CN111362404A - Solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment and preparation method thereof - Google Patents
Solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment and preparation method thereof Download PDFInfo
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- CN111362404A CN111362404A CN202010230116.XA CN202010230116A CN111362404A CN 111362404 A CN111362404 A CN 111362404A CN 202010230116 A CN202010230116 A CN 202010230116A CN 111362404 A CN111362404 A CN 111362404A
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- carbon source
- solid carbon
- nitrate nitrogen
- bamboo powder
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
Abstract
The solid carbon source suitable for treating the high-concentration nitrate nitrogen sewage comprises PBS (phosphate buffer solution), biological fermentation bamboo powder, starch, water and a silane coupling agent, wherein the parts ratio of the PBS to the biological fermentation bamboo powder to the starch to the water to the silane coupling agent is (25-65): (30-50): (6-30): 1-4): 1-6). The preparation method comprises the following steps: uniformly mixing PBS, biological fermentation bamboo powder, starch, water and a silane coupling agent in a high-speed mixer according to a predetermined ratio; step two, adding the uniformly mixed materials into a double-screw extruder, adjusting the temperature to 110-; and step three, extruding the blend by a double-screw extruder, cooling the extrudate by water, crushing and granulating by a crusher, and drying. The method reduces the production cost of the solid carbon source, improves the utilization rate of the biomass material, and avoids resource waste to the greatest extent.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment and a preparation method thereof.
Background
In the current society, with the rapid development of economic society and the improvement of living standard, the nitrogen pollution caused by human activities is more and more serious. Nitrogen pollution has become a global environmental problem and has had many adverse effects on aquatic animals and plants, human health, and ecosystem stability, among others. To minimize the adverse effects of nitrogen contamination, various new treatment techniques and processes are continually being developed and improved to accommodate increasingly stringent nitrogen emission standards. At present, the biological denitrification technology is widely used, and compared with other denitrification technologies, the biological denitrification technology has the characteristics of low cost, wide applicability, convenience in management and large-scale application.
When the total nitrogen in natural water bodies such as rivers, lakes and the like exceeds a certain concentration, eutrophication of the water bodies can be caused, the sense and the function of the water bodies are influenced, and aquatic ecology is damaged. Therefore, the sewage with high concentration nitrate nitrogen can be discharged into a receiving water body after a series of deep denitrification treatments. When the traditional biological denitrification treatment process is used for treating high-concentration nitrate nitrogen sewage, liquid carbon sources such as glucose, sodium acetate or methanol are often required to be added so as to ensure the smooth proceeding of the microbial denitrification process. In the using process of the liquid carbon source, the quality of effluent water is deteriorated due to the fact that the liquid carbon source is added insufficiently or excessively due to the fluctuation of the concentration of nitrate nitrogen in the incoming water. The solid-phase denitrification technology is a novel sewage treatment technology, is different from the traditional denitrification technology, takes solid organic matters as a carbon source and a growth carrier of denitrifying microorganisms, and the solid organic matters can be hydrolyzed into micromolecular organic substrates by the microorganisms and serve as electron donors in the denitrification process to finally reduce nitrate nitrogen into non-toxic and harmless nitrogen. When the solid-phase denitrification technology is used for treating high-concentration nitrate nitrogen sewage, an organic carbon source can be released according to the requirements of microorganisms to supply for the denitrification process, and the denitrification effect is stable. Meanwhile, the solid carbon source can provide attachment sites for microorganisms, and is beneficial to the aggregation of the microorganisms, so that the denitrification effect of unit treatment volume is improved, and the treatment time of high-concentration nitrate nitrogen sewage is shortened.
Research shows that abundant natural biomass materials in nature can be used as a solid carbon source for supplying denitrification process of microorganisms; however, lignin in natural biomass materials is not easy to utilize, and the simple biomass material carbon source is slowly released and is difficult to meet the treatment requirement of high-concentration nitrate nitrogen sewage.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment and a preparation method thereof aiming at the current situation of the prior art, so that the production cost of the solid carbon source is reduced, the utilization rate of biomass materials is improved, and the resource waste is avoided to the greatest extent.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment comprises PBS, biological fermentation bamboo powder, starch, water and a silane coupling agent, wherein the parts ratio of the PBS, the biological fermentation bamboo powder, the starch, the water and the silane coupling agent is (25-65): (30-50): (6-30): (1-4): (1-6).
In order to optimize the technical scheme, the adopted measures further comprise:
the preferable parts ratio of the PBS, the biological fermentation bamboo powder, the starch, the water and the silane coupling agent is (25-50): (35-45): (10-25): (1-3): (1-5).
The PBS is a milky elliptical high molecular polymer with a density of 1.15-1.25 g/cm3The melting point is 110-120 ℃, the crystallinity is 30-45 percent, and the molecular weight is 80000-120000.
The biological fermentation bamboo powder is 80-mesh bamboo powder after lignin and part of cellulose are removed through biological fermentation treatment.
The fermentation treatment method of the biological fermentation bamboo powder comprises the following steps: placing bamboo powder in a fermentation tank, maintaining humidity at 60-75%, pH at 6.0-6.8, fermenting at 25-30 deg.C for 3-7 days.
The starch is white powder with density of 2 g/cm3。
The silane coupling agent is one or a mixture of KH-550 and KH-570.
The PBS is replaced by PBAT, PLA or PLC; the biological fermentation bamboo powder is replaced by wood powder, straw, rice hull or kitchen waste biogas residue which is subjected to biological fermentation treatment.
A preparation method of a solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment comprises the following steps:
uniformly mixing PBS, biological fermentation bamboo powder, starch, water and a silane coupling agent in a high-speed mixer according to a predetermined ratio;
step two, adding the uniformly mixed materials into a double-screw extruder, adjusting the temperature to 110-;
and step three, extruding the blend by a double-screw extruder, cooling the extrudate by water, crushing and granulating by a crusher, and drying.
The temperature for banburying is 110-130 ℃, and the time is 5-15 min.
Firstly, carrying out biological fermentation treatment on a crushed biomass material to remove lignin and part of cellulose in the biomass material, and then blending the biomass material with a biodegradable polymer; not only improves the degradability of the carbon source in the biomass material, but also greatly reduces the production cost of the solid carbon source. Meanwhile, the preparation process of the solid carbon source is green and pollution-free, and secondary pollution is avoided.
The invention has the beneficial effects that:
1. by blending PBS, biologically fermented bamboo powder and starch, the production cost of the solid carbon source and the cost required by removing unit nitrogen are reduced, and the cost performance of the solid phase denitrification technology is improved;
2. in the preparation period of the blend, no toxic or harmful substances are used and generated, so that secondary pollution to the environment is avoided;
3. the removal of lignin and part of cellulose in the biological fermentation bamboo powder is beneficial to improving the bioavailability of the organic carbon source in the biomass material;
4. compared with single PBS or PBAT, the prepared solid carbon source has greatly improved biodegradation performance and is beneficial to improving denitrification rate.
Detailed Description
The present invention will be described in further detail with reference to examples.
A solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment comprises PBS, biological fermentation bamboo powder, starch, water and a silane coupling agent, wherein the parts ratio of the PBS, the biological fermentation bamboo powder, the starch, the water and the silane coupling agent is (25-65): (30-50): (6-30): (1-4): (1-6).
The preferable part ratio of PBS, biological fermentation bamboo powder, starch, water and silane coupling agent is (25-50): (35-45): (10-25): 1-3): 1-5).
In the examples, PBS is a milky elliptical polymer having a density of 1.15-1.25 g/cm3The melting point is 110-120 ℃, the crystallinity is 30-45 percent, and the molecular weight is 80000-120000.
In the embodiment, the biological fermentation bamboo powder is 80-mesh bamboo powder after lignin and part of cellulose are removed through biological fermentation treatment.
In the embodiment, the fermentation treatment method of the biological fermentation bamboo powder comprises the following steps: placing bamboo powder in a fermentation tank, maintaining humidity at 60-75%, pH at 6.0-6.8, fermenting at 25-30 deg.C for 3-7 days. The fermentation tank contains fungi (white rot fungi, brown rot fungi, soft rot fungi and the like) and bacteria (yeasts, actinomycetes and the like), and the biomass material is decomposed under the action of the mixed strains, so that the protection of lignin on hemicellulose and fibers is broken, and the utilization efficiency of the material is improved.
In the examples, the starch was a white powder having a density of 2 g/cm3。
In the examples, the silane coupling agent is one or a mixture of two of KH-550 and KH-570.
The PBS can be replaced by PBAT, PLA or PLC; the biological fermentation bamboo powder can be replaced by wood powder, straw, rice hull or kitchen waste biogas residue which is subjected to biological fermentation treatment.
A preparation method of a solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment comprises the following steps:
uniformly mixing PBS, biological fermentation bamboo powder, starch, water and a silane coupling agent in a high-speed mixer according to a predetermined ratio;
step two, adding the uniformly mixed materials into a double-screw extruder, adjusting the temperature to 110-; the banburying temperature is 110-130 ℃, and the banburying time is 5-15 min.
And step three, extruding the blend by a double-screw extruder, cooling the extrudate by water, crushing and granulating by a crusher, and drying.
The starting materials and reagents used in the examples are all commercially available products or can be prepared by known methods.
Example 1
Putting 30 parts of PBS, 45 parts of biological fermentation bamboo powder, 20 parts of starch, 2 parts of water and 3 parts of KH-570 into a double-screw extruder, uniformly stirring, carrying out banburying at 120 ℃ for 15 min, blending, extruding, cooling the blend to room temperature, and crushing and granulating by using a crusher.
Example 2
50 parts of PBS, 35 parts of biological fermentation bamboo powder, 10 parts of starch, 2 parts of water and 3 parts of KH-550 are put into a double-screw extruder to be uniformly stirred, the banburying temperature is 130 ℃, the time is 10 min, the mixture is blended and extruded, the blend is cooled to the room temperature, and the mixture is crushed and granulated by a crusher.
Application example 1
The treatment device comprises 3 units with volume of 8 m3The glass fiber reinforced plastic tank bodies are connected in series, and 2 m of the glass fiber reinforced plastic tank bodies are uniformly filled in the glass fiber reinforced plastic tank bodies3The biomass solid carbon source prepared in example 1. The treatment device adopts standing and film hanging, and the inoculum is secondary sedimentation tank sludge of a sewage treatment plant. Adding NaNO into the influent water3Regulating NO3 -The N concentration is 400 mg/L, the retention time is 24 h, and the water quality before and after sewage treatment is shown in Table 1:
TABLE 1 comparison of Water quality before and after treatment in the treatment apparatus
Application example 2
The treatment device comprises 3 units with volume of 8 m3The glass fiber reinforced plastic tank bodies are connected in series, and 2 m of the glass fiber reinforced plastic tank bodies are uniformly filled in the glass fiber reinforced plastic tank bodies3The biomass solid carbon source prepared in example 2. Treatment ofThe device adopts standing and film hanging, and the inoculum is secondary sedimentation tank sludge of a sewage treatment plant. Adding NaNO into the influent water3Regulating NO3 -The N concentration is 400 mg/L, the retention time is 24 h, and the water quality before and after sewage treatment is shown in Table 2:
TABLE 2 comparison of Water quality before and after treatment by the treatment apparatus
According to the treatment results of the two application examples, the solid carbon source prepared in example 2 has higher removal efficiency on the high-concentration nitrate nitrogen wastewater, which indicates that the proportion of each component of the solid carbon source in example 2 is better.
While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by one skilled in the art without departing from the scope of the invention.
Claims (10)
1. A solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment is characterized in that: the solid carbon source comprises PBS, biological fermentation bamboo powder, starch, water and a silane coupling agent, wherein the parts ratio of the PBS, the biological fermentation bamboo powder, the starch, the water and the silane coupling agent is (25-65): (30-50): (6-30): (1-4): (1-6).
2. The solid carbon source suitable for treating high-concentration nitrate nitrogen sewage as claimed in claim 1, wherein the parts ratio of PBS, biological fermentation bamboo powder, starch, water and silane coupling agent is (25-50), (35-45), (10-25), (1-3) and (1-5).
3. The solid carbon source suitable for treating high-concentration nitrate nitrogen wastewater as recited in claim 1, wherein the PBS is a milky elliptical high molecular polymer having a density of 1.15-1.25 g/cm3The melting point is 110-120 ℃, the crystallinity is 30-45 percent, and the molecular weight is 80000-120000.
4. The solid carbon source suitable for the treatment of high-concentration nitrate nitrogen wastewater as claimed in claim 1, wherein the biologically fermented bamboo powder is 80-mesh bamboo powder after removal of lignin and part of cellulose by biological fermentation treatment.
5. The solid carbon source suitable for the treatment of the high-concentration nitrate nitrogen wastewater as claimed in claim 1, wherein the fermentation treatment method of the biological fermentation bamboo powder comprises the following steps: placing bamboo powder in a fermentation tank, maintaining humidity at 60-75%, pH at 6.0-6.8, fermenting at 25-30 deg.C for 3-7 days.
6. The solid carbon source for treating high-concentration nitrate nitrogen wastewater according to claim 1, wherein the starch is white powder having a density of 2 g/cm3。
7. The solid carbon source suitable for wastewater treatment of nitrate nitrogen in high concentration as claimed in claim 1, wherein the silane coupling agent is one or a mixture of KH-550 and KH-570.
8. The solid carbon source suitable for the treatment of high-concentration nitrate nitrogen wastewater as claimed in claim 1, wherein the PBS is replaced by PBAT, PLA or PLC; the biological fermentation bamboo powder is replaced by wood powder, straw, rice hull or kitchen waste biogas residue which is subjected to biological fermentation treatment.
9. The method for preparing a solid carbon source suitable for wastewater treatment of nitrate nitrogen in high concentration as claimed in claim 1, wherein: the method comprises the following steps:
uniformly mixing PBS, biological fermentation bamboo powder, starch, water and a silane coupling agent in a high-speed mixer according to a predetermined ratio;
step two, adding the uniformly mixed materials into a double-screw extruder, adjusting the temperature to 110-;
and step three, extruding the blend by a double-screw extruder, cooling the extrudate by water, crushing and granulating by a crusher, and drying.
10. The method for preparing a solid carbon source suitable for wastewater treatment of nitrate nitrogen in high concentration as claimed in claim 9, wherein: the banburying temperature is 110-130 ℃, and the banburying time is 5-15 min.
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| CN202010230116.XA CN111362404A (en) | 2020-03-27 | 2020-03-27 | Solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115925131A (en) * | 2022-12-16 | 2023-04-07 | 宁夏水投清水源水处理科技有限公司 | Composite carbon source and production process thereof |
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