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Sewage deep purification method

A technology for deep purification and sewage, which is applied in the direction of chemical instruments and methods, separation methods, water/sewage multi-stage treatment, etc. It can solve the problems of large floor area, high operating costs, and inability to achieve low operating costs and high water output. The effect of high water quality and less land occupation

Pending Publication Date: 2019-06-14
DAYUAN ENVIRONMENTAL TECH XIAMEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two processes not only occupy a large area, require a lot of investment and high operating costs, but also the discharged water after treatment can only reach the first-class A standard effluent index of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002). It cannot meet the relevant water quality standards of the "Surface Water Environmental Quality Standards" (GB3838-2002). If it is to meet the relevant water quality standards of the "Surface Water Environmental Quality Standards" (GB3838-2002), advanced treatment is required. Therefore, an economical water treatment system is urgently needed. Practical method for advanced sewage treatment and recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment one, with reference to figure 1 , the embodiment of a certain sewage treatment plant, the influent water quality index of described sewage is as table 2.

[0034] Table 2. Influent water quality indicators of a sewage treatment plant

[0035] serial number

Basic Control Items

Measured value (mg / L)

1

COD

400

2

BOD

180

3

SS

300

4

animal and vegetable oil

-

5

Petro

-

6

anionic surfactant

7

Total Nitrogen (as N)

55

8

Ammonia nitrogen (as N)

40

9

Total phosphorus (calculated as P)

7

10

Chroma (dilution factor)

11

pH

6-9

[0036] use figure 1 The deep purification and recycling process of sewage based on A2O and plasma technology, the steps are as follows:

[0037] 1. Primary treatment

[0038] After the sewage is collected, it is filtered through coarse and fine screens, and th...

Embodiment 2

[0059] refer to figure 2 , the embodiment of a certain improved A2 / O and plasma technology sewage deep purification process sewage treatment plant, the influent water quality index of described sewage is as table 4.

[0060] Table 4. Influent water quality of a sewage treatment plant

[0061] serial number

project

Measured value (mg / L)

1

COD

690

2

BOD

370

3

SS

300

4

animal and vegetable oil

-

5

Petro

-

6

anionic surfactant

-

7

Total Nitrogen (as N)

75

8

Ammonia nitrogen (as N)

57

9

Total phosphorus (calculated as P)

8

10

Chroma (dilution factor)

11

pH

6-8

[0062] Due to the high depth of influent pollutants, the figure 2 Advanced biochemical and plasma technology for advanced sewage treatment and recycling process, the steps are as follows:

[0063] 1. Primary treatment

[0064] After t...

Embodiment 3

[0084] refer to image 3 , an embodiment of a sewage treatment plant using oxidation ditch and plasma technology, including coarse grids, fine grids, aerated grit chambers, primary sedimentation tanks, oxidation ditch, secondary sedimentation tanks, lift pumps, plasma treatment, Denitrification tank, coagulation sedimentation tank, V-shaped filter tank and other facilities, after treatment, the discharged water will meet the relevant water quality standards of the "Environmental Quality Standards for Surface Water" (GB3838-2002).

[0085] The sewage inflow indicators are shown in Table 6.

[0086] Table 6. Influent water quality indicators of a sewage treatment plant

[0087] serial number

Basic Control Items

Measured value (mg / L)

1

COD

341

2

BOD

192

3

SS

230

4

animal and vegetable oil

-

5

Petro

-

6

anionic surfactant

-

7

Total Nitrogen (as N)

68

8...

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Abstract

The invention discloses a sewage deep purification method which is characterized by comprising the following steps: (1) primary treatment; (2) secondary treatment; (3) deep treatment; (4) sludge treatment; and (5) gas treatment. The primary treatment mainly comprises coarse screen and fine screen filtration and an aeration grit chamber, and aims to remove large-particle solids in sewage. The secondary treatment mainly comprises biochemical treatment and aims to remove main pollutants such as COD (Chemical Oxygen Demand), BOD (Biochemical Oxygen Demand), ammonia nitrogen, total nitrogen, chromaticity and total phosphorus in the sewage through biochemistry and separate the main pollutants through precipitation of a secondary sedimentation tank; the deep treatment mainly comprises the steps of removing ammonia nitrogen and total nitrogen through plasma treatment, and filtering out total phosphorus, COD and SS through coagulating sedimentation, so that a water body is deeply purified.

Description

technical field [0001] The invention relates to a sewage deep purification method. Background technique [0002] Currently, the commonly used sewage treatment technologies in municipal sewage treatment plants are nothing more than two processes: activated sludge process and biofilm process. The activated sludge process mainly includes A2 / O and its improved process (such as UCT process), various oxidation ditch processes, SBR and its variant processes (CAST process, etc.), etc. At present, the activated sludge process has an absolute advantage, and only a few The sewage treatment plant adopts biofilm process. Most of the effluent from these processes can only meet the effluent indicators of the first-level B standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) without advanced treatment. The indicators are shown in Table 1: [0003] Table 1 The maximum allowable emission concentration of basic control items (daily average value) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/121B01D53/18C02F101/16C02F101/30
CPCY02E50/30
Inventor 吴以伯闫承凯
Owner DAYUAN ENVIRONMENTAL TECH XIAMEN CO LTD
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