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Sludge hydro-thermal treatment method for reducing heavy metal in aqueous phases

A heat treatment method and heavy metal technology, applied in water/sludge/sewage treatment, sludge treatment, water pollutants, etc., to achieve the effect of reducing concentration

Active Publication Date: 2019-04-12
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for reducing heavy metals in the water phase by combining cationic surfactant pretreatment and ultrasonic pretreatment for the modification of sludge in view of the situation of residual heavy metals in the liquid phase in the current sludge hydrothermal treatment method. Sludge hydrothermal treatment method, which is a new method of chemical pretreatment-physical pretreatment-hydrothermal liquefaction treatment combined treatment of sludge

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  • Sludge hydro-thermal treatment method for reducing heavy metal in aqueous phases

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Embodiment 1

[0044] A sludge hydrothermal treatment method for reducing heavy metals in the water phase, comprising the following steps:

[0045] (1) 50g of municipal sludge raw material with a water content of 90% and 0.5g of surfactant are mixed, wherein, by mass ratio, sludge raw material dry basis:surfactant=1:0.1, surfactant is CTAC, and mixed after the sludge;

[0046] (2) The mixed sludge obtained in step (1) is stirred with a mechanical stirrer at a rate of 150 to 200 rpm for 1 hour to obtain surfactant pretreated sludge;

[0047] (3) Ultrasonic treatment is carried out to the sludge pretreated by surfactant in step (2), the ultrasonic power is 180W, the ultrasonic time is 40min, and the duty ratio is 50%, to obtain the sludge treated by surfactant-ultrasonic joint treatment ;

[0048] (4) The sludge obtained by the surfactant-ultrasonic joint treatment in step (3) is added in the intermittent high-temperature and high-pressure reactor, and the air in the reactor is replaced with...

Embodiment 2

[0055] A sludge hydrothermal treatment method for reducing heavy metals in the water phase, comprising the following steps:

[0056] (1) 50g of municipal sludge raw material with a water content of 90% and 0.5g of surfactant are mixed, wherein, by mass ratio, sludge raw material dry basis:surfactant=1:0.1, surfactant is CPAM, and mixed after the sludge;

[0057] (2) The mixed sludge obtained in step (1) is stirred with a mechanical stirrer at a rate of 150 to 200 rpm for 1 hour to obtain surfactant pretreated sludge;

[0058] (3) Ultrasonic treatment is carried out to the sludge pretreated by surfactant in step (2), the ultrasonic power is 180W, the ultrasonic time is 40min, and the duty ratio is 50%, to obtain the sludge treated by surfactant-ultrasonic joint treatment ;

[0059] (4) The sludge obtained by the surfactant-ultrasonic joint treatment in step (3) is added in the intermittent high-temperature and high-pressure reactor, and the air in the reactor is replaced with...

Embodiment 3

[0066] A sludge hydrothermal treatment method for reducing heavy metals in the water phase, comprising the following steps:

[0067] (1) 50g of municipal sludge raw material with a moisture content of 90% and 0.5g of surfactant are mixed, wherein, by mass ratio, sludge raw material dry basis:surfactant=1:0.1, surfactant is CTAB, and mixed after the sludge;

[0068] (2) The mixed sludge obtained in step (1) is stirred with a mechanical stirrer at a rate of 150 to 200 rpm for 1 hour to obtain surfactant pretreated sludge;

[0069] (3) Ultrasonic treatment is carried out to the sludge pretreated by surfactant in step (2), the ultrasonic power is 180W, the ultrasonic time is 40min, and the duty ratio is 50%, to obtain the sludge treated by surfactant-ultrasonic joint treatment ;

[0070] (4) The sludge obtained by the surfactant-ultrasonic joint treatment in step (3) is added in the intermittent high-temperature and high-pressure reactor, and the air in the reactor is replaced w...

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Abstract

The invention discloses a sludge hydro-thermal treatment method for reducing heavy metal in aqueous phases, and belongs to the technical field of environment protection. The method includes the stepsthat to-be-treated sludge raw materials and a surface active agent are mixed and stirred for 0.5 h to 1.5 h and then subjected to ultrasonic treatment, sludge after ultrasonic treatment is put into areaction kettle, inert gas shielding is carried out, the temperature is increased to 180 DEG C to 240 DEG C at 5 DEG C / min to 15 DEG C / min, the temperature is kept for 5 min to 40 min and then reducedto the room temperature through cooling, and a solid-liquid mixture is obtained; after solid-liquid separation is carried out, the obtained solid phase product is dried, and then residues are obtained. According to the sludge hydro-thermal treatment method for reducing the heavy metal in the aqueous phases, sludge is subjected to joint treatment through raw-material pretreatment and hydro-thermaltreatment, and the concentration of the heavy metal in the aqueous phases in the sludge hydro-thermal treatment process is reduced; the sludge hydro-thermal treatment method has the advantages of being capable of saving energy, environmentally friendly, capable of reducing pollution, reducing the cost and the like, can be applied to the field of sludge treatment, and meets the sludge treatment principles of 'reduction, recycling and harmlessness'.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a sludge hydrothermal treatment method for reducing heavy metals in water phase. Background technique [0002] Sludge is a by-product produced during the treatment of domestic sewage and industrial wastewater by municipal sewage treatment plants. According to statistics, in 2017, my country's annual sludge output exceeded 40 million tons (based on a moisture content of 80%). Sludge itself is regarded as a solid waste because it contains a large amount of harmful substances, and it is also regarded as a resource because it contains a large amount of nutrients and rich organic matter. [0003] The heat treatment technology of sludge includes drying treatment technology and hydrothermal treatment technology. Among them, the sludge hydrothermal treatment technology is a clean conversion technology that directly utilizes sludge and other wastes with high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C02F101/20
CPCC02F11/00C02F11/10C02F2303/06C02F2101/20Y02P10/20
Inventor 李润东刘恩会杨天华李秉硕开兴平孙洋
Owner SHENYANG AEROSPACE UNIVERSITY
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