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Application of municipal sludge in wastewater treatment

A technology for urban sludge and wastewater treatment, applied in water/sludge/sewage treatment, water/sewage treatment, adsorbed water/sewage treatment, etc. Effect

Inactive Publication Date: 2019-01-01
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the focus of research is mainly on the role of persistent free radicals in ordinary biochar or activated carbon, and there are few studies on persistent free radicals in sludge biochar with more complex components and poor properties.

Method used

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  • Application of municipal sludge in wastewater treatment
  • Application of municipal sludge in wastewater treatment

Examples

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Embodiment 1

[0018] A kind of embodiment of the application of urban sludge of the present invention in wastewater treatment, the application method of this embodiment is as follows:

[0019] The sludge after concentration and dehydration of Guangzhou Lijiao Sewage Treatment Plant was selected as the material. The sludge was naturally air-dried and placed in a tube furnace. Then adjust the heating rate to 10°C·min -1 , After rising to 400°C for 2 hours, let it cool naturally. The whole process of dry distillation is carried out in 0.5ml min -1 Nitrogen is passed through at a high speed as a protective gas for the anaerobic environment, the temperature of the carbonization treatment is 300-400° C., and the time of the carbonization treatment is 2-3 hours. The exudation toxicity and concentration of heavy metal ions (Pb, Cu, Zn, Cr and Cd) of the prepared sludge biochar were below the detection limit and could not be detected.

[0020] After carbonization, the sludge biochar was stored in...

Embodiment 2

[0025] In this example, 0.04 g of the fresh sludge charcoal prepared in Example 1 was added to 20 mL of p-nitrophenol solutions of different concentrations, and the mixture was slowly shaken in an air bath for 24 hours. Then place it in a centrifuge, centrifuge at a speed of 2000r / min for 5 minutes, take 10ml of the supernatant and pass it through a 0.45μm filter membrane, and analyze and detect the residual p-nitrophenol and nitrate ions in the solution. Then, after the sludge biochar after the reaction was filtered and dried at low temperature (50° C.), it was contacted with the p-nitrophenol solution under the same conditions for the first time for 24 hours, and then filtered and analyzed as shown before, and the results were as follows: Table 2 shows.

[0026] Table 2 The removal effect of p-nitrophenol by sludge biochar for the first and second use

[0027]

[0028] As shown in Table 2, it was found that the reuse of sludge biochar still had a certain removal effect o...

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Abstract

The invention discloses application of municipal sludge in wastewater treatment. An application method comprises the following steps: firstly dehydrating municipal sludge, and performing destructive distillation treatment for 2-3 hours at a temperature of 300-400 DEG C to obtain sludge bio-char; enabling the prepared sludge bio-chair to be in contact with wastewater containing p-nitrophenol, and enabling contact time to be greater than 6 hours; adsorbing and degrading p-nitrophenol in wastewater; and regulating the pH value of the wastewater to be smaller than 7.0 when the sludge bio-char is further in contact with wastewater containing p-nitrophenol, and enabling the optimal pH value to be 4.0. The application is beneficial for reduction treatment, harmless treatment and recycling treatment of sludge; the obtained sludge bio-char has relatively good removal effect can be utilized for a second time, and has relatively strong application potential.

Description

technical field [0001] The invention relates to the application field of municipal sludge in environmental protection, in particular to the application of municipal sludge in wastewater treatment. Background technique [0002] p-Nitrophenol is a refractory organic pollutant and has been listed as a priority prevention and control target by various countries. It mainly comes from fine chemical industries such as dyes, pesticides, and pharmaceuticals. Once it enters the environment, it can exist stably for a long time and accumulate in organisms. Long-term impact on human health and the ecological environment. Therefore, the research and development of a feasible treatment technology for refractory organic polluted wastewater has significant social and environmental benefits. [0003] At present, the treatment technologies of p-nitrophenol are mainly adsorption method and extraction method, but these two methods have their own shortcomings and cannot meet the current pollutio...

Claims

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Application Information

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IPC IPC(8): C02F1/28C10B53/00C02F101/38
CPCC02F1/285C02F2101/38C10B53/00
Inventor 章卫华肖佳娜姜驰翛贾彦明
Owner SUN YAT SEN UNIV
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