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EH-BFB biochemical denitrification dephosphorization technique

A technology for nitrogen and phosphorus removal and biological treatment, applied in chemical instruments and methods, multi-stage water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Remove and other problems to achieve the effect of solving the contradiction of mud age

Active Publication Date: 2009-02-04
北京环利科环境工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, there is a contradiction between nitrifying bacteria and phosphorus accumulating bacteria in the control of sludge age. If the sludge age is too high, it is not conducive to the removal of phosphorus; if the sludge age is too low, nitrifying bacteria cannot survive and excessive sludge will affect subsequent sludge treatment
In the same process, the denitrification effect is good, and the phosphorus content in the sewage is generally greater than 1.0mg / L. In order to meet the discharge standards, a first-level chemical phosphorus removal is required, and the amount of sludge increases, causing secondary pollution.

Method used

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  • EH-BFB biochemical denitrification dephosphorization technique
  • EH-BFB biochemical denitrification dephosphorization technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Test scale: Q=3.6m 3 / d.

[0054] 2. Analysis instruments and methods:

[0055] COD, BOD5, total alkalinity, SVI, SV, MLSS are all measured by national standard methods.

[0056] TN, NH 4 + -N, NO 3 - -N, NO 2 - -N and TP are measured by HANNA water quality analyzer.

[0057] The water temperature and DO are measured by JPB-607 dissolved oxygen meter.

[0058] pH value and ORP are measured with pHB-4pH meter.

[0059] 3. Test influent water quality: the sewage discharged from the Shangzhuang living quarter and the sewage discharged from the hot spring Taizhouwu area are the test raw water sources. The test results of the sewage raw water quality are shown in Table 1:

[0060] Table 1 Test raw water quality

[0061]

Item

COD

(mg / L)

BOD5

(mg / L)

TN

(mg / L)

NH 4 + -N

(mg / L)

TP

(mg / L)

SS

(mg / L)

Alkalinity

(mg / L)

Water temperature

°C

pH

Range

250-450

150-260

36-60 ...

Embodiment 2

[0073] 1. Test scale: Q=4000m 3 / d.

[0074] 2. Analysis instruments and methods:

[0075] COD, BOD5, total alkalinity, SVI, SV, MLSS all adopt national standards

[0076] Quasi-method determination.

[0077] TN, NH 4 + -N, NO 3 - -N, NO 2 --N and TP are measured by HANNA water quality analyzer.

[0078] Water temperature and DO are measured by JPB-607 dissolved oxygen meter.

[0079] The pH value and ORP are measured with a pHB-4pH meter.

[0080] 3. The sewage treatment method of the present invention was implemented in the engineering design and construction of the Taizhouwu sewage treatment plant in Wenquan Town, Haidian District. The test results of the raw sewage water quality are shown in Table 3:

[0081] Table 3 Test raw water quality

[0082]

Item

COD

(mg / L)

BOD 5

(mg / L)

TN

(mg / L)

NH 4 + -N

(mg / L)

TP

(mg / L)

SS

(mg / L)

Alkalinity

(mg / L)

Water temperature

°C

pH

Range

150-...

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PUM

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Abstract

The invention relates to a biological treatment method for removing nitrogen and phosphorus of sewage, and the biological treatment method comprises the processes of expansion hydrolysis, pre-denitrification reaction, aerobic reaction, sedimentation and separation, etc. A hydrolysis tank is utilized to replace a traditional tank during the expansion hydrolysis process, a pressure water distributor and a stirring device are further arranged, the biological treatment method does not only have good anaerobic environment and adequate retention time to ensure the phosphorus release, but can also more effectively convey phosphorus accumulating organisms after the full phosphorus release into the aerobic reaction to carry out the phosphorus absorption; suspended biological fillers are added during the aerobic reaction process for forming an aerobic biological fluidized bed, thereby fixing nitrifying bacteria and solving the sludge age contradiction for removing the nitrogen and the phosphorus; at the same time, the fillers form a plurality of micro-A / O nitrogen removal systems, thereby separating microbes with the different sludge ages and also maintaining the simple characteristic of the conventional A<2> / O technology; the biological treatment method does not use the chemical phosphorus removal method and only uses the biological treatment method for solving the contradiction for removing the nitrogen and the phosphorus in the traditional technology and simultaneously achieving the standards that TN is not more than 15mg / L and TP is not more than 0.5mg / L.

Description

Technical field [0001] The invention relates to a sewage treatment method, in particular to a biological treatment method mainly used for the removal of nitrogen and phosphorus from urban sewage or domestic sewage. Background technique [0002] At present, the surface water systems of rivers and lakes are seriously polluted, and large areas of "water bloom" often occur. This is directly related to the excessively high nitrogen and phosphorus content in the water body. The nitrogen and phosphorus elements flowing into the water body mainly come from untreated urban sewage and sewage without denitrification and phosphorus removal after treatment. [0003] The treatment objects of urban sewage treatment plants include COD (BOD5), SS and nutrients such as nitrogen and phosphorus. As far as nitrogen removal and phosphorus removal are concerned, there is a certain contradiction between the two due to the different requirements of the respective processes. Using conventional biological ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F1/52
Inventor 邹朝亮陈蓓
Owner 北京环利科环境工程技术有限公司
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