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River bottom mud stabilizing and recycling method

A river sediment and stabilization technology, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of less research on resource utilization, achieve resource utilization, and realize non-toxic Harmful and stabilized remediation treatment, and the effect of solving the problem of sediment disposal

Active Publication Date: 2018-07-06
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the restoration of river sediment has just begun, and there are few researches on resource utilization. It is necessary to further expand its restoration technology and resource utilization direction

Method used

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  • River bottom mud stabilizing and recycling method

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Experimental program
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Effect test

Embodiment 1

[0024] A method for stabilization and resource utilization of river sediment, comprising the following steps:

[0025] (1) if figure 1 As shown, the river sediment produced by river channel dredging is placed in the concentration tank for gravity sedimentation and concentration, and the concentration of the sediment after concentration is 15g / L;

[0026] (2) Pump the concentrated bottom sludge into the hydrothermal closed reaction tank. The injection amount of the concentrated bottom sludge is 50% of the volume of the reaction tank. The steam heating method is used to seal and heat the sludge in the tank to a temperature of 180°C. Keep for 120min;

[0027] (3) The material after cooling is transported to the regulating tank, and treated by centrifugal dehydration to obtain hydrothermal liquid and hydrothermal solid products;

[0028] (4) The hydrothermal liquid adopts the method of secondary hydrothermal treatment, and the hydrothermal liquid is injected into the hydrotherma...

Embodiment 2

[0031] A method for stabilization and resource utilization of river sediment, comprising the following steps:

[0032] (1) if figure 1 As shown, the river sediment is deposited and concentrated in the concentration tank, and the concentrated sediment concentration is 20a / L;

[0033] (2) pump the concentrated bottom sludge into the high-pressure closed reaction tank, the injection amount of the sludge is 70% of the volume of the high-pressure closed reaction tank, heat with heat transfer oil, and heat the sludge in the tank until the temperature of the tank is 180°C. Keep for 160min;

[0034] (3) After the reaction is finished, the material is cooled and unloaded to the regulating tank, and dehydrated by plate and frame filter press to obtain hydrothermal liquid and hydrothermal solid products;

[0035] (4) The hydrothermal liquid adopts the method of secondary hydrothermal treatment, and the hydrothermal liquid is injected into the hydrothermal airtight reaction tank, and th...

Embodiment 3

[0038] A method for stabilization and resource utilization of river sediment, comprising the following steps:

[0039] (1) if figure 1 As shown, the spoiled sediment obtained by river channel dredging is pumped into the concentration tank for sediment concentration, and the concentration of the concentrated sediment is 20g / L;

[0040] (2) pump the concentrated sludge into the hydrothermal closed reaction tank, the injection amount of the sludge is 80% of the volume of the carbonization reaction tank, and steam is heated to the temperature of the sludge in the tank to be 200°C, and kept for 200min;

[0041] (3) After the reaction is completed, the temperature is lowered, and the material is transported to the regulating tank, and dehydrated by plate and frame filter press to obtain hydrothermal liquid and hydrothermal solid products.

[0042] (4) The hydrothermal liquid adopts the method of secondary hydrothermal treatment, and the hydrothermal liquid is injected into the hydr...

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Abstract

The invention discloses a river bottom mud stabilizing and recycling method. The river bottom mud stabilizing and recycling method is characterized by comprising the following steps: settling and concentrating river bottom mud by virtue of gravity, performing hydrothermal reaction for a given time at a given temperature, cooling after the reaction is ended, and dehydrating, thus obtaining a hydrothermal solid product and a hydrothermal solution; re-feeding the hydrothermal solid product into a river to adsorb nitrogen, phosphorus and heavy metals in a water body and gradually load microorganisms, thereby further purifying the river water body; adding polymeric ferric aluminum chloride and NaOH into the obtained hydrothermal solution, performing the secondary hydrothermal reaction, removingorganic matters and heavy metals released in the hydrothermal solution in the hydrothermal process of the bottom mud, and returning treated supernatant to the river water body. By adopting the method, while the stabilization and harmless treatment of the river bottom mud are realized, the bottom mud can be recycled. The method has the advantages of simple operation, easy engineering, and capability of providing a feasible method for stabilizing and recycling the river bottom mud.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for stabilization and resource utilization of river bottom mud. Background technique [0002] In recent years, with the rapid development of industry, water bodies such as rivers and lakes have been severely polluted. Pollutants enter water bodies through atmospheric deposition, wastewater discharge, rainwater leaching and scouring, among which a large amount of refractory pollutants accumulate in the sediment of water bodies. and gradually enriched. Sediment mainly contains three types of pollutants. One is heavy metals, generally referring to Hg, As, Zn, Cu, etc., which have the characteristics of refractory, ecological toxicity, and accumulative properties. And deposited in the bottom mud; the second is organic matter, the toxic organic matter in the bottom mud reaches a higher concentration in the organism through enrichment, thereby pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
CPCC02F11/00C02F2103/007C02F2303/06
Inventor 陈红薛罡刘振鸿安婧钱雅洁李响张文启孙敏余广杰袁健李前
Owner DONGHUA UNIV
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