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Recycling method of excess sludge

A technology of excess sludge and treatment method, applied in the field of resource treatment of excess sludge, can solve the problems of economic waste, increase, and reduction of carbon source organic matter, etc., and achieve the effect of small transformation

Inactive Publication Date: 2019-03-19
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the large amount of free cell debris and suspended matter in the supernatant, and the concentration of nitrogen and phosphorus is too high, the sludge liquid with deep physicochemical lysis is not suitable for direct reflux as a carbon source
Many research results have shown that mild physical and chemical pretreatment combined with chemical conditioning agents can improve the dehydration of sludge, while deep physical and chemical lysis technology will lead to an increase in free cell fragments and a significant increase in protein dissolution rate, resulting in the dehydration of conventional chemical conditioning agents. Dosing can not improve the severely deteriorated dehydration
If we only increase the dosage of the original chemical conditioning agent, it will not only cause economic waste, but also excessively reduce the carbon source organic matter released by lysis, and reduce the resource utilization of physicochemical lysis sludge Level

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] refer to figure 1 The treatment process, the concentration of 8.5g / L of excess sludge first ozone concentration of 55.1mg O 3 / gSS response. It can be seen from Table 1 that the sludge concentration after 6 hours of ozone reaction is 2.79g / L, and the reduction rate reaches 67.2%. The SS of the sludge supernatant after deep ozone oxidation is as high as 1.38g / L, accounting for 49.5% of the SS of the sludge mixture, indicating that nearly half of the total solids of the sludge after ozone oxidation are suspended, and the sedimentation performance is poor. And cannot be removed by gravity settling. The sludge after deep ozone oxidation is treated with aluminum sulfate pre-concentration and polyacrylamide dehydration. figure 2 It can be seen that under the condition that the dosage of aluminum sulfate is 250kg / t DS, the turbidity of the sludge supernatant is reduced from 1395NTU to 9.7NTU, the COD is reduced from 2368mg / L to 630.4mg / L, and the total phosphorus is reduce...

Embodiment 2

[0053] refer to figure 1 According to the treatment process, the residual sludge with a concentration of 12.1g / L was first subjected to deep ultrasonic crushing treatment, and the characteristics of the crushed sludge were shown in Table 2. It can be seen from Table 2 that the sludge concentration after ultrasonication is 5.06g / L, and the reduction rate reaches 58.2%. For deep ultrasonic crushing sludge, PAFC, PAC, Al 2 (SO 4 ) 3 , FeCl 3 Dosing amount with PFSS (dosing amount is 90.3, 148.7, 82.7 and 122.3kg / t DS respectively), the results are as attached image 3 shown. attached by image 3 It can be seen that COD, turbidity and total phosphorus of all sludge supernatants pre-concentrated by inorganic coagulants were significantly reduced. Among them, the effect of aluminum sulfate pre-concentration is better, the total phosphorus is reduced to 13.2mg / L, the turbidity is 152NTU, and the COD is 1007.3mg / L. After further dehydration and conditioning, it can meet the req...

Embodiment 3

[0058] Compared with Example 1, most of them are the same, except in this example: the concentration of excess sludge is 5g / L.

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Abstract

The invention relates to a recycling method of excess sludge. The recycling method comprises the following steps: (1) a deep physical-chemical cytolysis stage: carrying out deep physical-chemical cytolysis treatment on the excess sludge of a sewage treatment plant so that the reduction rate of the excess sludge is greater than 30%; (2) a pre-concentration conditioning stage: continuously adding aninorganic coagulant to carry out pre-concentration conditioning treatment; (3) a dewatering conditioning stage: adding a macromolecular organic flocculant and carrying out dewatering conditioning treatment; (4) a sludge-water separation stage: standing and precipitating to obtain sludge precipitate, further dewatering the sludge sludge precipitate, mixing supernatant liquid with dewatered supernatant liquid, and adding the mixture as a carbon source into a biological treatment unit for recycling. Compared with the prior art, aiming at the feature of the deep physical-chemical cytolysis sludge, an appropriate chemical conditioning agent composition is used for chemically conditioning the sludge to enable the sludge to reach the requirements on recycling of the supernatant liquid and dewatering of the sludge; a method for effectively treating the excess sludge is provided.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment in the urban sewage treatment industry, and relates to a method for resourceful treatment of surplus sludge. Background technique [0002] At present, urban sewage treatment brings a large amount of sludge. If the sludge is not treated properly, it will easily become a secondary pollution source of the environment. In this situation, sludge treatment and disposal are urgently moving towards stabilization. , Harmless and resourceful. [0003] Sludge dehydration is an important step to achieve sludge reduction. However, due to the strong hydrophilicity of sludge solid particles, the adsorbed water and bound water on the surface of sludge cells cannot be removed by mechanical methods. Therefore, sludge dehydration requires Perform sludge conditioning. At present, the commonly used conditioning methods for sludge can be divided into physical, chemical, thermal and combined conditioning meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/147C02F11/123C02F11/127C02F11/00
CPCC02F11/00C02F11/123C02F11/127C02F11/14
Inventor 周振吴炜陈柳宇杨家哲安莹叶小芳明强江婕
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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