Preparation method and application of composite flocculant

A composite flocculant and reaction technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of narrow effective concentration range, seldom used alone, and less sludge generated, and achieves wide application range, adsorption bridging High capacity and low processing cost

Inactive Publication Date: 2012-07-04
CHANGZHOU UNIV
View PDF5 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The flocculation mechanism of polysilicate metal salt is mainly due to the strong adsorption and bridging ability of polysilicate to colloidal particles in water, and its strong adaptability to wastewater containing various complex components, but its dosage is large. rarely used alone
Chitosan (CTS) is a product o

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method and application of composite flocculant
  • Preparation method and application of composite flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Effect of Mass Ratio on Flocculation Effect of Composite Flocculants

[0022] Chitosan was dissolved in 1% acetic acid aqueous solution to form a stock solution with a concentration of 3 g / L, and polysilicate aluminum chloride ferric chloride solution was added under magnetic stirrer stirring, and the mass ratio of PSAFC and CTS was respectively set as 1:2, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, add 10% dilute hydrochloric acid dropwise to adjust the pH value to 2, stir vigorously to make it evenly mixed. Slowly heated to 70 °C, reacted at a constant temperature for 30 min, and cooled naturally to room temperature to prepare a composite flocculant, which was subjected to flocculation experiments of cyanobacterial biogas slurry.

[0023]Take 250 mL of cyanobacteria wastewater, the turbidity is 112 NTU, the TP is 87 mg / L, the dosage of PSAFC-CTS composite flocculant is 2.5 mL, and the electric stirrer is used to stir rapidly (300 r / min) and then slowly ( 100 r / min) stirring, afte...

Embodiment 2

[0025] Effect of pH value on flocculation effect of composite flocculant

[0026] Get chitosan and be dissolved in volume fraction and be that 1% acetic acid aqueous solution is made into the stock solution that concentration is 3 g / L, under the situation that guarantees raw material proportioning is 5:1, add polysilicate aluminum chloride under magnetic stirrer stirring Iron solution, the mass concentration is 10% dilute hydrochloric acid or the mass concentration is 10% sodium hydroxide to adjust the pH value, and the pH value conditions are set to 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8 respectively , 10. Slowly heated to 70 °C, reacted at constant temperature for 30 min, and cooled naturally to room temperature. After preparing the composite flocculant, the cyanobacterial biogas slurry flocculation experiments were carried out respectively.

[0027] Take 250 mL of cyanobacteria wastewater, the turbidity is 125 NTU, the TP is 91 mg / L, the dosage of PSAFC-CTS composite flocculant ...

Embodiment 3

[0029] Effect of Reaction Temperature on Flocculation Effect of Composite Flocculants

[0030] Get chitosan and be dissolved in volume fraction and be that 1% acetic acid aqueous solution is made into the stock solution that concentration is 3 g / L, under the situation that guarantees raw material proportioning is 5:1, add polysilicate aluminum chloride under magnetic stirrer stirring Iron solution, add 10% dilute hydrochloric acid dropwise to adjust pH=2.5, stir vigorously to make it evenly mixed. Set up to heat slowly to 40 °C, 50 °C, 60 °C, 70 °C, and 80 °C respectively, and the reaction time is 30 min, then cool naturally to room temperature, and carry out flocculation experiments on the prepared composite flocculants respectively.

[0031] Take 250 mL of cyanobacteria wastewater, the turbidity is 103 NTU, the TP is 110 mg / L, the dosage of PSAFC-CTS composite flocculant is 2.5 mL, and the electric stirrer is used to stir rapidly (300 r / min) and then slowly ( 100 r / min) sti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a preparation method and application of a composite flocculant, which belong to the technical field of wastewater treatment. The preparation method comprises dissolving chitosan into acetic acid water solution with volume fraction of 1% to prepare stock solution with concentration of 3g/L, adding a certain amount of polysilicate ferric aluminum chloride (PSAFC) solution with magnetic mixing, dropwisely adding 10% of diluted hydrochloric acid or 10% of sodium hydroxide to regulate the pH value, evenly stirring to enable the mixture to mix evenly, slowly heating the mixture to a reaction temperature for reaction for a certain time, naturally cooling to a room temperature, standing and curing for 24 hours at the room temperature, and then obtaining the uniform and stable PSAFC-CTS composite flocculant. The prepared composite flocculant has an effect of rapid flocculating sedimentation when applied to flocculation pretreatment on blue-green algae biogas slurry. In addition, the prepared composite flocculant has the advantages of being simple in preparation process, high in turbidity and phosphorous removal efficiency, strong in adsorption bridging capacity on colloidal substance, wide in application range, low in treatment cost and the like.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a preparation method and application of a composite flocculant, which is suitable for pretreatment of wastewater with high turbidity and high total phosphorus concentration. Background technique [0002] At present, inorganic / organic composite flocculants have become a hot spot in the research and development of water treatment technology on the basis of traditional flocculants such as aluminum salts and iron salts and single agents. For example, Chinese patent CN1594128 discloses an inorganic / organic composite flocculant and its preparation process, which is prepared by introducing PDMDAAC (polydimethyldiallyl ammonium chloride) into PAC (polyaluminum chloride) solution. become. The flocculant has the advantages of strong adsorption and bridging ability for colloidal substances, and less sludge generated. Chinese patent CN1724404 reports a polymeric ir...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F1/52C02F1/56
Inventor 张文艺邱小兰范培成吴凌云李定龙
Owner CHANGZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap