A biochemical sewage treatment process

Abstract

The invention relates to a biochemical sewage treatment process. Compared with all traditional processes, the process adopts reverse circulation mixing in a biochemical treatment tank (1) and has a higher circulation ratio. Limited dissolved oxygen is controlled in the main aeration zone (6), and the sewage inlet mixing point (4) of the main aeration zone is set on the other side of the biochemical reaction tank (1) away from the gas lift (2). The mixed liquor is recycled back to the main aeration zone (6) through the sludge stabilization zone (channel), and the sludge stabilization zone (channel) is equipped with a clarification unit (3) for clarifying the effluent (5). In the present invention, the dissolved oxygen concentration of the mixed solution after the gas stripping (2) is increased, so that the activated sludge obtains an additional stabilization process, and continuously improves the sewage treatment capacity, especially the degradation of refractory biochemical substances and nitrogen-containing substances in the effluent minimum, and excess sludge reduction.

Description

technical field

[0001] The invention relates to a biochemical sewage treatment process, which is applied to the field of advanced biochemical water treatment. Compared with the prior art, the present invention especially relates to increasing the circulation of substances in the biochemical treatment pond, and adopting a new circulation direction and method. Background technique

[0002] Over the past few decades, the classic biochemical water treatment process has been continuously improved. At present, the classic biochemical water treatment process usually includes a primary settling tank, an activated sludge biochemical treatment tank, and a secondary settling tank, wherein the sludge from the secondary settling tank flows back to the biochemical treatment tank. For example, the AO or AAO process adopts 2-level or 3-level biochemical treatment (anaerobic, anoxic, aerobic), or SBR process, which are current international conventional technologies. In order to better pro...

Examples

specific Embodiment example 1

[0042] Concrete implementation example 1, the present invention provides a kind of biochemical sewage treatment process, and its realization method comprises the following steps: (1) sewage is through pretreatment (grid, grit chamber), removes larger suspended matter and grit, then enters this The unit described in the invention—the biochemical pool, the influent water quality requirement TCOD: TN>4; (2) In the biochemical pool, the concentration of activated sludge is 8000 mg / L, and the sewage degrades COD, ammonia nitrogen, Nitrate nitrogen, the effluent in the final clarification area meets the requirements of surface water type IV water body, COD3 , the treated water volume is 8000m 3 / d, where the main aeration zone is 70m x 8m x 6m (length x width x height), the clarification zone is 70m x 4m x5m (length x width x height), and the sludge stabilization zone (channel) is below the clarification zone. Located on one side of the clarification zone, the size of the airlift zo...

specific Embodiment example 2

[0043] Concrete implementation case 2, the present invention provides a kind of biochemical sewage treatment process, and its realization mode comprises the following steps: (1) water intake 100m 3 / d, due to the large fluctuation of water inflow in the morning, noon and evening every day, a regulating pool of 40m is installed 3 , the residence time of the regulating pond is 10 hours, which is used to balance the water volume and water quality, and at the same time, the larger particles and sediment in the regulating pond are separated, and the cleaning period of the regulating pond is 3 years; (2) The regulating pond is equipped with a submersible pump Q=4m 3 / h, head 15m, evenly enters the biochemical treatment pool, and the effluent meets the requirements of the fourth category of surface water, that is, COD<20mg / L, TN<1.5mg / L; (3) The biochemical treatment pool is 12m long and is divided into two parts in the width range There are two main units: the main aeration area and...

technical field

[0001] The invention relates to a biochemical sewage treatment process, which is applied to the field of advanced biochemical water treatment. Compared with the prior art, the present invention especially relates to increasing the circulation of substances in the biochemical treatment pond, and adopting a new circulation direction and method. Background technique

[0002] Over the past few decades, the classic biochemical water treatment process has been continuously improved. At present, the classic biochemical water treatment process usually includes a primary settling tank, an activated sludge biochemical treatment tank, and a secondary settling tank, wherein the sludge from the secondary settling tank flows back to the biochemical treatment tank. For example, the AO or AAO process adopts 2-level or 3-level biochemical treatment (anaerobic, anoxic, aerobic), or SBR process, which are current international conventional technologies. In order to better pro...

Examples

specific Embodiment example 1

[0042] Concrete implementation example 1, the present invention provides a kind of biochemical sewage treatment process, and its realization method comprises the following steps: (1) sewage is through pretreatment (grid, grit chamber), removes larger suspended matter and grit, then enters this The unit described in the invention—the biochemical pool, the influent water quality requirement TCOD: TN>4; (2) In the biochemical pool, the concentration of activated sludge is 8000 mg / L, and the sewage degrades COD, ammonia nitrogen, Nitrate nitrogen, the effluent in the final clarification area meets the requirements of surface water type IV water body, COD3 , the treated water volume is 8000m 3 / d, where the main aeration zone is 70m x 8m x 6m (length x width x height), the clarification zone is 70m x 4m x5m (length x width x height), and the sludge stabilization zone (channel) is below the clarification zone. Located on one side of the clarification zone, the size of the airlift zo...

specific Embodiment example 2

[0043] Concrete implementation case 2, the present invention provides a kind of biochemical sewage treatment process, and its realization mode comprises the following steps: (1) water intake 100m 3 / d, due to the large fluctuation of water inflow in the morning, noon and evening every day, a regulating pool of 40m is installed 3 , the residence time of the regulating pond is 10 hours, which is used to balance the water volume and water quality, and at the same time, the larger particles and sediment in the regulating pond are separated, and the cleaning period of the regulating pond is 3 years; (2) The regulating pond is equipped with a submersible pump Q=4m 3 / h, head 15m, evenly enters the biochemical treatment pool, and the effluent meets the requirements of the fourth category of surface water, that is, COD<20mg / L, TN<1.5mg / L; (3) The biochemical treatment pool is 12m long and is divided into two parts in the width range There are two main units: the main aeration area and...

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