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
View PDF8 Cites 1 Cited by
  • 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 degradat

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1:

[0022] The methylene blue dye wastewater is treated in the following ways:

[0023] 1) 2.5g UiO-67 was added to 100mL of methylene blue dye wastewater with a concentration of 600mg / L, and the short-range photocatalytic reaction was carried out at an oscillation rate of 200r / min under 200W visible light for 1.5h. The pH of the solution was 8 and the temperature was 30 °C. Converts methylene blue to a readily biodegradable intermediate.

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

[0025] 3) Add 10g of humidified Chlorella pyrenoidosa to the methylene blue wastewater that has been photocatalytically degraded in the upper layer, and continuously illuminate with 200W visible light for 12 hours a day at a consta...

Example Embodiment

[0026] Example 2:

[0027] The methylene blue dye wastewater is treated in the following ways:

[0028] 1) 4g UiO-67 was added to 100mL of methylene blue dye wastewater with a concentration of 800mg / L, and the short-range photocatalytic reaction was carried out at an oscillation rate of 200r / min under 200W visible light for 1.5h. The pH value of the solution was 9 and the temperature was 40℃ . Converts methylene blue to a readily biodegradable intermediate.

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

[0030] 3) Add 12g of humidified Chlorella pyrenoidosa to the methylene blue wastewater that has been photocatalytically degraded in the upper layer, and continuously illuminate with 200W visible light for 12 hours a day at a con...

Example Embodiment

[0031] Example 3:

[0032] The methylene blue dye wastewater is treated in the following ways:

[0033]1) 2g UiO-67 was added to 100mL of methylene blue dye wastewater with a concentration of 600mg / L, and the short-range photocatalytic reaction was carried out at an oscillation rate of 200r / min under 200W visible light illumination for 2h. The pH value of the solution was 8 and the temperature was 30℃. Converts methylene blue to a readily biodegradable intermediate.

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

[0035] 3) Add 10g of humidified Chlorella pyrenoidosa to the methylene blue wastewater that has been photocatalytically degraded in the upper layer, and continuously illuminate with 200W visible light for 12 hours a day ...

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 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

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