Method for processing organic chloride and heavy metal polluted bed mud

A technology of organic chloride and polluted bottom sludge, applied in sludge treatment, water/sludge/sewage treatment, sludge treatment through temperature control, etc., can solve high melting temperature, high investment and operating costs, fly ash and smoke Harmlessly deal with system complexity and other issues, to achieve the effect of cutting manufacturing prices, reducing operating costs, and reducing equipment investment

Inactive Publication Date: 2006-12-27
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

This invention adopts the secondary combustion treatment of flue gas, but the harmless treatment system of fly ash and smoke is complicated, and the melting temperature is high, and sulfur-fixing and chlorine-fixing agents need to be added, which leads to high investment and operating costs
At the same time, it also fails to solve the problem of harmless treatment of contaminated bottom sludge containing toxic heavy metals such as dioxin and chromium and cadmium
[0006] At present, there is no published patent on sediment treatment technology for sediment containing dioxins and other organic chlorides and heavy metals in my country.

Method used

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  • Method for processing organic chloride and heavy metal polluted bed mud

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Embodiment

[0036] 1. Implementation conditions:

[0037] (1) Sludge source: Suzhou River bottom sludge in Shanghai, China

[0038] (2) Composition of sludge:

[0039] Heavy metals (mg kg -1 )

[0040] "CODcr" refers to chemical oxygen demand (chemical oxygen demand), the total amount of dioxins represents the sum of three organic chlorides (PCDFs+PCDDs+PCBs), and the concentration is expressed in TEQ (Toxic Equivalency Quantity).

[0041] (3) Bottom mud moisture content: 50%;

[0042] (4) Air excess coefficient: 0.9, natural gas burns in the combustion furnace anoxic, and the internal heating rotary kiln is a reducing atmosphere;

[0043] (5) The flame temperature of the reduction combustion furnace anoxic combustion is 1150°C;

[0044] (6) The indirect heating gas outlet temperature of the preheated and dried externally heated rotary kiln is 400°C, and the residence time of the bottom sludge in the externally heated rotary kiln is 60min;

[0045] (7) After drying, the ...

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Abstract

The invention discloses a disposing method of organic chloride and heavy metal polluted sludge, which is characterized by the following: adopting anoxybiotic heat disposal method to heat through two rotary kilns; drying organic chlorinate in the external-heat rotary kiln indirectly; transmitting the volatilized gas in the reduced combustion furnace to decompose; heating the dried sludge through inner-heat typed swiveling kiln directly to carbonize common organic pollutant in the sludge; sealing heavy metal in the sludge or gasifying the tail gas; cooling the carbonized solid phase product to drain; transmitting heavy metal through spraying cooling tower in the cool water; recycling heavy metal through heavy metal chelant adsorbing column; discharging tail gas from flue through heat exchanging.

Description

technical field [0001] The invention relates to a method for treating organic chloride and heavy metal polluted bottom sludge, which removes organic chloride, other general organic matter and heavy metals in the sludge through heat treatment under carbon monoxide reducing atmosphere. The invention belongs to the technical field of heavily polluted bottom sludge treatment. Background technique [0002] In recent years, many harbors, rivers, lakes and other water sediments in China and other countries and regions have been detected to be contaminated with polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). Referred to as dioxins and polychlorinated biphenyls (PCBs) and other organic chlorides and mercury, chromium, cadmium and other toxic heavy metal pollution. Dioxin-like organic chlorides are the most toxic substances with strong carcinogenicity, reproductive toxicity, endocrine toxicity and immunosuppressive effects. They are characterized by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C02F11/18
Inventor 孔海南松村正利胡湛波
Owner SHANGHAI JIAO TONG UNIV
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