CN112679043A - High-oil high-suspension high-ammonia nitrogen food wastewater pretreatment system and method - Google Patents
High-oil high-suspension high-ammonia nitrogen food wastewater pretreatment system and method Download PDFInfo
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- CN112679043A CN112679043A CN202011558083.8A CN202011558083A CN112679043A CN 112679043 A CN112679043 A CN 112679043A CN 202011558083 A CN202011558083 A CN 202011558083A CN 112679043 A CN112679043 A CN 112679043A
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Abstract
The invention relates to the technical field of food wastewater treatment, and discloses a high-oil high-suspension high-ammonia nitrogen food wastewater pretreatment method, which comprises the following steps: s1: arranging a coarse grating and a fine grating in the grating tank, and introducing the wastewater into the grating tank to intercept larger suspended matters; s2: introducing the wastewater intercepted in the grating tank into an oil separation tank to skim out the grease, blocking the grease through oil separation filter membranes distributed up and down in the oil separation tank, and pumping out the suspended grease through a pump body; s3: aerobic strains are put in the pre-aeration adjusting tank in advance, and then the wastewater after oil skimming is introduced into the pre-aeration adjusting tank. The treatment system has the advantages that the removal rate of oil substances is more than 98%, the removal rate of suspended matters is more than 99%, the removal rate of COD is more than 70%, the PH value of water can be effectively prevented from being reduced to be less than 4.5, the subsequent alkali input amount is reduced, the total nitrogen and ammonia nitrogen are also obviously removed, the removal rate is more than 30%, the retention time of subsequent biochemical reactions is reduced, and the subsequent treatment stability is improved.
Description
Technical Field
The invention relates to the technical field of food wastewater treatment, in particular to a high-oil high-suspension high-ammonia nitrogen food wastewater pretreatment system and a method.
Background
The traditional treatment of high-oil high-suspension high-ammonia nitrogen food wastewater generally adopts a grating pool, an adjusting pool, an anaerobic pool, an aerobic pool and a secondary sedimentation pool, and the pretreatment stage (the grating pool and the adjusting pool) generally has the problems that oil generates humic acid in the adjusting pool stage, so that the acidity of wastewater is enhanced, the oil substances of animals and plants are easy to float to the rear section to generate humic acid, so that the system is unstable, the secondary sedimentation pool is easy to generate floating mud and the like, and food processing enterprises face production stoppage and rectification under the situation of strict environmental supervision.
Disclosure of Invention
The invention aims to provide a high-oil high-suspension high-ammonia nitrogen food wastewater pretreatment system and a high-oil high-suspension high-ammonia nitrogen food wastewater pretreatment method, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a pretreatment method of high-oil high-suspension high-ammonia nitrogen food wastewater comprises the following steps:
s1: arranging a coarse grating and a fine grating in the grating tank, and introducing the wastewater into the grating tank to intercept larger suspended matters;
s2: introducing the wastewater intercepted in the grating tank into an oil separation tank to skim out the grease, blocking the grease through oil separation filter membranes distributed up and down in the oil separation tank, and pumping out the suspended grease through a pump body;
s3: aerobic strains are put into the pre-aeration regulating tank in advance, then the wastewater after oil skimming is introduced into the pre-aeration regulating tank, organic matters in the wastewater are subjected to preliminary aerobic decomposition, and the COD concentration is reduced;
s4: adding a coagulant into the reaction tank, introducing the wastewater subjected to aerobic decomposition into the reaction tank, and stirring by a stirrer to generate a mixture;
s5: and introducing the wastewater after the reaction into an air flotation tank, floating the mixture along with fine bubbles through the air flotation tank, and collecting floating mud.
As a still further scheme of the invention: the depth of the pre-aeration adjusting tank is 2.5-6 m, and the retention time is more than 12 hours.
As a still further scheme of the invention: the mixture is a combination of finely dispersed oil, emulsified oil and flocculent particles.
As a still further scheme of the invention: the air floatation tank is an electric flocculation air floatation tank, and the reaction tank is composed of an electric flocculation reaction tank.
As a still further scheme of the invention: the oil separation tank is an oil skimming machine.
As a still further scheme of the invention: the coarse grating and the fine grating are respectively arranged on the water inlet end and the water outlet end of the grating pool.
As a still further scheme of the invention: the reaction time of the wastewater in the reaction tank is 30-60 min, and the stirring speed of the stirrer is 80-150 r/min.
The utility model provides a high-oil high-suspended matter high ammonia nitrogen food wastewater pretreatment system, includes grid pond, oil interceptor, preliminary aeration equalizing basin, reaction tank and the air supporting pond that connects gradually, the grid pond is arranged in damming the great suspended solid in the waste water, the oil interceptor is arranged in driving away the grease in the waste water, preliminary aerobic decomposition is carried out to the organic matter in the waste water to the preliminary aeration equalizing basin in advance to reduce COD concentration, the reaction tank is used for mixing the back with waste water and coagulant and reacts, and generates slight flocculent particles thing, the air supporting pond is used for carrying out solid-liquid separation with waste water to the superficial mud of will separating is collected.
Compared with the prior art, the invention has the beneficial effects that: the treatment system has the advantages that the removal rate of oil substances is more than 98%, the removal rate of suspended matters is more than 99%, the removal rate of COD is more than 70%, the PH value of water can be effectively prevented from being reduced to be less than 4.5, the subsequent alkali input amount is reduced, the total nitrogen and ammonia nitrogen are also obviously removed, the removal rate is more than 30%, the retention time of subsequent biochemical reactions is reduced, and the subsequent treatment stability is improved.
Drawings
FIG. 1 is a schematic structural diagram of a high-oil high-suspension high-ammonia nitrogen food wastewater pretreatment system.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a method for pretreating high-oil high-suspension high-ammonia nitrogen food wastewater includes the following steps:
s1: arranging a coarse grating and a fine grating in the grating tank, and introducing the wastewater into the grating tank to intercept larger suspended matters;
s2: introducing the wastewater intercepted in the grating tank into an oil separation tank to skim out the grease, blocking the grease through oil separation filter membranes distributed up and down in the oil separation tank, and pumping out the suspended grease through a pump body;
s3: aerobic strains are put into the pre-aeration regulating tank in advance, then the wastewater after oil skimming is introduced into the pre-aeration regulating tank, organic matters in the wastewater are subjected to preliminary aerobic decomposition, and the COD concentration is reduced;
s4: adding a coagulant into the reaction tank, introducing the wastewater subjected to aerobic decomposition into the reaction tank, and stirring by a stirrer to generate a mixture;
s5: and introducing the wastewater after the reaction into an air flotation tank, floating the mixture along with fine bubbles through the air flotation tank, and collecting floating mud.
Preferably: the depth of the pre-aeration adjusting tank is 2.5-6 m, and the retention time is more than 12 hours.
Preferably: the mixture is a composition of finely dispersed oil, emulsified oil and flocculent particles.
Preferably: the air floatation tank is an electric flocculation air floatation tank, and the reaction tank is composed of an electric flocculation reaction tank.
Preferably: the oil separation tank is an oil skimming machine.
Preferably: the coarse grating and the fine grating are respectively arranged on the water inlet end and the water outlet end of the grating pool.
Preferably: the reaction time of the wastewater in the reaction tank is 50min, and the stirring speed of the stirrer is 100 r/min.
The utility model provides a high-oil high-suspended matter high ammonia nitrogen food wastewater pretreatment system, including the grid pond that connects gradually, the oil interceptor, the preliminary aeration equalizing basin, reaction tank and air supporting pond, the grid pond is arranged in damming the great suspended matter in the waste water, the oil interceptor is arranged in driving away the grease in the waste water, the preliminary aerobic decomposition is carried out to the organic matter in the waste water to the preliminary aeration equalizing basin in advance, and reduce COD concentration, the reaction tank is used for mixing waste water and coagulant back and reacting, and generate slight flocculent particles, the air supporting pond is used for carrying out solid-liquid separation with waste water, and collect the superficial mud of separating.
The treatment system has the advantages that the removal rate of oil substances is more than 98%, the removal rate of suspended matters is more than 99%, the removal rate of COD is more than 70%, the PH value of water can be effectively prevented from being reduced to be less than 4.5, the subsequent alkali input amount is reduced, the total nitrogen and ammonia nitrogen are also obviously removed, the removal rate is more than 30%, the retention time of subsequent biochemical reactions is reduced, and the subsequent treatment stability is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (8)
1. A pretreatment method of high-oil high-suspension high-ammonia nitrogen food wastewater is characterized by comprising the following steps:
s1: arranging a coarse grating and a fine grating in the grating tank, and introducing the wastewater into the grating tank to intercept larger suspended matters;
s2: introducing the wastewater intercepted in the grating tank into an oil separation tank to skim out the grease, blocking the grease through oil separation filter membranes distributed up and down in the oil separation tank, and pumping out the suspended grease through a pump body;
s3: aerobic strains are put into the pre-aeration regulating tank in advance, then the wastewater after oil skimming is introduced into the pre-aeration regulating tank, organic matters in the wastewater are subjected to preliminary aerobic decomposition, and the COD concentration is reduced;
s4: adding a coagulant into the reaction tank, introducing the wastewater subjected to aerobic decomposition into the reaction tank, and stirring by a stirrer to generate a mixture;
s5: and introducing the wastewater after the reaction into an air flotation tank, floating the mixture along with fine bubbles through the air flotation tank, and collecting floating mud.
2. The pretreatment method of high-oil high-suspension high-ammonia nitrogen food wastewater according to claim 1, characterized in that the depth of the pre-aeration adjusting tank is 2.5-6 m, and the retention time is more than 12 hours.
3. The method for pretreating food wastewater with high oil content, high suspension content and high ammonia nitrogen content according to claim 1, wherein the mixture is a composition of finely dispersed oil, emulsified oil and flocculent particles.
4. The pretreatment method of high-oil high-suspension high-ammonia nitrogen food wastewater according to claim 1, characterized in that the flotation tank is an electrocoagulation flotation tank, and the reaction tank is an electrocoagulation reaction tank.
5. The method for pretreating high-oil high-suspension high-ammonia nitrogen food wastewater according to claim 1, wherein the oil separation tank is an oil skimming machine.
6. The pretreatment method of high-oil high-suspension high-ammonia nitrogen food wastewater according to claim 1, wherein the coarse grating and the fine grating are respectively installed on the water inlet end and the water outlet end of the grating pond.
7. The method for pretreating food wastewater with high oil content, high suspension content and high ammonia nitrogen content according to claim 1, wherein the reaction time of the wastewater in the reaction tank is 30-60 min, and the stirring speed of the stirrer is 80-150 r/min.
8. The utility model provides a high ammonia nitrogen food wastewater pretreatment systems of high oily high suspension, its characterized in that, including grid pond, oil interceptor, preliminary aeration equalizing basin, reaction tank and the air supporting pond that connects gradually, the grid pond is arranged in damming the great suspended solid in the waste water, the oil interceptor is arranged in driving away the grease in the waste water, preliminary good oxygen decomposition is carried out to the organic matter in the waste water to the preliminary aeration equalizing basin is used for carrying out the good oxygen of preliminary aeration and is decomposed to reduce COD concentration, the reaction tank is used for mixing the back and reacting waste water and coagulant, and generates slight flocculent particles thing, the air supporting pond is used for carrying out solid-liquid separation with waste water to the superficial mud of will separating is collected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011558083.8A CN112679043A (en) | 2020-12-25 | 2020-12-25 | High-oil high-suspension high-ammonia nitrogen food wastewater pretreatment system and method |
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| CN202011558083.8A CN112679043A (en) | 2020-12-25 | 2020-12-25 | High-oil high-suspension high-ammonia nitrogen food wastewater pretreatment system and method |
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| CN112679043A true CN112679043A (en) | 2021-04-20 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102633359A (en) * | 2012-04-23 | 2012-08-15 | 中蓝连海设计研究院 | Method for treating total nitrogen of nitrogen-containing chemical wastewater |
| CN103613245A (en) * | 2013-12-02 | 2014-03-05 | 安徽省绿巨人环境技术有限公司 | Treatment process for waste water in neuropeptide product production |
| CN109052827A (en) * | 2018-08-21 | 2018-12-21 | 重庆中标环保集团有限公司 | Food waste percolate enhanced processing method and system |
| CN208883670U (en) * | 2018-08-21 | 2019-05-21 | 苏州市华测检测技术有限公司 | A kind of kitchen waste water processing unit |
-
2020
- 2020-12-25 CN CN202011558083.8A patent/CN112679043A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102633359A (en) * | 2012-04-23 | 2012-08-15 | 中蓝连海设计研究院 | Method for treating total nitrogen of nitrogen-containing chemical wastewater |
| CN103613245A (en) * | 2013-12-02 | 2014-03-05 | 安徽省绿巨人环境技术有限公司 | Treatment process for waste water in neuropeptide product production |
| CN109052827A (en) * | 2018-08-21 | 2018-12-21 | 重庆中标环保集团有限公司 | Food waste percolate enhanced processing method and system |
| CN208883670U (en) * | 2018-08-21 | 2019-05-21 | 苏州市华测检测技术有限公司 | A kind of kitchen waste water processing unit |
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Application publication date: 20210420 |