Sludge-dewatering compound conditioning agent and application method thereof

A technology of sludge dewatering and application method, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/concentrated sludge treatment, etc. Dehydration, water can not be released to the maximum extent, etc.

Active Publication Date: 2012-03-21
UNIVERSTAR SCI & TECH SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors found in the research that the above-mentioned existing physical and chemical conditioning can only solve the problem of removal of interstitial water and capillary water, and cannot destroy the highly hydrated charged floc matrix of sludge and EPS, and cannot change the floc The compressibility of the body is precisely due to the fact that in the process of the existing sludge filter press dehydration, the sewage outflow channel in the sludge is blocked due to the compressibility of the organic matter, so that the water contained in the sludge floc grid cannot be maximized. Released to a certain extent, that is, deep dehydration of sludge cannot be achieved

Method used

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  • Sludge-dewatering compound conditioning agent and application method thereof
  • Sludge-dewatering compound conditioning agent and application method thereof
  • Sludge-dewatering compound conditioning agent and application method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0071] A composite conditioner for sludge dehydration, comprising a weight ratio of 18:23 Fenton's reagent and a skeleton construct, wherein the Fenton's reagent contains H 2 SO 4 / FeSO 4 / H 2 o 2 Fenton system, the skeleton structure is lime powder.

[0072] The application method of the sludge dehydration composite conditioner is as follows:

[0073] Step S11: Take the mixed sludge with a water content of 99.0% from the urban sewage treatment plant, add H to the sludge 2 SO 4 / FeSO 4 / H 2 o 2 Fenton's reagent, the step of adding this Fenton's reagent is:

[0074] Step S111: Adding 50% H to the 96.0% thickened sludge 2 SO 4 Solution, adjust sludge pH=5;

[0075] Step S112: Adding FeSO to the sludge with pH=5 4 Aqueous solution of FeSO 4 The amount added is 3.0wt% of the sludge dry basis, and stirred for 2 minutes, so that FeSO 4 Mix well with sludge;

[0076]Step S113: Add FeSO 4 Add H to the sludge 2 o 2 , H 2 o 2 The dosage is 12.5wt% of the sludge dry ...

Embodiment 2

[0080] A composite conditioner for sludge dehydration, comprising a weight ratio of 17:23 Fenton's reagent and a skeleton construct, wherein the Fenton's reagent contains H 2 SO 4 / FeSO 4 / H 2 o 2 In the Fenton system, the skeleton structure is a mixed powder of lime and red mud with a weight ratio of 1:1.

[0081] The application method of this sludge dehydration composite conditioner is referring to step S11 to step S12 in embodiment 1, and the difference is that the moisture content of the concentrated sludge is 95.9%; H 2 SO 4 The concentration of the solution is 98%, and it adjusts the pH of the sludge to 3.5; after adding lime and red mud mixed powder, stir and mix until uniform.

[0082] After the pretreated sludge in Example 2 is dewatered by plate-and-frame filter press, the specific resistance reduction rate of the dehydrated sludge is 89%, and the CST reduction rate is 61%.

Embodiment 3

[0084] A composite conditioner for sludge dehydration, comprising a weight ratio of 17:23 Fenton's reagent and a skeleton construct, wherein the Fenton's reagent contains H 2 SO 4 / FeSO 4 / H 2 o 2 In the Fenton system, the framework structure is a mixed powder of lime and phosphogypsum with a weight ratio of 1:1.

[0085] The application method of this sludge dehydration composite conditioner is referring to step S11 to step S12 in embodiment 1, and the difference is that the moisture content of the concentrated sludge is 95.9%; H 2 SO 4 The concentration of the solution is 98%, and the pH of the sludge is adjusted to be 5; the mixed powder of lime and phosphogypsum is added and stirred until uniform.

[0086] After the sludge pretreated in Example 3 is dewatered by plate-and-frame filter press, the specific resistance reduction rate of the dehydrated sludge is 90%, and the CST reduction rate is 63%.

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Abstract

The invention provides a sludge-dewatering compound conditioning agent and an application method thereof. The sludge-dewatering compound conditioning agent comprises a Fenton reagent or / and similar Fenton reagent and a skeleton construct, and the weight ratio of the Fenton reagent or / and similar Fenton reagent and the skeleton construct is 1: (0.05-300); and the skeleton construct adopts a powder body. The application method comprises the following steps: adding the Fenton reagent or / and similar Fenton reagent into sludge slurry, and mixing for oxidation; and adding the skeleton construct into the sludge slurry with the Fenton reagent or / and similar Fenton reagent, and mixing. Due to synergy of the Fenton reagent or / and similar Fenton reagent and the powder type skeleton construct, extracellular polymeric substances in sludge can be destructed effectively, the compressibility of organic substances can be reduced, and the sludge dewatering performance of the sludge-dewatering compound conditioning agent can be improved greatly. The procedures of the application method are simple, the conditions can be controlled easily, the sludge dewatering time can be shortened, and the large-scale treatment of the sludge can be realized.

Description

technical field [0001] The invention belongs to the technical field of sewage sludge treatment, in particular to a sludge dehydration composite conditioner and an application method thereof. Background technique [0002] With the improvement of my country's water environment quality requirements, the amount of sewage treatment has increased year by year, and the amount of by-product sludge has continued to rise. Sludge usually needs to be conditioned and dehydrated before being disposed of by incineration, landfill, composting or building material utilization. The sludge with a moisture content of about 97% produced during conventional wastewater treatment is a hydrophilic organic aggregate mainly composed of extracellular polymers (EPS), with a branch and network structure similar to fluff, and the shape of the particles is irregular , large porosity; high organic matter content, easy to rot and smell; high moisture content, not easy to dehydrate. [0003] At present, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
CPCC02F11/08C02F2305/026C02F11/143C02F11/148Y02W10/40
Inventor 杨家宽刘欢何姝王荣杨昌柱时亚飞李亚林毛苇
Owner UNIVERSTAR SCI & TECH SHENZHEN
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