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A sludge hydrothermal treatment method for reducing heavy metals in water phase

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: 2022-05-20
SHENYANG AEROSPACE UNIVERSITY
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  • 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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  • A sludge hydrothermal treatment method for reducing heavy metals in water phase

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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 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 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 the surfactant obtained 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 surfactant-ultrasonic joint treatment sludge that step (3) obtains is joined in the intermittent high-temperature and high-pressure reactor, and the air in the reactor is re...

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

A sludge hydrothermal treatment method for reducing heavy metals in water phase belongs to the technical field of environmental protection. The method is as follows: mix the sludge raw material to be treated with a surfactant, stir for 0.5-1.5 hours, perform ultrasonic treatment, and then place the ultrasonic sludge in a reaction kettle under the protection of an inert gas at 5-15°C / min to raise the temperature to 180-240°C, keep it warm for 5-40 minutes, and then cool to room temperature to obtain a solid-liquid mixture. After solid-liquid separation, the obtained solid-phase product is dried to obtain a residue. The method combines raw material pretreatment and hydrothermal treatment to treat sludge, reduces the concentration of heavy metals in the water phase of sludge hydrothermal treatment, has the advantages of energy saving, environmental protection, pollution reduction, cost saving, etc., and can be applied in the field of sludge treatment. Deal with the principle of "three modernizations".

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 Patents(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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