Sludge dehydrator and sludge dehydration method

A sludge dehydrating agent and sludge dehydration technology, which is applied in the field of environmental governance and sludge treatment and disposal, to achieve the effects of simple equipment, lower specific resistance and moisture content, and higher dehydration efficiency

Inactive Publication Date: 2019-12-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method does not involve the improvement of sludge dewatering performance

Method used

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  • Sludge dehydrator and sludge dehydration method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A chemical plant produces concentrated sludge with a moisture content of 97% every day. According to the small test results of the sludge, a sludge deep dewatering conditioner is prepared. In each liter of sludge, the composition of agent A: 3.2g of ferric chloride hexahydrate; group B Divided into: 0.1g calcium chloride, 4.9g 30% hydrogen peroxide. First, agent A was added to the concentrated sludge with a moisture content of about 97%, and the mixture was stirred for 15 minutes, and then agent B was added, and the stirring was continued for 15 minutes. After the sludge is conditioned by the conditioner, it is injected into the plate and frame filter press by the sludge pump, and the specific resistance after conditioning is determined to be 2.8×10 10 m / kg, the specific resistance is reduced nearly ninety times, and the moisture content of the obtained dry sludge is 20%.

Embodiment 2

[0033] A chemical plant produces concentrated sludge with a moisture content of 94% every day. According to the small test results of the sludge, a sludge deep dewatering conditioner is prepared. In each liter of sludge, the composition of agent A: 9.3g aluminum chloride; the composition of agent B is: : 0.4g calcium oxide, 4.8g calcium carbonate. First add agent A to the concentrated sludge with a moisture content of about 94%, stir for 15 minutes, then add agent B into it, and continue stirring for 15 minutes. After the sludge was conditioned by the conditioner, it was injected into the plate and frame filter press by the sludge pump, and the specific resistance after conditioning was determined to be 4.7×10 10 m / kg, the specific resistance was reduced by more than fifty times, and the moisture content of the obtained dry sludge was 15%.

Embodiment 3

[0035] A chemical plant produces concentrated sludge with a moisture content of 93% every day. According to the small test results of the sludge, a sludge deep dewatering conditioner is prepared. In each liter of sludge, the composition of agent A: 6.8g ferrous sulfate heptahydrate; group B Divided into: 0.9g calcium oxide, 1.5g calcium chloride. First add agent A to the concentrated sludge with a moisture content of about 93%, stir for 15 minutes, then add agent B into it, and continue stirring for 15 minutes. After the sludge was conditioned by the conditioner, it was injected into the plate and frame filter press by the sludge pump, and the specific resistance after conditioning was determined to be 9.3×10 9 m / kg, the specific resistance was reduced by more than 200 times, and the moisture content of the obtained dry sludge was 17%.

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Abstract

The invention relates to a sludge dehydrator and a sludge dehydration method and belongs to technical fields of sludge treatment and environmental governance. The sludge dehydrator comprises an agentA and an agent B, wherein the agent A is a dehydration accelerant; and the agent B comprises a calcium salt and an oxide. The sludge dehydrator provided by the invention is adopted for sludge dehydration, the specific resistance of sludge can be within a range applicable to mechanical dehydration, the water content of the sludge can be reduced to 20% or less, the volume of the sludge can be reduced, and a basis is made for final disposal and application of the sludge.

Description

technical field [0001] The invention relates to a sludge dewatering agent and a sludge dewatering method, belonging to the field of sludge treatment and disposal and the technical field of environmental treatment. Background technique [0002] With the rapid development of the global society and economy, people's living standards have gradually improved, and environmental problems have also gradually increased. Among them, the problem of sewage and sludge has become more and more serious, and the amount of sewage discharge and treatment has gradually increased, and the corresponding amount of sludge generated has also increased. Therefore, how to effectively treat urban sludge and realize the harmlessness, resource utilization and high value of sludge has become an urgent problem that must be solved in our country. [0003] At present, domestic urban sewage treatment enterprises have insufficient disposal capacity, and the disposal methods are backward and a large amount of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/145C02F11/143C02F11/122
CPCC02F11/122C02F11/14
Inventor 严凯张曼仇荣亮
Owner SUN YAT SEN UNIV
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