Coagulation precipitation equipment based on sludge concentration pool supernatant fluid backflow and method thereof

A sludge thickening tank, coagulation and sedimentation technology, applied in the direction of flocculation/sedimentation water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. The volume of the reaction tank and the sedimentation tank, the increase of the investment cost of water treatment, etc., can shorten the residence time, increase the cost of equipment construction, and reduce the cost of equipment.

Inactive Publication Date: 2019-01-15
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is to reflux the supernatant of the sedimentation tank in a large proportion. In order to ensure the peak-shaving and valley-filling effect on the influent water quality, the amount of reflux water is large, and the hydraulic load of the reaction tank and the sedimentation tank is increased. The reaction tank and the sedimentation tank need to be increased. volume, thus increasing the investment cost of water treatment

Method used

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  • Coagulation precipitation equipment based on sludge concentration pool supernatant fluid backflow and method thereof
  • Coagulation precipitation equipment based on sludge concentration pool supernatant fluid backflow and method thereof
  • Coagulation precipitation equipment based on sludge concentration pool supernatant fluid backflow and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Treat the same industrial phosphorus-containing sewage as in Comparative Example 1, and the sewage treatment capacity is 300m 3 / d, the total phosphorus concentration is 10.2-50.5mg / L, and the water quality at the outlet of the sedimentation tank is controlled to meet the requirements of the national comprehensive sewage discharge standard GB 8978-1996.

[0055] Such as figure 2 As shown, adopting a kind of coagulation sedimentation method based on the return flow of the supernatant of the sludge thickening tank of the present embodiment comprises the following steps:

[0056] (1) Make the sewage to be treated enter the fast section of the reaction tank, add a precipitant (mass percentage is 10% Ca(OH) 2 , the amount added is 0.45% of the sewage treatment capacity, that is, 1.35m 3 / d) rapid stirring (60rpm) for rapid precipitation (5min precipitation time) reaction;

[0057] (2) Step (1) After the precipitation reaction, the effluent flows into the slow section of ...

Embodiment 2

[0069] Treatment of copper-containing sewage, the sewage treatment capacity is 300m 3 / d, the total copper concentration is 100mg / L, and the effluent water quality at the outlet of the sedimentation tank is controlled to meet the secondary effluent requirements in the national comprehensive sewage discharge standard GB 8978-1996 with a total copper concentration of less than 1mg / L.

[0070] Such as figure 2 As shown, adopting a kind of coagulation sedimentation method based on the return flow of the supernatant of the sludge thickening tank of the present embodiment comprises the following steps:

[0071] (1) Make the sewage to be treated enter the fast section of the reaction tank, add a precipitant (1% polyaluminium chloride (PAC) by mass percentage), and the addition amount is 1% of the sewage treatment capacity (ie 3m 3 / d) rapid stirring (40rpm) for rapid precipitation (precipitation time 10min) reaction;

[0072] (2) Step (1) After the precipitation reaction, the effl...

Embodiment 3

[0080] Treatment of high COD organic wastewater, the sewage treatment capacity is 300m 3 / d, the COD concentration is 4000mg / L, and the COD of the effluent at the outlet of the sedimentation tank is controlled to meet the secondary effluent requirements in the national comprehensive sewage discharge standard GB 8978-1996, that is, less than 200mg / L.

[0081] Such as figure 2 As shown, adopting a kind of coagulation sedimentation method based on the return flow of the supernatant of the sludge thickening tank of the present embodiment comprises the following steps:

[0082] (1) Make the sewage to be treated enter the fast section of the reaction tank, add a precipitant (the mass percentage is 20% ferric chloride, and the addition is 0.08% of the sewage treatment capacity, i.e. 0.24m 3 / d) rapid stirring (30rpm) for rapid precipitation (precipitation time 8min) reaction;

[0083] (2) Step (1) After the precipitation reaction, the effluent flows into the slow section of the re...

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Abstract

The invention discloses coagulation precipitation equipment based on sludge concentration pool supernatant fluid backflow and a method thereof, and belongs to the technical field of sewage treatment.By using the technical scheme, sewage to be treated enters a reaction pool high-speed section; precipitating agents are added and rapidly stirred to perform precipitation reaction; next, the materialsenter a reaction pool low-speed section; coagulant aids are added for low-speed stirring to enable alumen ustum to grow up, so that the formed mud water mixture enters a precipitation pool; supernatant fluid in the precipitation pool is discharged; sludge of the precipitation pool enters a sludge concentration pool; partial supernatant fluid in the sludge concentration pool flows back to the reaction pool high-speed section to be mixed with the sewage to be treated for continuous and fast precipitation reaction. Through the sludge concentration pool supernatant fluid backflow, the effect of fast precipitating contaminants in the sewage by using suspension small particles in the sludge precipitation pool supernatant fluid is realized; no crystal nucleus is additionally added; the additionof the precipitating agents is reduced; the reaction dwell time of the reaction pool is shortened; the reaction pool volume is reduced; the sewage treatment investment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a coagulation and sedimentation equipment and method based on the backflow of supernatant in a sludge concentration tank. Background technique [0002] In recent years, the problem of water pollution in my country has become increasingly serious. With the rapid development of economy and society, water pollution in some river basins is showing a trend of increasing. Various complex pollutants lead to the decline of water environment quality, the damage of water ecosystem, and the increase of environmental hidden dangers. On the one hand, water resources are scarce in the central, western and northern areas, which require advanced treatment of urban sewage and industrial wastewater to increase the recycling rate. On the other hand, the problem of drinking water safety has become increasingly prominent. There are more and more trace organic pollutants with bio...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/56C02F101/10
CPCC02F1/5236C02F1/56C02F2101/105
Inventor 张炜铭单超赵昕张延扬汪林张孝林花铭潘丙才吕路
Owner NANJING UNIV
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