Bentonite coagulant and application thereof in wastewater treatment

A technology of wastewater treatment and bentonite, which is applied in the fields of animal husbandry wastewater treatment, flocculation/sedimentation water/sewage treatment, waste coating treatment, etc. It can solve the problems of small dispersion and loose flocs, unfavorable centralized disposal, easy diffusion, etc., and achieve floating performance. Good, low production cost, good stability

Pending Publication Date: 2021-06-29
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing coagulants form sedimentation slag with high water content, and the flocs produced are small and loosely dispersed, the amount of slag is large, easy to spread, sedimentation is slow, and it is not conducive to centralized disposal

Method used

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  • Bentonite coagulant and application thereof in wastewater treatment
  • Bentonite coagulant and application thereof in wastewater treatment
  • Bentonite coagulant and application thereof in wastewater treatment

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0052] This embodiment provides the application of bentonite coagulant in the purification of water-based paint wastewater, for water-based paint stock solution wastewater with COD greater than hundreds of thousands: the specific steps include:

[0053] 1) First take 0.4mL of water-based paint stock solution, add 200mL of deionized water to obtain a water-based paint aqueous solution; add 0.005g of polyaluminum chloride to the above-mentioned water-based paint aqueous solution, and stir at a speed of 700rpm for 2min;

[0054] 2) Continue to add 1g of bentonite and stir for 2min at a speed of 700rpm;

[0055] 3) Continue to add 1 ml of polyacrylamide aqueous solution with a mass fraction of 0.6%, stir at a speed of 700 rpm for 1 min, and then stir at a speed of 500 rpm for 1 min;

[0056] 4) Settling for 10 minutes to obtain a clear solution.

[0057] Add bentonite coagulant to treat water-based paint wastewater according to the above method, and measure its turbidity and COD....

Embodiment 2

[0064] This embodiment provides the application of accumulated bentonite coagulant in the purification of heavy metal wastewater. For wastewater containing chromium and nickel, the specific steps include:

[0065] 1) prepare respectively the Cr of 20mg / L 6+ and 50mg / L Ni 6+ For waste water, take 200mL waste water, add 0.005g polyaluminum chloride respectively, and stir at 700rpm for 2min;

[0066] Step S2, continue to add 0.2 g of bentonite respectively, and stir at a speed of 700 rpm for 2 min;

[0067] Step S3, continue to add 1 ml of polyacrylamide aqueous solution with a mass fraction of 0.6%, stir at 700 rpm for 30 min, and then at 500 rpm for 30 min;

[0068] Step S4, settling for 10 minutes to obtain two clear liquids.

[0069] Get the above two clear liquids, filter them with a 0.45 μm filter head through a syringe, and measure the concentrations of hexavalent chromium and nickel ions in the clear liquids by flame atomic absorption spectrophotometry to obtain the fo...

Embodiment 3

[0072] This embodiment provides the application of accumulated bentonite coagulant in the purification of waste water containing organic pollutants. Bisphenol A is selected as the target pollutant. The specific steps include:

[0073] 1) To prepare 5 mg / L bisphenol A contaminated wastewater, take 200 mL of bisphenol A contaminated wastewater; add 0.005 g of polyaluminum chloride to the above 200 mL of bisphenol A contaminated wastewater, and stir for 2 minutes;

[0074] 2) Continue to add 1.0g of bentonite and stir for 2 minutes;

[0075] 3) Continue to add 1 ml of polyacrylamide aqueous solution with a mass fraction of 0.6%, first stir at 700 rpm for 30 min, and then at 500 rpm for another 1 h;

[0076] Step S4, settling for 10 minutes to obtain a clear liquid.

[0077] Take the upper clear liquid and filter it through a syringe with a 0.45 μm filter head, scan the bisphenol A solution in the range of 100-800 nm with a UV spectrophotometer, and measure the maximum absorption...

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Abstract

The invention provides a bentonite coagulant and application thereof in wastewater treatment. The bentonite coagulant is prepared from the following components in parts by mass: 10 to 200 parts of bentonite, 4 to 6 parts of polyaluminum chloride and 0.4 to 0.6 part of polyacrylamide. The bentonite coagulant provided by the invention can be used for carrying out solid-liquid separation and liquid-liquid separation on wastewater and producing clear water within 5-10 minutes, is efficient and rapid, enables colloid formed by suspended matters after the wastewater is reacted to be compact, can thoroughly separate scum from water, and is small in scum amount, good in floating performance and beneficial to scum cleaning.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a coagulant, in particular to a bentonite coagulant and its application in wastewater treatment. Background technique [0002] Water resources are basic resources and an important part of the human living environment. However, human beings are now facing serious damage to water resources and the serious challenge of water pollution. The increasing water pollution has posed a major threat to human survival and safety, and has become a major obstacle to human health, economic and social sustainable development. [0003] In order to ensure the sustainable utilization of water resources and solve the problem of water environmental pollution, a variety of water treatment processes have been developed at home and abroad. Among them, the flocculation-sedimentation method plays an important role in the primary treatment of wastewater because of its advantages of simplicity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56C02F101/30C02F101/20C02F101/34C02F101/22C02F101/10C02F103/20
CPCC02F1/5236C02F1/56C02F2101/30C02F2101/20C02F2101/34C02F2101/22C02F2101/345C02F2101/308C02F2101/105C02F2103/14C02F2209/08C02F2103/20
Inventor 邱心泓张术旺陈金毅
Owner WUHAN INSTITUTE OF TECHNOLOGY
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