A method for depth reduction of excess activated sludge

A technology for residual active sludge, which is applied in sludge treatment, sludge treatment, oxidation treatment of sludge, etc., can solve the problems of low cracking efficiency, low reduction rate, and large dosage of chemicals for residual activated sludge, and achieve reduction Amount of remaining activated sludge and treatment cost, low treatment cost, effect of reducing water content and organic components

Active Publication Date: 2020-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problems of low cracking efficiency, large dosage of chemicals and low reduction rate of excess activated sludge in the prior art, the present invention provides a method for deep reduction of excess activated sludge by using a combined process of sludge cracking and sludge digestion

Method used

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  • A method for depth reduction of excess activated sludge

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Embodiment approach

[0044] Such as figure 1 Shown, the embodiment of a kind of excess activated sludge depth reduction method of the present invention is as follows:

[0045] Step 1: The remaining activated sludge 1 is divided into two streams, which are subjected to hot alkali process treatment and Fenton process treatment respectively.

[0046] Fenton process treatment: pump acid 2, iron salt solution 3 and oxidant 4 into excess activated sludge 1 respectively, and enter into oxidation reactor 5. The adjusted pH value of the acid 2 ranges from 3 to 5, and the preferred range is 4 to 5; the acid 2 used to adjust the pH value can be H 2 SO 4 , HCl or HNO 3 One or more of them; iron salt solution 3 can be FeCl 2 , FeSO 4 , Fe(NO 3 ) 2 , FeCl 3 , Fe 2 (SO 4 ) 3 and Fe(NO 3 ) 3 One or several in the solution, preferably FeSO 4 solution. The configuration concentration of the iron salt solution 3 is 2% in terms of Fe mass percentage, and the amount of iron salt (in terms of Fe content)...

Embodiment 1

[0052] Characteristics of residual activated sludge: 10t of sludge in the sludge thickening tank of a sewage treatment plant biochemical treatment process, the sludge index is: the concentration of mixed suspended solids (MLSS) is 30.5g / L (water content 96.95%), the mixed liquid is volatile The suspended solids concentration (MLVSS) was 24.6g / L.

[0053] The implementation steps of the above-mentioned residual activated sludge treatment are as follows:

[0054] Step 1: The remaining activated sludge 1 is subjected to hot alkali process treatment and Fenton process treatment respectively. The ratio of hot alkali process and Fenton process to treat excess activated sludge is determined by process parameters, and the ratio is 1:0.3.

[0055] Fenton process treatment: After pumping acid 2, iron salt solution 3 and oxidant 4 into the remaining activated sludge 1, they are sent to the oxidation reactor 5; the pH value is adjusted to 4, and the acid used to adjust the pH value is H ...

Embodiment 2

[0062] Characteristics of residual activated sludge: 10t of sludge in the sludge thickening tank of a sewage treatment plant biochemical treatment process, the sludge index is: the concentration of mixed suspended solids (MLSS) is 30.5g / L (water content 96.95%), the mixed liquid is volatile The suspended solids concentration (MLVSS) was 24.6g / L.

[0063] The implementation steps of the above-mentioned residual activated sludge treatment are as follows:

[0064] Step 1: The remaining activated sludge 1 is subjected to hot alkali process treatment and Fenton process treatment respectively. The ratio of hot alkali process and Fenton process to treat excess activated sludge is determined by process parameters, and the ratio is 1:0.5.

[0065] Fenton process: After pumping acid 2, iron salt solution 3 and oxidant 4 into the remaining activated sludge 1, they are sent to the oxidation reactor 5; the pH value is adjusted to 5, and the acid used to adjust the pH value is H 2 SO 4 a...

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Abstract

The invention relates to the technical field of solid waste treatment and particularly relates to a deep reduction method for remaining activated sludge with a sludge disintegration and sludge digestion combined process. The deep reduction method for remaining activated sludge with the sludge disintegration and sludge digestion combined process aims to solve the problems of low disintegration efficiency of the remaining activated sludge, large chemical use amount, low reduction rate and the like in the prior art. According to the sludge disintegration technology, the sludge is deeply disintegrated with a hot alkali and Fenton combined technology, the disintegration rate, the digestion rate and the overall reduction rate of the remaining activated sludge are increased, and the consumption amount of acid and alkali and the processing cost are reduced.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for realizing deep reduction of excess activated sludge by utilizing a combined process of sludge cracking and sludge digestion. Background technique [0002] With the increase of sewage treatment in our country, the amount of remaining activated sludge has exceeded 30 million t / a (moisture content 80%). At present, the commonly used residual activated sludge treatment methods at home and abroad mainly include land utilization, landfill, heat treatment, incineration and resource utilization. Compared with developed countries, the treatment of excess activated sludge in my country is relatively backward. Because the relevant standard system is not perfect, most of the excess activated sludge has not been treated in a standardized manner. Excess activated sludge contains toxic and harmful substances such as pathogens, heavy metals and persistent organic comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/06C02F11/04C02F11/147
CPCC02F11/00C02F11/04C02F11/06C02F11/12C02F2303/06Y02E50/30Y02W10/20
Inventor 魏令勇李昕阳邱松杨芳芳侯秀华
Owner CHINA PETROLEUM & CHEM CORP
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