CN108101221B - Method for controlling and recovering constructed wetland filler biological blockage - Google Patents
Method for controlling and recovering constructed wetland filler biological blockage Download PDFInfo
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- CN108101221B CN108101221B CN201711446566.7A CN201711446566A CN108101221B CN 108101221 B CN108101221 B CN 108101221B CN 201711446566 A CN201711446566 A CN 201711446566A CN 108101221 B CN108101221 B CN 108101221B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000000945 filler Substances 0.000 title claims abstract description 27
- 102000004190 Enzymes Human genes 0.000 claims abstract description 32
- 108090000790 Enzymes Proteins 0.000 claims abstract description 32
- 229920001282 polysaccharide Polymers 0.000 claims abstract description 23
- 239000005017 polysaccharide Substances 0.000 claims abstract description 23
- 150000004676 glycans Chemical class 0.000 claims abstract description 22
- 101710130006 Beta-glucanase Proteins 0.000 claims abstract description 11
- 108091005658 Basic proteases Proteins 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000035699 permeability Effects 0.000 description 15
- 230000000694 effects Effects 0.000 description 13
- 230000000903 blocking effect Effects 0.000 description 8
- 239000011148 porous material Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- 238000005273 aeration Methods 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000003876 biosurfactant Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 108090000604 Hydrolases Proteins 0.000 description 1
- 102000004157 Hydrolases Human genes 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 241001233061 earthworms Species 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007515 enzymatic degradation Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 102000039446 nucleic acids Human genes 0.000 description 1
- 108020004707 nucleic acids Proteins 0.000 description 1
- 150000007523 nucleic acids Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polysaccharide compound Chemical class 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 231100001234 toxic pollutant Toxicity 0.000 description 1
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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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/342—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the enzymes used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- 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
- C02F2303/14—Maintenance of water treatment installations
-
- 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
- C02F2303/20—Prevention of biofouling
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Enzymes And Modification Thereof (AREA)
Abstract
The invention discloses a method for controlling and recovering constructed wetland filler biological blockage, which comprises the following steps of (1) preparing a polysaccharide enzyme solution, wherein α -glucohydrolase, β -glucanase and alkaline protease are respectively prepared according to the proportion of 3-5: 1-3, and (2) adding the polysaccharide enzyme solution prepared in the step (1) into the constructed wetland, wherein the adding concentration is 10-25 mg/l.
Description
Technical Field
The invention relates to the technical field of constructed wetland anti-blocking, in particular to a method for controlling and recovering constructed wetland filler biological blocking.
Background
The artificial wetland is a novel sewage treatment technology developed in recent decades, combines the characteristics of sewage treatment of natural wetland, and treats pollutants by means of physical interception, biodegradation and the like of a natural ecosystem, so that the water quality is improved. However, according to more than 100 artificial wetlands put into use by US EPA (US EPA), about half of the artificial wetlands have been found to cause various clogging phenomena within 5 years of operation. Some constructed wetlands built in the early stage of China also generate blockage to different degrees. The wetland blocking process is a process that effective pores in wetland fillers are reduced and the permeability coefficient is gradually reduced, and the process can cause the problems of shortened hydraulic retention time, surface flow, short flow and the like, so that the purification capacity of the wetland is seriously reduced, and even phenomena of water accumulation, stink and the like occur, and the surrounding ecological environment is influenced.
The existing blockage prevention and control measures mainly comprise two types, namely a blockage prevention measure, which aims to delay or reduce the blockage of the wetland as much as possible; and secondly, a recovery means is adopted to recover the wetland to the state before blockage, so that normal operation is realized. The preventive measures generally include appropriate management measures, hydraulic load control, influent water pretreatment, or changing the operating conditions of the wetland. The recovery means can be mainly divided into the replacement of contaminated fillers; digging out, cleaning and recycling the polluted filler; directly adding an oxidant into the filler; and bioremediation methods and the like. The researches of Platzer and the like find that most of organic matters accumulated in the wetland are concentrated on the surface layer during the operation of the wetland, the blockage mainly occurs at the upper layer of 0-15 cm, and the substrate of the wetland system, especially the surface layer filler, is replaced regularly, so that the blockage of the surface layer of the wetland can be effectively prevented, and the continuous and stable operation of the artificial wetland is ensured. The Batchelor and the like apply intermittent operation and alternate rest methods in an actual horizontal subsurface flow constructed wetland, and the results show that the blocking substances on the surface of the wetland are reduced, and the permeability coefficient of the wetland is recovered to a certain degree. The Hua and the like add HCl, NaOH and NaClO into the vertical flow wetland respectively through simulation tests to remove blocking substances, and as a result, 15%, 18% and 23% of effective pore spaces of the substrate are recovered respectively, and a better treatment effect is achieved. Mullingan and the like research the influence of the biosurfactant on the soil organic pollution remediation, and find that the biosurfactant can improve the degradation effectiveness of organisms on low-concentration toxic pollutants. Li et al used a novel wetland plugging recovery method: the micro animals such as earthworms and the like are added to clear the matrix and remove organic sediments on the surface of the matrix, thereby recovering the hydraulic conductivity of the artificial wetland matrix.
However, the methods such as replacing the filler and adding the oxidizing agent are expensive, and the safety of the treatment is affected. The alternate operation is that the continuous flow artificial wetland influences the continuous operation of the artificial wetland device by periodically stopping water inflow.
In order to solve the problems, researchers propose an enzymolysis mode to block the wetland, and a patent document with the publication number of CN 103387291B discloses an artificial wetland blocking method, wherein β -glucanase is added after a reactor is operated for enzymolysis, the enzymolysis time is 48-60 hours, the enzymolysis conditions are that the temperature is 38-40 ℃, the pH is 6.0-6.5, the enzyme adding amount of the enzymolysis is 0.8-1.6 mg/mL, and the auxiliary aeration amount of the enzymolysis is 1.5-3 m3/(m2D) the artificial wetland is a vertical flow artificial wetland, a subsurface flow artificial wetland or a composite flow artificial wetland, and the invention adds β -glucanase for enzymolysis and auxiliary aeration (the aeration rate is 1.5-3 m)3/(m2D)) process, not only can efficiently degrade the extracellular polysaccharide to achieve the purpose of inhibiting wetland blockage, but also can effectively maintain the ecological environment and functions of the system, thereby having good adaptability and practicability. The invention can maintain or even improve the treatment of pollutants by the system while inhibiting blockageEfficiency.
However, the method has the advantages of single enzyme type, large dosage, assistance by improving aeration quantity, complex operation, unsatisfactory recovery condition of porosity and important importance in finding a simpler and more effective blockage inhibiting method.
Disclosure of Invention
The invention discloses a method for controlling and recovering biological blockage of constructed wetland filler, which is simple and effective in use, can increase pores in the filler, improve and recover permeability coefficient, and avoid failure of the constructed wetland caused by blockage of filler particles by a biological membrane.
A method for controlling and recovering constructed wetland filler biological blockage comprises the following steps:
(1) preparing a polysaccharide enzyme solution, wherein α -glucose hydrolase, β -glucanase and alkaline protease are prepared according to the proportion of 3-5: 1-3 respectively;
(2) and (2) adding the polysaccharide enzyme solution prepared in the step (1) into the constructed wetland, wherein the adding concentration is 10-25 mg/l.
According to the invention, the polysaccharide combined enzyme is added on the surface layer of the vertical flow artificial wetland or the polysaccharide compound enzyme is added on the water inlet side of the horizontal undercurrent artificial wetland, a high-concentration enzyme solution enters the filler layer along with the seepage of inlet water, extracellular polymers secreted by microorganisms are decomposed under the action of enzyme catalysis, and the blocked pore channel is opened, so that the permeability coefficient is improved, and the blocking problem is solved.
The biological blocking substance in the filler is mainly extracellular polymer generated by microorganisms, and the main components of the biological blocking substance are polysaccharide, protein and nucleic acid, therefore, a combined enzyme suspension solution after being uniformly stirred is added into artificial wetland water inlet facilities such as a water distribution tank, a water inlet pipe and the like, the adding concentration in water can be about 10-25 mg/l according to different purposes, the low value can be taken mainly for preventing and controlling blockage, and the permeability coefficient is returned to the high value mainly after blockage.
Along with the reduction of polysaccharide substances, transparent colloidal objects blocked in pores are decomposed and crushed, water flow seepage pore channels are opened, the porosity is partially recovered, so that the permeability coefficient is gradually recovered, after the combined enzyme is added, the permeability coefficient is gradually recovered to be more than 10 times of the initial state in about 30 days in the subsequent operation period, and the artificial wetland can be recovered to be normally operated.
It is noted that, after the combined enzyme is added, the removal rate of the COD in the wetland is increased from the initial 20 percent to more than 35 percent, which has a positive effect on the treatment effect.
In the normal running process of the wetland, in order to prevent blockage in the running process, the combined enzyme can be properly added at intervals to prevent the blockage.
In order to improve the enzyme catalysis effect in the method, the method preferably further comprises the step (3) of reducing the hydraulic load or stopping water supply for more than 24 hours after the inside of the filler of the artificial wetland is completely the polysaccharide enzyme solution with the concentration of 10-25 mg/l.
In order to improve the enzyme catalysis effect in the method, preferably, in the step (3), the hydraulic load is 0.001-2 m3/(m3.d)。
Preferably, when the wetland bed porosity of the constructed wetland to be treated is 12 to 18 percent, the α -glucohydrolase, β -glucanase and alkaline protease in the step (1) are respectively configured in a ratio of 3 to 4.5:4.5 to 5:1, and when the constructed wetland is blocked, the polysaccharide-combined enzyme in the ratio is better in treatment effect.
Preferably, when the wetland bed porosity of the artificial wetland to be treated is 18-25%, the α -glucohydrolase, β -glucanase and alkaline protease in the step (1) are respectively configured in a ratio of 4-5: 3-4: 2-3, and when the artificial wetland needs anti-blocking control, the polysaccharide-combined enzyme treatment effect is better according to the ratio.
Preferably, when the porosity of the wetland bed of the artificial wetland to be treated is 12-18%, the adding concentration in the step (2) is 20-25 mg/l. When the constructed wetland is blocked, the treatment effect is better according to the adding concentration.
Preferably, when the porosity of the wetland bed of the artificial wetland to be treated is 18-25%, the adding concentration in the step (2) is 10-15 mg/l. When the anti-blocking control is needed to be carried out on the artificial wetland, the treatment effect is better according to the adding concentration.
The invention has the beneficial effects that:
the method for controlling and recovering the biological blockage of the filler of the artificial wetland is safer for the environment and the adding personnel, does not damage the internal ecosystem of the wetland, does not influence the effluent purification effect, has less adding dosage, low cost, good effect and quick response, and can recover the permeability coefficient by more than 10 times.
Drawings
FIG. 1 is a graph showing the change in permeability coefficient recovery and COD treatment rate after addition of a polysaccharide enzyme by the method of example 1.
Fig. 2 is a graph showing the change in the porosity of the constructed wetland after the enzyme combination addition was performed by the method of example 1.
Fig. 3 is a graph showing changes in the content of polysaccharides in the plugs in the packing of the constructed wetlands after the enzyme combination addition was performed by the method of example 1.
Detailed Description
Example 1
In the embodiment, the constructed wetland is treated with the initial porosity of 20.9 percent and the permeability coefficient of 1.134 cm/s.
The method for controlling and recovering the artificial wetland filler biological blockage comprises the following steps:
(1) preparing polysaccharide enzyme solution, wherein α -glucohydrolase, β -glucanase and alkaline protease are prepared in a ratio of 5:5:2 respectively;
(2) and (2) adding the polysaccharide enzyme solution prepared in the step (1) into the artificial wetland, wherein the adding concentration is 20 mg/l.
(3) After the inside of the filler of the artificial wetland is completely polysaccharide enzyme solution with the concentration of 20mg/l, the hydraulic load is reduced by more than 60 percent for 24 hours.
As shown in fig. 1, after the treatment by the method of the embodiment, the COD removal rate of the constructed wetland is increased from the initial 20% to 35% or more, which has a positive effect on the treatment effect and improves and recovers the permeability coefficient.
After the method of the embodiment is used, transparent colloidal objects blocked in pores are decomposed and crushed along with the reduction of polysaccharide substances, water flow seepage pore channels are opened, the porosity is partially recovered, as shown in fig. 2, so that the permeability coefficient is gradually recovered, after the combined enzyme is added, the permeability coefficient is gradually recovered to be more than 10 times of the initial state in about 30 days in the subsequent operation period, and the artificial wetland can be recovered to be in normal operation.
As shown in FIG. 3, the content of polysaccharides in the biofilm gradually decreased due to the enzymatic degradation.
Example 2
In the embodiment, the treatment is carried out on the vertical flow artificial wetland with the initial porosity of 25.6 percent and the initial permeability coefficient of 2.92 cm/s.
The method for controlling and recovering the artificial wetland filler biological blockage comprises the following steps:
(1) preparing polysaccharide enzyme solution, wherein α -glucohydrolase, β -glucanase and alkaline protease are prepared in a ratio of 4:5:1 respectively;
(2) and (2) adding the polysaccharide enzyme solution prepared in the step (1) into the artificial wetland, wherein the adding concentration is 20 mg/l.
(3) After the inside of the filler of the artificial wetland is completely polysaccharide enzyme solution with the concentration of 22mg/l, the hydraulic load is reduced by more than 60 percent for 24 hours.
In summary, the method for controlling and recovering the biological blockage of the filler of the artificial wetland is safe for the environment and the feeding personnel, does not damage the internal ecosystem of the wetland, does not influence the effluent purification effect, has the advantages of small feeding dosage, low cost, good effect, quick response and capability of recovering the permeability coefficient by more than 10 times.
Claims (4)
1. A method for controlling and recovering constructed wetland filler biological blockage is characterized by comprising the following steps:
(1) preparing a polysaccharide enzyme solution, wherein α -glucohydrolase, β -glucanase and alkaline protease are prepared according to the ratio of 3-5: 1-3 respectively, when the porosity of a wet land bed of the artificial wetland to be treated is 12-18%, α -glucohydrolase, β -glucanase and alkaline protease in the step (1) are prepared according to the ratio of 3-4.5: 4.5-5: 1 respectively, when the porosity of the wet land bed of the artificial wetland to be treated is 18-25%, α -glucohydrolase, β -glucanase and alkaline protease in the step (1) are prepared according to the ratio of 4-5: 3-4: 2-3 respectively;
(2) adding the polysaccharide enzyme solution prepared in the step (1) into an artificial wetland, wherein the adding concentration is 10-25 mg/l;
(3) after the inside of the filler of the artificial wetland is completely polysaccharide enzyme solution with the concentration of 10-25 mg/l, reducing the hydraulic load or stopping water supply for more than 24 hours.
2. The method for controlling and recovering the biological stuffing blockage of the artificial wetland according to claim 1, wherein in the step (3), the hydraulic load is 0.001-2 m3/(m3.d)。
3. The method for controlling and recovering the biological clogging of the artificial wetland filler according to claim 1, wherein when the porosity of the wetland bed of the artificial wetland to be treated is 12-18%, the adding concentration in the step (2) is 20-25 mg/l.
4. The method for controlling and recovering the biological clogging of the artificial wetland filler according to claim 1, wherein when the porosity of the wetland bed of the artificial wetland to be treated is 18-25%, the adding concentration in the step (2) is 10-15 mg/l.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711446566.7A CN108101221B (en) | 2017-12-27 | 2017-12-27 | Method for controlling and recovering constructed wetland filler biological blockage |
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| CN201711446566.7A CN108101221B (en) | 2017-12-27 | 2017-12-27 | Method for controlling and recovering constructed wetland filler biological blockage |
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| CN108101221B true CN108101221B (en) | 2020-05-22 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387291A (en) * | 2013-07-12 | 2013-11-13 | 河海大学 | Blocking restrain method for constructed wetland |
| CN106840738A (en) * | 2017-03-01 | 2017-06-13 | 中国科学院水生生物研究所 | A kind of artificial swamp matrix sample is in situ to be collected and parameter monitoring method and device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387291A (en) * | 2013-07-12 | 2013-11-13 | 河海大学 | Blocking restrain method for constructed wetland |
| CN106840738A (en) * | 2017-03-01 | 2017-06-13 | 中国科学院水生生物研究所 | A kind of artificial swamp matrix sample is in situ to be collected and parameter monitoring method and device |
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