Method for treating surplus sludge produced after biological treatment of wastewater

A treatment method and biological treatment technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of high cost hindering engineering application, increasing the solid content of mud cake after dehydration, etc. , to achieve the effect of reducing secondary pollution, increasing permeability and increasing particle size

Inactive Publication Date: 2014-12-10
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li Juan et al. (Environmental Science, Vol. 30, No. 2, 2009, 475-479) found that the extracellular polymers of activated sludge could be effectively decomposed by Fenton reagent, and the average particle size of sludge particles was significantly reduced after oxidation treatment. , the uniformity is improved, the inorganic degr

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  • Method for treating surplus sludge produced after biological treatment of wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1), the remaining sludge of urban sewage is prepared into a mixed solution with a suspended solids concentration of 9486mg / L, 500ml is taken and added to the reaction tank, under rapid stirring at 100 rpm, the pH is adjusted to 2.0 with hydrochloric acid;

[0024] (2), the mixed solution after step (1) is heated to 50 DEG C, add ferrous sulfate solution, sodium persulfate solution or potassium persulfate solution and industrial fly ash, stir and react with 40 rpm for 4 hours; Described ferrous sulfate solution, mass-volume concentration is 10%; Sodium persulfate solution or potassium persulfate solution mass-volume concentration is 10%; The processing method of industrial fly ash is: dry at 105 ℃, pass 200 Mesh sieve, remove block and slag, dry for subsequent use; Wherein, ferrous sulfate 0.43g in ferrous sulfate solution, sodium persulfate 2.31g in sodium persulfate solution, industrial fly ash 1.58g.

[0025] (3) Adjust the pH to 9.0 with sodium hydroxide solution, d...

Embodiment 2

[0033] (1), the remaining sludge of urban sewage is prepared into a mixed solution with a suspended solid concentration of 10108mg / L, 500ml is taken and added to the reaction tank, and under rapid stirring at 110 rpm, the pH is adjusted to 2.0 with hydrochloric acid;

[0034] (2), the mixed solution treated in step (1) is heated to 60° C., adding ferrous sulfate solution, sodium persulfate solution or potassium persulfate solution and industrial fly ash, and stirring and reacting for 5 hours at 50 rpm; Described ferrous sulfate solution, mass-volume concentration is 8%; Sodium persulfate solution or potassium persulfate solution mass-volume concentration is 11%; The processing method of industrial fly ash is: dry at 90 ℃, pass 200 Mesh sieve, remove lumps and slag, dry for subsequent use; wherein, 0.465g of ferrous sulfate in ferrous sulfate solution, 2.4g of sodium persulfate in sodium persulfate solution, and 1.6g of industrial fly ash.

[0035] (3) Calcium hydroxide solutio...

Embodiment 3

[0038] (1) Prepare the mixed liquor with a suspended solids concentration of 10525mg / L from the remaining sludge of urban sewage, take 500ml and add it to the reaction tank, stir rapidly at 100r / min, and adjust the pH to 3.0 with hydrochloric acid;

[0039] (2), the mixed solution treated in step (1) is heated to 58° C., ferrous sulfate solution, sodium persulfate solution or potassium persulfate solution and industrial fly ash are added, and the reaction is stirred and reacted at 50 rpm for 6 hours; Described ferrous sulfate solution, mass-volume concentration is 10%; Sodium persulfate solution or potassium persulfate solution mass-volume concentration is 12%; The processing method of industrial fly ash is: dry at 90 ℃, pass 200 Mesh sieve, remove block and slag, dry for subsequent use; Wherein, ferrous sulfate 0.41 in ferrous sulfate solution, potassium persulfate 2.3g in potassium persulfate solution, industrial fly ash 1.7g.

[0040] (3) Use sodium hydroxide solution to ad...

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Abstract

The invention provides a method for treating surplus sludge produced after biological treatment of wastewater. By adding a ferrous sulfate solution, a sodium persulfate solution or a potassium persulfate solution, and industrial coal ash, the sludge is treated to obtain a filter cake and a filter liquor. Compared with the prior art, adding divalent ferric salt and heating synergize to stimulate the persulfate to produce a free sulfate radical having a strong oxidizing property, the free sulfate radical is used to efficiently break a microbial cell in the sludge, then the microorganism is inactivated, the adhesive action with an extracellular polymeric substance is remarkably weakened, the extracellular polymeric substance is then stripped, the bond-state water is released, and the structure and the surface hydrophobicity of the sludge flocculant are changed; after the industrial coal ash is added, the permeability of the filter cake is improved, and the filter cake can play the role of a filter aid. According to the method, the specific resistance of the sludge is as low as (0.2-0.5)*108S<2>/g, the moisture content of the dehydrated filter cake is as low as 40-60%, the secondary pollution caused by common flocculants like polyacrylamide is reduced, the operating cost for the dehydration of the sludge is lowered, original processing equipment can be used to implement the method without any transformation, the operation is convenient, and the dehydrated sludge is directly backfilled or is used to produce a ceramsite or building material.

Description

technical field [0001] The invention relates to a treatment method for excess sludge, in particular to a treatment method for excess sludge after biological treatment of wastewater. Background technique [0002] In recent years, the rapid development of my country's sewage treatment work has largely alleviated the crisis of water pollution in my country. However, the activated sludge process and derivative processes are the most widely used biological treatment technologies for wastewater treatment. The biggest drawback is the generation of a large amount of surplus sludge. As wastewater treatment standards become more and more stringent, the output of excess sludge has also increased significantly, and the accompanying sludge pollution has become increasingly prominent, which has aroused great concern from all walks of life. At present, after anaerobic / aerobic digestion of excess sludge, organic polymers such as polyferric sulfate, polyaluminum chloride, and polyacrylamide ...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 唐海沙俊鹏
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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