CN113943087A - Treatment method of high-salinity high-phosphorus high-ammonia nitrogen organic wastewater - Google Patents
Treatment method of high-salinity high-phosphorus high-ammonia nitrogen organic wastewater Download PDFInfo
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- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
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- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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- 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
- C02F3/308—Biological phosphorus removal
Abstract
The invention relates to a method for treating high-salinity high-phosphorus high-ammonia nitrogen organic wastewater, which mainly aims at the wastewater containing a large amount of organic macromolecules such as protein, fat and the like under high salinity, combines the means of air flotation impurity removal, biological nitrification, denitrification and the like to fully decompose organic substances in the wastewater, has low process difficulty and simple and convenient operation, has unit treatment cost only being 1/3-6/1 of an electrochemical or advanced oxidation treatment scheme, and has low operation cost and good economic benefit.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment method of high-salinity high-phosphorus high-ammonia nitrogen organic wastewater.
Background
At present, organic polluted wastewater containing macromolecular organic matters such as protein, fat and the like is difficult to treat under high salinity, the sewage treatment can only meet municipal administration standards or the first-class B standard in the pollutant discharge standard of urban sewage plants (GB 18918-2002), and a treatment scheme for achieving the effluent reaching the three water quality standards of the surface is rare.
Therefore, a novel high-salinity high-ammonia nitrogen organic wastewater treatment method is provided, which is mainly designed for wastewater polluted by large organic matters containing a large amount of protein, fat and the like under high salinity, so that the final effluent reaches the standard of surface three water and even higher standard.
Disclosure of Invention
The invention aims to provide a method for treating high-salinity, high-phosphorus and high-ammonia nitrogen organic wastewater, and overcomes the defects of the existing sewage treatment scheme.
The technical scheme adopted by the invention for solving the technical problems is as follows: a treatment method of high-salinity high-phosphorus high-ammonia nitrogen organic wastewater comprises the following treatment steps:
1) firstly, pretreating wastewater, removing oil in the wastewater by using an oil-water separation device, removing large-particle suspended matters and floating matters in the oil-removed wastewater by passing the oil-removed wastewater through a grating, and then introducing the oil-removed wastewater into an adjusting tank for standing;
2) introducing the pretreated wastewater into an air floatation device, so that the micro bubbles are adhered to suspended particles in the wastewater and then float on the water surface, and removing fine suspended matters and grease in the wastewater;
3) introducing the wastewater subjected to air floatation treatment into an integrated treatment device for macromolecular degradation, nitration, precipitation and filtration;
4) mixing the integrally treated wastewater with a carbon source, introducing the mixture into an integrated filter tank, performing denitrification and biological aerated filtration to remove total nitrogen in the wastewater and reduce CODcr index of the wastewater;
5) introducing the wastewater subjected to denitrification and aeration into a filtering tank, filtering, precipitating, and allowing supernatant after precipitation to flow into a clean water tank;
6) and (4) carrying out index detection on the wastewater in the clean water tank, and discharging the wastewater after reaching the standard.
Preferably, the nitrifying step is to convert ammonia nitrogen in the wastewater into nitrate nitrogen and nitrite nitrogen using the acclimatized nitrifying bacteria.
Preferably, the carbon source is one or more of methanol, sodium acetate, sugars and sludge hydrolysis supernatant.
Preferably, the filtering tank filters the wastewater through soft fillers and activated carbon.
Preferably, the discharge index standard of the clean water tank is that total nitrogen TN is less than or equal to 1mg/L, CODcr and less than or equal to 20 mg/L:
meanwhile, the integrated treatment device in the treatment method comprises a hydrolysis acidification tank, wherein a wastewater input port is arranged on the hydrolysis acidification tank; the hydrolysis acidification tank is sequentially connected with the anoxic tank, the three-phase biological fluidized bed and the Lameira sedimentation tank; an air pump is arranged in the three-phase biological fluidized bed;
the integrated filter comprises a denitrification filter and an aeration biological filter which are separated by a partition plate; a water inlet is formed in the top of one side of the denitrification filter tank, and a water outlet is formed in the top of one side of the aeration biological filter tank; an air pump is arranged in the biological aerated filter.
Preferably, a biological filter membrane is arranged in the cymela sedimentation tank.
Preferably, a biological filter material is arranged in the biological aerated filter.
The invention has the following beneficial effects: the high-salinity high-phosphorus high-ammonia nitrogen wastewater is treated by combining a biological and chemical mode, an electrochemical mode and an advanced oxidation mode are not needed, the unit wastewater treatment cost is greatly reduced, and the economic benefit is good. The innovative integrated treatment device and the filter tank are adopted to integrate the treatment steps, so that the treatment efficiency is improved; and the treatment equipment is common standard equipment, so that the cost for facility reconstruction is low.
Drawings
FIG. 1 is a flow diagram of the wastewater treatment of the present invention;
FIG. 2 is a schematic structural view of an integrated treatment apparatus;
FIG. 3 is a schematic structural diagram of an integrated filter tank;
in the figure: 1-a waste water input port; 2-a hydrolysis acidification tank; 3-an anoxic tank; 4-three-phase biological fluidized bed; 5-lanmaila sedimentation tank; 6, an air pump; 7-a water inlet; 8-denitrification filter; 9-aeration biological filter; 10-a water outlet; 11-a separator; 12-a filler; 13-biological filter material.
Detailed Description
The following specific examples further illustrate the invention in detail.
The main pollution of the wastewater to be treated is as follows: TDS is approximately equal to 35000mg/L, ammonia nitrogen is less than or equal to 180mg/L, CODcr and less than or equal to 400mg/L, SS and less than or equal to 500mg/L, and oils are less than or equal to 80mg/L, TN and less than or equal to 260mg/L, TP and less than or equal to 50 mg/L.
As shown in figure 1, the method for treating the high-salinity high-phosphorus high-ammonia nitrogen organic wastewater comprises the following treatment steps:
1) firstly, pretreating wastewater, removing oil in the wastewater by using an oil-water separation device, removing large-particle suspended matters and floating matters in the oil-removed wastewater by passing through a grating, and then introducing into an adjusting tank for standing;
2) introducing the pretreated wastewater into an air floatation device, so that the micro bubbles are adhered to suspended particles in the wastewater and then float on the water surface, and removing fine suspended matters and grease in the wastewater;
3) introducing the wastewater subjected to air floatation treatment into an integrated treatment device shown in figure 2, wherein the integrated treatment device is formed by sequentially connecting a hydrolysis acidification tank 2, an anoxic tank 3, a three-phase biological fluidized bed 4 and a Lameira sedimentation tank 5, and one side of the hydrolysis acidification tank 2 is provided with a wastewater input port 1; an air pump 6 is arranged in the three-phase biological fluidized bed 4. The method comprises the following steps that waste water flows into a hydrolysis acidification tank from a waste water input port 1, the reaction time is 8 hours, and organic macromolecules in the waste water are degraded into micromolecules through hydrolysis acidification reaction; then introducing nitrifying bacteria into the wastewater in an anoxic pond to nitrify the wastewater, wherein the reaction time is 6 hours, then introducing the wastewater into a three-phase biological fluidized bed 4, simultaneously starting an air pump 6 to introduce air, fully contacting the wastewater with air, completing the nitrification reaction, and converting ammonia nitrogen in the wastewater into nitric acid nitrogen and nitrous acid nitrogen, wherein the reaction time is 6 hours; and finally, the effluent enters a Lameira sedimentation tank 5 for sedimentation for 8 hours, and is filtered by using a biological filter membrane.
4) Mixing the wastewater treated by the integrated treatment device with carbon sources such as methanol, sodium acetate, saccharides and sludge hydrolysis supernatant, and introducing into an integrated filter tank shown in figure 3, wherein the integrated filter tank comprises a denitrification filter tank 8 and an aeration biological filter tank 9, and the two tanks are separated by a partition plate 1; the upper part of one side of the denitrification filter 8 is provided with a water inlet 7, and the inside of the denitrification filter is filled with a filler 12; the upper part of one side of the biological aerated filter 9 is provided with a water outlet 10, and biological filter materials are filled in the biological aerated filter; an air pump 6 is arranged in the biological aerated filter 9 and is connected with the bottom of the biological aerated filter 9 through a pipeline. The wastewater added with the carbon source enters a denitrification filter 8 through a water inlet 7, flows into the bottom together with the upper part of the filler 12, and reacts for 6 hours to realize denitrification under the anoxic condition and reduce the total nitrogen in the wastewater; then the wastewater flows into the aeration biological filter, is mixed with air pumped by the air pump 6 from the bottom, and simultaneously reacts with the biological filter material to further remove organic matters, the reaction time is 4h, and the CODcr of the wastewater is reduced.
5) Introducing the wastewater subjected to denitrification and aeration into a filtering tank, wherein soft filler and activated carbon are arranged in the filtering tank to filter the wastewater; filtering, precipitating, and allowing supernatant to flow into a clean water tank;
6) and (4) carrying out index detection on the wastewater in the clean water tank, and discharging the wastewater after reaching the standard.
Table 1 shows the comparison of the water quality of inlet and outlet water
TABLE 1
| Ammonia nitrogen (mg/L) | CODcr(mg/L) | SS(mg/L) | Oils (mg/L) | TN(mg/L) | TP(mg/L) | |
| Inflow water | ≦180 | ≦400 | ≦500 | ≦80 | ≦260 | ≦50 |
| Discharging water | ≦1 | ≦20 | ≦20 | ≦3 | ≦1 | ≦0.5 |
The data in the table show that the sewage treatment method can effectively reduce the total nitrogen and total phosphorus in the wastewater, and the sewage is treated by adopting a biological method, a physical method and a chemical method, so that the process difficulty is low, the operation is simple and convenient, the unit treatment cost is only 1/3-6/1 of an electrochemical or advanced oxidation treatment scheme, the operation cost is low, and the economic benefit is good.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (8)
1. A method for treating high-salinity high-phosphorus high-ammonia nitrogen organic wastewater is characterized by comprising the following steps: the method comprises the following processing steps:
1) firstly, pretreating wastewater, removing oil in the wastewater by using an oil-water separation device, removing large-particle suspended matters and floating matters in the oil-removed wastewater by passing the oil-removed wastewater through a grating, and then introducing the oil-removed wastewater into an adjusting tank for standing;
2) introducing the pretreated wastewater into an air floatation device, so that the micro bubbles are adhered to suspended particles in the wastewater and then float on the water surface, and removing fine suspended matters and grease in the wastewater;
3) introducing the wastewater subjected to air floatation treatment into an integrated treatment device for macromolecular degradation, nitration, precipitation and filtration;
4) mixing the integrally treated wastewater with a carbon source, introducing the mixture into an integrated filter tank, performing denitrification and biological aerated filtration to remove total nitrogen in the wastewater and reduce CODcr index of the wastewater;
5) introducing the wastewater subjected to denitrification and aeration into a filtering tank, filtering, precipitating, and allowing supernatant after precipitation to flow into a clean water tank;
6) and (4) carrying out index detection on the wastewater in the clean water tank, and discharging the wastewater after reaching the standard.
2. The method for treating high-salinity high-phosphorus high-ammonia nitrogen organic wastewater according to claim 1, characterized by comprising the following steps: and in the nitrifying step, the domesticated nitrifying bacteria flora are used for converting ammonium nitrogen in the wastewater into nitrate nitrogen and nitrite nitrogen.
3. The method for treating high-salinity high-phosphorus high-ammonia nitrogen organic wastewater according to claim 1, characterized by comprising the following steps: the carbon source is one or more of methanol, sodium acetate, saccharides and sludge hydrolysis supernatant.
4. The method for treating high-salinity high-phosphorus high-ammonia nitrogen organic wastewater according to claim 1, characterized by comprising the following steps: the filtering tank filters the wastewater through soft filler and activated carbon.
5. The method for treating high-salinity high-phosphorus high-ammonia nitrogen organic wastewater according to claim 1, characterized by comprising the following steps: the discharge index standard of the clean water tank is that total nitrogen TN is less than or equal to 1mg/L, CODcr and less than or equal to 20 mg/L.
6. The integrated treatment device and integrated filter according to claim 1, wherein: the integrated treatment device comprises a hydrolysis acidification tank, wherein a wastewater input port is arranged on the hydrolysis acidification tank; the hydrolysis acidification tank is sequentially connected with the anoxic tank, the three-phase biological fluidized bed and the Lameira sedimentation tank; an air pump is arranged in the three-phase biological fluidized bed;
the integrated filter comprises a denitrification filter and an aeration biological filter which are separated by a partition plate; a water inlet is formed in the top of one side of the denitrification filter tank, and a water outlet is formed in the top of one side of the aeration biological filter tank; an air pump is arranged in the biological aerated filter.
7. The integrated treatment device and integrated filter according to claim 6, wherein: and a biological filter membrane is arranged in the cymela sedimentation tank.
8. The integrated treatment device and integrated filter according to claim 6, wherein: and a biological filter material is arranged in the biological aerated filter.
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