CN115196824A - High-salt, high-COD and low-B/C ratio organic wastewater treatment method and application - Google Patents
High-salt, high-COD and low-B/C ratio organic wastewater treatment method and application Download PDFInfo
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- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
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Abstract
The invention provides a method for treating organic wastewater with high salt, high COD and low B/C ratio and application thereof, wherein the method comprises the steps of adjusting the PH value of the organic wastewater to 3-5 to obtain a waste liquid A; concentrating to obtain condensed water solution and concentrated solution; adjusting the pH value of the condensed water solution to 7-9 to obtain a solution B; conveying the mixture into an anaerobic tank for denitrification treatment, and simultaneously converting refractory substances into small molecular substances under the anoxic condition, so as to improve biodegradability and obtain a mixed solution C; conveying the mixed solution C into an aerobic tank for nitrification and denitrification treatment of COD to obtain a mixed solution D; and (4) conveying the mixed solution D into a sedimentation tank for mud-water separation, and discharging supernatant. The method and the application of the invention avoid the increase of sludge amount caused by large dosage; the difficult problem that organic wastewater is not biochemical is solved; the stable and reliable operation of the system is improved; the influence of salinity in the organic wastewater on biochemical treatment is solved.
Description
Technical Field
The invention belongs to the field of sewage treatment, relates to an industrial production wastewater treatment technology, and particularly relates to a high-salt, high-COD and low-B/C ratio organic wastewater treatment method and application.
Background
With the development of the organic chemical industry and the improvement of the refinement rate, the yield of organic wastewater with high salt, high COD (chemical oxygen demand, which can reach 3000-10000 mg/L), high total nitrogen (which can reach 300-800 mg/L), low B/C ratio and high toxicity is continuously increased, but because the B/C value of the wastewater is less than 0.15, the wastewater has the characteristic of being non-biochemical, the difficulty in wastewater treatment is greatly increased, and meanwhile, the COD removal rate of the wastewater treated by adopting a conventional adsorption method, a chemical precipitation method, a high-grade oxidation method, a Fenton oxidation method and the like singly or in combination is low, and the treatment effect is not ideal, so that the existing organic wastewater treatment method is necessarily improved.
Disclosure of Invention
In order to solve the problems of high salt, high COD, low B/C ratio organic wastewater nonbiochemical and low COD removal rate, the invention designs a high salt, high COD and low B/C ratio organic wastewater treatment method and application thereof, and the treatment method provided by the invention can realize the aims of treating organic wastewater to ensure that COD in discharged liquid is less than or equal to 50mg/L, ammonia nitrogen is less than or equal to 5mg/L and total nitrogen is less than or equal to 15 mg/L.
The technical scheme for realizing the purpose of the invention is as follows:
in a first aspect, the invention provides a method for treating organic wastewater with high salt, high COD and low B/C ratio, which comprises the following steps:
adjusting the pH value of the organic wastewater to 3-5 by using an acid solution to obtain a waste liquid A;
concentrating the waste liquid A to obtain a condensed water liquid and a concentrated solution;
adjusting the pH value of the condensed water solution to 7-9 by using an alkali solution to obtain a solution B;
conveying the solution B into an anaerobic tank for denitrification treatment to obtain a mixed solution C;
conveying the mixed solution C into an aerobic tank for nitrification and denitrification treatment of COD to obtain a mixed solution D;
and conveying the mixed solution D into a sedimentation tank, carrying out mud-water separation in the sedimentation tank, and discharging the upper clear liquid.
According to the method for treating the organic wastewater with high salt, high COD and low B/C ratio, on one hand, salt in the organic wastewater can be separated through concentration; on the other hand, the condensed water liquid after concentration carries a small amount of COD, the increase of the B/C value in the condensed water liquid can meet the requirement of biochemical treatment, the COD in the discharged upper clear liquid of the organic wastewater treated by the method is less than or equal to 50mg/L, the ammonia nitrogen is less than or equal to 5mg/L, the total nitrogen is less than or equal to 15mg/L, and the removal rate of the COD in the organic wastewater can reach more than 98 percent.
In a modified embodiment, the acid solution is one or more of a hydrochloric acid solution and a sulfuric acid solution, and the concentration of the acid solution is in a range of 5-10%.
In a modified embodiment, the alkali solution is one or more of a sodium hydroxide solution and a sodium carbonate solution, and the alkali solution is in a range of 5-30%.
In a modified embodiment, the volume ratio of the condensed water liquid to the waste liquid A is 0.7-0.9.
In a modified embodiment, a circulating pipeline is also established between the anaerobic tank and the aerobic tank to convey the liquid in the aerobic tank into the anaerobic tank for denitrification treatment.
In a modified embodiment, a circulating pipeline is also established between the sedimentation tank and the anaerobic tank to convey the activated sludge at the bottom of the sedimentation tank into the anaerobic tank.
In an improved embodiment, when the anaerobic pond works, a carbon source and/or a phosphorus source nutrient solution is also added.
In a second aspect, the invention provides an application of a method for treating organic wastewater with high salt, high COD and low B/C ratio, wherein the method of the first aspect is adopted to treat copper-containing organic wastewater.
Compared with the prior art, the invention has the beneficial effects that: according to the method for treating the organic wastewater with high salt, high COD and low B/C ratio, on one hand, salt in the organic wastewater can be separated through concentration; on the other hand, the condensed water liquid after concentration carries a small amount of COD (most of the COD enters the concentrated liquid for subsequent drying landfill/drying incineration and other treatment), and the increase of the B/C value in the condensed water liquid can meet the requirement of biochemical treatment, the COD in the discharged upper clear liquid of the organic wastewater treated by the method is less than or equal to 50mg/L, the ammonia nitrogen is less than or equal to 5mg/L, the total nitrogen is less than or equal to 15mg/L, and the removal rate of the COD in the organic wastewater can reach more than 98 percent. Compared with the existing general method, the method of the invention avoids secondary pollution caused by the increase of sludge amount due to large dosage of medicament; the difficult problem of non-biodegradability of organic wastewater is solved; the stable and reliable operation of the system is improved; the influence of salinity in the organic wastewater on biochemical treatment is solved.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a flow chart of the method for treating organic wastewater with high salt content, high COD and low B/C ratio according to the invention;
FIG. 2 is a schematic block diagram of the system connection of the method for treating organic wastewater with high salt, high COD and low B/C ratio in the embodiment.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
The embodiment provides a method for treating organic wastewater with high salt, high COD and low B/C ratio, and as shown in figures 1 and 2, the method for treating organic wastewater comprises the following steps:
s1, adjusting the pH value of the organic wastewater to 3-5 by using an acid solution to obtain a waste liquid A.
In the step, the pH value of the organic wastewater is about 9-11, and in order to improve the biodegradability of subsequent condensed water liquid, the organic wastewater is conveyed into a pH adjusting tank containing a stirrer, and the pH value of the organic wastewater is adjusted to 3-5 by using an acid solution under the stirring condition.
Wherein, the acid solution used in the step is one or more of hydrochloric acid solution and sulfuric acid solution, and the concentration range of the acid solution is 5-10%.
Furthermore, when the organic wastewater is metal-containing organic wastewater or suspended matter-containing organic wastewater, such as copper-containing wastewater, nickel-containing wastewater, etc., before adjusting PH, metal ions in the metal-containing organic wastewater need to be removed, suspended matter in the suspended matter-containing organic wastewater needs to be removed, and the metal ions and the suspended matter can be removed by the conventional methods.
S2, concentrating the waste liquid A to obtain a condensed water liquid and a concentrated liquid.
In the step, the waste liquid A can be concentrated by adopting an evaporator under reduced pressure, specifically, the waste liquid A is conveyed into the evaporator by a pump and is concentrated under reduced pressure under the conditions that the vacuum degree is less than or equal to-0.08 MPa and the temperature is 50-60 ℃.
And (3) water vapor generated in the concentration process enters a condenser provided with a vacuum system for condensation, and condensate is conveyed into a condensate water tank and pumped into a water storage tank through a pump to obtain condensed water liquid. Wherein, when the COD content in the organic wastewater is 5000-10000 mg/L, the COD content in the condensed water liquid after concentration is less than about 1000mg/L, and meanwhile, the B/C ratio of the condensed water liquid collected after concentration is more than 0.4, thus meeting the requirements of biochemical treatment.
In order to reduce the amount of the concentrated liquid, during the concentration, the liquid and solid in the concentrated liquid are separated by filter press filtration, centrifuge centrifugation, standing, etc., and the separated liquid is sent back to the evaporator for concentration.
In this step, the volume ratio of the condensed water liquid to the waste liquid A after concentration is 0.7-0.9.
And S3, adjusting the pH value of the condensed water liquid to 7-9 by using an alkali solution to obtain a solution B.
The pH value of the condensed water liquid recovered in the step S2 is about 2-4, and the pH value needs to be adjusted within the range of 7-9 so as to facilitate subsequent biochemical treatment.
In the step, the PH value of condensed water liquid is adjusted in a water storage tank, meanwhile, the alkaline solution used in the step is one or more of a sodium hydroxide solution and a sodium carbonate solution, and the range of the alkaline solution is 5-30%.
And S4, conveying the solution B into an anaerobic tank for denitrification treatment to obtain a mixed solution C.
In the step, the solution B is conveyed into an anaerobic tank by a pump, denitrification treatment is carried out by denitrifying bacteria in the anaerobic tank, and meanwhile, the refractory substances are converted into micromolecular substances under the anoxic condition, so that the biodegradability is improved.
Further, when the anaerobic tank works, a carbon source and/or a phosphorus source nutrient solution is added, and specifically, the carbon source and/or the phosphorus source nutrient solution is added into the anaerobic tank through a nutrient tank so as to provide nutrition for denitrifying bacteria and digestive bacteria and ensure the activity of the denitrifying bacteria and the digestive bacteria.
S5, conveying the mixed solution C into an aerobic tank for nitrification and denitrification treatment of COD to obtain a mixed solution D.
In the step, the mixed solution C treated by the anaerobic tank is output to an aerobic tank, COD is degraded and digested by nitrifying bacteria and aerobic bacteria in the aerobic tank, and ammonia nitrogen is converted into nitrate nitrogen.
Further, in order to treat nitrate nitrogen, the total nitrogen content in the supernatant in the step S6 is reduced, a circulating pipeline is also established between the anaerobic tank and the aerobic tank, and partial liquid in the aerobic tank is conveyed to the anaerobic tank for denitrification treatment. Preferably, the reflux ratio of the aerobic tank to the anaerobic tank is 100-200%.
S6, conveying the mixed solution D into a sedimentation tank, carrying out mud-water separation in the sedimentation tank, and discharging supernatant.
In a modified embodiment of the step, a circulating pipeline is also established between the sedimentation tank and the anaerobic tank, and the activated sludge at the bottom of the sedimentation tank is conveyed into the anaerobic tank.
According to the method for treating the organic wastewater with high salt, high COD and low B/C ratio, on one hand, salt in the organic wastewater can be separated through concentration; on the other hand, the condensed water liquid after concentration carries a small part of COD, and the increase of the B/C value in the condensed water liquid can meet the requirement of biochemical treatment, the COD in the discharged upper clear liquid of the organic wastewater treated by the method is less than or equal to 50mg/L, the ammonia nitrogen is less than or equal to 5mg/L, the total nitrogen is less than or equal to 15mg/L, and the removal rate of the COD in the organic wastewater can reach more than 98 percent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (8)
1. A method for treating organic wastewater with high salt, high COD and low B/C ratio is characterized by comprising the following steps:
adjusting the pH value of the organic wastewater to 3-5 by using an acid solution to obtain a waste liquid A;
concentrating the waste liquid A to obtain a condensed water liquid and a concentrated solution;
adjusting the pH value of the condensed water solution to 7-9 by using an alkali solution to obtain a solution B;
conveying the solution B into an anaerobic tank for denitrification treatment to obtain a mixed solution C;
conveying the mixed solution C into an aerobic tank for nitrification and denitrification treatment of COD to obtain a mixed solution D;
and conveying the mixed solution D into a sedimentation tank, carrying out mud-water separation in the sedimentation tank, and discharging the upper clear liquid.
2. The method for treating organic wastewater with high salt content, high COD and low B/C ratio according to claim 1, wherein the method comprises the following steps: the acid solution is one or more of hydrochloric acid solution and sulfuric acid solution, and the concentration range of the acid solution is 5-10%.
3. The method for treating organic wastewater with high salt content, high COD and low B/C ratio according to claim 1, wherein the method comprises the following steps: the alkali solution is one or more of sodium hydroxide solution and sodium carbonate solution, and the range of the alkali solution is 5-30%.
4. The method for treating organic wastewater with high salt content, high COD and low B/C ratio according to claim 1, wherein the method comprises the following steps: the volume ratio of the condensed water liquid to the waste liquid A is 0.7-0.9.
5. The method for treating organic wastewater with high salt content, high COD and low B/C ratio according to claim 1, wherein the method comprises the following steps: and a circulating pipeline is also established between the anaerobic tank and the aerobic tank, and part of liquid in the aerobic tank is conveyed into the anaerobic tank for denitrification treatment.
6. The method for treating organic wastewater with high salt content, high COD and low B/C ratio according to claim 1, wherein the method comprises the following steps: and a circulating pipeline is also established between the sedimentation tank and the anaerobic tank and used for conveying the activated sludge at the bottom of the sedimentation tank into the anaerobic tank.
7. The method for treating organic wastewater with high salt content, high COD and low B/C ratio according to claim 1, wherein the method comprises the following steps: and when the anaerobic tank works, a carbon source and/or a phosphorus source nutrient solution is also added.
8. The application of the method for treating the organic wastewater with high salt, high COD and low B/C ratio is characterized in that: the method according to any one of claims 1 to 7 is used for treating copper-containing organic wastewater.
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| CN111704321A (en) * | 2020-07-01 | 2020-09-25 | 中国计量大学 | Pesticide wastewater treatment process |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101265003A (en) * | 2008-04-21 | 2008-09-17 | 北京水气蓝德环保科技有限公司 | Method for treating high-concentration organic sewage difficult to degrade |
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| CN108439694A (en) * | 2018-02-12 | 2018-08-24 | 东华大学 | High organic wastewater with high salt is concentrated by evaporation the processing method of coupling thermocatalytic carbon crystallization |
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