Method for activating persulfate with sludge-based biochar and synergistically removing tetracycline in water

A technology for activating persulfate and persulfate, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of reducing tetracycline effluent concentration, secondary pollution of water environment, etc. Optimize the sewage treatment process, realize energy saving and emission reduction, and solve the effect of secondary pollution of water environment

Inactive Publication Date: 2020-11-17
XUZHOU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] In view of the problems existing in the above-mentioned prior art, the present invention provides a method for synergistically removing tetracycline in water by activating persulfate based on sludge-based biochar, which reduces the effluent concentration of tetracycline while realizing resource utilization of excess sludge, and solves the problem to a great extent. Secondary pollution of water environment caused by metals

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  • Method for activating persulfate with sludge-based biochar and synergistically removing tetracycline in water
  • Method for activating persulfate with sludge-based biochar and synergistically removing tetracycline in water
  • Method for activating persulfate with sludge-based biochar and synergistically removing tetracycline in water

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Embodiment 1

[0031] Preparation of sludge-based biochar:

[0032] The remaining sludge from the municipal sewage treatment plant is directly dried. After drying, the moisture content of the sludge is controlled to <25%. The obtained dried sludge is crushed and passed through a 120-mesh polyethylene sieve. The particle size range is controlled to <20mm, and the treated sludge is put into a muffle furnace for pyrolysis. The temperature in the muffle furnace is controlled at 500°C, and the heating rate is 15°C / min. The sludge reaches the ideal temperature in the carbonization device After staying for 120 minutes, the solid product after pyrolysis is fully cooled and then taken out. The solid product after pyrolysis is washed with dilute hydrochloric acid and deionized water in sequence, and the sludge-based biochar is obtained after drying.

[0033] SEM analysis was carried out on the prepared sludge-based biochar, such as figure 1 As shown, it shows that the biochar cultured from sludge has...

Embodiment 2

[0043] Preparation of sludge-based biochar:

[0044]The remaining sludge from the municipal sewage treatment plant is directly dried. After drying, the moisture content of the sludge is controlled to <25%. The obtained dried sludge is crushed and passed through a 120-mesh polyethylene sieve. The particle size range is controlled to <20mm, and the treated sludge is put into a muffle furnace for pyrolysis. The temperature in the muffle furnace is controlled at 500°C, and the heating rate is 15°C / min. The sludge reaches the ideal temperature in the carbonization device After staying for 120 minutes, the solid product after pyrolysis is fully cooled and then taken out. The solid product after pyrolysis is washed with dilute hydrochloric acid and deionized water in sequence, and the sludge-based biochar is obtained after drying.

[0045] The two systems for removing tetracycline are: only sludge-based biochar, ferric ion + sludge-based biochar;

[0046] Specifically, ferric ions a...

Embodiment 3

[0052] Preparation of sludge-based biochar:

[0053] The remaining sludge from the municipal sewage treatment plant is directly dried. After drying, the moisture content of the sludge is controlled to <25%. The obtained dried sludge is crushed and passed through a 120-mesh polyethylene sieve. The particle size range is controlled to <20mm, and the treated sludge is put into a muffle furnace for pyrolysis. The temperature in the muffle furnace is controlled at 500°C, and the heating rate is 15°C / min. The sludge reaches the ideal temperature in the carbonization device After staying for 120 minutes, the solid product after pyrolysis is fully cooled and then taken out. The solid product after pyrolysis is washed with dilute hydrochloric acid and deionized water in sequence, and the sludge-based biochar is obtained after drying.

[0054] The two systems for removing tetracyclines are:

[0055] Only sludge-based biochar, ferric ion + sludge-based biochar + persulfate;

[0056] Sp...

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Abstract

The invention discloses a method for activating persulfate with sludge-based biochar and synergistically removing tetracycline in water. The method comprises the following steps: adding 15-35mg of sludge-based charcoal and 20mL of persulfate with the concentration of 270-330mg / L into 50mL of a tetracycline solution with the concentration of 120mg / L. According to the method, the tetracycline in thewastewater is efficiently removed while the sludge resource utilization is realized, the problems of secondary water environment pollution and the like caused by metal ions or complexes of the metalions are solved to a great extent, and the method has important significance for optimizing a sewage treatment process and realizing energy conservation and emission reduction. The specific surface area of the sludge-based biochar cultured from the excess sludge at high temperature is large and is 39.719 m<2 > / g, and the sludge-based biochar can be used as an excellent adsorption material due to more attachment sites on the surface and a large pore size area.

Description

technical field [0001] The invention relates to a method for synergistically removing tetracycline from water by activating persulfate with sludge-based biochar, and belongs to the technical field of sewage treatment. Background technique [0002] In recent years, the large-scale construction of urban sewage treatment plants has alleviated the environmental pollution of industrial wastewater and urban domestic sewage. However, due to the serious phenomenon of "heavy water and light mud", the effective treatment and resource utilization rate of sludge is only 25%. Surplus sludge is treated as solid waste after sewage treatment. It contains a large amount of organic matter and rich nitrogen, phosphorus, potassium and other elements. It also contains harmful substances such as antibiotics and heavy metals. If it is piled up randomly without effective treatment, it is very It is easy to cause secondary pollution to groundwater, soil, etc., directly threatens environmental safet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28C02F1/72B01J20/30C02F101/38
CPCB01J20/20C02F1/283C02F1/722B01J2220/4887C02F2101/38
Inventor 范秀磊刘宇邹晔锋李世斌刘加强李莹
Owner XUZHOU UNIV OF TECH
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