Pretreatment technical method for strengthening three-phase separation of sludge

A three-phase separation and pretreatment technology, applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the complex composition of sludge, strong water-solid stability, and difficult separation technology. major problems, to achieve the effect of enhancing separability, improving technical level, and mild reaction conditions

Pending Publication Date: 2020-10-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the composition of sludge is complex, presenting a stable colloidal floc state, strong water-solid stability, and difficult separation technology

Method used

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  • Pretreatment technical method for strengthening three-phase separation of sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1-Intensified three-phase separation of sludge from a sewage treatment plant in Changsha

[0022] The technical method for enhancing the three-phase separation of sludge in this embodiment includes the following steps:

[0023] (1) Prepare 1mol / L sodium hydroxide solution and 1mol / L sulfuric acid solution;

[0024] (2) Under fast stirring conditions (speed gradient G value 1000s -1 ), the stirring time is 2 minutes, the sodium hydroxide solution and sulfuric acid solution prepared in step (1) are added to the sludge, the pH value of the sludge is monitored in real time through the pH electrode, and the sodium hydroxide solution or the sodium hydroxide solution or The dosage of sulfuric acid solution will finally adjust the pH value of the sludge to 12;

[0025] (3) Under constant stirring conditions (speed gradient G value is 70s -1 ), using a pH electrode to monitor the pH value of the sludge in real time, by constantly adding sodium hydroxide solution or sulfuric acid...

Embodiment 2

[0028] Example 2-Intensified three-phase separation of sludge from a sewage treatment plant in Changsha City

[0029] The technical method for enhancing the three-phase separation of sludge in this embodiment includes the following steps:

[0030] (1) Prepare 3mol / L potassium hydroxide solution and 1mol / L hydrochloric acid solution;

[0031] (2) Under fast stirring conditions (speed gradient G value 700s -1 ), the stirring time is 5 minutes, the sodium hydroxide solution and sulfuric acid solution in step (1) are added to the sludge, the pH value of the sludge is monitored in real time through the pH electrode, and the potassium hydroxide solution or the hydrochloric acid solution is feedback controlled according to the sludge pH value. Dosing amount, finally adjust the sludge pH value to 10;

[0032] (3) Under constant stirring conditions (speed gradient G value is 70s -1 ), use a pH electrode to monitor the pH value of the sludge in real time, and keep the pH value of the sludge con...

Embodiment 3

[0035] Example 3-Intensified three-phase separation of sludge from a sewage treatment plant in Changsha

[0036] The technical method for enhancing the three-phase separation of sludge in this embodiment includes the following steps:

[0037] (1) Prepare 2mol / L sodium hydroxide solution and 3mol / L sulfuric acid solution;

[0038] (2) Under fast stirring conditions (speed gradient G value 850s -1 ), the stirring time is 5 minutes, the sodium hydroxide solution and sulfuric acid solution in step (1) are added to the sludge, the pH value of the sludge is monitored in real time through the pH electrode, and the sodium hydroxide solution or the sulfuric acid solution is feedback controlled according to the sludge pH value. Dosing amount, finally adjust the pH value of the sludge to 11;

[0039] (3) Under constant stirring conditions (speed gradient G value is 45s -1 ), use a pH electrode to monitor the pH value of the sludge in real time, and keep the pH value of the sludge constant at 11 ...

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Abstract

The invention discloses a pretreatment technical method for strengthening three-phase separation of sludge. By adjusting the pH value of the sludge to an alkaline range; the electronegative repulsiveforce among sludge particles is increased, and the swelling rupture of sludge cells is enhanced; meanwhile, sludge organic matter is promoted to migrate to a water phase, inorganic matter is promotedto gather and cake, then the mutual constraint effect between the sludge organic matter and the inorganic matter is destroyed, the stable floc structure of the sludge is dispersed and cracked, and thedensity difference and separability of the organic phase and the inorganic phase are improved. The method has the advantages of accessible raw materials, mild reaction conditions and simple operationcontrol. The separability of organic matters and inorganic matters is enhanced, the three-phase separation performance of inorganic matters, organic matters and water of the sludge is enhanced and improved, and the method has important social and environmental benefits and wide market application prospects for improving the technical level of safe treatment and efficient resource utilization of the sludge.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a pretreatment technical method for strengthening the three-phase separation of sludge. Background technique [0002] Sludge is an inevitable by-product of sewage biological treatment. It contains a large number of pathogenic bacteria, heavy metals and toxic organics. If not properly disposed of, it will cause serious environmental pollution risks. With the rapid development of my country's economic construction and urbanization, the amount of sewage generated is increasing, and the corresponding sewage collection and treatment rate is gradually increasing, and then a large amount of sludge is produced. According to the National Urban-Rural Construction Statistical Yearbook issued by the Ministry of Housing and Urban-Rural Development in 2020 and other relevant statistics, my country’s current sewage design capacity is 202 million tons per day, and a total of 58.825 mil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/143C02F11/127C02F101/10C02F101/30
CPCC02F11/00C02F11/127C02F2101/10C02F2101/30C02F11/143
Inventor 戴晓虎武博然柴晓利杨殿海杨东海许颖
Owner TONGJI UNIV
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