CN104828946A - Biocatalysis packing subsurface infiltration system for enhancing denitrification - Google Patents
Biocatalysis packing subsurface infiltration system for enhancing denitrification Download PDFInfo
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- CN104828946A CN104828946A CN201510258381.8A CN201510258381A CN104828946A CN 104828946 A CN104828946 A CN 104828946A CN 201510258381 A CN201510258381 A CN 201510258381A CN 104828946 A CN104828946 A CN 104828946A
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Abstract
The invention discloses a biocatalysis packing subsurface infiltration system for enhancing denitrification. The biocatalysis packing subsurface infiltration system comprises an aerobic system, an anaerobic system, a water feed system, a water discharge system and a micro-aeration system, wherein the aerobic system is arranged at the upper part of the biocatalysis packing subsurface infiltration system; the anaerobic system is arranged at the lower part of the biocatalysis packing subsurface infiltration system; a covering layer is arranged on the aerobic system; and the aerobic system comprises a gravel layer a, a primary filtering layer, a composite soil layer a and a zeolite layer which are arranged in sequence from top to bottom. The invention discloses a novel biocatalysis packing which integrates the functions of a microbial agent, a slow-release carbon source, catalytic denitrification, phosphorus removal and the like, and can be used for greatly enhancing the nitrogen and phosphorus removal capability of the system. An impervious layer is arranged in the biocatalysis packing subsurface infiltration system so that the aerobic system and the anaerobic system are independent relatively. The damage of an anaerobic environment for denitrification can be avoided during micro-aeration of the aerobic system so as to guarantee the superior total nitrogen removal effect of the system.
Description
Technical field
The invention belongs to decentralized type sewage process field, disclose a kind of intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system.Be made up of aerobic system, anaerobic system, water inlet system, outlet system and micro-aerating system.Top is aerobic system, is followed successively by gravel bed, first filter layer, composite earth layer a, zeolite layer from top to bottom.Lower anaerobic system is compound hydraulic flow state, is divided into three modules according to water (flow) direction, is respectively biocatalysis filler, composite earth layer b, gravel bed.The present invention, by relatively independent anaerobic system and biocatalysis filler-reinforced denitrification stage, improves the removal ability of system to total nitrogen, does not need additional carbon and layering water inlet, have structure simple, processing power is strong, not easily blocks, Construction and operation cost is low, without advantages such as mosquitos and flies stinks.
Technical background
China's town sewage focuses on technology and is tending towards ripe, and wastewater treatment rate can reach more than 80%, and this depends on costly network of drains construction.And being positioned at the area that the more remote network of drains such as suburb, cities and towns, rural area, Scenic Spot Area, Expressway Service do not cover, the discharge of its sanitary sewage becomes the important factor of water environment pollution.The biologic treating technique that sewage work commonly uses is as A
2the technique such as/O, oxidation ditch, often investment large, consume energy high, need special messenger's maintenance management, be not suitable on a small scale, distributed sewage disposal.
Subsurface wastewater infiltration system is a kind of ecological engineering technology being applicable to decentralized type sewage process, and sewage, under the acting in conjunction of soil-microorganism, is purified by processes such as physical adsorption, chemical precipitation, microbiological deteriorations.Subsurface infiltration technology has capital construction and working cost is low, almost maintenance-free advantage, and whole system is embedded in underground, without mosquitos and flies stink, does not affect the using function on ground, and the insulation effect of soil layer makes system in the winter time also can steady running.But because traditional many employings of subsurface infiltration technology are based on soil and the packing layer of sand, have that processing load is low, low, the susceptible to plugging problem of TN clearance.
Publication number is the mode that the patent of invention of CN104193084A was intake by the multistage, for denitrification provides carbon source, thus improves nitric efficiency.But when system bottom enters raw waste water, because denitrification is anaerobic environment, the nitrification of ammonia nitrogen in sewage is restricted, and water outlet ammonia nitrogen concentration may be caused higher.Publication number is the mode of aeration bottom the patent of invention of CN101284699A adopts, although the system that improves is to organism processing load, enhance system anti-clogging plug ability, but effluent nitrate-nitrogen content is high, increase aeration and virtually destroy anaerobic environment, inhibit denitrification, make the clearance of system to total nitrogen lower.
In a word, although although at present subsurface infiltration technology take forced aeration and stage by stage the measure such as water inlet improve the processing load of system, but be still difficult to improve to total nitrogen removal efficiency, main because denitrification is suppressed, probably there is the reason of the following aspects: (1) carbon source is not enough; (2) anaerobic environment is lacked; (3) denitrifying bacteria quantity not sufficient.
Summary of the invention
The technical problem to be solved in the present invention is that subsurface infiltration technology is difficult to improve to nitrogen removal rate, the present invention is by improving filler, develop a kind of biocatalysis filler, filler is not only containing a large amount of denitrification flora, and can constantly discharge carbon source needed for denitrification, simultaneously can also the carrying out of catalytic reduction reaction, improve processing load, anti-clogging plug, reduces energy consumption.The present invention by improvement to subsurface wastewater infiltration system, make aerobic system and anaerobic system relatively independent, ensure that the anaerobic environment needed for denitrification.
Technical scheme of the present invention is: a kind of intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system, described biocatalysis filler subsurface wastewater infiltration system is by aerobic system, anaerobic system, water inlet system, outlet system and micro-aerating system composition, the top of biocatalysis filler subsurface wastewater infiltration system is aerobic system, bottom is anaerobic system, aerobic system is provided with tectum, aerobic system is followed successively by gravel bed a from top to bottom, first filter layer, composite earth layer a, zeolite layer, anaerobic system is followed successively by biocatalysis packing layer from feed-water end to discharge ends horizontal direction, composite earth layer b, gravel bed b, water inlet system is made up of the perforated pipe being evenly arranged on gravel bed a, outlet system is located at the top of gravel bed b, micro-aerating system 12 is located in zeolite layer.
Described aerobic system and anaerobic system are separated by watertight layer, make aerobic system and anaerobic system relatively independent, ensure anaerobic environment needed for denitrification.
Described gravel bed a is that 5-20mm gravel forms by particle diameter, and the thickness of gravel bed a is 10-15cm, and described water inlet system is by being evenly laid in gravel bed perforated pipe; Described first filter layer is that 0.5-2mm coarse sand forms by particle diameter, and the thickness of first filter layer is 10-15cm.
Described composite earth layer a by slag and in-situ soil by volume 1:1 mix, the thickness of composite earth layer a is 30-50cm.
The zeolite that described zeolite layer is 5-15mm by particle diameter forms.
The thickness of described anaerobic system in the vertical direction is 20-40cm, the width of horizontal direction in anaerobic system, and the width of biocatalysis packing layer is 0.5-5m, the width of composite earth layer b is 0.5-5m, the width of gravel bed b is 0.2-0.5m.
Described biocatalysis packing layer is mixed by active sludge, chicken manure, stalk or rice husk, slag, iron filings and in-situ soil, and volume fraction is: active sludge 1-3%, human and animal excreta 1-3%, rice husk 1-10%, slag 20-40%, iron filings 0.5-3%, surplus are in-situ soil.
Current in described biocatalysis packing layer flow into composite earth layer b, and in composite earth layer b, current flow into gravel bed b.
Described biocatalysis filler subsurface wastewater infiltration system alternation of wetting and drying runs, and psychrometric ratio is 6:1-2:1, and every day intakes 3-6 time, after each water inlet 0.5-1h, starts micro-aerating system 0.5-2h.
The thickness of described biocatalysis filler subsurface wastewater infiltration system is 20-40cm.
The invention has the beneficial effects as follows:
(1) this invention exploits a kind of novel biocatalysis filler, integrate the several functions such as microbiobacterial agent, slow release carbon source, catalytic reduction, dephosphorization, greatly enhance the denitrogenation dephosphorizing ability of system;
(2) the present invention is provided with watertight layer, make aerobic system and anaerobic system relatively independent.When can avoid the micro-aeration of aerobic system, destroy the anaerobic environment needed for denitrification, thus the removal effect that the system that ensure that is excellent to total nitrogen;
(3) the present invention adopts compound hydraulic flow state to design, and extends the duration of contact of sewage and filler, reduces the degree of depth of subsurface wastewater infiltration system, and structure is simpler, constructs more convenient;
(4) the present invention adopts micro-aerating system, improves the processing load of system by minimum energy consumption to greatest extent, prevents filler to block;
(5) the present invention adopts zeolite as supporting layer, both can ammonia nitrogen in absorption effluent, and the surface of zeolite rough porous repeatedly can be cut the air from aeration tube again, plays even gas distribution, improves the effect of mass-transfer efficiency;
(6) adopt automatic control system, operational management is simple, safeguards without the need to special messenger.
Get Zhengzhou community life sewage, water quality is as follows:
| Project | COD | BOD 5 | NH 4 +-N | TN | TP |
| Water inlet (mg/L) | 207-325 | 131-197 | 19-32 | 25-39 | 3-6 |
| Water outlet (mg/L) | 19-35 | 3-7 | 1.6-3.4 | 4-8 | 0.08-0.21 |
| Average removal rate | 90% | 95% | 88% | 82% | 98% |
One-level category-A emission standard that water outlet is better than " urban wastewater treatment firm pollutant emission standard GB18918-2002 ".
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system of the present invention.
Embodiment
Intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system is made up of aerobic system, anaerobic system, water inlet system 10, outlet system 11 and micro-aerating system 12, and aerobic system and anaerobic system are separated by watertight layer 9.Top is aerobic system, filler is followed successively by gravel bed a 2, first filter layer 3, composite earth layer a 4, zeolite layer 5 from top to bottom, bottom is anaerobic system, three modules are divided into according to water (flow) direction, filler is followed successively by biocatalysis packing layer 6, composite earth layer b 7, gravel bed b 8 from feed-water end to discharge ends horizontal direction, is tectum 1 on aerobic system, and tectum is original position soil layer or hardening of cement layer, ground can be used as greening, park or other purposes, prevents weight from rolling.Anti-seeping technology is carried out in subsurface wastewater infiltration system both sides and bottom.Water inlet system is made up of the perforated pipe being evenly arranged on gravel bed a
Raw waste water enters adjustment settling tank through grid, removes oarse-grained suspended contaminant, then pumps sewage by submersible sewage pump timing and enters the filler-reinforced denitrifying subsurface wastewater infiltration system of biocatalysis.
First raw waste water enters aerobic system, water distribution uniformity is carried out by the perforation water distributor be located in gravel bed a, aproll effect through gravel bed a is uniformly distributed again, the suspended particulate in sewage is retained downwards by first filter layer, through composite earth layer a, under aerobic microbiological effect, carry out organic absorption degradation, organonitrogen becomes ammonia nitrogen under ammonification, under aerobic nitrification effect, become nitric nitrogen/nitrite nitrogen together with the ammonia nitrogen in sewage, further absorption can also be carried out to untreated ammonia nitrogen in zeolite layer nitrated.Then sewage enters anaerobic system denitrification zone downwards, under biocatalysis filler effect, the sewage being rich in nitric nitrogen carries out denitrification at this, and synchronous dephosphorization, complete organic degraded further, carry out fine filtering by composite earth layer b again, finally discharged by the perforation header in gravel bed b, water outlet is better than GB18918-2002 one-level category-A emission standard.
This system alternation of wetting and drying runs, and psychrometric ratio is 6:1 to 2:1, and every day intakes 3-6 time, after each water inlet 0.5-1h, starts micro-aerating system 0.5-2h, by low power gas blower conveying air to the boring aeration pipe in zeolite layer, carries out micro-oxygen supply to system.Air can be cut into small bubbles by the porous zeolite around boring aeration pipe and composite earth layer a, increase gas, water, solid between mass-transfer efficiency, make microorganism make full use of oxygen degradation pollutent.Micro-aerating system is not only microbiological deterioration pollutent and provides sufficient oxygen, improves the oxidation capacity in the above region of aeration tube, greatly improves the processing load of filtration system, and avoid the accumulation of organic particulate matter, the anticlogging ability of the system that enhances.Micro-aerating system starts after water inlet, and compared with conventional aeration technology, aeration rate is little, aeration time is short, the utilization ratio of oxygen is high, decreases power consumption.
But aeration can destroy the anaerobic environment of system bottom, denitrification is caused to be suppressed.Therefore watertight layer is set between aerobic system and anaerobic system, two systems can not be directly connected, but communicates in side.Greatly limit air like this and enter anaerobic system, ensure that and denitrifyingly to carry out smoothly.
Described biocatalysis filler is formed with in-situ soil Homogeneous phase mixing by a certain percentage by active sludge, chicken manure, rice husk, slag, iron filings.Active sludge mainly provides denitrifying bacterium, shortens the start time of filtration system denitrification.Chicken manure is the carbon source that denitrification provides that the initial stage easily degrades.Rice husk or corn cob can be used as the raising agent of filler on the one hand, prevent filler from blocking; Rich cellulose on the other hand, its organism under anaerobic decomposes stripping gradually, the slow release carbon source that the system that can be used as is permanent.Carbon remaining in slag can with iron filings generation micro-electrolysis reaction, promote denitrifying carrying out, and slag surface rough porous, be conducive to denitrifying bacteria apposition growth.Slag is weakly alkaline simultaneously, also for denitrification provides favourable condition.Be rich in the oxide compound of Ca, Al in slag, synchronously can remove the phosphorus in sewage.
The design of anaerobic system adopts compound hydraulic flow state, combine horizontal flow, upward flow, lower to stream, filler is not only made to contact fully with sewage, the length of filler can also be made to expand in the horizontal direction, reduce the thickness of filler, reduce the degree of depth of subsurface wastewater infiltration system, construct more simple.
Water outlet is located at the top of anaerobic system, avoids current short circuit, also makes whole anaerobic system be in flooded condition, thus ensures the anaerobic environment needed for denitrification.
The packing layer of aerobic system is according to from top to bottom, the order that permeability coefficient reduces successively is laid, and the suspended particulate in sewage retains successively according to the order that particle diameter is descending, avoids being formed at filling surface blocking up, cause surface blocking, cause lower floor's filler fully not utilized.Packing layer is respectively from top to bottom: gravel bed a is made up of 5-20mm gravel, and filling thickness is about 10-15cm.Water distribution system is evenly laid in gravel bed a by perforated pipe.First filter layer is that 0.5-2mm coarse sand forms by particle diameter, and filling thickness is about 10-15cm.Composite earth layer a by slag and original soil by volume 1:1 mix, filling thickness is about 30-50cm.Zeolite layer is made up of the zeolite of 5-15mm, and filling thickness is about 10-15cm.The boring aeration pipe of micro-aerating system is evenly laid in zeolite layer.
Adopt zeolite as supporting layer, both can ammonia nitrogen in absorption effluent, and the surface of zeolite rough porous repeatedly can be cut the air from aeration tube, plays even gas distribution, improves the effect of mass-transfer efficiency.
The filler of anaerobic system can be divided into three modules by the order of water detection flow path direction.First module is biological catalytic filler, is formed by a certain percentage by active sludge, chicken manure, rice husk, slag, iron filings with in-situ soil Homogeneous phase mixing.Its respective volume per-cent is respectively active sludge 1-3%, chicken manure 1-3%, rice husk 1-10%, slag 20-40%, iron filings 0.5-3%, in-situ soil 40-75%.Second module is that composite earth layer b is made up of sand and in-situ soil 1:1 mixing by volume.3rd module is that water outlet gravel bed b is made up of 5-20mm gravel, and water outlet header is positioned at the top of anaerobic system, is located in gravel bed b.The thickness of anaerobic system filler in the vertical direction is 20-40cm, and the width of the first module biocatalysis filler is 0.5-5m, and the width of the second module composite earth layer b is 0.5-5m, and the width of the 3rd module gravel bed b is 0.2-0.5m.
The degree of depth of whole subsurface wastewater infiltration system is that 0.8-1.4m(is not containing overburden layer), substantially reduce digging of engineering dark, construct easier.
Biocatalysis filler is formed with in-situ soil Homogeneous phase mixing by a certain percentage by active sludge, chicken manure, rice husk, slag, iron filings.Its respective volume per-cent is respectively active sludge 1-3%, chicken manure 1-3%, rice husk 1-10%, slag 20-40%, iron filings 0.5-3%, in-situ soil 40-75%.This filler integrates the several functions such as microbiobacterial agent, slow release carbon source, catalytic reduction, dephosphorization.
Anaerobic system of the present invention adopts the design of compound hydraulic flow state, comprises horizontal flow, upward flow, lower to stream.Be divided into three modules according to water (flow) direction, filler is respectively biocatalysis filler, composite earth layer b, gravel bed b, and the contact of sewage and filler is expanded in the horizontal direction, reduces digging of engineering dark.
The present invention adopts micro-aerating system.Subsurface wastewater infiltration system alternation of wetting and drying runs, and psychrometric ratio is 6:1 to 2:1, and every day intakes 3-6 time, after each water inlet 0.5-1h, starts micro-aerating system 0.5-2h.
In the present invention, chicken manure can be replaced by cow dung, old rice; Rice husk can use corn cob, stalk to replace; Slag can replace with flyash, coal gangue subculture.Iron filings can replace with iron powder, Steel-slag.Also a certain amount of plastic filler can be added, as microorganism carrier.Zeolite in supporting layer can use vermiculite, haydite to replace.
Claims (10)
1. an intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system, it is characterized in that: described biocatalysis filler subsurface wastewater infiltration system is by aerobic system, anaerobic system, water inlet system, outlet system and micro-aerating system composition, the top of biocatalysis filler subsurface wastewater infiltration system is aerobic system, bottom is anaerobic system, aerobic system is provided with tectum, aerobic system is followed successively by gravel bed a from top to bottom, first filter layer, composite earth layer a, zeolite layer, anaerobic system is followed successively by biocatalysis packing layer from feed-water end to discharge ends horizontal direction, composite earth layer b, gravel bed b, water inlet system is made up of the perforated pipe being evenly arranged on gravel bed a, outlet system is located at the top of gravel bed b, micro-aerating system 12 is located in zeolite layer.
2. intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system according to claim 1, is characterized in that: described aerobic system and anaerobic system are separated by watertight layer.
3. intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system according to claim 1, it is characterized in that: described gravel bed a is that 5-20mm gravel forms by particle diameter, the thickness of gravel bed a is 10-15cm, and described water inlet system is by being evenly laid in gravel bed perforated pipe; Described first filter layer is that 0.5-2mm coarse sand forms by particle diameter, and the thickness of first filter layer is 10-15cm.
4. intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system according to claim 1, is characterized in that: described composite earth layer a by slag and in-situ soil by volume 1:1 mix, the thickness of composite earth layer a is 30-50cm.
5. intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system according to claim 1, is characterized in that: the zeolite that described zeolite layer is 5-15mm by particle diameter forms.
6. intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system according to claim 1, it is characterized in that: the thickness of described anaerobic system in the vertical direction is 20-40cm, the width of horizontal direction in anaerobic system, the width of biocatalysis packing layer is 0.5-5m, the width of composite earth layer b is 0.5-5m, the width of gravel bed b is 0.2-0.5m.
7. intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system according to claim 1, it is characterized in that: described biocatalysis packing layer is mixed by active sludge, chicken manure, stalk or rice husk, slag, iron filings and in-situ soil, and volume fraction is: active sludge 1-3%, human and animal excreta 1-3%, rice husk 1-10%, slag 20-40%, iron filings 0.5-3%, surplus are in-situ soil.
8. intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system according to claim 1, is characterized in that: the current in described biocatalysis packing layer flow into composite earth layer b, and in composite earth layer b, current flow into gravel bed b.
9. intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system according to claim 1, it is characterized in that: described biocatalysis filler subsurface wastewater infiltration system alternation of wetting and drying runs, psychrometric ratio is 6:1-2:1, every day intakes 3-6 time, after each water inlet 0.5-1h, start micro-aerating system 0.5-2h.
10. intensified anti-nitrated biocatalysis filler subsurface wastewater infiltration system according to claim 1, is characterized in that: the thickness of described biocatalysis filler subsurface wastewater infiltration system is 20-40cm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106007191A (en) * | 2016-06-27 | 2016-10-12 | 中冶华天工程技术有限公司 | Black odorous river course ecological treatment system and treatment method thereof |
| CN106006973A (en) * | 2016-07-20 | 2016-10-12 | 成都理工大学 | Bottom-inflow manual quick percolation system |
| CN109665632A (en) * | 2019-02-25 | 2019-04-23 | 张强 | A kind of technique of fast degradation high concentration eutrophic sewage |
| CN109867403A (en) * | 2017-12-01 | 2019-06-11 | 中国水利水电科学研究院 | A kind of processing unit and sewage water treatment method of dispersing type sewage |
| CN112390335A (en) * | 2020-11-02 | 2021-02-23 | 广西金妙松环保工程有限公司 | Efficient phosphorus removal filler medium capable of generating micro-potential and preparation method thereof |
| CN114506919A (en) * | 2022-03-08 | 2022-05-17 | 江苏海绵城市技术研究院有限公司 | Efficient purification composite biological filler and preparation method thereof |
| CN115594330A (en) * | 2022-09-16 | 2023-01-13 | 同济大学（Cn） | Direct-discharge type sewage treatment system for enhancing treatment efficiency of domestic sewage with low carbon-nitrogen ratio |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007191A (en) * | 2016-06-27 | 2016-10-12 | 中冶华天工程技术有限公司 | Black odorous river course ecological treatment system and treatment method thereof |
| CN106006973A (en) * | 2016-07-20 | 2016-10-12 | 成都理工大学 | Bottom-inflow manual quick percolation system |
| CN109867403A (en) * | 2017-12-01 | 2019-06-11 | 中国水利水电科学研究院 | A kind of processing unit and sewage water treatment method of dispersing type sewage |
| CN109867403B (en) * | 2017-12-01 | 2023-09-22 | 中国水利水电科学研究院 | Decentralized sewage treatment device and sewage treatment method |
| CN109665632A (en) * | 2019-02-25 | 2019-04-23 | 张强 | A kind of technique of fast degradation high concentration eutrophic sewage |
| CN109665632B (en) * | 2019-02-25 | 2021-08-10 | 张强 | Process for rapidly degrading high-concentration eutrophic sewage |
| CN112390335A (en) * | 2020-11-02 | 2021-02-23 | 广西金妙松环保工程有限公司 | Efficient phosphorus removal filler medium capable of generating micro-potential and preparation method thereof |
| CN114506919A (en) * | 2022-03-08 | 2022-05-17 | 江苏海绵城市技术研究院有限公司 | Efficient purification composite biological filler and preparation method thereof |
| CN115594330A (en) * | 2022-09-16 | 2023-01-13 | 同济大学（Cn） | Direct-discharge type sewage treatment system for enhancing treatment efficiency of domestic sewage with low carbon-nitrogen ratio |
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