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Method for comprehensively utilizing seabed sludge

A sludge and sodium hydroxide technology, applied in the field of environmental engineering, can solve problems such as environmental impact, waste of effective resources, full utilization, increase in production costs, etc., and achieve high yield, good economic and environmental benefits

Inactive Publication Date: 2020-04-14
TAIZHOU VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, seabed sludge has the characteristics of high water content and high salinity. The existing sludge carbonization technology dehydrates sludge and then carbonizes it at high temperature, which not only increases the production cost, but also does not involve the problem of high-salt biomass raw material treatment.
At the same time, seabed silt contains a lot of salt. If the carbonization liquid is discharged without treatment, it will not only affect the environment, but also waste the full use of effective resources.

Method used

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  • Method for comprehensively utilizing seabed sludge
  • Method for comprehensively utilizing seabed sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Suction the mud at the bottom of the tidal flat breeding pond, let it stand to remove the upper liquid, filter the solid part through an 80-mesh sieve, soak and activate it with 11% sodium hydroxide solution, the mass ratio of mud and sodium hydroxide solution is 1:4, stir for 2 hours, and let it stand Set aside for 12 hours, take the upper layer solution and adjust the pH value to 2.0 with hydrochloric acid solution, after standing still, remove the sediment in the lower layer, wash with distilled water for 3 times, and obtain humic acid after drying.

[0035] Add deionized water to the lower sediment after soaking the activated sludge with 11% sodium hydroxide solution, the ratio of the two is the lower sediment: the mass ratio of deionized water is 1:4, and place it in a high-pressure reactor for hydrothermal carbonization reaction. Before the temperature of the reaction kettle is raised, nitrogen gas is passed through the gas phase tube to the reaction chamber for 1...

Embodiment 2

[0038] Collect the seabed silt collected by the dredger, let it stand to remove the supernatant, filter the solid part through an 80-mesh sieve, soak and activate it with 14% sodium hydroxide solution, the mass ratio of sludge to sodium hydroxide solution is 1:5, and stir for 3 hours , stand still for 12 hours, take the upper layer solution and adjust the pH value to 2.2 with hydrochloric acid solution, after standing still, take the lower layer sediment, wash 3 times with distilled water, and obtain humic acid after drying.

[0039] Add deionized water to the lower sediment after soaking the activated sludge with 14% sodium hydroxide solution, the ratio of the two is the lower sediment: the mass ratio of deionized water is 1:3, and place it in an autoclave for hydrothermal carbonization reaction. Before the temperature of the reaction kettle is raised, nitrogen gas is passed through the gas phase tube to the reaction chamber for 15 minutes, and then the gas valve is tightened...

Embodiment 3

[0042] Collect the seabed silt collected by the dredger, let it stand to remove the supernatant, filter the solid part through an 80-mesh sieve, soak and activate it with 17% sodium hydroxide solution, the mass ratio of the sludge to the sodium hydroxide solution is 1:6, and stir for 3 hours , stand still for 12 hours, take the upper layer liquid and adjust the pH value to 2.4 with hydrochloric acid solution, after standing still, take the lower layer sediment, wash 4 times with distilled water, and obtain humic acid after drying.

[0043] Add deionized water to the lower sediment after soaking the activated sludge with 17% sodium hydroxide solution, the ratio of the two is the lower sediment: the mass ratio of deionized water is 1:5, and place it in an autoclave for hydrothermal carbonization reaction. Before the temperature of the reaction kettle is raised, nitrogen gas is passed through the gas phase tube to the reaction chamber for 15 minutes, and then the gas valve is tight...

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Abstract

The invention discloses a seabed sludge comprehensive utilization method, which comprises the following steps: soaking and activating seabed sludge by a sodium hydroxide solution after being pretreated, wherein the concentration range of the sodium hydroxide solution is 5%-20%; taking supernatant after activation treatment, adjusting the pH value, standing, taking sediments, washing and drying toobtain humic acid; taking the activated lower sediment, adding water, pyrolyzing, and carrying out centrifugal separation after the product is cooled to the room temperature to obtain a liquid part and a solid part; washing, drying and sieving the solid part obtained by centrifugal separation to obtain biochar prepared from seabed sludge; feeding the liquid part obtained by centrifugal separationinto an evaporation crystallizer, and carrying out evaporation crystallization to obtain sodium chloride. The method does not influence the environment, is simple to operate, is economical and feasible, can be used for preparing humic acid, biochar and a byproduct namely sodium chloride from seabed sludge, turns waste into wealth, and creates good economic benefit and environmental benefit.

Description

technical field [0001] The invention relates to the field of environmental engineering, in particular to a method for comprehensive utilization of seabed silt. Background technique [0002] my country has a long coastline, a large area of ​​offshore silt area, and rich seabed silt resources. At the same time, countless silt has accumulated in the waters of various docks and waterways along the coast; A large amount of silt produced by dredgers is transported to deep ocean waters and dumped or piled up on the coast to form beaches, which wastes the potential application value of silt; therefore, how to effectively and reasonably dispose of the silt excavated And development and utilization is a problem that needs to be faced. [0003] Seabed mud is rich in humic acid, humic acid is an amorphous polymer organic matter, its molecule contains conjugated double bonds, aromatic rings, quinone groups and semi-quinone groups, and is a natural soil conditioner; humic acid Widely pres...

Claims

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Application Information

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IPC IPC(8): C01D3/04C01B32/05C08H7/00
CPCC01D3/04C08H6/00C01B32/05
Inventor 娄欢于红艳张昕欣袁佳佳江欣
Owner TAIZHOU VOCATIONAL & TECHN COLLEGE
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