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Deep sewage treatment method and apparatus

A sewage treatment method and sewage treatment device technology, applied in biological water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of complex maintenance and management of facilities and high cost, and achieve easy Management, easy equipment, cost effective

Inactive Publication Date: 2007-08-29
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] As described in Figure Patent Document 1, the method of dosing in order to increase the ratio of T-BOD and T-N in the anaerobic tank is costly due to the purchase of input equipment or the cost of medicines
In addition, there is a problem that maintenance and management of facilities are complicated

Method used

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  • Deep sewage treatment method and apparatus
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Embodiment Construction

[0015] Next, an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows the equipment flow of the sewage treatment plant through the multi-stage nitrification and denitrification method of water inflow in stages. This sewage treatment plant is composed of initial sedimentation tank 1, reaction tank (anaerobic tank: 2, 4, aerobic tank: 3, 5), final sedimentation tank 6, primary sludge pump 7, return sludge pump 9, Excess sludge extraction pump 8, air blower 10,12, discharge valve 11,13 constitute.

[0016] The sewage flowing into the initial sedimentation tank 1 is separated from solid and liquid due to physical effects, and the settled sludge is drawn into the sludge treatment equipment by the primary sludge pump 7, while the above clarified liquid will pass through the anaerobic tank 2 and the anaerobic tank. The piping of the oxygen tank 4 is provided to each anaerobic tank.

[0017] In the anaerobic tank 2, the nitrate nitrogen...

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PUM

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Abstract

In this advanced sewage treatment by a step flowing-in type multistage nitrification denitrification method of dividing into non-oxygen tanks 2, 4 and aerobic tanks 3, 5, an amount of a part of initial settling sludge drawn out of an initial settling basin 1 of a sewage treatment plant to be charged to the non-oxygen tanks is controlled. That is, a predetermined ratio of total organic matter to total nitrogen, which indicates a reaction situation, is set as a target value, and an amount of charge of the initial settling sludge is controlled so that the ratio of the total organic matter to the total nitrogen based on actual measurement values of non-oxygen tanks becomes the target value. Accordidng to the invention, it maintains a high nitrogen removing rate while reducing cost for a chemical injection facility and maintenance and management.

Description

technical field [0001] The invention relates to an advanced sewage treatment method and device adopting a multi-stage nitrification and denitrification method of segmented water inflow, in particular to a primary sludge input method. Background technique [0002] Among the sewage treatment methods modified for the purpose of improving the denitrification ability of the activated sludge method, there is a step-inflow multi-stage nitrification denitrification method. In this treatment method, the inside of the reaction tank is divided into a plurality of tanks consisting of aerobic tanks containing a large amount of oxygen and anaerobic tanks containing no oxygen at all. oxygen. In the aerobic tank, through the activity of nitrifying bacteria, the ammoniacal nitrogen (NH 4 -N) oxidation to nitrite nitrogen or nitrate nitrogen (NOx-N). In the anaerobic tank, the oxidized nitrogen oxidized in the aerobic tank is reduced to nitrogen gas (N 2 ), whereby nitrogen is discharged ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/02C02F3/28C02F3/30C02F3/34C02F3/00
CPCY02W10/10
Inventor 菊地忠昭原直树
Owner HITACHI LTD
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