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Waste water treatment method

A technology of drainage treatment and carrier, applied in water/sewage treatment, water/sewage multi-stage treatment, biological water/sewage treatment, etc., can solve the problems of high operating cost and large equipment cost of membrane filtration equipment, and reduce equipment costs. cost, reduce operating costs

Inactive Publication Date: 2007-01-24
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

), since a high load can be added, the aeration tank can be miniaturized, but on the other hand, it produces fine sludge that does not settle and separate
The inventors of the present invention have proposed a wastewater treatment device and a wastewater treatment method that do not generate excess sludge by combining aerobic treatment using a carrier with a total oxidation tank and a separation membrane (for example, Patent Document 1). Due to the total amount of aerobically treated wastewater, there is a problem that the membrane filtration equipment becomes larger and the operating cost is very large.

Method used

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  • Waste water treatment method
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Examples

Experimental program
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Effect test

Embodiment 1

[0058] according to figure 1 The process represented, using a capacity of 800m 3 Activated sludge aeration tank with a capacity of 120m 3 Sedimentation tank with a capacity of 200m 3 The wastewater treatment device consisting of full oxidation tank and membrane filtration equipment implements BOD at 1,000mg / liter for 400m 3 / day of chemical wastewater treatment test. Sludge is returned from the settling tank so that the MLSS of the activated sludge aeration tank becomes about 3,000 mg / liter. The sludge settleability in the settling tank was good, the BOD of the treated water was 10 mg / liter or less, and the SS (suspended matter) was 10 mg / liter or less. In addition, in order to maintain a constant sludge interface in the sedimentation tank, a part of the sedimentation sludge is sent to the full oxidation tank (the flow rate at this time is about 10m 3 / day). The outside of the total oxidation tank is equipped with a membrane filtration device, which is made of polysulfon...

Embodiment 2

[0060] according to figure 1 The indicated flow, using a capacity of 120m 3 Activated sludge aeration tank, capacity 6m 3 Sedimentation tank with a capacity of 30m 3 Drainage treatment device composed of complete oxidation tank and mold filter equipment, implement BOD at 3,000mg / liter, 20m 3 / day of chemical wastewater treatment test. Sludge was returned from the settling tank so that the MLSS of the activated sludge aeration tank was about 3500 mg / liter. The sludge settleability in the settling tank was good, the BOD of the treated water was 10 mg / liter or less, and the SS was 10 mg / liter or less. In addition, in order to maintain a constant sludge interface in the sedimentation tank, a part of the sedimentation sludge is sent to the full oxidation tank (the flow rate at this time is about 3m 3 / day). The outside of the total oxidation tank is equipped with a membrane filtration device, which is made of polysulfone resin, equipped with a molecular weight of 13,000 and a ...

Embodiment 3

[0062] according to Figure 5 The flow represented, using a capacity of 160m 3 Carrier flow aeration tank with a capacity of 140m 3 Activated sludge aeration tank with a capacity of 120m 3 Sedimentation tank with a capacity of 60m 3 Drainage treatment device composed of full oxidation tank and mold filter equipment, implement BOD at 1,000mg / liter for 400m 3 / day of chemical wastewater treatment test. Most of the raw water is introduced into the carrier flow aeration tank, but in order to keep the sludge load of the activated sludge aeration tank at about 0.1kg-BOD / kg-MLSS·day, a part of the raw water is injected into the activated sludge aeration tank groove. Add 8m of acetalized polyvinyl alcohol-based gel (about 4mm in diameter) to the carrier flow aeration tank 3 . Sludge is returned from the settling tank so that the MLSS of the activated sludge aeration tank becomes about 3,000 mg / liter. The sludge settleability in the settling tank was good, the BOD of the treate...

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Abstract

A method of treatment of waste water includes a sludge flocculating step of obtaining a supernatant liquid by flocculating within a flocculation tank 4 the sludge having been treated within an activated sludge aeration tank 3 where the waste water and an activated sludge are brought into contact with each other in an aerobic condition, a sludge concentration retaining step of retaining a concentration of a sludge within the activated sludge aeration tank 3 at a predetermined value by returning portion of a sludge within the flocculation tank 4 to the activated sludge aeration tank 3, an excessive sludge complete oxidation step of maintaining an excessive sludge, which is the sludge supplied from the flocculation tank 4, but exclusive of that portion of the sludge returned from the flocculation tank 4, in a complete oxidation state in which a speed of propagation of the sludge and a speed of self-oxidation of the sludge within the complete oxidation tank 5 are held in equilibrium with each other; and an excessive sludge filtration step of filtering a waste water containing the sludge within the complete oxidation tank 5, through a separation membrane 6 having a pore size not larger than 5 mu m to thereby discharge a resultant filtrate in a quantity corresponding to an amount of a water component in the complete oxidation tank 5 increased.

Description

technical field [0001] The invention relates to a wastewater treatment method which discharges very little sludge and can reduce the equipment cost and operation cost of membrane filtration equipment. Background technique [0002] Conventionally, the activated sludge method has been mainly used for wastewater treatment. According to this activated sludge method, the activated sludge aeration tank is used to decompose the organic matter by contacting the drain water with the activated sludge (floc composed of aerobic microorganisms) under aerobic conditions, and then settle the sludge in the sedimentation tank. Obtain the supernatant. At this time, a part of the sludge is returned to the activated sludge aeration tank, and a part is discharged as excess sludge. This method can load 0.3 to 0.8 kg / m in BOD (biological oxygen demand). 3 - Stable operation is performed under conditions of about 1 day (for example, non-patent document 1), but the activated sludge aeration tank n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F11/02B01D63/02C02F3/08B01D61/14C02F1/44C02F3/10C02F9/00C02F11/06C02F11/12
CPCC02F11/121C02F3/1268C02F11/06C02F3/085C02F3/1221B01D61/145C02F1/444Y02W10/10C02F3/12
Inventor 藤井弘明三浦勤小林悟朗马场泰弘
Owner KURARAY CO LTD