CN111018277A

CN111018277A - Chelating agent for reducing copper content in sludge during sludge treatment and application

Info

Publication number: CN111018277A
Application number: CN201911273574.5A
Authority: CN
Inventors: 赵志杰; 卢焕兼; 林健汉; 曾俊安; 陈吉甜; 叶迪城
Original assignee: Guangzhou Luojia Environmental Technology Co ltd
Current assignee: Guangzhou Luojia Environmental Technology Co ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-04-17

Abstract

The invention relates to a chelating agent for reducing the copper content in sludge during the treatment of contaminated sludge and the use thereof. The chelating agent consists of the following components in percentage by mass: 0.1mol/L borax buffer solution 1.5%; 0.5-1.0% of sodium diethyldithiocarbamate and 0.5-1.0% of monopotassium phosphate; when the chelating agent is used for reducing the copper content in the polluted sludge, 1.5 percent of borax buffer solution (pH 9.25) with the concentration of 0.1mol/L is added into the sludge to be treated according to the total amount of the taken sludge, and the mixture is stirred uniformly and then stands for 5 minutes; then adding 0.5-1.0% of sodium diethyldithiocarbamate, stirring uniformly, and standing for 5 minutes; and adding 0.5-1.0% of monopotassium phosphate, uniformly stirring and standing for 2 hours, and treating and reducing copper in the polluted sludge. The copper content of the polluted sludge treated by the chelating agent can be greatly reduced, and the problem of heavy metal copper pollution in the polluted sludge is effectively reduced.

Description

Chelating agent for reducing copper content in sludge during sludge treatment and application

Technical Field

The invention relates to a chelating agent for reducing the copper content in sludge during the treatment of polluted sludge and an application thereof in the environmental field.

Background

In 2016, 2 and 18 months, a house, a city and countryside construction department and an environmental protection department jointly release a black and odorous water body list of built-up areas of cities in the whole country, and mark that black and odorous water bodies of built-up areas of more than 200 levels of cities in the whole country are officially opened to form a large curtain. A large number of people live in cities, rivers have important effects on the water environment of the cities, such as great influence on landscapes, and property developers know that houses built beside very good rivers can be sold at high prices. However, if these rivers become black and odorous, they are completely different. The occurrence of black and odorous water bodies buries the most valuable water resources in cities, and the consequences caused by the black and odorous water bodies are very serious. In the last two decades, the amount of black and odorous water in cities in China has increased dramatically, which seriously affects the appearance and appearance of the cities and the living standard of surrounding residents. The black and odorous water is seriously polluted, and not only can not be directly used as a drinking water source, but also can pollute the drinking water source. The black and odorous water may finally flow into rivers and lakes or seep into the ground, which may cause pollution to rivers, lakes, underground water and surface water, resulting in inestimable loss. Therefore, the country issues ten items of water to comprehensively guide and supervise the treatment of the black and odorous water body.

The black and odorous sludge in rivers and lakes can be twinned with black and odorous water. The black and odorous sludge plays a role in assisting the elbow and the elbow of the black and odorous water body of the river and the lake and is one of the bases for aggravation and continuation of the black and odorous water body of the river and the lake. Therefore, in order to treat the black and odorous water body, the black and odorous sludge must be treated first. In the treatment of black and odorous sludge, the removal of heavy metals is an important step. The heavy metal pollutants in the black and odorous sludge are mercury, zinc, chromium, lead, cadmium and copper, and the pollution degrees are that zinc, mercury, cadmium, copper, lead and chromium are sequentially polluted; the comprehensive pollution indexes of the heavy metals are obviously different in different drainage basins, and each pollution zone is continuously distributed.

Disclosure of Invention

The invention aims to provide a chelating agent for reducing the copper content in polluted sludge and application thereof, which are used for treating the polluted sludge to reduce the heavy metal copper content. The invention adopts borax buffer solution (pH is 9.25) to maintain the acid-base of an experimental system for chelating copper in black and odorous sludge in the process of proceedingDegree; then sodium diethyldithiocarbamate (C) was used in sequence₂H₅)₂NCSSNa·3H₂O (DDTC) and KH₂PO₄To chelate the copper in the black sludge.

The technical scheme of the invention is as follows:

a chelating agent for reducing the copper content of sludge during the treatment of contaminated sludge, characterized in that: the composition comprises the following components in percentage by mass: 0.1mol/L borax buffer solution: 1.5 percent;

sodium diethyldithiocarbamate (C)₂H₅)₂NCSSNa·3H₂O(DDTC)：0.5～1.0％；

Potassium dihydrogen phosphate KH₂PO₄：0.5～1.0％。

Use of a chelating agent for reducing the copper content of sludge in the treatment of contaminated sludge, characterized in that: adding 1.5% borax buffer solution (pH 9.25) with concentration of 0.1mol/L into the sludge to be treated, stirring uniformly, and standing for 5 min; then adding 0.5-1.0% of sodium diethyldithiocarbamate, stirring uniformly, and standing for 5 minutes; and adding 0.5-1.0% of monopotassium phosphate, uniformly stirring and standing for 2 hours, and reducing the copper content in the polluted sludge.

The sludge treated by the chelating agent has reduced copper content, and effectively reduces the heavy metal copper pollution problem in the sludge.

Detailed Description

The present invention will be further described with reference to examples.

Example 1. (the sludge taken, the amounts of the components used and the treatment steps are shown in Table 1.)

Table 1.

Example 2. (the sludge taken, the amounts of the components used and the treatment steps are shown in Table 2.)

Table 2.

Claims

1. A chelating agent for reducing the copper content of sludge during the treatment of contaminated sludge, characterized in that: the composition is characterized by comprising the following components in percentage by mass:

0.1mol/L borax buffer solution: 1.5 percent;

Potassium dihydrogen phosphate KH₂PO₄：0.5～1.0％。

2. Use of a chelating agent as claimed in claim 1, characterized in that: adding 1.5% borax buffer solution (pH 9.25) with concentration of 0.1mol/L into the sludge to be treated, stirring uniformly, and standing for 5 min; then adding 0.5-1.0% of sodium diethyldithiocarbamate, stirring uniformly, and standing for 5 minutes; and adding 0.5-1.0% of monopotassium phosphate, uniformly stirring and standing for 2 hours, so that the copper content in the polluted sludge is greatly reduced.