CN111995182A - Resourceful treatment system and method for using potato starch wastewater as carbon source for sewage plant supply - Google Patents
Resourceful treatment system and method for using potato starch wastewater as carbon source for sewage plant supply Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention provides a resource treatment system and a resource treatment method for potato starch wastewater as a carbon source supplement of a sewage plant, wherein the system comprises a primary wastewater treatment unit of a potato starch processing enterprise and a sewage treatment unit of a downstream sewage treatment plant, and the primary wastewater treatment unit of the potato starch processing enterprise and the sewage treatment unit of the downstream sewage treatment plant are communicated through a sewage receiving pipe network; the preliminary wastewater treatment unit of the potato starch processing enterprise comprises an anaerobic biological treatment unit and an air floatation device which are sequentially arranged, and the sewage treatment unit of a downstream sewage treatment plant comprises a hydrolysis acidification tank, an AAO process unit and an advanced treatment unit which are sequentially arranged. The method reduces the carbon source adding amount of the sewage treatment plant on the basis of standard discharge of the sewage treatment plant, reduces the medicament cost, and is a means for effectively recycling the potato starch wastewater.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a resourceful treatment system and a resourceful treatment method for taking potato starch wastewater as a carbon source for supplying in a sewage plant.
Background
The potato starch wastewater is mainly generated in the procedures of washing, filing, extracting, refining, dehydrating, drying and the like in the production process of the potato starch. The wastewater has the characteristics of high organic matter concentration and good biodegradability. The waste water contains organic matters such as starch, protein, polysaccharide and the like, the B/C ratio is generally more than 0.5, the C/N is far higher than 5:1, and the waste water has sufficient carbon sources for biological denitrification. Generally, potato starch processing enterprises firstly treat the generated wastewater, and effluent quality indexes such as COD (chemical oxygen demand) and the like need to reach the nano-tube standard of a downstream sewage treatment plant. At present, starch processing enterprises producing wastewater bear wastewater treatment costs of about 1-1.5 yuan/ton. The wastewater is discharged into a downstream sewage treatment plant and needs to be further treated so as to reach the integrated wastewater discharge standard (GB 8979-1996).
With the national emission requirements for nitrogen pollutants in water becoming stricter and stricter, the denitrification effect of sewage treatment plants needs to be further improved. Biological treatment, the most widely used denitrification process, requires a sufficient carbon source to achieve denitrification. Practical experience shows that the sewage plant has the problem of insufficient carbon source. As BOD in sewage5/N<3-5, organic carbon source must be added additionally. At present, the external carbon sources used in actual operation and scientific research work mainly include low-molecular organic matters, natural organic solids, high-concentration organic wastewater and the like, wherein the most common substances are methanol, ethanol, glucose and the like. Such materials are considered to be ideal carbon sources most readily available to microorganisms, but result in increased operating costs. The scale of a certain treatment is 25000m3In the sewage treatment plant of/d, 0.04kg of glucose is consumed per ton of water, and the operation cost is nearly 10 percent.
Therefore, especially for a sewage treatment plant which receives sewage containing potato starch wastewater, the simply treated potato starch wastewater is used as a supplement carbon source of the sewage treatment plant, so that the carbon source adding amount of the sewage treatment plant can be reduced, the medicament cost is reduced, and the method is a resource treatment means for the potato starch wastewater.
Disclosure of Invention
In view of the above, the invention aims to provide a resource treatment system and method for potato starch wastewater as a carbon source supplement for a sewage plant, which can reduce the carbon source adding amount of the sewage plant and the medicament cost on the one hand on the basis of standard discharge of the sewage plant; on the other hand, the potato starch wastewater is treated in a recycling way, so that the wastewater treatment investment of potato starch processing enterprises is reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
a resource treatment system for taking potato starch wastewater as a carbon source supply of a sewage plant comprises a primary wastewater treatment unit of a potato starch processing enterprise and a sewage treatment unit of a downstream sewage treatment plant, wherein the primary wastewater treatment unit of the potato starch processing enterprise and the sewage treatment unit of the downstream sewage treatment plant are communicated through a sewage receiving pipe network;
the potato starch processing enterprise wastewater primary treatment unit comprises an anaerobic biological treatment unit and an air floatation device which are sequentially arranged, wherein the anaerobic biological treatment unit is used for converting non-dissolved organic matters in wastewater into dissolved organic matters, and the air floatation device is used for removing suspended matters, surface active substances and organic pollutants in the wastewater; the sewage treatment unit of the downstream sewage treatment plant comprises a hydrolysis acidification tank, an AAO (anaerobic-anoxic-oxic) process unit and an advanced treatment unit which are sequentially arranged, wherein the hydrolysis acidification tank is used for improving the biodegradability of sewage so as to ensure the normal operation of subsequent biological treatment, the AAO process unit is used for realizing the synchronous nitrogen and phosphorus removal of the sewage, and the advanced treatment unit is used for further realizing the standard discharge of the sewage.
Further, still include the preliminary sedimentation pond among the potato starch processing enterprise waste water preliminary treatment unit, the preliminary sedimentation pond sets up before the anaerobism biological treatment unit for detach the insoluble impurity in the waste water.
Further, still include first grid in the potato starch processing enterprise waste water preliminary treatment unit, first grid sets up before the primary sedimentation pond for get rid of the impurity in the potato starch waste water, in order to alleviate the processing load of follow-up processing structure.
Further, the sewage treatment unit of the downstream sewage treatment plant also comprises an aeration grit chamber which is arranged in front of the hydrolysis acidification tank and used for removing inorganic sand grains in the sewage.
Further, the sewage treatment unit of the downstream sewage treatment plant also comprises a second grid which is arranged in front of the aeration grit chamber and used for removing floaters in sewage and preventing the water pump unit from being blocked.
Further, the sewage treatment unit of the downstream sewage treatment plant also comprises a secondary sedimentation tank, and the secondary sedimentation tank is arranged between the AAO process unit and the advanced treatment unit and is used for carrying out sludge-water separation.
Further, the advanced treatment unit comprises flocculation, filtration and disinfection processes.
The invention also provides a resource treatment method for the resource treatment system using the potato starch wastewater as the carbon source for the sewage plant.
Further, before sewage enters a sewage treatment unit of a downstream sewage treatment plant through the sewage receiving pipe network, sewage defoaming treatment needs to be carried out.
The invention has the beneficial effect of providing a resourceful treatment system and a resourceful treatment method which take potato starch wastewater as a carbon source supply for potato starch processing enterprises and downstream sewage treatment plants receiving wastewater generated by the enterprises. The method reduces the carbon source adding amount of a sewage treatment plant, reduces the medicament cost, and simultaneously reduces the wastewater treatment investment of potato starch processing enterprises. In addition, the invention can be realized on the basis of the original facility by changing the operation method, thereby saving the modification cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a recycling system according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a resourceful treatment system and a resourceful treatment method taking potato starch wastewater as a carbon supply source, which comprise a wastewater primary treatment process of a potato starch processing enterprise and a sewage treatment process of a sewage receiving pipe network and a downstream sewage treatment plant. Potato starch wastewater is simply and necessarily treated at one end of a potato starch processing enterprise, so that the wastewater is kept with organic matter concentration capable of meeting the requirements of part or all of carbon sources of a downstream sewage treatment plant, and then the wastewater is discharged into a sewage treatment process of the downstream sewage treatment plant.
Specifically, the resource treatment method comprises the steps of enabling potato starch wastewater to pass through a wastewater primary treatment unit of a potato starch processing enterprise, enabling the wastewater to retain an organic carbon source, and discharging the wastewater into a sewage treatment unit of a downstream sewage treatment plant through a sewage receiving pipe network.
After being subjected to primary treatment in starch processing enterprises, the potato starch wastewater is discharged into a downstream sewage treatment plant through a sewage receiving pipe network for further treatment. In the process, the protein content in the wastewater is high, and when the wastewater enters a sewage treatment plant from a pipeline, the volume of the foam layer can be 35-50% of the total volume at most, so that a defoaming agent needs to be added.
Referring to fig. 1, a resourceful treatment system of the present invention is explained. The resource treatment system comprises a potato starch processing enterprise wastewater primary treatment unit and a downstream sewage treatment plant sewage treatment unit, wherein the potato starch processing enterprise wastewater primary treatment unit is communicated with the downstream sewage treatment plant sewage treatment unit through a sewage receiving pipe network;
the preliminary treatment unit of potato starch processing enterprise waste water includes first grid, the pond that just sinks, anaerobism biological treatment unit, air supporting device that sets gradually.
The first grating is used for removing impurities such as small potatoes, roots, buds, leaves, grass, silt, starch granules, fibers and the like in the potato starch wastewater so as to reduce the treatment load of a subsequent treatment structure. The function of the primary sedimentation tank is to further remove insoluble impurities in the wastewater so as to avoid blocking the pipeline. The anaerobic biological treatment unit has the functions of gradually converting non-dissolved organic matters in the wastewater into dissolved organic matters and converting macromolecular substances which are difficult to biodegrade, such as soluble protein, polysaccharide and the like, into micromolecular substances which are easy to biodegrade, such as organic acid and the like, so that the biodegradability of the wastewater is greatly improved. The air floatation device is suitable for treating small and medium-volume industrial wastewater, and can well remove suspended matters, surface active substances and a small amount of organic pollutants in the wastewater.
The sewage treatment unit of the downstream sewage treatment plant comprises a second grid, an aeration grit chamber, a hydrolysis acidification tank, an AAO process unit, a secondary sedimentation tank and an advanced treatment unit which are arranged in sequence.
The aeration grit chamber is used for removing inorganic sand particles in sewage, the AAO process unit is used for realizing nitrogen and phosphorus removal of sewage, and the secondary sedimentation tank is used for separating mud from water.
The second grating is used for removing larger floating objects in the sewage to prevent the blockage of the water pump unit. The aeration grit chamber utilizes blast aeration to make water flow in the chamber perform rotational flow movement, so that sand grains and organic matters in water are separated to remove inorganic sand grains with larger grain size, and the normal operation of a subsequent treatment process is ensured. The function of the hydrolysis acidification tank is to further improve the biodegradability of sewage so as to ensure the normal operation of subsequent biological treatment. The AAO process unit realizes synchronous nitrogen and phosphorus removal by utilizing different functions of anaerobism, anoxia and aerobism. And the secondary sedimentation tank is used for separating mud and water again. The advanced treatment unit is used for performing flocculation, filtration, disinfection and other processes on the sewage filtered by the secondary sedimentation tank, is a conventional treatment process adopted by a sewage treatment plant to ensure that the quality of the effluent water reaches the standard, and is used for further realizing the standard discharge of the sewage.
The problems of low C/N ratio and insufficient carbon source generally exist in the operation process of the traditional AAO process, and a method of adding a carbon source additionally in an anoxic tank is generally adopted to ensure that denitrification is carried out efficiently. In the invention, upstream potato starch processing enterprises only carry out primary treatment on the potato starch wastewater, thereby improving the biodegradability of the wastewater and leading BOD (biochemical oxygen demand) to be increased5The concentration is maintained at a certain level. The primarily treated potato starch wastewater is discharged into a downstream sewage treatment plant, and sufficient organic matters in the wastewater can completely or mostly meet the carbon source required by denitrification of an anoxic section of the AAO process, and no or a small amount of additional carbon source is needed.
The wastewater discharge value of the potato starch processing enterprise needs to be determined according to the requirement of a downstream sewage treatment plant on a carbon source, and then the primary wastewater treatment process of the potato starch processing enterprise is determined according to the wastewater discharge value of the potato starch. The present invention will be illustrated in detail by the following examples.
A certain sewage treatment plant adopts a sewage treatment process of 'grating + aerated grit chamber + hydrolytic acidification tank + AAO process + secondary sedimentation tank + flocculation + filtration + disinfection' shown in figure 1. The treatment water volume of the sewage treatment plant is 20000m3The amount of carbon source (glucose) added was 1.7 t/d. According to the operation experience value, 1g of BOD with glucose equivalent to 0.53g is added5Therefore, 1.5t/d glucose is equivalent to 0.9t/d BOD5I.e. the additional BOD required by the wastewater treatment plant5Is 0.9 t/d.
A potato starch processing plant was located upstream of the wastewater treatment plant and produced potato starch wastewater having a quality as shown in Table 1. As mentioned above, the additional BOD required by downstream wastewater treatment plants50.9t/d, about 600mg/L of BOD is additionally discharged every day by the potato starch processing enterprise5。
TABLE 1 Potato starch wastewater quality of certain enterprises
| Item | Water quantity/m3·d-1 | pH | SS/mg·L-1 | COD/mg·L-1 | BOD5/mg·L-1 | Ammonia nitrogen/mg.L-1 |
| Concentration of | 1500 | 4-6 | 2000 | 12000 | 6000 | 150 |
The original water quality standard of the wastewater discharged into the downstream sewage treatment plant by the potato starch processing enterprise can refer to the Water quality Standard for discharging the wastewater into the urban sewer (GB/T31962-5The concentration was 350 mg/L. Now to supplement the additional required BOD of the downstream sewage treatment plant5BOD of wastewater discharged by the potato starch processing enterprise5The value should be 950 mg/L.
According to technical specifications of sewage treatment engineering of an upflow anaerobic sludge bed reactor (HJ 2013-Technical specification, anaerobic biological treatment on BOD5The removal rate of (A) is 60 to 80%. Research shows that the combined technology of 'grating + regulating tank + UASB' is used for BOD in potato starch wastewater5The removal rate of the wastewater is 81.3 percent, and the post-positioned air flotation device can further remove more than 20 percent of BOD in the wastewater5. Therefore, the primary treatment process of the potato starch wastewater of the 'grating, the primary sedimentation tank, the anaerobic biological treatment and the air floatation device' can reach more than 85 percent of BOD5The removal rate is satisfied with the BOD of the inlet water56000mg/L, BOD of the effluent5The water quality requirement of inlet and outlet water is about 950 mg/L.
The resourceful treatment system and method for using potato starch wastewater as the carbon source for the sewage plant have obvious economic benefits. On one hand, potato starch processing enterprises can reduce the construction investment of an aerobic tank and an advanced treatment process in a wastewater treatment process, and correspondingly can reduce the operation cost by about 40%; on the other hand, the addition amount of the extra carbon source can be reduced by 100% at most in the downstream sewage treatment plant, so that the medicament cost is saved, and the operation cost is reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides a potato starch waste water is as resourceful processing system of sewage plant supply carbon source which characterized in that: the system comprises a potato starch processing enterprise wastewater primary treatment unit and a downstream sewage treatment plant sewage treatment unit, wherein the potato starch processing enterprise wastewater primary treatment unit is communicated with the downstream sewage treatment plant sewage treatment unit through a sewage receiving pipe network;
the potato starch processing enterprise wastewater primary treatment unit comprises an anaerobic biological treatment unit and an air floatation device which are sequentially arranged, wherein the anaerobic biological treatment unit is used for converting non-dissolved organic matters in wastewater into dissolved organic matters, and the air floatation device is used for removing suspended matters, surface active substances and organic pollutants in the wastewater; the sewage treatment unit of the downstream sewage treatment plant comprises a hydrolysis acidification tank, an AAO (anaerobic-anoxic-oxic) process unit and an advanced treatment unit which are sequentially arranged, wherein the hydrolysis acidification tank is used for improving the biodegradability of sewage so as to ensure the normal operation of subsequent biological treatment, the AAO process unit is used for realizing the synchronous nitrogen and phosphorus removal of the sewage, and the advanced treatment unit is used for further realizing the standard discharge of the sewage.
2. The resourceful treatment system according to claim 1, characterized in that: still include the primary sedimentation pond among the potato starch processing enterprise waste water preliminary treatment unit, the primary sedimentation pond sets up before the anaerobism biological treatment unit for detach the insoluble impurity in the waste water.
3. The resourceful treatment system according to claim 2, characterized in that: still include first grid in the potato starch processing enterprise waste water preliminary treatment unit, first grid sets up before the primary sedimentation pond for get rid of the impurity in the potato starch waste water, in order to alleviate the processing load of follow-up processing structure.
4. The resourceful treatment system according to any one of claims 1 to 3, characterized in that: the sewage treatment unit of the downstream sewage treatment plant also comprises an aeration grit chamber which is arranged in front of the hydrolysis acidification tank and used for removing inorganic sand grains in sewage.
5. The resourceful treatment system according to claim 4, characterized in that: the sewage treatment unit of the downstream sewage treatment plant further comprises a second grid, and the second grid is arranged in front of the aeration grit chamber and used for removing floaters in sewage and preventing a water pump unit from being blocked.
6. The resourceful treatment system according to claim 1, characterized in that: the sewage treatment unit of the downstream sewage treatment plant also comprises a secondary sedimentation tank, and the secondary sedimentation tank is arranged between the AAO process unit and the advanced treatment unit and is used for carrying out sludge-water separation.
7. The resourceful treatment system according to claim 1, characterized in that: the advanced treatment unit comprises flocculation, filtration and disinfection processes.
8. A resource treatment method for the resource treatment system of the potato starch wastewater as the carbon source for the sewage plant according to any one of claims 1 to 7, characterized in that the potato starch wastewater is firstly passed through a primary treatment unit of the potato starch processing enterprise wastewater, so that the organic carbon source is retained in the wastewater, and the wastewater is discharged into a sewage treatment unit of a downstream sewage treatment plant through a sewage storage pipe network.
9. The recycling method according to claim 8, wherein: before sewage enters a sewage treatment unit of a downstream sewage treatment plant through the sewage receiving pipe network, sewage defoaming treatment needs to be carried out.
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| CN113307450A (en) * | 2021-05-27 | 2021-08-27 | 公安县佳源水务有限公司 | Diversion system in sewage treatment system |
| CN113620429A (en) * | 2021-08-30 | 2021-11-09 | 中车环境科技有限公司 | Carbon source supplementing process for sewage treatment based on food wastewater |
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| CN113620429A (en) * | 2021-08-30 | 2021-11-09 | 中车环境科技有限公司 | Carbon source supplementing process for sewage treatment based on food wastewater |
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