A water-retaining agent prepared from excess sludge and its preparation method and use method

A technology of excess sludge and water-retaining agent, which is applied in field preparation methods, chemical instruments and methods, applications, etc., can solve the problems of high cost, time-consuming and difficult control of biological methods, avoid insufficient degradation, reduce use risks, The effect of improving the environmental protection effect

Active Publication Date: 2021-10-08
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above research methods have strong guiding significance for the effective treatment of excess sludge, but there are more or less different shortcomings in these research methods: the addition of chemical agents in chemical methods increases the toxicity of sludge, and will also affect The environment produces certain hazards; physical methods may be slow in operation or have high costs; biological methods may be costly, time-consuming, or difficult to control and other defects

Method used

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  • A water-retaining agent prepared from excess sludge and its preparation method and use method
  • A water-retaining agent prepared from excess sludge and its preparation method and use method
  • A water-retaining agent prepared from excess sludge and its preparation method and use method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Material preparation:

[0056] The remaining sludge was taken from the urban sewage treatment plant, and it was confirmed that there was no heavy metal pollution; the magnetic magnesium aluminum hydrotalcite was synthesized by coprecipitation method; the analytically pure HCl was purchased from the chemical reagent factory.

[0057] (2) Preparation of water retaining agent:

[0058] First, measure 100mL of excess sludge without heavy metal pollution and 0.5g of magnetic magnesium-aluminum hydrotalcite into a 200mL volumetric flask, stir thoroughly for 1.5h, and then apply ultrasonic waves for 3min with an ultrasonic power of 360W. After the ultrasound is completed, use electron beam irradiation technology for 1min, and the irradiation meter is 35kGy, then take out the volumetric flask, cool to room temperature, and centrifuge to obtain supernatant A and solid B;

[0059] Then, the obtained solid B is subjected to magnetic separation to obtain magnetic magnesium alu...

Embodiment 2

[0067] (1) Material preparation:

[0068] The preparation of excess sludge, magnetic magnesium aluminum hydrotalcite, and HCl is the same as in Example 1.

[0069] (2) Preparation of water retaining agent:

[0070] First, measure 100 mL of excess sludge without heavy metal pollution and 0.8 g of magnetic magnesium-aluminum hydrotalcite into a 200 mL volumetric flask, stir thoroughly for 1.8 h, and then apply ultrasonic waves for 5 min with a power of 360 W. After the ultrasound is completed, use electron beam irradiation technology for 2 minutes, and the irradiation meter is 38kGy, then take out the volumetric flask, cool to room temperature, and centrifuge to obtain supernatant A and solid B;

[0071] Then, the obtained solid B is subjected to magnetic separation to obtain magnetic magnesium aluminum hydrotalcite. Fully mix the magnetic hydrotalcite and liquid A in the flask, and then irradiate with electron beam for 11 minutes, and the irradiation meter is 0.8kGy. Then th...

Embodiment 3

[0079] (1) Material preparation:

[0080] The preparation of excess sludge, magnetic magnesium aluminum hydrotalcite, and HCl is the same as in Example 1.

[0081](2) Preparation of water retaining agent:

[0082] First, measure 100 mL of excess sludge without heavy metal pollution and 1.0 g of magnetic magnesium-aluminum hydrotalcite into a 200 mL volumetric flask, stir thoroughly for 2 hours, and then apply ultrasonic waves for 7 minutes with a power of 360 W. After the ultrasonic wave is completed, it is treated with electron beam irradiation technology for 3 minutes, and the irradiation meter is 40kGy, then the volumetric flask is taken out, cooled to room temperature, and centrifuged to obtain supernatant A and solid B;

[0083] Then, the obtained solid B is subjected to magnetic separation to obtain magnetic magnesium aluminum hydrotalcite. Fully mix the magnetic hydrotalcite and liquid A in the flask, and then irradiate with electron beam for 12 minutes, and the irrad...

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Abstract

The invention discloses a water-retaining agent prepared from excess sludge, a preparation method and a use method thereof, and belongs to the technical field of excess sludge treatment. The present invention can degrade organic substances such as proteins and polysaccharides contained in excess sludge by using magnetic magnesium aluminum hydrotalcite, ultrasonic action and electron beam irradiation treatment technology, and degrade the degraded polysaccharide molecules through freezing, drying, heat treatment and dissolution processes Form amphiphilic complexes with the degraded protein molecules through hydrogen bonding, hydrophobicity and electrostatic interactions; and then through self-assembly reactions, the amphiphilic complexes react in the water phase to obtain stable nanogels. Gels can be used as water retaining agents. The invention not only realizes the resource treatment of excess sludge, but also can improve the water-poor condition of sandy soil and restore the ecological environment. The long-term use of the prepared water-retaining agent will not cause heavy metal and Soil compaction or deterioration of physical and chemical properties can be safely applied.

Description

technical field [0001] The invention relates to the technical field of excess sludge treatment, in particular to a water-retaining agent prepared from excess sludge, a preparation method and a use method thereof. Background technique [0002] In recent years, the number of sewage treatment plants in my country has increased significantly. By the end of 2018, there were 4,332 sewage treatment plants in operation in cities and towns across the country, with a sewage treatment capacity of 195 million m 3 / d, a large amount of excess sludge is produced. These sludges are enriched with the toxic essence of sewage, and the pollution is very serious. However, compared with the rapid development of urban sewage treatment technology, the effective treatment and disposal of sludge is obviously lagging behind. A large amount of excess sludge has not been effectively and safely disposed of, and a large number of pollutants in sewage have returned to the environment, resulting in There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40A01B79/02A01B79/00C09K101/00
CPCA01B79/00A01B79/02C09K17/40C09K2101/00
Inventor 相玉琳相玉秀王德权刘叶海戴春雨
Owner YULIN UNIV
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