CN110981111A - Pig farm wastewater treatment method - Google Patents
Pig farm wastewater treatment method Download PDFInfo
- Publication number
- CN110981111A CN110981111A CN201911360882.1A CN201911360882A CN110981111A CN 110981111 A CN110981111 A CN 110981111A CN 201911360882 A CN201911360882 A CN 201911360882A CN 110981111 A CN110981111 A CN 110981111A
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- China
- Prior art keywords
- wastewater
- treatment
- pig farm
- biochemical reaction
- filler
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
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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
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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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
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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
- C02F3/28—Anaerobic digestion processes
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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
Abstract
A method for treating wastewater of a pig farm comprises the following steps: anaerobic hydrolysis treatment, suspended filler biochemical reaction tank treatment and BAF treatment. Firstly, the wastewater after the solid waste is precipitated and isolated in a pig farm enters anaerobic hydrolysis treatment, then the wastewater enters a suspended filler biochemical reaction tank for aerobic/anoxic biochemical reaction, and finally the wastewater enters BAF treatment. The invention has certain advantages in the aspects of treatment depth and treatment cost, and has good application prospect.
Description
Technical Field
The invention relates to a wastewater treatment technology, in particular to a method for treating wastewater in a pig farm.
Background
Since the twenty-first century, the large-scale pig raising industry in China develops rapidly, the number of live pig stocks in a pig farm is from thousands to tens of thousands, and the discharge amount of wastewater in the pig farm is continuously increased along with the development of the large-scale pig raising industry. Pig farm waste water includes pig urine, partial pig manure and pigsty washing water, belongs to high concentration organic waste water, if directly discharges the natural water without handling, will make the water blacken smelly, causes the quality of water to worsen, and the environmental problem that pig farm pollution brought aggravates gradually, has gradually become the common bottleneck problem that restricts the development of pig industry. The anaerobic-aerobic combined process is an economic method for treating high-concentration organic wastewater, but in practical application, the effect of treating the pig farm wastewater by the anaerobic-aerobic process for treating the pig farm wastewater, such as the UASB-SBR process and the CSTR-SBR process, is not ideal, and the effect of the aerobic treatment unit on removing nitrogen from anaerobic digestion liquid is not good; and if the ammonia is chemically removed before the biochemical treatment, the cost is too high.
The invention adopts two-stage aerobic process, namely 'suspended filler biochemical reaction tank' and 'BAF' combined process to treat anaerobic effluent, wherein the 'suspended filler biochemical reaction tank' has anoxic environment and can simultaneously complete nitrification and denitrification, while the 'BAF process' has deep biodegradation and filtration functions and can further remove part of NH in wastewater3N and SS, and the effluent quality is improved.
Disclosure of Invention
The invention aims to overcome the defects of insufficient treatment depth, excessive ammonia nitrogen and high cost caused by chemical ammonia removal in the conventional pig farm wastewater treatment technology.
The invention is realized by the following technical scheme:
a method for treating wastewater of a pig farm comprises the following steps:
step one, anaerobic hydrolysis treatment: the manure-containing wastewater for washing the pig farm enters a septic tank for precipitation and solid waste isolation, and then the supernatant enters an anaerobic hydrolysis tank for treatment to obtain primary wastewater;
step two, treating the suspended filler in a biochemical reaction tank: the primary wastewater enters a suspended filler biochemical reaction tank to carry out aerobic/anoxic biochemical reaction to obtain secondary wastewater;
step three, BAF treatment: and finally, the secondary wastewater enters a BAF biological filter for treatment.
According to the invention, the elastic filler is suspended in the anaerobic hydrolysis tank, the anaerobic hydrolysis hydraulic retention time is 12-18 h, macromolecular organic matters in the wastewater are decomposed into micromolecular organic matters in the hydrolysis tank, the organic load is reduced, and organic nitrogen is also converted into ammonia nitrogen under the ammoniation effect.
In the invention, a suspension filler biochemical reaction tank adopts a wheel-shaped filler, the diameter of the filler is 2.0-3.0 cm, the thickness of the filler is 0.5-1.0 cm, the filler is suspended in the tank, and the filling rate is 30-50%; the concentration of Dissolved Oxygen (DO) in the biochemical reaction tank with the suspended filler is controlled to be 1.5-2.5 mg/L, and the Hydraulic Retention Time (HRT) is controlled to be 8-14 h.
In the invention, the BAF adopts natural zeolite as a filter material, the natural zeolite is irregular in shape and about 10-30 mm in size, and the stacking thickness of the filter material layer is 2.0-3.0 m; the concentration of Dissolved Oxygen (DO) in BAF treatment is controlled to be 2.0-3.0 mg/L, and the Hydraulic Retention Time (HRT) is controlled to be 4-6 h.
The invention has certain advantages in the aspects of treatment depth and treatment cost of wastewater in pig farms, and has good application prospect.
Detailed Description
Example (b):
anaerobic hydrolysis treatment: supernatant liquid obtained after settling and separating solid waste in a septic tank of a certain pig farm is taken to enter an anaerobic hydrolysis tank for treatment, elastic filler is suspended in the anaerobic hydrolysis tank, and the anaerobic hydrolysis hydraulic retention time is designed to be 15 hours.
Treating a suspended filler biochemical reaction tank: the anaerobic hydrolysis effluent enters a suspended filler biochemical reaction tank for aerobic/anoxic biochemical reaction, the biochemical reaction tank adopts a wheel-shaped filler, the diameter of the filler is 2.5cm, the thickness of the filler is 0.8 cm, the filler is suspended in the tank, and the filling rate is 35%. After the wastewater enters a suspended filler biochemical reaction tank, controlling the DO concentration to be 1.8-2.2 mg/L and the HRT to be 12 h.
BAF treatment: the effluent treated by the suspended filler biochemical reaction tank enters BAF for aerobic biological and filtration advanced treatment, so that residual pollutants in the wastewater are further reduced and SS is intercepted. The BAF adopts natural zeolite as a filter material, the natural zeolite is irregular in shape and about 20-25 mm in size, and the stacking thickness of the filter material layer is 2.5 m. Effluent treated by the suspended filler biochemical reaction tank enters BAF for treatment, the Dissolved Oxygen (DO) concentration of the BAF is controlled to be 2.0-2.5 mg/L, and the Hydraulic Retention Time (HRT) is controlled to be 5 h.
Application example:
the technology provided by the invention takes wastewater of a certain pig farm to carry out experimental research, the wastewater is treated according to the method of the embodiment, and the treatment results of the water sample for spot check are shown in Table 1.
Table 1 sample treatment results for spot check:
after the pig farm wastewater subjected to experimental research is treated by the patented technology, the pig farm wastewater can reach the first-level discharge standard of discharge Standard of pollutants for livestock and poultry Breeding (GB 18596-2001).
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A method for treating wastewater in a pig farm is characterized by comprising the following steps:
step one, anaerobic hydrolysis treatment: the manure-containing wastewater for washing the pig farm enters a septic tank for precipitation and solid waste isolation, and then the supernatant enters an anaerobic hydrolysis tank for treatment to obtain primary wastewater;
step two, treating the suspended filler in a biochemical reaction tank: the primary wastewater enters a suspended filler biochemical reaction tank to carry out aerobic/anoxic biochemical reaction to obtain secondary wastewater;
step three, BAF treatment: and finally, the secondary wastewater enters a BAF biological filter for treatment.
2. The method for treating wastewater in a pig farm according to claim 1, wherein in the first step, elastic filler is suspended in the anaerobic hydrolysis tank, and the anaerobic hydrolysis hydraulic retention time is 12-18 h.
3. The method for treating wastewater in a pig farm according to claim 1, wherein in the second step, the biochemical reaction tank adopts wheel-shaped filler with the diameter of 2.0-3.0 cm and the thickness of 0.5-1.0 cm, the filler is suspended in the tank, and the filling rate is 30-50%; the dissolved oxygen concentration of the biochemical reaction tank with the suspended filler is controlled to be 1.5-2.5 mg/L, and the hydraulic retention time is controlled to be 8-14 h.
4. The wastewater treatment method for the pig farm according to claim 1, characterized in that in the third step, the BAF adopts natural zeolite as a filter material, the natural zeolite is irregular in shape and 10-30 mm in size, and the stacking thickness of the filter material layer is 2.0-3.0 m; the concentration of dissolved oxygen in BAF treatment is controlled to be 2.0-3.0 mg/L, and the hydraulic retention time is controlled to be 4-6 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911360882.1A CN110981111A (en) | 2019-12-26 | 2019-12-26 | Pig farm wastewater treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911360882.1A CN110981111A (en) | 2019-12-26 | 2019-12-26 | Pig farm wastewater treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110981111A true CN110981111A (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911360882.1A Pending CN110981111A (en) | 2019-12-26 | 2019-12-26 | Pig farm wastewater treatment method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160017818A (en) * | 2014-08-06 | 2016-02-17 | 경기도 | System for advanced wastewater treatment using optimal micro-organism of pollutants and the method thereof |
| CN106145546A (en) * | 2016-08-24 | 2016-11-23 | 广东水清环保科技有限公司 | The processing method of a kind of livestock breed aquatics waste water and system thereof |
| CN106904795A (en) * | 2017-03-31 | 2017-06-30 | 沈阳环境科学研究院 | A kind of milk cattle cultivating waste water treatment process |
-
2019
- 2019-12-26 CN CN201911360882.1A patent/CN110981111A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160017818A (en) * | 2014-08-06 | 2016-02-17 | 경기도 | System for advanced wastewater treatment using optimal micro-organism of pollutants and the method thereof |
| CN106145546A (en) * | 2016-08-24 | 2016-11-23 | 广东水清环保科技有限公司 | The processing method of a kind of livestock breed aquatics waste water and system thereof |
| CN106904795A (en) * | 2017-03-31 | 2017-06-30 | 沈阳环境科学研究院 | A kind of milk cattle cultivating waste water treatment process |
Non-Patent Citations (1)
| Title |
|---|
| 赵庆良等: "《废水处理与资源化新工艺》", 31 August 2006, 中国建筑工业出版社 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200410 |
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| RJ01 | Rejection of invention patent application after publication |