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Combined conditioning agent for sludge deep dewatering and mud cake stabilization and application of combined conditioning agent

A deep dehydration and conditioning agent technology, applied in water/sludge/sewage treatment, sludge treatment, water pollutants, etc., can solve the problems of inactivation of parasite eggs and pathogens, etc., to achieve simple process and good effect , the effect of easily controllable conditions

Pending Publication Date: 2019-09-10
武汉市城市排水发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above sludge conditioning and mainly coagulants, flocculants, coagulants, surfactants, etc., change the sludge floc structure through adsorption bridging, net capture, and compression of the double layer, and add inert substances in the sludge compression In the process, it provides a rigid skeleton structure and maintains the sludge dehydration channel. The above functions can improve the dehydration performance of the sludge, but they cannot inactivate the parasite eggs and pathogens in the sludge EPS.

Method used

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  • Combined conditioning agent for sludge deep dewatering and mud cake stabilization and application of combined conditioning agent
  • Combined conditioning agent for sludge deep dewatering and mud cake stabilization and application of combined conditioning agent
  • Combined conditioning agent for sludge deep dewatering and mud cake stabilization and application of combined conditioning agent

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A method for deep dewatering of sludge, the process steps are as follows:

[0053] S1: Taking the remaining sludge with an organic content of 55.9wt% and a water content of 98.4wt% as a starting point, add magnesium hypochlorite with a sludge organic content of 26.5wt% to the sludge, and stir for 5 minutes;

[0054] S2: Add the iron trichloride of 45.2wt% of sludge organic matter content in the sludge after step S1 treatment, stir 10 minutes and finish sludge conditioning;

[0055] S3: Add the fly ash of 10wt% of sludge organic matter content in the sludge after step S2 treatment, stir 10 minutes and finish sludge conditioning;

[0056] S4: The sludge conditioned in step S3 is dehydrated by plate and frame.

[0057] After testing, the specific resistance of sludge filtration is 1.88×10 13 m / kg down to 0.12×10 13 m / kg, the capillary water absorption time of the sludge decreased from 172.7s of the original sludge to 29.8s, and the moisture content of the conditioned sl...

Embodiment 2

[0059] A method for deep dewatering of sludge, the process steps are as follows:

[0060] S1: With organic matter content being 45.2wt%, water content is 97.1wt% remaining sludge as starting point, in sludge, add the chlorine gas of sludge organic matter content 10.2wt%, stir 10 minutes;

[0061] S2: Add ferric chloride of 15wt% of sludge organic content to the sludge treated in step S1, and stir for 10 minutes; add polyacrylamide of 0.02wt% of sludge organic content to the sludge, stir 10 minutes;

[0062] S3: Add the 50wt% magnesite of sludge organic matter content in the sludge after step S2 treatment, stir 10 minutes and finish sludge conditioning;

[0063] S4: The sludge conditioned in step S3 is dehydrated by plate and frame.

[0064] After testing, the specific resistance of sludge filtration is 1.45×10 13 m / kg down to 0.07×10 13 m / kg, the capillary water absorption time of the sludge decreased from 156.2s of the original sludge to 25.1s, and the water content of th...

Embodiment 3

[0066] S1: With organic matter content being 49.5wt%, moisture content is 96.5wt% remaining sludge as a starting point, adding sodium hypochlorite with sludge organic matter content 20.1wt% to the sludge, stirring for 3 minutes;

[0067] S2: Add the aluminum chloride of 20wt% of sludge organic matter content in the sludge after step S1 treatment, stir 5 minutes;

[0068]S3: Add coal powder with an organic content of 180wt% to the sludge treated in step S2, and stir for 10 minutes to complete sludge conditioning;

[0069] S4: The sludge conditioned in step S3 is dehydrated by plate and frame.

[0070] After testing, the specific resistance of sludge filtration is 2.41×10 13 m / kg down to 0.09×10 13 m / kg, the capillary water absorption time of the sludge decreased from 268.2s of the original sludge to 30.1s, and the water content of the conditioned sludge was 56.5wt% after the plate and frame dehydration. The number of coliform bacteria in the mud cake decreased from 13566MPN / ...

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Abstract

The invention discloses a combined conditioning agent for sludge deep dewatering and mud cake stabilization and an application of the combined conditioning agent, and belongs to the technical field ofsludge treatment. The combined conditioning agent comprises a cell destructing reagent, a skeleton construct, and a conditioning agent for changing a floc structure of sludge; the cell destructing reagent is preferably a hypochlorite or chlorine gas, hypochlorous acid and derivatives of the hypochlorous acid produced in the conditioning process can penetrate an extracellular polymer of the sludgeand cell walls and oxidize intracellular matter, so that cells in the sludge are destructed, and harmful bacteria such as parasitic eggs and pathogens in the sludge are inactivated; coagulation and / or flocculation of the sludge by a coagulant and / or flocculant can further release extracellular and intracellular bound water of the sludge; and as an inert substance, the skeleton construct can maintain a water outlet channel of water in the sludge pressure filtration process, so that the sludge intracellular water released by the cell destruction can be quickly removed. The pretreatment method for the sludge provided by the invention can simultaneously achieve the dual purposes of deep dewatering of the sludge and inactivation of the harmful bacteria in the sludge.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and further relates to a combined conditioner for deep sludge dehydration and mud cake stabilization and its application. Background technique [0002] Municipal sludge is a by-product of sewage treatment. The cost of sludge incineration is huge, and at the same time, the malodorous gas will seriously affect the production and life of nearby residents. Therefore, the main sludge disposal methods in my country are still landfill and land utilization. Due to the high content of organic matter in the sludge, the dewatered sludge contains a large number of parasite eggs and pathogens, and there is a serious risk of secondary pollution if it is not properly disposed of. Therefore, it is urgent to develop a sludge pretreatment method for deep dehydration and stabilization of sludge. [0003] Sludge is composed of cells, extracellular polymeric substances (EPS for short) and inorganic substa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/122C02F11/148C02F101/30
CPCC02F11/00C02F11/122C02F2101/30C02F11/148
Inventor 杨家宽熊红松虞文波田中凯闻倩倩杜敬肖可可王宇梁莎陶爽奕
Owner 武汉市城市排水发展有限公司
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