and a sludge return pipe of the device are respectively connected to the bottom of an A2O reaction basin anaerobic zone. A nitration liquid storage basin is connected with a second lattice chamber of a reaction basin, namely a first lattice of the anaerobic zone, through a nitration liquid return pipe. An A2O reaction basin aerobic zone is connected with a middle sedimentation basin through a first water outlet pipe. The middle sedimentation basin is connected with a first lattice chamber of the submerged biological filter through a water inlet pipe of the submerged biological filter. The submerged biological filter is connected with a secondary sedimentation basin through a second water outlet pipe. The secondary sedimentation basin is connected with the nitration liquid storage basin through a third water outlet pipe. The method comprises the steps of achieving wastewater denitrification nitrogen and phosphorus removal to remove organic matter through the A2O reaction basin, conducting ammonia nitrogen oxidation through the biological filter, providing an electronic acceptor for a denitrification nitrogen and phosphorus removal reaction in the reaction basin, and completing efficient removal of the organic matter, nitrogen and phosphorus. The device and method for processing the domestic wastewater by means of the A2O submerged biological filter have the advantages of having the efficient, energy-saving and stable nitrogen and phosphorus removal effect and reducing sludge.

Description

technical field [0001] The invention relates to a sewage biochemical treatment device and method, belonging to the technical field of sewage biological treatment, in particular to A 2 The device and method for coupling the O+ submerged biological filter to the biological treatment process are especially suitable for the new construction of domestic sewage treatment plants and the upgrading and transformation of sewage treatment plants. Background technique [0002] Controlling and treating eutrophication of water bodies is a very difficult and costly problem worldwide. Human beings have reached a consensus on the root cause of eutrophication in water bodies, that is, excessive discharge of nutrients such as nitrogen and phosphorus is the most critical factor. Therefore, only by cutting off the source of pollution can we eradicate eutrophication and achieve sustainable economic and social development. At the same time, it is necessary to strengthen the compliance rate of the...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 王淑莹王聪张淼彭永臻
Owner BEIJING UNIV OF TECH
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