Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for treating coking biochemical effluent by microwave-oxidation-coagulation technology

A technology for biochemical effluent and technical treatment, applied in the direction of oxidation water/sewage treatment, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., can solve COD, total cyanide chromaticity difficult to meet discharge and reuse standards, The external drainage cannot meet the requirements of production reuse, and the internal circulation of coking production water has not been realized, so as to achieve the effects of reducing project land and investment costs, improving sewage treatment efficiency, reducing production and operation costs and operating labor load

Active Publication Date: 2010-07-07
云南天朗环境科技有限公司
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the sewage produced in my country's coking production process contains high concentrations of pollutants such as phenol, cyanide, ammonia nitrogen, and COD. After being treated with the existing biochemical system, it is still difficult to meet the discharge and reuse standards for COD, total cyanide, and chroma. Achieving standard treatment and reuse of coking sewage has become one of the difficult problems in sewage treatment
For example, a company in Yunnan uses a nitrification-denitrification process system to treat sewage generated in the coking production process. The design treatment capacity of the system is 50m 3 / h, the actual processing capacity is 105m 3 / h, plus the dilution water and defoaming water in the system, the total water output is 200m 3 / h, daily average sewage discharge 4800m 3 / d, the system is in good condition. Although the content of phenol, cyanide, ammonia nitrogen and other pollutants in the treated external drainage is lower than the national discharge standard, the average concentration of COD in the external drainage of the system is close to the national standard critical value, sometimes exceeding the standard phenomenon, it needs to be diluted to meet the standard before it can be discharged, and the effluent color is relatively high. Therefore, the external discharge of the nitrification-denitrification sewage treatment system in the prior art cannot meet the requirements of production reuse
At the same time, the daily discharge is 4800m 3 biochemical effluent of 1,752,000m per year 3 The biochemical effluent has not realized the internal circulation of coking production water. On the one hand, it causes a great waste of water resources, and on the other hand, the environmental water body still needs to bear a considerable degree of pollution.

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] The method for microwave treatment of coking biochemical effluent provided by the present invention undergoes the following process steps:

[0031] A. Add H to the coking biochemical effluent to be treated 2 o 2 Mix reagent with ferrous chloride to the mass concentration of hydrogen peroxide in water is 0.01%, stir and mix, make the mixed solution pH value be 6.0, wherein, H 2 o 2 The mixing ratio with ferrous chloride is H 2 o 2 : Fe 2+ = molar ratio of 10:1;

[0032] B. Send the mixed solution in step A into an industrial microwave oven with a power of 40kW and a working temperature of 5-30°C, and let it act in the microwave field for 5s;

[0033] C. Adjust the pH value to 8.5 with milk of lime for the mixed liquor treated by microwave in step B, and adjust the pH value to 8.5 when the aeration rate is 10m 3 Under the aeration condition of / h, oxidation treatment (that is, aeration) for 4 hours, the upper liquid and the lower sludge are separated by sedimentati...

Embodiment 2

[0039] The present invention is accomplished through the following technical solutions: a method for treating coking biochemical effluent by microwave-oxidation-coagulation technology, which is characterized in that it undergoes the following process steps:

[0040] A. Add H to the coking biochemical effluent to be treated 2 o 2 with FeC 2 o 4 The mixed reagent of (ferrous oxalate) is 1% to the mass concentration of hydrogen peroxide in water, stirs and mixes, and makes mixed solution pH value be 2.0, wherein, H 2 o 2 with FeC 2 o 4 The mixing ratio is: H 2 o 2 : Fe 2+ = 3:1 molar ratio;

[0041] B. Send the mixed solution in step A into an industrial microwave oven with a power of 10kW and a working temperature of 5-30°C, and let it act in the microwave field for 60s;

[0042] C. Adjust the pH of the mixed solution in step B to 8.0 with sodium hydroxide, and the aeration rate is 40m 3 Under the aeration condition of / h, oxidation treatment (that is, aeration) for 1 h...

Embodiment 3

[0048] The method for microwave treatment of coking biochemical effluent provided by the present invention undergoes the following process steps:

[0049] A. Add H to the coking biochemical effluent to be treated 2 o 2 Mix reagent with ferrous carbonate to the mass concentration of hydrogen peroxide in water is 0.18%, stir and mix, make the mixed solution pH value be 4.0, wherein, H 2 o 2 The mixing ratio with ferrous carbonate is: H 2 o 2 : Fe 2+ = molar ratio of 1:4;

[0050] B. Send the mixed solution in step A into an industrial microwave oven with a power of 10kW and a working temperature of 5-30°C, and let it act in the microwave field for 30s;

[0051] C. Adjust the pH to 7.5 with milk of lime for the mixed liquor treated by microwave in step B. When the aeration rate is 30m 3 Under the aeration condition of / h, oxidation treatment (that is, aeration) for 2 hours, the upper liquid and the lower sludge are separated by sedimentation, and the sludge is sent to the ...

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 provides a method for treating coking biochemical effluent by microwave-oxidation-coagulation technology, which comprises the following steps of: A, adding a mixed reagent consisting of H2O2 and Fe2+ into the coking biochemical effluent until the mass concentration of hydrogen peroxide in water is between 0.01 and 1 percent, and controlling the pH to between 2.0 to 6.0; B, delivering the mixed liquid into an industrial microwave oven for processing for 5 to 60s; C, regulating the pH value of the mixed liquid to between 6.0 and 6.5 or 7.5 and 8.5, and carrying out oxidation treatment for 1 to 4 hours under an aeration condition that the aeration rate is 10 to 40m<3> / h; D, adding a coagulant into the liquid until the mass concentration of the coagulant in the liquid is betweenone millionth and one hundred thousandth; E, precipitating and separating; F, filtrating the liquid to obtain process effluent for recycling; and G, collecting sludge, separating the liquid from the sludge; and returning the liquid to the step D, and filter-pressing the sludge to obtain sludge cakes. The method realizes recycling, does not discharge sewage, and effectively solves the problem thatpresent coking sewage is difficult to treat and to recycle.

Description

technical field [0001] The invention relates to a method for treating coking biochemical effluent, in particular to a method for treating coking biochemical effluent by microwave-oxidation-coagulation technology, which belongs to the technical field of sewage treatment. Background technique [0002] Coking sewage is the sewage formed during the high-temperature carbonization process of coal, as well as the process of gas purification and chemical product refining. The pollutants in the sewage are various and complex, except for NH 3 -N, cyanide, thiocyanate, phenolic compounds, polycyclic aromatic compounds, heterocyclic organic compounds containing nitrogen, oxygen, sulfur, the overall property is NH 3 -N, high concentration of phenols and oils, many toxic and inhibitory substances, so it is a typical industrial organic wastewater with high concentration, high pollution, high toxicity and refractory degradation, which is very difficult in the existing biochemical treatment ...

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): C02F9/14C02F1/72C02F1/48C02F3/12C02F1/52
CPCY02W10/10
Inventor 李幼灵张竹明罗明发毛云海张昆华徐有生曹吉良叶亚雄张燕玲钟粤琼赵明华
Owner 云南天朗环境科技有限公司
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
Eureka Blog
Learn More
PatSnap group products