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Sludge deep dehydration method

A deep dewatering and sludge technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of high moisture content of mud cake wrapping, high operating cost of sludge treatment, and increased post-treatment cost, etc. effect of chemical treatment, reducing sludge treatment cost and improving sludge treatment efficiency

Active Publication Date: 2013-09-25
UNIVERSTAR SCI & TECH SHENZHEN +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Only using cationic polymers for sludge dehydration will result in high moisture content in the mud cake; using high-energy microelectronic radiation, microwave heating, ultrasonic, electrolysis, biological enzymes and other technologies for sludge dehydration, the entire reaction process has a great impact on the operation process. Strict control requirements make the operation cost of sludge treatment high; if industrial raw materials or waste residues are used alone, the bound water in the sludge cannot be removed due to their inherent properties, which will increase the volume of sludge before and after treatment. If the volume increases If it is too large, the post-treatment cost will be significantly increased, which is not conducive to the later sludge disposal

Method used

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Examples

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Embodiment 1

[0050] A method for deep dewatering of sludge, the process steps are as follows:

[0051] S11: Starting from the remaining sludge with an organic matter content of 55.2wt% and a moisture content of 97wt%, add peracetic acid free radical generators of 5wt% on a dry basis to the sludge, and stir thoroughly;

[0052] S12: Add 5 wt% manganese salt transition metal salt on a dry basis to the sludge treated in step S11, and stir for 10 minutes to complete sludge conditioning;

[0053] S13: dehydrating the sludge conditioned in step S12 through plate and frame dehydration.

[0054] After testing, the specific resistance of sludge filtration is changed from the original 1.88×10 13 m / kg down to 1.24×10 11 m / kg, the capillary water absorption time of the sludge decreased from 156.2s of the original sludge to 42.5s, the moisture content of the conditioned sludge was 55.2%, and the organic matter of the sludge cake was 52.4% after dehydration by the plate and frame.

Embodiment 2

[0056] A method for deep dewatering of sludge, the process steps are as follows:

[0057] S21: Starting from the remaining sludge with an organic matter content of 55.2wt% and a water content of 97.1wt%, add hydrogen peroxide and peroxodisulfate with a mass ratio of 1:1 to the sludge at 5wt% on a dry basis Mixture free radical generator, stir well;

[0058] S22: Add 10wt% cobalt salt transition metal salt on a dry basis to the sludge treated in step S21, and after stirring for 10 minutes, add 10wt% slag powder with a particle size ≤ 1.0mm on a dry basis Auxiliary modifier, stirring to fully complete sludge conditioning

[0059] S23: dehydrating the sludge conditioned in step S22 through plate and frame dehydration.

[0060] After testing, the specific resistance of sludge filtration is changed from the original 1.88×10 13 m / kg down to 3.12×10 10 m / kg, the capillary water absorption time of the sludge decreased from 156.2s of the original sludge to 30.6s. After the conditio...

Embodiment 3

[0062] S31: Starting from the centrifuge dewatered cake with an organic content of 50.6wt% and a water content of 82.2wt%, adding water to slurry it to a water content of 93wt%, and then adding 10wt% of the sludge on a dry basis to the sludge Peroxobisulfate free radical generator, fully stirred;

[0063] S32: Add 10%wt aluminum salt transition metal salt on a dry basis to the sludge treated in step S31, and after stirring for 15min, add 5wt% isomeric alcohol polyoxyethylene polyoxypropylene ether to assist in improving Active agent, stirring to fully complete the sludge conditioning;

[0064] S33: dehydrating the sludge conditioned in step S32 through plate and frame.

[0065] After testing, the sludge filtration specific resistance is 2.82×10 when the slurry water content is 93%. 13 m / kg down to 6.5×10 11 m / kg, the capillary water absorption time of the sludge decreased from 194.5s to 34.5s when the slurry moisture content was 93%, the conditioned sludge was dehydrated by...

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Abstract

The invention provides a sludge deep dehydration method comprising the following steps: adding 1-10%, based on the dry weight of sludge slurry, of a free radical production into the sludge slurry, and stirring to mix; adding a transition metal salt activator, a magnesium salt activator and / or an aluminum salt activator to the sludge slurry containing the free radical production, carrying out an activation reaction to form active free radicals, and treating by the active free radicals to obtain a conditioned sludge slurry; and dehydrating the conditioned sludge slurry. Through the sludge deep dehydration method, the active free radicals are produced by reacting the transition metal salt, the magnesium salt and / or the aluminum salt and the like with the free radical production, on one hand, can effectively destroy sludge extracellular polymeric substances, alter surface properties of sludge particles, improve the filtration performance of the sludge, and reduce the sludge bound water content; on the other hand, the active free radicals can active ions produced after the completion of the reaction, can be combined with sludge particles, can improve the strength of sludge flocs, are favorable to the sludge dehydration process, so as to realize the sludge deep dehydration.

Description

technical field [0001] The invention belongs to the technical field of sewage sludge treatment, in particular to a sludge deep dehydration method. Background technique [0002] The so-called sludge is a general term for various sediments and floating objects produced in different treatment processes in water supply and urban domestic sewage treatment. There are mainly various pathogens, oxygen-consuming pollutants, plant nutrients, toxic and carcinogenic pollutants, general organic substances, and inorganic pollutants such as acids, alkalis, and salts. Due to the high content of organic matter in municipal sludge, its strong hydrophilicity and large specific surface area make it difficult to separate mud and water. At present, 83% of the sludge in our country's urban sewage treatment plants has not been effectively disposed of. Dehydration is difficult, and the efficiency of mechanical dehydration is low, which seriously affects the subsequent sludge disposal process. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 杨家宽时亚飞何姝王荣徐鑫李亚林毛苇张昊
Owner UNIVERSTAR SCI & TECH SHENZHEN
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