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A method for improving sludge dewatering effect by using sodium perfluorooctanoate wastewater

A technology for sodium perfluorooctanoate and sludge dehydration, applied in water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, sludge treatment, etc., to prevent excessive sludge viscosity, facilitate eradication, and improve freeze-drying The effect of disk structure

Active Publication Date: 2022-05-31
广东沁华智能环境技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is to improve the dehydration effect of sludge by using sodium perfluorooctanoate (NAPFO) surfactant in the sewage, determine the dosage of sodium perfluorooctanoate, prevent the sludge from being too viscous, and improve the freeze-drying plate structure of the freeze dryer , to facilitate the removal of sludge

Method used

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  • A method for improving sludge dewatering effect by using sodium perfluorooctanoate wastewater
  • A method for improving sludge dewatering effect by using sodium perfluorooctanoate wastewater
  • A method for improving sludge dewatering effect by using sodium perfluorooctanoate wastewater

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Embodiment 1

[0028] A method of utilizing sodium perfluorooctanoate wastewater to improve sludge dewatering effect, characterized in that the steps are as follows:

[0029] (1) Sludge drying, fresh sludge drying at 95℃ for 48h.

[0030] (2) Treatment of sodium perfluorooctanoate wastewater, take the wastewater containing sodium perfluorooctanoate and filter to remove impurities to clarify the wastewater, then add NaOH to adjust the pH of the wastewater at 6, and then adopt the osmosis method to obtain a mother liquor containing sodium perfluorooctanoate with a concentration of 5g / L.

[0031] (3) mixing, stirring and dehydration, the sludge dried in step (1) and the mother liquor containing sodium perfluorooctanoate obtained in step (2) are first stirred at high speed and then fully mixed at low speed in the ratio of adding 56 mL of mother liquor per liter of sludge, and then The supernatant was removed by standing and settling; the high-speed stirring time was 30s, and the speed was 160r / m...

Embodiment 2

[0034] A method of utilizing sodium perfluorooctanoate wastewater to improve sludge dewatering effect, characterized in that the steps are as follows:

[0035] (1) Drying of sludge, drying of fresh sludge at 100°C for 60h.

[0036] (2) Treatment of sodium perfluorooctanoate wastewater, take the wastewater containing sodium perfluorooctanoate and filter to remove impurities to clarify the wastewater, then add NaOH to adjust the pH of the wastewater at 8, and then adopt the osmosis method to obtain a mother liquor containing sodium perfluorooctanoate with a concentration of 5g / L.

[0037] (3) mixing, stirring and dehydration, the sludge dried in step (1) and the mother liquor containing sodium perfluorooctanoate obtained in step (2) are mixed with high-speed stirring and then low-speed stirring at the ratio of adding 112 mL of mother liquor per liter of sludge, and then The supernatant was removed by standing and settling; the high-speed stirring time was 40s, and the speed was ...

Embodiment 3

[0040] A method of utilizing sodium perfluorooctanoate wastewater to improve sludge dewatering effect, characterized in that the steps are as follows:

[0041] (1) Drying of sludge, drying of fresh sludge at 105°C for 72h.

[0042] (2) The treatment of sodium perfluorooctanoate wastewater, take the wastewater containing sodium perfluorooctanoate and filter to remove impurities to clarify the wastewater, then add NaOH to adjust the pH of the wastewater to be 11, and then adopt the osmosis method to obtain a mother liquor containing sodium perfluorooctanoate with a concentration of 5g / L.

[0043] (3) Mixing and stirring dehydration, the sludge dried in step (1) and the mother liquor containing sodium perfluorooctanoate obtained in step (2) are first stirred at high speed and then fully mixed at low speed in the ratio of adding 224 mL of mother liquor per liter of sludge, and then The supernatant was removed by standing and settling; the high-speed stirring time was 50s, and the ...

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Abstract

The invention provides a method for improving the dehydration effect of sludge by using sodium perfluorooctanoate wastewater. The steps are as follows: (1) sludge drying; (2) treatment of sodium perfluorooctanoate wastewater; (3) mixing and stirring for dehydration; (4) freeze-drying and dehydration . The present invention utilizes perfluorooctanoic acid sodium surfactant to improve the effect of sludge dehydration, determines the dosage of perfluorooctanoic acid sodium, prevents sludge from being too viscous, and improves the structure of a freeze-drying plate of a freeze dryer to facilitate removal of sludge.

Description

technical field [0001] The invention relates to sludge dewatering, in particular to a method for improving sludge dewatering effect by utilizing sodium perfluorooctanoate wastewater. Background technique [0002] Generally, the high organic matter components contained in the sludge and its own hydrophilicity can make the dehydrated sludge still have a high water content. It is difficult for the traditional treatment methods to achieve resource utilization, harmlessness and reduction of sludge volume. The purpose of this study is that the enhanced pretreatment of sludge can promote the hydrolysis of the flocculent structure of extracellular polymer (EPS), which is also beneficial to the next treatment of sludge in the subsequent process. [0003] Surfactants can weaken the binding between sludge flocs, promote the dissolution rate of extracellular polymer (EPS), and promote the release of bound water. Usually, in sludge conditioning, CTAB, polyaluminum chloride, PAM, etc. ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/147C02F11/12C02F11/20
CPCC02F11/147C02F11/12C02F11/20Y02W10/37
Inventor 王振宇唐世刚兰巧巧吴妍
Owner 广东沁华智能环境技术股份有限公司
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