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Sludge reduction method adopting lime hot-alkaline cell breaking

A sludge reduction and lime technology, applied in sludge treatment, biological sludge treatment, chemical instruments and methods, etc., can solve the problems of high energy consumption, increased phosphorus concentration, and increased phosphorus concentration in effluent, achieving low energy consumption and reduced Cost, the effect of strengthening phosphorus removal effect

Inactive Publication Date: 2016-09-21
深圳市瑞清环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The currently studied cell destruction methods (such as high-pressure average cell destruction, ozone-ultrasonic cell destruction, ClO 2 - Ultrasonic cell destruction) are all aimed at high cracking rate, and have the disadvantage of high energy consumption
In addition, due to the phosphorus contained in the activated sludge, these methods also have a prominent disadvantage: resulting in an increase in the concentration of phosphorus in the effluent
The thermal-alkali combined cell destruction method using sodium hydroxide as an alkali regulator has many research applications, but it is mainly used for composting, sludge anaerobic digestion pretreatment, etc., and less used for recessive growth sludge reduction
Moreover, the use of sodium hydroxide to break the cells also has the problem of increasing the phosphorus concentration after the treatment of the broken cells.

Method used

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Effect test

Embodiment 1

[0030] A lime hot-alkali cell-breaking sludge reduction method comprises the following steps: (1) sludge concentration; (2) lime hot-alkali treatment; (3) recessive growth.

[0031] Wherein, the sludge concentration method in the step (1) refers to performing sludge concentration on the remaining sludge before cell destruction, and the water content after concentration is 90%.

[0032] The sludge cell breaking method in the step (2) is to use quicklime as an alkali regulator, add quicklime to the activated sludge and mix evenly, and the dosage of quicklime is based on controlling the pH of the mixture to be 11.6. Heat the mixture of activated sludge and quicklime, control the temperature of the mixture to 76.5°C, and keep at this temperature for 182min.

[0033] The step (3) is by returning the sludge treated in the steps (1) and (2) to the biochemical reactor. The reactor adopts SBR, and the pH of SBR is controlled at 7.5 after the sludge is returned, and the hidden growth i...

Embodiment 2

[0039] A lime hot-alkali cell-breaking sludge reduction method, which is operated by an SBR device, comprises the following steps: (1) sludge concentration; (2) lime hot-alkali treatment; (3) recessive growth.

[0040] Wherein, the sludge concentration method in the step (1) refers to performing sludge concentration on the remaining sludge before cell destruction, and the water content after concentration is 85%.

[0041] The sludge cell breaking method in the step (2) is to use slaked lime as an alkali regulator, add quicklime to the activated sludge and mix evenly, and the dosage of slaked lime is based on controlling the pH of the mixture to be 13. Heat the mixture of activated sludge and slaked lime, control the temperature of the mixture to 90.0°C, and keep at this temperature for 250min.

[0042] The step (3) is by returning the sludge treated in the steps (1) and (2) to the biochemical reactor. The reactor uses SBR, and the pH of the SBR is controlled at 8.5 after the ...

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Abstract

The invention belongs to the field of water treatment and particularly relates to a sludge reduction method adopting lime hot-alkaline cell breaking. The method comprises the following treatment steps: (1) sludge concentration; (2) lime hot-alkaline treatment; (3) cryptic growth. During hot-alkaline cell breaking treatment in the step (2), lime is taken as an alkaline conditioning agent, and then heating is performed; in the step (3), sludge subjected to cell breaking is put back to a biochemical pond, and cryptic growth of the sludge is realized. According to the sludge reduction method, the low-cost lime is taken as the alkaline conditioning agent and combined with a cryptic growth method for sludge reduction, the reduction cost is low, besides, phosphorus removal can be enhanced, and a new approach is provided for sludge reduction.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for reducing the amount of lime hot alkali cell-breaking sludge. Background technique [0002] Domestic sewage treatment plants mainly use the activated sludge method, and the disadvantages of the large sludge output of the activated sludge method cannot be ignored more and more. [0003] At present, based on the four levels of reduction, harmlessness, stabilization, and recycling of sludge treatment and disposal research objectives, sludge treatment and sludge disposal are usually distinguished at home and abroad. The sludge treatment method refers to the treatment of a series of unit process combinations to meet the disposal requirements before the sludge is disposed of, usually including sludge dehydration, anaerobic digestion, sterilization and drying, etc.; the sludge disposal method refers to the disposal of the treated sludge The final disposal methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/12C02F11/00
CPCC02F11/02C02F11/00C02F11/12C02F2303/06
Inventor 李继吕小梅翟坤
Owner 深圳市瑞清环保科技有限公司