Active carbon and modification method as well as application thereof in processing water containing endocrine disrupters

An activated carbon and modified technology, applied in the direction of adsorbed water/sewage treatment, etc., can solve the problems of pollution, high technical cost, difficult adsorption efficiency of activated carbon, etc., to extend service life, improve adsorption efficiency, large adsorption capacity and renewable sexual effect

Inactive Publication Date: 2009-08-26
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, due to the serious deterioration of water quality, a large number of toxic and harmful pollutants have been continuously detected in the water: persistent organic pollutants (POPs), disinfection by-products (DBPs), triple pollutants, endocrine disruptors (EDs), etc., Among the many organic pollutants, endocrine disruptors have been proposed as an independent environmental problem due to their different hazards. Systematic studies have shown that such pollutants will produce biomagnification effects in the process of water recycling. Conventional water treatment The processing capacity of the process is very limited, and it is difficult to meet the national drinking water standards
On the other hand, with the development of industrial production, the discharge of sewage and wastewater containing a large amount of endocrine disruptors has increased year by year, and the types have increased year by year. The discharge into water bodies without proper treatment has caused more serious pollution. Wastewater must also be treated
At present, more research is carried out on the use of advanced oxidation technology to treat polluted raw water. However, certain harmful by-products (such as bromate substances) will be produced during the treatment process. In addition, the technical cost is high and the existing water treatment process is difficult to transform. However, it has not been widely used; activated carbon adsorption to remove organic/inorganic pollutants in the water environment has been con

Method used

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specific Embodiment approach 1

[0018] Specific embodiment one: The treatment method of the activated carbon modification of the present embodiment is as follows: the activated carbon with particle size between 40 mesh and 10 mesh is placed in the quartz tube of the muffle furnace, and hydrogen gas is first passed through the muffle furnace for 1 hour at room temperature. hour, the gas flow rate was 50 ml / min, and then under the protection of the same hydrogen flow, the muffle furnace was heated to 600°C at a rate of 10°C / min and kept for 3 hours. After the temperature dropped to 30°C, the hydrogen flow was stopped. Continue to pass air at a flow rate of 50 ml / min for 1 hour, take out the activated carbon, put it and hydrochloric acid (35%) at a mass ratio of 10%, and boil it under reflux for 3 hours. After the end, wash the carbon sample with deionized water to chloride ions If there is no detection, it is modified carbon. Activated carbon needs to be washed repeatedly with deionized water before modificati...

specific Embodiment approach 2

[0019]Specific embodiment two: the water treatment method of the present invention is implemented according to the following process: the water after the traditional water treatment process is processed enters the reactor that modified charcoal is housed, and charcoal exists in fluidized bed form or fixed bed form therein, and control The residence time of water in the activated carbon bed is 10-60 minutes, and the water flow velocity is 1-15 m / hour. When the fluidized bed form is adopted, the modified carbon is loaded into the reactor from the top of the reactor, the raw water enters from the bottom of the reactor in a downstream manner, and the activated carbon is in a flowing state in the reactor; when the fixed bed form is adopted, the modified carbon is loaded in advance. Into the reactor, the height of the carbon bed is between 0.5m and 2m, and the raw water can enter the reactor in three ways, namely the downstream type (the raw water enters from the bottom right and exi...

specific Embodiment approach 3

[0020] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the reactor filled with modified charcoal is a multi-cascade reactor in the form of a plurality of circular tube reactors connected in series, and the charcoal is contained in it. It exists in the form of a fixed bed, and the filling height of carbon in each tube is 0.5 meters to 2 meters. The raw water enters the reactor in a forward or countercurrent manner, and the residence time of the water in the activated carbon bed is controlled to be 10 to 60 minutes. The water flow rate is 1 to 15 meters per hour. This embodiment can ensure that the water quality of the seriously polluted raw water reaches the safety standard.

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Abstract

The invention provides active carbon and modification method as well as application thereof in processing water containing endocrine disrupters. The active carbon is arranged in a muffle furnace silica tube; under the room temperature, hydrogen is pumped into the muffle furnace at first for 0.5 to 1.5 hours; the hydrogen flowing speed is 40 to 60ml/minute; then under the protection of the same hydrogen flow, the temperature of the muffle furnace is raised to 500-900 DEG C by the speed of 10 DEG C/minute and then the temperature is maintained for 1 to 5 hours; after the temperature is reduced to 30 DEG C, hydrogen pumping is stopped; then the air is pumped continuously for one hour by the flux of 40 to 60ml/minute; then the active carbon is taken out, and is added into a container together with muriatic acid with a volume by volume concentration of 35 percent according to a weight percentage of 10 percent for boiling and reflowing for 2 to 4 h; then de-ionized water is used for leading the sample of the active carbon to be detected without chloridion to obtain the modified active carbon. The modified active carbon prepared by the invention is used as a sorbent in the treatment process and has larger absorption capacity and renewable performance than that of raw carbon, and can realize to completely remove the endocrine disrupters under lower carbon inputting amount.

Description

(1) Technical field [0001] The present invention relates to a modified activated carbon. The present invention also relates to a method for modifying activated carbon. The present invention also relates to the application of modified activated carbon as an adsorbent in water treatment for absorbing and removing endocrine disruptors. (2) Background technology [0002] In recent years, due to the serious deterioration of water quality, a large number of toxic and harmful pollutants have been continuously detected in water: persistent organic pollutants (POPs), disinfection by-products (DBPs), three-cause substances, endocrine disruptors (EDs), etc., Among the many organic pollutants, endocrine disruptors have been proposed as an independent environmental problem due to their different hazards. Systematic studies have shown that such pollutants will produce biomagnification effects in the process of water recycling. Conventional water treatment The processing capacity of the pr...

Claims

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Application Information

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IPC IPC(8): C01B31/08C02F1/28
Inventor 刘桂芳李旭春关春雨任芝军朱丽楠刘慧马军
Owner HARBIN ENG UNIV
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