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Method for conditioning sludge through amphoteric polymeric flocculant and biological nano zero-valent iron

An amphoteric polymer and bio-nano technology, which is used in the field of amphoteric polymer flocculants combined with bio-nano zero-valent iron to adjust sludge, can solve the problems of restricting the utilization of sludge resources, secondary environmental pollution, etc. The effect of wide range, low moisture content and simple preparation process

Active Publication Date: 2018-09-21
山西正和热电工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If not handled properly, it will cause secondary pollution to the environment
In particular, heavy metal pollution seriously restricts the subsequent resource utilization of sludge

Method used

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  • Method for conditioning sludge through amphoteric polymeric flocculant and biological nano zero-valent iron
  • Method for conditioning sludge through amphoteric polymeric flocculant and biological nano zero-valent iron
  • Method for conditioning sludge through amphoteric polymeric flocculant and biological nano zero-valent iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of bio-nano zero-valent iron suspension: To the dried and crushed grape skin pomace (mixture of grape skin and grape seeds), add 50% ethanol solution Extraction agent: 1 g of grape skin pomace powder is added to extract under the protection of nitrogen, heat and extract in a water bath at 80 °C for 40 min to obtain grape polyphenol extract, and the supernatant obtained by centrifugation at 8000 r / min is the grape polyphenol extract; 2 During the protection, under stirring at 60 r / min, the grape polyphenol extract was added dropwise and mixed in an equal volume of 0.1 M ferrous sulfate solution, and reacted at room temperature for 10 s to obtain a black fresh biological nano iron suspension.

[0027] The preparation method of PADS is as follows: take AM, DAC and SMAS whose mass ratio is 78 / 12 / 10, prepare an aqueous solution with a mass fraction of 10% with distilled water, and pour it into a three-necked flask equipped with a condensation and stirring device; ...

Embodiment 2

[0031] Preparation of bio-nano zero-valent iron suspension: To the dried and crushed grape skin pomace (mixture of grape skin and grape seeds), add 50% ethanol solution Extraction agent: 1 g of grape skin pomace powder is added to extract under the protection of nitrogen, heat and extract in a water bath at 80 °C for 40 min to obtain grape polyphenol extract, and the supernatant obtained by centrifugation at 8000 r / min is the grape polyphenol extract; 2 During the protection, under stirring at 60 r / min, the grape polyphenol extract was added dropwise and mixed in an equal volume of 0.1 M ferrous sulfate solution, and reacted at room temperature for 10 s to obtain a black fresh biological nano iron suspension.

[0032] The preparation method of PADS is: weigh AM, DAC, SMAS with a mass ratio of 80 / 10 / 10, make an aqueous solution with a mass fraction of 10% with distilled water, and pour it into a three-necked flask equipped with a condensation and stirring device; Adjust the pH va...

Embodiment 3

[0037] Preparation of biological nanometer zero-valent iron suspension: Add 50% ethanol solution to the dried and pulverized grape pomace (mixture of grape skin and grape seed) powder Extractant: add 1g of grape pomace powder to extract 20 mL; under the protection of nitrogen, heat and extract in a water bath at 80°C for 40 minutes to obtain grape polyphenol extract, and the supernatant obtained by centrifugation at 8000r / min is the grape polyphenol extract; 2 During protection, under stirring at 60r / min, add the grape polyphenol extract dropwise and mix with a medium volume of 0.1M ferrous sulfate solution, and react at room temperature for 10s to obtain a black fresh bio-nano-iron suspension.

[0038] The preparation method of PADS is: weigh AM, DAC, SMAS with a mass ratio of 90 / 5 / 5, make an aqueous solution with a mass fraction of 10% with distilled water, and pour it into a three-necked flask equipped with a condensation and stirring device; Adjust the pH value of the aque...

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Abstract

The invention discloses a method for conditioning sludge through an amphoteric polymeric flocculant and biological nano zero-valent iron. The method comprises the following steps that 1, the biological nano zero-valent iron is used for conditoning the sludge, wherein a fresh biological nano zero-valent iron suspension is put into the sludge and stirred, so that heavy metal in the sludge is stablized; 2, the amphoteric polymeric flocculant P(AM-DAC-SMAS which is called as PADS for short) is used for conditioning the sludge, wherein the PADS is put in the conditioned sludge and stirred, and sludge flocculating and dewatering are achieved through a good flocculating function of PADS; 3, the sludge mixture obtained after flocculating is subjected to centrifugal dewatering. The combined use ofthe amphoteric polymeric flocculant and the biological nano zero-valent iron can reduce the migration and transformation capacity of the heavy metal, and the biological nano zero-valent iron can alsoachieve functions of a flocculating auxiliary. The method has the advantages of being low in PADS consumption, high in dewatering efficiency and wide in pH value application range; a foundation is laid for subsequent resource utilization of the sludge.

Description

technical field [0001] The invention relates to a method for conditioning sludge with amphoteric polymer flocculants combined with biological nano-zero valent iron, and belongs to the technical field of sewage treatment. Background technique [0002] The treatment and disposal of sludge has become a hotspot of people's attention and research. The sludge of urban sewage treatment plants generally has a moisture content of more than 98wt%, is bulky and contains toxic and harmful substances such as pathogenic microorganisms, parasite eggs and heavy metals. Improper disposal will cause secondary pollution to the environment. In particular, the pollution of heavy metals seriously restricts the subsequent resource utilization of sludge. [0003] Sludge dewatering is the core link of sludge treatment and disposal. The use of polymer flocculants for sludge dewatering can effectively remove water. At present, there are two main ideas for the removal of heavy metal pollution: one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/00C02F101/20
CPCC02F11/008C02F11/14C02F2101/20C02F2303/06
Inventor 郭波岳秀萍田瑜李赛李美玲
Owner 山西正和热电工程有限公司
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