CN104176882A - Water feeding method and device for improving nitrogen removal efficiency of constructed infiltration system - Google Patents

Water feeding method and device for improving nitrogen removal efficiency of constructed infiltration system Download PDF

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CN104176882A
CN104176882A CN201410393265.2A CN201410393265A CN104176882A CN 104176882 A CN104176882 A CN 104176882A CN 201410393265 A CN201410393265 A CN 201410393265A CN 104176882 A CN104176882 A CN 104176882A
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water
layer
tank
sewage
pond
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CN201410393265.2A
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CN104176882B (en
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方涛
鲍少攀
汪贵和
唐巍
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中国科学院水生生物研究所
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Abstract

The invention discloses a water feeding method and device for improving the nitrogen removal efficiency of a constructed infiltration system. The method comprises the following steps: A, collection and pretreatment of original sewage: pumping the original sewage in a drainage ditch into a sedimentation tank through a control valve and a sewage pump which are connected with the sedimentation tank, and removing suspended matters and sand from the original sewage in the sedimentation tank; B, water lift: lifting the pretreated original sewage in the sedimentation tank to an elevated tank by the sewage pump; and C, deep treatment: controlling the effluent in the elevated tank by the control valve, discharging the pretreated water to a packing layer of a rapid infiltration tank, thus achieving sewage treatment. The sedimentation tank is connected with the drainage ditch through the sewage pump and the control valve on a pipeline, the sewage pump is connected with the sedimentation tank, the effluent is connected with the elevated tank through the sewage pump, the elevated tank is connected with a water inlet pipeline, the water inlet pipeline is connected with the rapid infiltration tank through the control valve on the pipeline, and a perforated water distribution pipe is connected with a water outlet pipeline. Nitrogen, phosphorus and COD (chemical oxygen demand) can be removed by the CRI (Constructed Rapid Infiltration) system. The device is simple in structure and convenient to use, and can be used for realizing efficient purification of sewage.

Description

A kind of inlet method and device that improves artificial filtration system nitric efficiency
Technical field
The present invention relates to utilize artificial rapid infiltration system to remove the technical field of nitrogen in sewage, more specifically relate to a kind of inlet method that improves artificial rapid infiltration system nitric efficiency, also relate to a kind of device that improves the water inlet of artificial rapid infiltration system nitric efficiency, it is applicable to process the sanitary sewage of the most of rural area of China, samll cities and towns.
Background technology
Along with economic fast development and mankind's activity strengthen day by day, the various pollutant emissions such as increasing trade effluent, sanitary sewage, domestic refuse and agricultural chemicals, in natural water, have produced pollution in various degree to water resources.People are when pursuing economic interests, society constantly increases the demand of water, yet China resident environmental consciousness is weak, quantity of precipitation differences between the south and the north are large, the factors such as water use efficiency is low are constantly aggravated the nervous situation of China's water resources supply and demand, cause China's water resources problems also to diversified development, point source and pollution of area source problem are outstanding day by day, and sudden water pollution event takes place frequently, Ecology is on the hazard safely, and water problems stack and cumulative effect are more and more serious etc.
Enforcement sewage disposal is innoxious, resource utilization, processes and combines with utilization, and the technology that manual handling and naturally processing are parallel, is to meet the existing national conditions of China completely.Particularly, the big city sanitary sewage water yield is large, sewage complicated component, and its municipal ability to shoulder economically is strong, should take manual handling as main, and implementation focuses on; And the sanitary sewage in small and medium-sized cities, cities and towns, rural area, composition is simple, should implement take the technology such as soil processing as main innoxious, resource utilization sewage disposal policy.Can predict, sewage disposal is innoxious, the enforcement of resource utilization, and on the one hand, the limited water resources quantity of Jiang Shi China greatly increases; On the other hand, it will be purified our water surrounding, and then realizes resource, economy, environment, the society strategic objective of sustainable development comprehensively.
Artificial rapid infiltration system (CRI system) is a kind of as land treatment system, has and not limited by region landform, and floor space is little, and investment cost is low, processes the high advantage of load.Therefore, be necessary that further investigation makes it to become maturation, economy, wastewater land treatment process efficiently, for China's small town sewage and polluted river water is administered and sewage recycling contributes.Artificial rapid infiltration system is as a kind of emerging technique, still not enough on the impact understanding for the treatment of effect about environmental factors and operating parameter at present, the removal mechanism research of its pollutent is also insufficient, and these all can the steady running in Practical Project cause disadvantageous effect to CRI system.
Therefore, about aspects such as the concrete operating parameter of CRI system, actual operating efficiencies, also have many improvements for the treatment of.The research of current optimization CRI system processing efficiency is mainly from the selection of adsorption medium and the design of CRI structure, less on the research of CRI system processing efficiency impact about inlet method.According to the research before us, employing is different from the segmental influent method of traditional inlet method, can effectively improve CRI system nitric efficiency (referring to environmental engineering journal, the < < segmental influent methods such as Wang Guihe, Fang Tao affect > > to manpower rapid-infiltration system nitric efficiency).But there is the shortcoming that hydraulic load is lower in segmental influent method, and owing to oozing soon the difference of pond different layers microenvironment, for different water water quality, need to choose suitable segmental influent position and water inlet ratio, can improve the clearance of CRI system to nitrogen, this has just increased the workload in actual moving process.
In the present invention, applicant has proposed a kind of inlet method and device of the CRI of raising system nitric efficiency.
Summary of the invention
The object of the invention is to be to provide a kind of inlet method that improves artificial rapid infiltration system nitric efficiency, can improve artificial rapid infiltration system nitric efficiency.Be different from traditional downstream inlet method, sewage is from top to bottom by filtration media, and a kind of up stream inlet method involved in the present invention, is in CRI system, to adopt bottom water inlet, the mode of top layer water outlet.Adopt up stream inlet method, CRI system is to the clearance of ammonia nitrogen and total nitrogen apparently higher than conventional inlet method, and along with the increase of influent load, the clearance of ammonia nitrogen and total nitrogen also increases gradually.CRI system convention inlet method has higher clearance to total phosphorus, COD etc., but the clearance of nitrogen is lower.The up stream water inlet proposing is combined with traditional downstream, easy to implement the method, easy and simple to handle, guaranteed the removal of CRI system to nitrogen, phosphorus and COD.
Another object of the present invention is to be to provide a kind of water feed apparatus that improves artificial rapid infiltration system nitric efficiency, and this plant area area is little, cheap, simple in structure, easy to use, can realize the high-efficient purification to sewage.
An inlet method that improves artificial filtration system nitric efficiency, the steps include:
(1) raw waste water is collected and pre-treatment: the raw waste water in ejectment irrigation canals and ditches enters settling tank by the controlling valve and the sump pump extraction that are connected settling tank, raw waste water can be removed wherein suspended substance and silt in settling tank, microorganism and itself absorption to nutritive salt of pleuston surface attachment simultaneously, part that can be removed N, P, BOD and COD;
(2) water level promoting: pretreated raw waste water rises to header tank by sump pump by water extraction in settling tank, the water being stored in header tank can directly enter and ooze soon pond through controlling valve when needed under action of gravity.
(3) advanced treatment: header tank is after controlling valve is controlled water outlet, enter inlet channel, again through perforation water distributor water distribution uniformity, oozing soon pond packing layer, (filler divides five layers to pretreated water, top layer is the natural river sand of particle diameter 1.5-2 mm, the second layer is particle diameter 2-4 mm natural river sand, the 3rd layer is the pebbles of particle diameter 20-100 mm, the 4th layer is the coarse sand of particle diameter 4-8 mm, layer 5 is in the pebbles of particle diameter 20-100 mm) from bottom to top layer diafiltration, and finally by top layer water outlet, enter outlet conduit, and again the water after processing is entered to ejectment irrigation canals and ditches, reach the effect to advanced treatment of wastewater.
A kind of water feed apparatus that improves artificial rapid infiltration system nitric efficiency: this device comprises settling tank, header tank, oozes pond, controlling valve, ejectment irrigation canals and ditches, raw waste water, sump pump, inlet channel, perforation water distributor, outlet conduit soon, (top layer is the natural river sand of particle diameter 1.5-2 mm to filler, the second layer is particle diameter 2-4 mm natural river sand, the 3rd layer is the pebbles of particle diameter 20-100 mm, the 4th layer is the coarse sand of particle diameter 4-8 mm, and layer 5 is the pebbles of particle diameter 20-100 mm).It is characterized in that: settling tank is connected with ejectment irrigation canals and ditches with controlling valve by the sump pump on pipeline, ejectment irrigation canals and ditches regulate and control by controlling valve the water yield that raw waste water enters settling tank, and be connected with settling tank through sump pump, raw waste water is after settling tank precipitation, water outlet is connected with header tank through sump pump, water lift is to header tank, header tank is connected with inlet channel, and the water yield that enters inlet channel is controlled in header tank water outlet through controlling valve, and through inlet channel with ooze soon pond and be connected, inlet channel with ooze soon bottom, pond perforation water distributor and be connected, perforation water distributor distributes the water to and oozes soon in pond, stop after 1 day, through outlet conduit, directly enter ejectment irrigation canals and ditches.
Oozing soon pond is to be highly 2m, length and width are the cement pit of 1 m, wherein be filled with adsorption stuffing, the degree of depth of filler is that 1.7 m(packing layers divide five layers from top to bottom: it is the natural river sand of 1.5-2 mm that 400 mm particle diameters are filled on upper strata, it is 2-4 mm natural river sand that the second layer is filled 500 mm particle diameters, the 3rd layer is filled 100 mm particle diameters is the pebbles of 20-100 mm, the 4th layer is filled 400 mm particle diameters is the coarse sand of 4-8 mm, it is the pebbles of 20-100 mm that layer 5 is filled 300 mm particle diameters), and be provided with perforation water distributor oozing soon pond different depths (bottom 1.7 m and 0.2 m depths, top layer), and be connected with header tank by inlet channel.During concrete enforcement, when adopting up stream inlet method, close the perforation water distributor of 0.2 m depths, top layer, sewage enters the perforation water distributor of bottom 1.7m depths through inlet channel, sewage after water distribution uniformity is processed to top layer diafiltration from packing layer bottom, and from top layer, 0.2 m discharge enters outlet conduit to the water after processing; When needs contrast conventional inlet method, close the perforation water distributor of bottom 1.7 m depths, sewage enters the perforation water distributor of 0.2 m depths, top layer through inlet channel, sewage after water distribution uniformity infilters row from packing layer top layer to bottom and processes, and the water after processing is discharged and entered outlet conduit from bottom 1.7 m.
A kind of concrete building process of the water feed apparatus that improves artificial rapid infiltration system nitric efficiency is as follows:
(1) structure of artificial rapid infiltration system, sanitary sewage is through settling tank, header tank and ooze soon pond precipitation;
(2) in artificial rapid infiltration system, ooze soon the layout of pond water inlet, outlet conduit, oozing soon top layer, pond and bottom laying water-in and water-out pipeline, wherein inlet channel is porous water distributor.
(3) ooze soon pond filtration media screening, typical media filler comprises gac, natural zeolite, biological ceramic particle, slag, coarse sand (particle diameter is 4-8 mm).
(4) utilize common sanitary sewage will ooze soon after pond success biofilm, optimize artificial rapid infiltration system operating parameter, comprise wet-dry ratio (wet/dry=4:1-1:4), filter layer thickness (1-2 m), hydraulic load (0.5-5 m/d) etc.
(5) CRI system adopts respectively traditional inlet method and up stream inlet method, contrasts the impact of two kinds of inlet methods on artificial rapid infiltration system nitric efficiency.
(6) water inlet, oozing soon pond stop after 1 day, divides and gets into water and water outlet water sample, total nitrogen and ammonia-nitrogen content in test water sample, and calculate clearance, according to clearance, just obtain more excellent inlet method.
TN: alkaline potassium persulfate oxidation-ultraviolet spectrophotometry; NH 3-N: nessler reagent colorimetry;
Clearance=(influent quality-effluent quality)/influent quality * 100 %.
The present invention compared with prior art, has the following advantages and effect:
The present invention can improve artificial rapid infiltration system nitric efficiency effectively, thereby administer and make larger contribution for rural area, samll cities and towns' polluted water body, also for further improving artificial rapid infiltration system treatment effect, provide thinking and reference, meanwhile, up stream inlet method involved in the present invention has the following advantages:
(1) CRI system adopts the inlet method of up stream to inherit the advantage of CRI system under traditional inlet method, and if not limited by region landform, floor space is little, and investment cost is low, processes the high advantage of load.
(2) taking the inlet method of up stream to be conducive to sewage is full of more uniformly pond body and fully contacts with filler, be conducive to a certain extent guarantee the stable of effluent quality, from the top layer water outlet of CRI system, be conducive to the convection current with air in addition, thereby increase the ratio of oxygen exchange, guarantee to contain certain density oxygen in water outlet.
(3) suit measures to local conditions, can near having the river course of sewage discharge, carry out original position reparation, do not cause secondary pollution, to sewage pre-treatment, require low.
(4) owing to oozing soon top layer, pond, more easily contact with atmosphere, reoxygenation process more easily occurs, thereby guarantees that oozing soon top layer, pond contains certain density oxygen, is conducive to the carrying out of nitrification, improves the clearance of ammonia nitrogen, estimates that the clearance of ammonia nitrogen can reach more than 70%.
Accompanying drawing explanation
Fig. 1 is a kind of schematic flow sheet that improves the inlet method of artificial filtration system nitric efficiency.
Raw waste water 1 is again promoted to header tank B after sump pump 2 is promoted to standing 24 h of settling tank A, and pretreating sewage flows into and oozes soon pond C from header tank B along pipeline, water outlet after oozing soon pond C to process 1 day.
Fig. 2 is a kind of pond C-structure schematic diagram that oozes soon.
The degree of depth of oozing soon pond C filler in this embodiment in CRI system is that 1.7 m(packing layers divide five layers from top to bottom: it is the natural river sand of 1.5-2 mm that 400 mm particle diameters are filled on upper strata, it is 2-4 mm natural river sand that the second layer is filled 500 mm particle diameters, the 3rd layer is filled 100 mm particle diameters is the pebbles of 20-100 mm, the 4th layer is filled 400 mm particle diameters is the coarse sand of 4-8 mm, and it is the pebbles of 20-100 mm that layer 5 is filled 300 mm particle diameters.)
Fig. 3 is the main treatment unit schematic diagram of a kind of artificial filtration system.
Comprising settling tank A, header tank B, oozes pond C soon, controlling valve D, ejectment irrigation canals and ditches E, controlling valve F, raw waste water 1, sump pump 2, sump pump 3, inlet channel, 4, perforation water distributor 5, outlet conduit 6, filler 7(top layer is the natural river sand of particle diameter 1.5-2 mm, the second layer is particle diameter 2-4 mm natural river sand, the 3rd layer is the pebbles of particle diameter 20-100 mm, and the 4th layer is the coarse sand of particle diameter 4-8 mm, and layer 5 is the pebbles of particle diameter 20-100 mm).Its annexation is: the water yield that ejectment irrigation canals and ditches E enters settling tank A by controlling valve D regulation and control raw waste water 1, and be connected with settling tank A through sump pump 2, raw waste water 1 is after settling tank A precipitation, water outlet is connected with header tank B through sump pump 3, water lift is to header tank B, header tank B is connected with inlet channel 4, and the water yield that enters inlet channel 4 is controlled in header tank B water outlet through controlling valve F, and through inlet channel 4 with ooze soon pond C and be connected, inlet channel 4 with ooze soon C bottom, pond perforation water distributor 5 and be connected, perforation water distributor 5 distributes the water to and oozes soon in the C of pond, stop after 1 day, through outlet conduit 6, directly enter ejectment irrigation canals and ditches E.
Embodiment
After now specific embodiments of the invention being discussed in.
Embodiment 1:
Known according to Fig. 1, a kind of inlet method that improves artificial filtration system nitric efficiency, the steps include:
(1) raw waste water is collected and pre-treatment: the raw waste water 1 in ejectment irrigation canals and ditches E enters settling tank A by the controlling valve D and sump pump 2 extractions that are connected settling tank A; Raw waste water 1 can be removed wherein suspended substance and silt in settling tank A, microorganism and itself absorption to nutritive salt of pleuston surface attachment simultaneously, part that can be removed N, P, BOD and COD;
(2) water level promoting: pretreated raw waste water 1 rises to header tank B by sump pump 3 by water extraction in settling tank A, the water being stored in header tank B can directly enter and ooze soon pond C through controlling valve F when needed under action of gravity.
(3) advanced treatment: header tank B is after controlling valve F controls water outlet, enter inlet channel 4, again through perforation water distributor 5 water distribution uniformities, (filler 7 totally 1.7 m is dark oozing soon pond C packing layer for pretreated water, divide from top to bottom five layers, top layer is the natural river sand of particle diameter 1.5-2 mm, the second layer is particle diameter 2-4 mm natural river sand, the 3rd layer is the pebbles of particle diameter 20-100 mm, the 4th layer is the coarse sand of particle diameter 4-8 mm, layer 5 is in the pebbles of particle diameter 20-100 mm) from bottom to top layer diafiltration, and finally by top layer water outlet, enter outlet conduit 6, and again the water after processing is entered to ejectment irrigation canals and ditches E, reach the effect to advanced treatment of wastewater.
Embodiment 2:
Known according to Fig. 2, Fig. 3, a kind of water feed apparatus that improves artificial rapid infiltration system nitric efficiency: it comprises settling tank A, header tank B, ooze soon pond C, controlling valve D, ejectment irrigation canals and ditches E, controlling valve F, raw waste water 1, sump pump 2, sump pump 3, inlet channel 4, perforation water distributor 5, outlet conduit 6, filler 7(top layer is the natural river sand of particle diameter 1.5-2 mm, the second layer is particle diameter 2-4 mm natural river sand, the 3rd layer is the pebbles of particle diameter 20-100 mm, and the 4th layer is the coarse sand of particle diameter 4-8 mm, and layer 5 is the pebbles of particle diameter 20-100 mm).It is characterized in that: settling tank A is connected with ejectment irrigation canals and ditches E with controlling valve D by the sump pump 2 on pipeline, the water yield that ejectment irrigation canals and ditches E enters settling tank A by controlling valve D regulation and control raw waste water 1, and be connected with settling tank A through sump pump 2, raw waste water 1 is after settling tank A precipitation, water outlet is connected with header tank B through sump pump 3, water lift is to header tank B, header tank B is connected with inlet channel 4, and the water yield that enters inlet channel 4 is controlled in header tank B water outlet through controlling valve F, inlet channel 4 by the controlling valve F on pipeline with ooze soon pond C and be connected, inlet channel 4 with ooze soon C bottom, pond perforation water distributor 5 and be connected, perforation water distributor 5 is connected with outlet conduit 6, perforation water distributor 5 distributes the water to and oozes soon in the C of pond, stop after 1 day, through outlet conduit 6, directly enter ejectment irrigation canals and ditches E.
Described header tank B is rectangular parallelepiped cement pit, is highly 6 m, and length and width are 2 m.Header tank can be used to store through pretreated sewage, and can directly rely on action of gravity to supply water to oozing soon pond.It is above to guarantee enough water outlet loads that the header tank B depth of water maintains 4 m.
Described perforation water distributor 5 is vertical three horizontal water tubes (being evenly distributed with the aperture that diameter is 2 mm on water pipe) in bottom 1.7 m depths, wherein a longitudinal tubule (L tubule) is connected with inlet channel 4, the same deep layer of top layer perforation water distributor 5 (bottom perforation water distributor 5 is used when up stream inlet method, and top layer perforation water distributor 5 is used when downstream inlet method).
Oozing soon pond C is to be highly 2 m, length and width are the cement pit of 1 m, wherein be filled with adsorption stuffing 7, the degree of depth of filler 7 is that 1.7 m(packing layers divide five layers from top to bottom: it is the natural river sand of 1.5-2 mm that 400 mm particle diameters are filled on upper strata, it is 2-4 mm natural river sand that the second layer is filled 500 mm particle diameters, the 3rd layer is filled 100 mm particle diameters is the pebbles of 20-100 mm, the 4th layer is filled 400 mm particle diameters is the coarse sand of 4-8 mm, it is the pebbles of 20-100 mm that layer 5 is filled 300 mm particle diameters), and ooze soon pond C different depths (bottom 1.7 m and 0.2 m depths, top layer) be provided with perforation water distributor 5, and be connected with header tank B by inlet channel 4.During concrete enforcement, when adopting up stream inlet method, close the perforation water distributor 5 of 0.2 m depths, top layer, sewage enters the perforation water distributor 5 of bottom 1.7 m depths through inlet channel 4, sewage after water distribution uniformity is processed to top layer diafiltration from packing layer bottom, and from top layer, 0.2 m discharge enters outlet conduit 6 to the water after processing; When needs contrast conventional inlet method, close the perforation water distributor 5 of bottom 1.7 m depths, sewage enters the perforation water distributor 5 of 0.2 m depths, top layer through inlet channel 4, sewage after water distribution uniformity infilters row from packing layer top layer to bottom and processes, and the water after processing is discharged and entered outlet conduit 6 from bottom 1.7 m.
A kind of concrete building process of the water feed apparatus that improves artificial rapid infiltration system nitric efficiency is as follows:
(1) structure of artificial rapid infiltration system, raw waste water 1 is again promoted to header tank B after sump pump 2 is promoted to standing 24 h of settling tank A, and sewage flows into and oozes soon pond C from header tank B along pipeline.
The pilot scale settling tank A that builds is highly 2 m, and length and width are respectively 4 m and 3 m, and the depth of water maintains 1-1.5 m, and sewage stops 1 day therein.
The header tank B that builds is rectangular parallelepiped, is highly 6 m, and length and width are 2 m, and it is above to guarantee enough water outlet loads that the depth of water maintains 4 m.
That builds oozes pond C totally 7 single ponds (6 use 1 are standby) soon, is highly 2 m, and length and width are 1 m, and wherein the filler degree of depth is 1.7 m, and totally 5 layers of fillers are respectively natural river sand (fine sand), natural river sand (sand), pebbles, coarse sand, pebbles from top layer to bottom.Each layer thickness is respectively 0.4,0.5,0.1,0.4,0.3 meter from top to bottom.
(2) in artificial rapid infiltration system, ooze soon the layout of pond C water inlet, outlet conduit 6, inlet channel 4 is set in oozing soon pond C, in the present invention, adopt bottom inlet method, pretreated water is after header tank B flows out, by pipeline, enter and ooze soon pond C bottom water-in, inlet channel 5 is vertical three horizontal porous vascellum ambulacrales, enter after oozing soon pond C and slowly upwards flood upper strata filler, finally be kept above filler 10 cm, sewage is oozing pond C stop after 1 day soon, from outlet conduit 6 water outlets, outlet conduit 6 is arranged in the middle of surface materials, i.e. the dark 20 cm places of top layer filler.
(3) ooze soon pond C filtration media screening, typical media comprises gac, natural zeolite, biological ceramic particle, slag, coarse sand, in the embodiment of the present invention 1, the 4th layer of adsorption medium used is rough sand (particle diameter 4-8 mm), and its porosity and water ratio are respectively 39.01%, 11.59%.
(4) utilize common sanitary sewage will ooze soon after the biofilm of pond, optimize artificial rapid infiltration system operating parameter, comprise wet-dry ratio (wet/dry=4:1-1:4), filter layer thickness (1-2 m), hydraulic load (0.5-5 m/d) etc.(environmental engineering journal, 2012, Fang Tao etc. on existing Research foundation, novel artificial rapid infiltration system is processed villages and small towns sewage process parameter optimizing), it is 1:2 that the present embodiment is selected wet-dry ratio, and filter layer thickness is 1.7m, and hydraulic load is the operating parameter of 0.8-1.2 m/d.Wherein contrasting the optimum hydraulic load of the conventional water inlet of pond employing is 1 m/d.(referring to environmental engineering journal, the < < segmental influent methods such as Wang Guihe, Fang Tao affect > > to manpower rapid-infiltration system nitric efficiency)
(5) CRI system adopts respectively traditional inlet method and up stream inlet method, and water inlet, oozing soon pond C stop after 1 day, divides and gets into water and water outlet water sample, and test water sample total nitrogen, ammonia nitrogen, calculate clearance, according to clearance, just obtains more excellent inlet method.
TN: alkaline potassium persulfate oxidation-ultraviolet spectrophotometry; NH 3-N: nessler reagent colorimetry;
Clearance=(influent quality-effluent quality)/influent quality * 100 %.
(6) experimental result and analysis
Experiment establish 3 parallel, experimental result is expressed as mean number ± standard error (Mean ± SD), as shown in table 1 below.
Under the different influent loads of table 1 to pollutants removal rate
Table 1 is that CRI system adopts up stream inlet method and conventional inlet method clearance to pollutent under different influent loads.As seen from table, the inlet method by up stream is all better than conventional inlet method to the clearance of ammonia nitrogen and total nitrogen, and along with the increase ammonia nitrogen of influent load and the clearance of total nitrogen also increase gradually.Especially on to the removal of total nitrogen, at influent load, be under 1.2m/d, take the more conventional water inlet of up stream inlet method to improve 26.9% to the clearance of total nitrogen.
From the clearance of up stream inlet method CRI system to ammonia nitrogen and total nitrogen under different influent loads, under up stream inlet method, suitably improve influent load and be conducive to the removal of CRI system to nitrogen.
(7) net result
Above-mentioned experimental result shows, takes up stream inlet method, can effectively improve to a certain extent the nitric efficiency of CRI system.And under up stream inlet method, suitably improve influent load and be conducive to the removal of CRI system to nitrogen.Therefore adopt up stream inlet method and device in the present invention, can combine with CRI system convention inlet method and device, thereby reach the synchronous removal to nitrogen, phosphorus and COD.The method is easily gone, easy and simple to handle, for optimization and the improvement of CRI system provides reference.

Claims (4)

1. improve an inlet method for artificial filtration system nitric efficiency, the steps include:
(1) raw waste water is collected and pre-treatment: the raw waste water (1) in ejectment irrigation canals and ditches (E) enters settling tank (A) by the controlling valve (D) and sump pump (2) extraction that are connected settling tank (A), raw waste water (1) is removed wherein suspended substance and silt in settling tank (A), microorganism and itself absorption to nutritive salt of pleuston surface attachment simultaneously, removes part N, P, BOD and COD;
(2) water level promoting: pretreated raw waste water (1) rises to header tank (B) by sump pump (3) by water extraction in settling tank (A), the water being stored in header tank (B) directly enters and oozes soon pond (C) through controlling valve (F) under action of gravity;
(3) advanced treatment: header tank (B) is after controlling valve (F) is controlled water outlet, enter inlet channel (4), again through perforation water distributor (5) water distribution uniformity, pretreated water is oozing pond (C) packing layer soon from bottom to top layer diafiltration, finally by top layer water outlet, enter outlet conduit (6), water after processing is entered to ejectment irrigation canals and ditches (E), reach advanced treatment of wastewater.
2. a kind of water feed apparatus that improves artificial rapid infiltration system nitric efficiency claimed in claim 1: it comprises settling tank (A), header tank (B), ooze soon pond (C), controlling valve (D), ejectment irrigation canals and ditches (E), controlling valve (F), sump pump (2), sump pump (3), inlet channel (4), perforation water distributor (5), outlet conduit (6), filler (7), it is characterized in that: settling tank (A) is connected with ejectment irrigation canals and ditches (E) with controlling valve (D) by the sump pump on pipeline (2), sump pump (2) is connected with settling tank (A), water outlet is connected with header tank (B) through sump pump (3), header tank (B) is connected with inlet channel (4), inlet channel (4) by the controlling valve on pipeline (F) with ooze soon pond (C) and be connected, inlet channel (4) with ooze soon bottom, pond (C) perforation water distributor (5) and be connected, perforation water distributor (5) is connected with outlet conduit (6).
3. a kind of water feed apparatus that improves artificial rapid infiltration system nitric efficiency according to claim 2, it is characterized in that: the described pond (C) of oozing is soon to be highly 2 m, length and width are the cement pit of 1 m, wherein be filled with adsorption stuffing (7), the degree of depth of filler (7) is 1.7 m, packing layer divides five layers from top to bottom: it is the natural river sand of 1.5-2 mm that 400 mm particle diameters are filled on upper strata, it is 2-4 mm natural river sand that the second layer is filled 500 mm particle diameters, the 3rd layer is filled 100 mm particle diameters is the pebbles of 20-100 mm, the 4th layer is filled 400 mm particle diameters is the coarse sand of 4-8 mm, it is the pebbles of 20-100 mm that layer 5 is filled 300 mm particle diameters.
4. a kind of water feed apparatus that improves artificial rapid infiltration system nitric efficiency according to claim 2, is characterized in that: described perforation water distributor (5) bottom is vertical three horizontal water tubes, and wherein a longitudinal tubule (L tubule) is connected with inlet channel (4).
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