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Coagulation-oxidation combined type method for processing sewage

A sewage treatment method and combined technology, which are applied in the directions of oxidized water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the complicated operation process, limited flocculation effect, investment and operation cost Increase and other problems, to achieve the effect of good effluent quality, small footprint, and reduced operating costs

Active Publication Date: 2011-10-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this combined process are: (1) coagulation sedimentation and Fenton oxidation need to be carried out in two series reaction tanks, resulting in increased investment and operating costs and complicating the operation process; (2) Fenton oxidation process under acidic conditions with Fe(OH) 3 Sedimented Fe 3+ The amount is small, the flocculation effect is limited, so it is necessary to add a coagulant

Method used

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Examples

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Effect test

Embodiment 1

[0031] The coagulation-Fenton combined treatment is carried out on the secondary treatment effluent of an oil refinery sewage treatment plant by using the technology of the present invention. The COD concentration of the raw water is 92.7mg / L, the ammonia nitrogen concentration is 5.3mg / L, and the petroleum is 3.6mg / L. Set each operation cycle as 360min, which is divided into the following nine processes:

[0032] (1) Water intake: open the reaction tank feed valve 9-5, the adjustment tank discharge valve 2-5, the water inlet pump 3 and the variable speed mixer 13, and the water to be treated in the adjustment tank 1 enters the reaction tank 10, which is the same as the last operation The solid precipitation remaining in the period (or the coagulant manually added during the first operation) is uniformly mixed, and the water level is set by the process controller 23 to be 2 / 3 of the height of the reaction tank 10, the pH value is 4.0, and the feeding pump 8- 1. Feed valve 9-1,...

Embodiment 2

[0043] After biochemical treatment of wastewater discharged from a chemical plant, the concentration of COD is 306.9mg / L, BOD 5 It is 18.6mg / L, B / C=0.06, which belongs to typical refractory sewage. Adopt the technology of the present invention to carry out coagulation-Fenton combined treatment to it, set each operating cycle as 360min, be divided into the following eight operations (no secondary mud discharge, that is, the dosage of coagulant is Fenton oxidation 100% of the solid precipitated from the process):

[0044] (1) Water intake: open the reaction tank feed valve 9-5, the adjustment tank discharge valve 2-5, the water inlet pump 3 and the variable speed mixer 13, and the water to be treated in the adjustment tank 1 enters the reaction tank 10, which is the same as the last operation The solid precipitation remaining in the period (or the coagulant manually added during the first operation) is evenly mixed, and the water level is set by the process controller 23 to be ...

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Abstract

The invention relates to a coagulation-oxidation combined type method for processing sewage. According to the method, a reaction tank with an automatic control system is adopted, and a coagulation process and a Fenton oxidation process are successively carried out in the reaction tank. The method provided by the invention comprises the following steps of: carrying out the Fenton oxidation process, adjusting the pH value to a neutral pH, allowing sewage to stay, followed by separation, taking the obtained solid precipitate as a coagulant, treating the sewage in the reaction tank by the coagulation process, followed by staying and separation, allowing settled sludge to flow out through a mud collecting bucket on the lower portion of the reaction tank and enter a subsequent sludge processing system; and adding a Fenton reagent into the reaction tank to carry out the oxidation treatment, adjusting the pH value to a neutral pH, followed by staying and separation again, discharging a supernatant as the effluent, reusing the produced neutral solid precipitate as the coagulant of the next coagulation process. The method provided by the invention is suitable for the advanced treatment of sewage as well as the treatment of refractory organic sewage to reach the standard, and has advantages of simple equipment, small installation space, and convenient operation and management; in addition, the coagulation-settlement process and the Fenton oxidation reaction are finished in a reaction tank, and the whole treatment process is automatically controlled.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and is especially suitable for the advanced treatment of sewage and the up-to-standard treatment of refractory organic sewage, and relates to a coagulation-Fenton oxidation combined sewage treatment method. Background technique [0002] Under the current background of citizens' increasing awareness of environmental protection, increasingly stringent national environmental protection laws and regulations, and continuous advancement of energy conservation and emission reduction, advanced sewage treatment and the standard treatment of refractory organic sewage have gradually become research hotspots in the field of water treatment in my country and the world. Theory and practical experience show that traditional biological treatment methods have limited effects on refractory organic matter in secondary treatment effluent and refractory organic wastewater, while physical and chemical treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72
Inventor 邓旭亮杜龙弟荣丽丽张春燕王桂芝吴林美刘长福王薇荣国海
Owner PETROCHINA CO LTD
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