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Process for dechlorination of organic chloride through metal reduction assisted and strengthened by ultrasonic wave

An organic chloride, ultrasonic-assisted technology, applied in chemical instruments and methods, reduced water/sewage treatment, mechanical oscillation water/sewage treatment, etc., can solve problems such as long time, high requirements for engineering application conditions, and affecting mixed mass transfer , to achieve the effect of stable operation, simple device and easy operation

Inactive Publication Date: 2008-07-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] (2) The metal reducing agent is prone to compaction, which seriously affects the mixed mass transfer;
[0029] (3) Pd, the most effective catalyst at present, is too expensive;
[0030] (4) The preparation of polymetallic reducing agents and catalysts is complicated, and the requirements for engineering application conditions are high;
[0031] (5) The treatment efficiency for low-concentration polychlorinated organic compounds is low and the time is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1: The reducing agent is zero-valent iron powder, which is mechanically mixed with activated carbon filler in a ratio of 1:3, packed into a fixed bed, and the packed layer D*H=800*1500mm, divided into 2 sections, with ultrasonic frequency at 50kHz, acoustic Strong at 30W / cm 2 , the wastewater flow rate is 750L / h, the concentration of carbon tetrachloride in the wastewater influent is 14mg / L, under the conditions of room temperature and atmospheric pressure, the hydraulic retention time is 30min, and the concentration of carbon tetrachloride in the treated effluent is 0.8mg / L.

Embodiment 2

[0068] Embodiment 2: The reducing agent is zero-valent zinc particles, which are mechanically mixed with quartz sand filler in a ratio of 1:4, packed into a fixed bed, and the packed layer D*H=1500*3000mm is divided into 3 sections, and the ultrasonic frequency is at 130kHz. Sound intensity at 75W / cm 2 , The wastewater flow rate is 2500L / h, under the conditions of room temperature and atmospheric pressure, the concentration of chloroform in the wastewater influent is 50mg / L, the hydraulic retention time is 240min, and the chloroform in the treated effluent is 2.7mg / L.

Embodiment 3

[0069] Example 3: The reducing agent is aluminum powder, which is mechanically mixed with zeolite filler in a ratio of 1:3, packed into a fixed bed, packed with D*H=800*5000mm, divided into 5 sections, with ultrasonic frequency at 30kHz and sound intensity at 40W / cm 2 , the wastewater flow rate is 600L / h, under the conditions of room temperature and atmospheric pressure, the concentration of dichlorophenol in the wastewater influent is 4.2mg / L, the hydraulic retention time is 150min, and the concentration of dichlorophenol in the treated effluent is 0.3mg / L.

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PUM

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Abstract

The invention discloses a hyperacoustic assisting and strengthening metal deacidizing organochloride antichloration method, which comprises the following steps: (1) choosing nulvalent metal or metal alloy as reducer to form powder, granule or clastic; (2) adujsting the organochloride waste water to acidic property or neutral; (3) filling or adding (1) reducer in reaction unit to react with (2) organochloride waste water; (4) installing supersonic generator in reaction unit to send supersonic wave to water body; strengthening the course of organic chlorine deacidizing and antichlorating by reducer; (5) discharging waste water which strengthened antichloration treatment by supersonic wave. The invention simplifies the handing, which possesses steady operation.

Description

technical field [0001] The invention relates to water pollution control and treatment technology, in particular to a method for removing organic chlorides in waste water. Background technique [0002] Organic chlorides (also called chlorinated organic compounds) are the products of aliphatic hydrocarbons, aromatic hydrocarbons and their derivatives after one or several hydrogen atoms are replaced by chlorine atoms, including chlorinated aliphatic hydrocarbons, chlorinated aromatic hydrocarbons, etc. Chlorine organic compounds. There are many kinds of organic chlorides, which are important chemical raw materials (such as chlorotoluene), pharmaceutical intermediates, solvents (such as carbon tetrachloride) and products (such as organochlorine pesticides), and are widely used in chemical industry, medicine, pesticide, leather, Machinery, wood preservation and other industries, they enter the environment through volatilization, container leakage, waste water discharge, use of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/70C02F1/66C02F1/36
Inventor 官宝红孟亚锋吴忠标曾爱斌邹有良
Owner ZHEJIANG UNIV
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