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Treatment method for methylene blue dye wastewater based on short-range photocatalysis/alga biodegradation

A methylene blue dye and biodegradation technology, which is applied in the field of methylene blue dye wastewater treatment, can solve the problems of long treatment process, complicated operation, high energy consumption, etc., and achieve the effect of high degree of environmental harmlessness, simple process, and low energy consumption

Inactive Publication Date: 2020-09-29
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the advantages of recyclable catalytic materials, wide application range, and significant degradation effect. However, the treatment process is long and requires pre-adsorption and coagulation steps. waste water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Treat methylene blue dye wastewater in the following ways:

[0023] 1) Add 2.5g of UiO-67 to 100mL of methylene blue dye wastewater with a concentration of 600mg / L, and conduct a short-range photocatalytic reaction at an oscillation rate of 200r / min under 200W visible light for 1.5h, the pH of the solution is 8, and the temperature is 30 ℃. Convert methylene blue to readily biodegradable intermediates.

[0024] 2) After the photocatalysis was completed, the treatment solution was left to stand for 25 minutes to allow the UiO-67 to settle naturally, to achieve solid-liquid separation, and to obtain the methylene blue wastewater in the upper layer after photocatalysis and UiO-67 in the lower layer.

[0025] 3) Add Chlorella pyrenoidosa with a wet weight of 10g to the photocatalytically degraded methylene blue wastewater on the upper layer, and continuously illuminate with 200W visible light for 12h a day at a constant temperature of 25°C, and react for 3 days.

Embodiment 2

[0027] Treat methylene blue dye wastewater in the following ways:

[0028] 1) Add 4g of UiO-67 to 100mL of methylene blue dye wastewater with a concentration of 800mg / L, and conduct a short-range photocatalytic reaction at an oscillation rate of 200r / min under 200W visible light for 1.5h, the pH of the solution is 9, and the temperature is 40°C . Convert methylene blue to readily biodegradable intermediates.

[0029] 2) After the photocatalysis is completed, the treatment solution is left to stand for 20 minutes to allow the UiO-67 to settle naturally to achieve solid-liquid separation, and the upper layer of methylene blue wastewater after photocatalysis and the lower layer of UiO-67 are obtained.

[0030] 3) Add Chlorella pyrenoidosa with a wet weight of 12g to the photocatalytically degraded methylene blue wastewater on the upper layer, and continuously illuminate with 200W visible light for 12h a day at a constant temperature of 25°C, and react for 3 days.

Embodiment 3

[0032] Treat methylene blue dye wastewater in the following ways:

[0033]1) Add 2g of UiO-67 to 100mL of methylene blue dye wastewater with a concentration of 600mg / L, and conduct a short-range photocatalytic reaction at an oscillation rate of 200r / min under 200W visible light for 2h, the pH of the solution is 8, and the temperature is 30°C. Convert methylene blue to readily biodegradable intermediates.

[0034] 2) After the photocatalysis is completed, the treatment solution is left to stand for 30 minutes to allow UiO-67 to settle naturally, to achieve solid-liquid separation, and to obtain the upper layer of methylene blue wastewater after photocatalysis and the lower layer of UiO-67.

[0035] 3) Add Chlorella pyrenoidosa with a wet weight of 10g to the photocatalytically degraded methylene blue wastewater on the upper layer, and continuously illuminate with 200W visible light for 12h a day at a constant temperature of 25°C, and react for 3 days.

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PUM

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Abstract

The invention discloses a treatment method for methylene blue dye wastewater based on short-range photocatalysis / alga biodegradation. The method specifically comprises the following steps: (1) short-range photocatalysis: adding a metal organic framework material UiO-67 into methylene blue dye wastewater with a concentration of 500-800 mg / L, and carrying out a short-range photocatalysis reaction under the irradiation of visible light so as to convert methylene blue into an intermediate product which is easy to biodegrade; (2) settling: after photocatalysis is completed, subjecting a treated solution to standing for a period of time so as to enable UiO-67 to naturally settle, thereby realizing separation of upper-layer liquid and lower-layer solid; and (3) alga degradation: further treatinga photodegradation intermediate product in the upper-layer liquid obtained in the step (2) with chlorella pyrenoidosa to completely degrade the photodegradation intermediate product. According to themethod, the removal rate of high-concentration methylene blue can reach 95% or above, used materials are easy to prepare, dye degradation efficiency is high, harmless effect is good, treatment cost islow, and the method has good application potential.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a methylene blue dye wastewater treatment method based on short-range photocatalysis / algae biodegradation. Background technique [0002] The textile printing and dyeing industry has a long history. It contributes to economic, social and cultural development, yet it is considered the second most polluting industry in the world. Worldwide, more than 10,000 tons of textile dyes are produced annually, of which about 100 tons are discharged into wastewater. Textile printing and dyeing wastewater is characterized by large pH changes, high chemical oxygen demand, high total organic carbon content, and contains toxic and carcinogenic pollutants. Although all countries have strict standards for the discharge of printing and dyeing wastewater, a small amount of non-biodegradable pollutants can easily escape from treatment plants and accumulate in nature, which se...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30C02F103/30
CPCC02F9/00C02F1/30C02F1/725C02F2001/007C02F3/322C02F2101/308C02F2103/30C02F2305/10
Inventor 黄廷唐晓旻
Owner CHONGQING TECH & BUSINESS UNIV
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