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A kind of sludge dehydrating agent and its application method for reducing the moisture content of sludge and utilizing it as a resource

A technology of sludge dehydrating agent and water content, which is applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve problems such as limited dehydration effect, secondary pollution, complex components, etc. The effect of high mud resource utilization rate, improved calorific value, and wide range of sources

Active Publication Date: 2021-11-23
长沙坚诺环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of limited dehydration effect of existing sludge dewatering means, high cost, complex components, use of toxic components, and certain secondary pollution, the first purpose of the present invention is to provide a safe, effective, and low-cost sludge dewatering method. Sludge dewatering agent

Method used

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  • A kind of sludge dehydrating agent and its application method for reducing the moisture content of sludge and utilizing it as a resource
  • A kind of sludge dehydrating agent and its application method for reducing the moisture content of sludge and utilizing it as a resource

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The sludge comes from a sludge treatment and disposal site in Changsha, Hunan, with a moisture content of 78.6%. Add an appropriate amount of middle water, crush and dilute to prepare a total of 50kg of sludge with a water content of 96%, adjust its pH to 8 with lime, and then press W 干馏残渣 :W 干污泥 =0.8:1.0 mass ratio, add 1.60 kg of dry distillation residue made from non-caking coal at 650-700 °C and processed into a particle size range of 30-500 μm, react for 30 minutes under stirring, and then pump to an area of ​​0.5 m 2 , Diaphragm filtration is carried out on a XAYG0.5 / 630-U high-pressure diaphragm filter press with a squeezing pressure of 1.6MPa. Finally, 5.42kg of sludge filter cake is obtained, and its technical indicators are: moisture Mt is 37.20%, calorific value Qad,net is 3115kCal / kg, ash content Aad is 31.62%, volatile matter Vad is 31.01%, and sulfur content St,ad is 0.30 %, pH 8, can meet the requirements of continuous autonomous combustion.

Embodiment 2

[0046] The sludge comes from the sludge treatment and disposal center of Xiangtan City, Hunan Province, with a moisture content of 77.5%. Add an appropriate amount of press filtrate from previous tests, crush and dilute to prepare a total of 55 kg of sludge with a water content of 95%, adjust its pH to 10 with lime, and then press W 干馏残渣 :W 干污泥 =0.3:1.0 mass ratio, add 0.83kg of dry distillation residue made from weak caking coal at 650-700℃ and processed into a particle size range of 30-500μm, react for 15min under stirring, and then pump to an area of ​​0.5m 2 , Diaphragm filtration is carried out on a XAYG0.5 / 630-U high-pressure diaphragm filter press with a squeezing pressure of 1.9MPa. Finally, 5.31kg of sludge filter cake is obtained, and its technical indicators are: moisture Mt is 36.11%, calorific value Qad,net is 2406kCal / kg, ash content Aad is 34.51%, volatile matter Vad is 31.16%, and sulfur content St,ad is 0.15 %, pH10, can meet the requirements of continuous s...

Embodiment 3

[0048] The sludge comes from a sludge treatment and disposal site in Henan, with a moisture content of 79.2%. Add an appropriate amount of press filtrate from previous tests, crush and dilute to prepare a total of 100kg of sludge with a water content of 98%, adjust its pH to 9 with lime, and then press W 干馏残渣 :W 干污泥 =0.8:1.0 mass ratio, add 1.60 kg of dry distillation residue made from non-caking coal at 650-700 °C and processed into a particle size range of 30-500 μm, react for 30 minutes under stirring, and then pump to an area of ​​0.5 m 2 , Diaphragm filtration is carried out on a XAYG0.5 / 630-U high-pressure diaphragm filter press with a squeezing pressure of 1.7MPa. Finally, get 5.60kg of sludge filter cake, its technical indicators: moisture Mt is 39.30%, calorific value Qad,net is 3788kCal / kg, ash content Aad is 20.36%, volatile matter Vad is 36.85%, sulfur content St,ad is 0.32 %, pH 9, can meet the requirements of sustained autonomous combustion.

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Abstract

The invention belongs to the technical field of sludge treatment, and specifically relates to a sludge dehydrating agent, which is composed of lime and carbonization residue; the particle size of the carbonization residue is 30-500 μm, the hydrophobic angle is 91-97°, and the specific surface area is 220 ~300m 2 / g. The invention also provides a method for reducing the water content of the sludge and utilizing the sludge as a resource based on the sludge dewatering agent. The present invention innovatively finds that the dry distillation residue and lime with the particle size, hydrophobic angle and specific surface area have synergy in sludge dehydration, which can synergistically reduce the specific resistance of sludge and effectively improve the dewatering performance of sludge. Not only that, but also The calorific value of the treated sludge can be increased, so that the treated sludge can be directly used as solid fuel to realize high-value utilization.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a sludge dehydrating agent and a dehydration treatment method. Background technique [0002] Urban sludge is solid waste produced in the process of urban domestic sewage treatment, rich in organic matter, and its dry basis calorific value can normally reach 1600-3600kCal / kg. When urban sludge is used as energy, it is similar to biomass in many aspects, with high volatile content, low ignition temperature during combustion, and good combustion performance. However, in my country, the utilization rate of sludge resource utilization is less than 20%. The fundamental problem is that the sludge dewatering performance is poor and the sludge moisture is high, which cannot meet the corresponding technical requirements for sludge resource utilization, which hinders the industrialization of sludge resource utilization. implement. [0003] At present, the scale of urba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/143C02F11/145C10L5/46
CPCC10L5/46C10L2290/08C02F11/143C02F11/145Y02E50/10Y02E50/30
Inventor 陈映竹
Owner 长沙坚诺环境科技有限公司
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