Green and efficient composite sludge dewatering process of natural polymeric flocculant and clay material

A natural polymer and sludge dehydration technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of not being able to significantly improve sludge dehydration, and achieve improved sludge dehydration effect , reduce dosage and reduce cost

Active Publication Date: 2022-05-13
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in general, a single physical conditioner cannot significantly improve sludge dewatering

Method used

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  • Green and efficient composite sludge dewatering process of natural polymeric flocculant and clay material
  • Green and efficient composite sludge dewatering process of natural polymeric flocculant and clay material
  • Green and efficient composite sludge dewatering process of natural polymeric flocculant and clay material

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Effect test

Embodiment 1

[0034]Attapulgite (commercially available) and laboratory-made 3-chloro-2-hydroxypropyltrimethylammonium chloride modified starch (CS) were used for sludge dewatering experiments. For the preparation method of CS, see: (Flocculation and antimicrobial properties of a cationized starch, Zhouzhou Liu, Mu Huang, Aimin Li, Hu Yang, Water Research, 2017, 119, 57-66.)

[0035] Taking the sludge of Nanjing Sewage Treatment Plant as the experimental object, firstly add different doses of CS, stir quickly for 1 minute, stir slowly for 1 minute, then add different doses of attapulgite, stir quickly for 30 seconds, stir slowly for 210 seconds, and let stand for 5 minutes Finally, use a vacuum pump to perform suction filtration for 6 minutes, and measure the moisture content of the sludge cake after conditioning, the specific resistance of the sludge, etc. figure 1 is the dewatering effect of the flocculant on the actual sludge. It can be seen from the figure that when the amount of flocc...

Embodiment 2

[0037] Using attapulgite (commercially available) and laboratory-made CS-DML (Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering, Pan Hu, Shaohang Shen, Hu Yang, Scientific Reports, 2021, 11, 11819(1-13) .) Conduct sludge dewatering experiments. Sludge from Nanjing Wastewater Treatment Plant was used as the treated water sample. The amount of attapulgite is 14kg / m 3 , starch grafted polyacrylic acid consumption is 2.0mg / L, and its dehydration effect is not as good as embodiment 1.

Embodiment 3

[0039] Attapulgite (commercially available) and laboratory-made CS-DMC (The influence of hydrophobicity onsludge dewatering associated with cationic starch-based flocculants, Pan Hu, Shaohang Shen, Donghua Zhao, Hua Wei, Jun Ge, Feiyue Jia, Xiangxiang Zhang, Hu Yang, Journal of Environmental Management, 2021, 296, 113218(1-10).). Sludge from Nanjing Wastewater Treatment Plant was used as the treated water sample. The amount of attapulgite is 6kg / m 3 , CMC-g-PDMC consumption is 0.2mg / L, and its dehydration effect is not as good as embodiment 1.

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Abstract

The invention discloses a process for dehydrating sludge by green and efficient compounding of a natural polymeric flocculant and a clay material, which belongs to the field of water treatment process application, and comprises the following steps: the adopted natural polymeric flocculant comprises commercially available and self-made cationic natural polymeric flocculant, the natural polymeric flocculant is firstly added, and then the clay material is added. While the mechanical sludge dewatering effect is achieved, the clay material is continuously added into the water body on the basis of adding the natural polymeric flocculant, so that the water content of the sludge, the specific resistance of the sludge, the capillary water absorption time and the like are effectively reduced, other potential organic pollutants are not introduced, the cleanness and safety of the water body are ensured, and the sludge dewatering effect is improved. Meanwhile, the addition of the clay material is beneficial to reducing the addition amount of the natural polymeric flocculant, so that the cost is reduced.

Description

technical field [0001] The invention belongs to the application field of water treatment technology, and in particular relates to a sludge dewatering technology by combining a natural polymer flocculant and a clay material. Background technique [0002] In recent years, with the steady improvement of my country's economic level, the public has gradually turned their attention to the field of environmental protection. With the increase in the number of sewage treatment plants and the improvement of the efficiency and scale of sewage treatment, the discharge of sludge as a by-product of sewage treatment has increased significantly, thereby increasing the amount of sludge that needs to be treated. In addition, the sludge produced by municipal sewage treatment plants is composed of water and suspended solids and contains a large amount of toxins. Therefore, sewage sludge, like any other waste, must be properly utilized in accordance with legal, environmental and social requireme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148
CPCC02F11/148
Inventor 杨琥沈少航胡潘
Owner NANJING UNIV
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