A method and system for hydrothermal treatment of concentrated sludge

A technology for thickening sludge and hydrothermal treatment, applied in the direction of sludge treatment through temperature control, can solve the problems of increasing equipment investment cost, increasing energy consumption, increasing processing procedures, etc., and achieves small footprint, simple structure, and economical treatment. effect of the program

Active Publication Date: 2021-09-03
四川深蓝环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for some low-concentration sludge, the water content is as high as 97%, and the mud and sand content is low (generally, the water content of sludge is about 80%, and the mud and sand content is high). , increases energy consumption, and is of little significance

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  • A method and system for hydrothermal treatment of concentrated sludge

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Embodiment 1

[0031] Such as figure 1 As shown, this embodiment provides a thickened sludge hydrothermal treatment system, which includes a thickened sludge tank 1 , a filter 2 , a heat exchanger 3 and a hydrothermal reactor 4 connected in sequence. The heat exchanger 3 is also connected with an anaerobic buffer tank 5 .

[0032] Thickened sludge pool 1 is used to collect and store concentrated sludge. A feed pump 11 is arranged between the thickened sludge tank 1 and the filter 2 to transport the thickened sludge in the thickened sludge tank 1 to the filter 2 for filtering. The filter 2 traps impurities such as particles, fibers and hair in the sludge to prevent the heat exchanger 3 from being blocked. The heat exchanger 3 can be a spiral plate heat exchanger or a casing heat exchanger in the prior art.

[0033] The heat exchanger 3 has a cold source medium outlet and a cold source substrate inlet, as well as a heat source medium outlet and a heat source substrate inlet. The outlet of ...

Embodiment 2

[0037] This embodiment provides a method for hydrothermal treatment of concentrated sludge, which is used in conjunction with the hydrothermal treatment system for concentrated sludge provided in Example 1, and is especially suitable for hydrothermal treatment of concentrated sludge, which includes the following steps:

[0038] Step 1: Collect the concentrated sludge in the concentrated sludge tank, use the released hydrothermal steam to perform a first-level pre-heating, and then transport it to the filter, filter it, enter the heat exchanger as a cold source medium, and exchange it through the heat exchanger After preheating, it enters the hydrothermal reactor for hydrothermal reaction.

[0039] Step 2: After the hydrothermal reaction, recover the released hydrothermal steam to preheat the concentrated sludge, and transport the liquid material as the heat source medium to the heat exchanger for heat exchange and cooling before collecting and processing.

Embodiment 3

[0041] This embodiment provides a method for hydrothermal treatment of concentrated sludge, which is used in conjunction with the hydrothermal treatment system for concentrated sludge provided in Example 1, and is especially suitable for hydrothermal treatment of concentrated sludge, which includes the following steps:

[0042] Step 1: Collect the sludge with a water content of 93-98% in the thickened sludge tank, use the released water heat steam to perform a first-stage pre-heating to 50-60°C, and then transport it to the filter, through a filter diameter of 8- It is filtered through a 12mm filter, and then enters the heat exchanger as a cold source medium. After heat exchange in the heat exchanger, it is pre-heated to 130-160°C and then enters the hydrothermal reactor for hydrothermal reaction. The heat source of the hydrothermal reaction is saturated steam. , The hydrothermal reaction is carried out under stirring conditions, and the reaction temperature is 180-200°C.

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Abstract

The invention discloses a concentrated sludge hydrothermal treatment method and system, and relates to the technical field of environmental protection. The hydrothermal treatment method of concentrated sludge of the present invention comprises: collecting concentrated sludge, filtering after first-stage pre-heating by venting steam, and then performing hydrothermal reaction after secondary pre-heating as a cold source medium through heat exchange by a heat exchanger; After the hydrothermal treatment, the released hydrothermal steam is recovered as the first-level pre-heating heat source, and the recovered liquid material is used as the heat source medium after being cooled by the heat exchanger and then collected and processed. This system is used in conjunction with the method described above. The present invention carries out hydrothermal reaction after filtering concentrated sludge and secondary pre-heating, avoids pre-dehydration, and saves treatment procedures; fully utilizes the waste heat of high-temperature materials after hydrothermal reaction, saves energy, and improves hydrothermal reaction efficiency; especially applicable It is suitable for small-scale and concentrated sludge treatment; its system structure is simple, it occupies a small area, saves equipment and operating costs, and is especially suitable for small-scale sewage treatment enterprises with limited land use.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a hydrothermal treatment method and system for concentrated sludge. Background technique [0002] With the continuous acceleration of our urbanization process, more and more urban pollutants are produced, and the harmless treatment of these pollutants has become an urgent problem to be solved. Municipal sludge has high water content and high organic matter content. Simple landfill, drying, incineration, land reuse and other treatment technologies are difficult to take into account the requirements of environmental protection, resource utilization and treatment costs, and are limited. Sludge anaerobic digestion gas production is considered to be the most promising sludge treatment technology and is widely promoted in my country, but practice shows that the digestion process directly using sludge as raw material has low gas production rate, long residence time, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/18
CPCC02F11/18
Inventor 邓舟张超夏洲吴瑞峰陈科宇金涛李刚
Owner 四川深蓝环保科技有限公司
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