Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for efficiently removing chemical oxygen demand of pulping wastewater

A chemical oxygen demand, pulping wastewater technology, applied in chemical instruments and methods, processing wastewater treatment, water pollutants and other directions, can solve no help; Liu Xiyang et al (patent application number, Fenton dosage cannot be effectively reduced , unfavorable business operation control and other problems, to achieve the effect of improving complicated steps, saving equipment investment and low cost

Active Publication Date: 2018-12-11
广东鼎丰纸业有限公司
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the design of Fenton reactor for treating pulping wastewater, fluidized bed system is often used. After vigorous stirring, Fenton agent and wastewater are fully mixed to improve the oxidation efficiency of Fenton reaction, but the power consumption is relatively large.
[0005] In order to improve the oxidation efficiency of Fenton, an auxiliary unit can be added before or after the Fenton fluidized bed. For example, Tian Binghui et al. (patent application number: 201101021014.X) invented "a catalytic oxidation-composite flocculation integrated wastewater treatment process" , add a catalytic oxygen tank before the Fenton oxidation reaction tank to improve the oxidation efficiency of the Fenton reaction, and achieve better results for the treatment of chemical industry wastewater, but it is necessary to add another catalytic oxidation reaction tank; Wu Xiaoyi et al. (patent application No.: 201610789935.1) A method to improve the COD degradation efficiency and biochemical performance of wastewater. The wastewater undergoes steps such as Fenton oxidation, ozone oxidation, and electrocatalytic oxidation to obtain a better COD removal rate for ultra-high concentration wastewater, but the treatment After the wastewater COD is still very high; Wang Xiaojun et al. (patent application number: 200710027102.2) invented the "Fenton and air flotation integrated water treatment method", adding an air flotation device after the Fenton oxidation reaction tank to replace the general flocculation sedimentation tank , can improve the flocculation efficiency after the Fenton reaction, but it is not helpful to improve the Fenton reaction efficiency and reduce the dosage of drugs; Liu Xiyang et al. (patent application number: 201510954688.1) invented "A method for treating dye production wastewater by using magnesium oxide coagulation combined with Fenton oxidation" , Before the Fenton oxidation reaction, flocculate with magnesium oxide at pH 12, and then perform Fenton reaction on the treated wastewater, which has a certain effect on dye production wastewater
[0006] Such methods have a certain effect on wastewater treatment, but they are more or less complex in process and cumbersome in operation, and require multiple sets of independent equipment to operate in series, which consumes a lot of energy and occupies a large space, which is not conducive to the operation control and operation of enterprises. Fenton dosage can not be effectively reduced and other problems

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

Embodiment 1

[0030] Take 1000ml of biochemical wastewater treated with microbial aerobic aeration and COD of 278ppm, and divide it into 2 groups for testing: Group A: add flocculant [polyferric sulfate (11% of total iron, 10% of basicity)] 0.6ml, 0.1 % Cationic polyacrylamide 2ml, the system was stirred and reacted for 2min under the condition of pH 5, then added Fenton's reagent (6.5% Fe 2+ 1.16ml of ferrous sulfate, 0.20ml of 27.5% hydrogen peroxide) stirring for 1min, standing for 15min, then adding liquid caustic soda to the standing wastewater to adjust the pH to 6-9, adding anionic polyacrylamide and flocculating and settling, then discharging, the treated wastewater The COD is 42ppm, the COD removal rate is 84.9%, and it meets the national GB3544-2008 "Water Pollutant Discharge Standard for Pulp and Paper Industry" about the emission limit requirements of 100ppm for pulping enterprises and 80ppm for papermaking enterprises; Group B: no flocculant, Directly add an equal amount of Fen...

Embodiment 2

[0032] Take 1000ml of biochemical wastewater treated with microbial aerobic aeration and COD of 290ppm, and divide it into 2 groups for testing: Add flocculant [polyferric sulfate (full iron 11%, basicity 10%) 0.6ml, 0.1% cationic poly Acrylamide 2ml], the system was stirred and reacted for 5min under the condition that the pH was 5, and then Fenton’s reagent (6.5% Fe 2+ 1.16ml of ferrous sulfate, 0.20ml of 27.5% hydrogen peroxide) stirring for 5min, standing for 15min, then adding slaked lime to the standing wastewater to adjust the pH to 6-9, adding anionic polyacrylamide and flocculating and settling, then discharging, the treated wastewater COD The COD removal rate is 42ppm, and the COD removal rate is 87.9%, and it meets the national GB3544-2008 "Pulp and Paper Industry Water Pollutant Discharge Standard" about the discharge limit requirements of 100ppm for pulping enterprises and 80ppm for papermaking enterprises; Group B: no flocculant, directly Add Fenton's reagent (6....

Embodiment 3

[0034] Take 1000ml biochemical wastewater treated with microbial aerobic aeration, COD is 189ppm, add flocculant [polyferric sulfate (full iron 11%, basicity 10%) 0.4ml, 0.1% cationic polyacrylamide 2ml], the system is in The reaction was stirred for 5 min under the condition of pH 6, and then Fenton's reagent (6.5% Fe 2+1.16ml of ferrous sulfate, 0.05ml of 27.5% hydrogen peroxide) stirring for 1min, standing for 20min, then adding slaked lime to adjust the pH to 6-9 in the waste water left standing after treatment, adding anionic polyacrylamide and discharging after flocculation and sedimentation, after treatment The wastewater COD is 71ppm, and the COD removal rate is 62.4%, which meets the national GB3544-2008 "Water Pollutant Discharge Standard for Pulp and Paper Industry". ml, stirred at a speed of 150r / min for 2min at a pH of 4, and left to stand for 30min. After treatment, the effluent COD was 28ppm, and the COD removal rate was 85.2%.

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

PropertyMeasurementUnit
clearance rateaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for efficiently removing chemical oxygen demand of pulping wastewater, comprising the following steps: (1) sequentially adding an acidic inorganic polymer flocculant and an organic polymer flocculant to the wastewater, controlling the pH of a reaction system between 5 to 7 during the adding process, and stirring fully for a short time to complete flocculation; (2) adding Fenton agent to the flocculated wastewater in the same container, controlling the pH of the reaction system between 3 to 5 during the adding process, stirring fully for a short time, mixing themedicinal liquid evenly, and standing for reaction; and (3) adjusting the pH of the reacted wastewater, adding a small amount of high-molecular flocculant for turbidity separation and discharging. According to the invention, a flocculation method and the Fenton oxidation method are used in the same container for improving the complexity of the existing Fenton flocculation auxiliary unit and the Fenton oxidation process combination, saving equipment investment, improving reaction efficiency, and effectively removing organic matter content and chemical oxygen demand in wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for efficiently removing chemical oxygen demand in pulping wastewater. Background technique [0002] Pulping wastewater is one of the main sources of water pollution due to its complex composition, high pollutant load, and high content of water-soluble lignin that is difficult to decompose. At present, the more common wastewater treatment process generally adopts the first-level physical precipitation, the second-level biochemical treatment, and the third-level Fenton advanced oxidation process. [0003] The essence of the Fenton oxidation reaction is a chain reaction in which hydrogen peroxide is catalyzed by ferrous ions to decompose and produce hydroxyl radicals with high oxidation activity. The hydroxyl radical has a strong oxidation ability and its oxidation potential is as high as 2.80V, which is especially suitable for Wastewater with high COD and di...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/28C02F101/30
CPCC02F1/5245C02F1/56C02F1/722C02F2101/30C02F2103/28C02F2209/06C02F2209/08C02F2305/026
Inventor 王在梅秦昀昌
Owner 广东鼎丰纸业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products