CN102001797B - Stepwise function-intensified biological and ecological oxidation pond and method for deeply purifying water quality - Google Patents

Stepwise function-intensified biological and ecological oxidation pond and method for deeply purifying water quality Download PDF

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CN102001797B
CN102001797B CN201010587812A CN201010587812A CN102001797B CN 102001797 B CN102001797 B CN 102001797B CN 201010587812 A CN201010587812 A CN 201010587812A CN 201010587812 A CN201010587812 A CN 201010587812A CN 102001797 B CN102001797 B CN 102001797B
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pool
water
oxidation pond
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biological
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CN102001797A (en
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吕锡武
吴义锋
王新刚
朱光灿
王哲明
叶春
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Southeast University
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Southeast University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a stepwise function-intensified biological and ecological oxidation pond, which comprises peripheral bank slopes and an oxidation pond, wherein the peripheral bank slopes are formed by paving ecological concrete prefabricating balls; aquatic plants are planted on the slopes; a soft surrounding baffle wall for blocking the water and guiding the flow is arranged in the oxidation pond; and the soft surrounding baffle wall successively divides the oxidation pond into three functional regions, such as a facultative oxygen pond, an aerobic pond and an aquatic plant pond. The invention also discloses a method for deeply purifying the water quality by utilizing the ecological oxidation pond. The biological and ecological oxidation pond has the advantages that each functional region in the biological and ecological oxidation pond is carried out with the special function establishment design according to the requirements of the water quality; the system can eliminate dissoluble organic matters, nitrogen and phosphorus nutritive salts and suspension solids in the water at high efficiency; the deep purification of the tail water in a sewage treatment plant is realized; and the tail water after being treated is discharged after reaching the first grade A standard all the year around.

Description

The method of stepwise function intensified type biological and ecological oxidation pond and deep purifying water quality
Technical field
The invention belongs to the sewage treatment project technical field, be specifically related to a kind ofly be used to handle the biological and ecological oxidation pond of urban wastewater treatment firm tail water and utilize this biological and ecological oxidation pond to carry out the method for deep purifying water quality.
Background technology
The situation that the whole water environment pollution of China is administered is very severe, and the eutrophication trend in lakes such as Taihu Lake, Chaohu, Dian Chi fails to be effectively controlled.For improving the quality of water environment of above-mentioned lake drainage, country has proposed to propose the target requirement to the urban wastewater treatment firm in its basin perimeter, the discharging tail water that promptly requires sewage work by secondary or one-level B standard upgrading to one-level A standard (GB18918-2002) or stricter emission request.Mark to one-level A standard (GB18918-2002) or more strict demand discharging because urban wastewater treatment firm tail water is carried, the exploitation of sewerage advanced treatment process is extremely urgent.Therefore, urban wastewater treatment firm selects for use little flocculation/filtration, biological pond as advanced treatment unit on the basis of traditional secondary biochemical treatment technology usually, but this treatment process technology operation is complicated, and energy consumption is higher.
Traditional oxidation pond mainly is to rely on the purification function of natural biology to make sewage obtain handling, and it can finish the processing of sanitary sewage, municipal effluent and various organic property trade effluents, can finish the function treatment requirements such as one-level, secondary of sewage disposal.Oxidation pond can make full use of topographical condition, utilizes the not high abandoned channel of agricultural value, swampland etc., and the treatment system energy consumption is less, safeguards that simply, the construction period is short, is easy to construction.Yet also there are some defectives in the conventional oxidation pool, and the removal function of traditional oxidation pond is to remove organism, thereby, usually whole pool body is taked the extended aeration method, with the removal effect of reinforcement COD, and the removal effect of nitrogen, phosphorus is relatively poor.Tail water after the urban wastewater treatment firm second-stage treatment has characteristics such as carbon-nitrogen ratio is little, the ratio of nitrate in TN is big, and the materialization water-purifying process can't effectively be removed the solvability nitrogen phosphorus in the water.In addition, traditional oxidation pond floor space is big, operating performance is unstable, environmental health difference etc., has limited its widespread use.
Summary of the invention
Goal of the invention: the objective of the invention is at the deficiencies in the prior art, provide a kind of nitrogen phosphorus removal effect the good biological oxidation pool.
Another object of the present invention is to provide a kind of utilizes described biological and ecological oxidation pond to carry out the method for deep purifying water quality.
Technical scheme: biological and ecological oxidation pond of the present invention, bank slope and oxidation pond around comprising, described bank slope is all around mated formation by the prefabricated ball of eco-concrete and is formed, and plants on the bank slope and is implanted with waterplant; Bank slope of the present invention is exchange of substance one of intensive zone the most in the oxidation pond aquatic ecosystem, mainly utilize similar natural soil property bank slope water-permeable and air permeable, and the prefabricated ball of cellular concrete that has certain mechanical strength and connect the continuously hole revetment of mating formation, utilize the continuous hole of cellular concrete and spontaneous relatively large space when mating formation, for the enrichment of growth of green plants and microorganism provides good carrier, thereby the ecosystem that the bank slope that has made up ecological pond is specific, the removal effect of reinforcement water pollutant.Waterplant such as preferred disposition Scirpus tabernaemontani, Canna generalis Bailey, calamus on the bank slope.
Be provided with the soft enclosure wall of water proof water conservancy diversion in the described oxidation pond, described soft enclosure wall is divided into hold concurrently the oxygen pool, three functional zone in the aerobic pool and the waterplant pool successively with described oxidation pond.Because mostly oxidation pond is to be formed by former pond or creek reconstruction, thereby the hydraulics of pool body is subjected to multifactor restriction.According to water inlet, the water outlet position of oxidation pond, adopt soft enclosure wall diversion technology to form whole plug-flow layout round-robin hydrodynamic condition in the pool, and avoid occurring in the pool short stream district as far as possible.
Described double oxygen is provided with elastic filler in the pool, and tamped density is 0.15m 3/ m 3, hydraulic detention time is controlled at about 20h, and its major function is to realize denitrification, removes part nitrogen, improves organic biodegradability in the water simultaneously, also is provided with the water conservancy diversion aerating apparatus of intermittent operation simultaneously, and allocating power is pressed 2.0W/m 3Calculate, intermittent operation, suggestion is shut down the 50min mode operation according to start 10min, and operation scheme is pressed oxygen in water concentration 0~0.5mg/L control, and hydraulics is whole plug-flow local circulation.
Hydraulic detention time is controlled at about 8-10h in the described aerobic pool, is provided with the non-woven fabrics or the felt medium of removal effect of organic matter in the fortified water, and it is 0.25m that density is set 3/ m 3, removal effect of organic matter in the fortified water; What also be provided with gap operation simultaneously makes the streaming aerator, and allocating power is by 5~8W/m 3Calculating, is the intermittent operation that the stream aerator is made in 2.0~3.0mg/L control with dissolved oxygen concentration, has guaranteed the demand of the follow-up waterplant pool to dissolved oxygen;
Described waterplant pool hydraulic detention time is 22-32h, be provided with stereo ecological floatation bed, described biological floating bed top planting aquatic plants, bed surface is planted summer and autumn such as mater convolvulus, Herba Eichhorniae etc., winter-spring season is changed crops and is Chinese celery and winter wheat etc., in vegetation season, periodical reaping, plant growing area ratio waterborne is 15%~20%; The bottom hangs elastic filler, and dissolved oxygen concentration is not less than 4.0mg/L in the pool; The waterplant pool utilizes the residue dissolved oxygen in the aerobic pool, relies on lasting nitrogen and phosphorous nutrient and the organism of removing in the water of the stereoscopic biologic chain of setting up.
Thereby described soft enclosure wall is fixed on stable water proof and the guide functions of playing in the oxidation pond by some timbers; The body of wall of described soft enclosure wall is made by geotextile, and geotextile is made by porous material, and preferred long filament or staple fibre non-woven geotextile have stronger accumulation ability to the microorganism in the water, strengthen effects of purification quality.Combine closely by the bottom of long sand bag and oxidation pond in the body of wall bottom, the top of body of wall is connected with cursory, makes the height of body of wall be higher than the water surface.The main sandbag gravity in the structure, cursory buoyancy and the fixing timber of relying on, in water by design requirements enclosure waters, thereby realize the water conservancy diversion and the function division thereof of water body in the ecological pond.
For reducing wind-force to the sectional perturbation action of difference, the body of wall of described soft enclosure wall exceeds water surface 0.3m.
The volumetric ratio on the described double oxygen pool, the aerobic pool and the waterplant pool is 5: 2: 3, and the depth of water on the described double oxygen pool is more than the 3m, and the depth of water on the described aerobic pool is 2.5m, and the depth of water on the described waterplant pool is 1~1.5m; The gradient of described bank slope is 1: 1~1: 2.
The described double oxygen pool is that width is the gallery of 3.0m, and described elastic filler is filled in the gallery; Described elastic filler is set to the rectangular element of 2.5m * 1.0m, and tamped density is 0.15m 3/ m 3, hang and to be spaced apart 200mm, at the bottom of the end distance pond 0.2m under the elastic filler, the upper end is not higher than the water surface, vertically with water (flow) direction is provided with one every 4m, evenly arranges.
The described aerobic pool is that width is the gallery of 5.0~8.0m, and non-woven fabrics or felt adopt suspension type to install, and described non-woven fabrics or felt density of medium are 0.25m 3/ m 3
In the described waterplant pool, described stereo ecological floatation bed upper surface is concordant with the water surface, and lower surface is 0.2m at the bottom of the pool.
The biological oxidation pool that the present invention makes up is particularly useful for the advanced treatment with the big urban wastewater treatment firm tail water of trade effluent proportion, with respect to municipal sewage plant's tail water water quality, it is poorer that low contaminated industry waste water has biodegradability of organic matter, the characteristics that carbon-nitrogen ratio is littler, the nitric nitrogen proportion is big, dissolved organic matter, the nitrogen and phosphorous nutrient that is difficult to effectively remove in the water handled in materialization, the function optimization subregion is carried out with pool body in the new bio biological oxidation pool, the purification of water quality measure that configuration is suitable, bring into play function separately, guaranteed the qualified discharge of effluent quality.
Of the present inventionly utilize described biological and ecological oxidation pond to carry out the method for deep purifying water quality, comprise the steps:
(1) sewage is imported in the oxygen pool of holding concurrently, hydraulic detention time is 20~25h, utilizes the intermittent operation of water conservancy diversion aerating apparatus, and control oxygen in water concentration is 0~0.5mg/L, forms the hydraulics of whole plug-flow local circulation;
(2) will import in the aerobic pool from the sewage that comes out the oxygen pool of holding concurrently, hydraulic detention time is 8-10h, and dissolved oxygen concentration is controlled at 2~3mg/L, by non-woven fabrics or felt medium enriched microorganism, the aerator intermittent operation forms in the aerobic pool near complete blended fluidised form;
The sewage that (3) will come out from the aerobic pool imports in the waterplant pool, hydraulic detention time is 22~32h, dissolved oxygen concentration is not less than 4.0mg/L in the pool, utilizes the residue dissolved oxygen in the aerobic pool, relies on biologic chain in stereo ecological floatation bed to continue to remove nitrogen and phosphorous nutrient and organism in the water.
In the step (1), the water conservancy diversion aerating apparatus takes to move the 10min operation scheme of 50min at interval.
The present invention compared with prior art, its beneficial effect is: 1, the present invention is based on the lineament that dense waterway net region pond, Plain or creek gather, a kind of biological and ecological oxidation pond of urban wastewater treatment firm Tailwater Depth processing and method of deep purifying water quality of being applicable to proposed, the present invention is based on soft enclosure wall water conservancy diversion, ecological bank slope, the artificial dielectric enriched microorganism, the optimum combination of multiple technologies such as biological floating bed, little according to urban wastewater treatment firm tail water carbon-nitrogen ratio, the nitric nitrogen ratio is big, water quality characteristicses such as biodegradability difference are built into 3 function divisions with ecological pond: (1) the oxygen pool of holding concurrently; (2) the aerobic pool; (3) the waterplant pool, form ecosystem urban wastewater treatment firm tail water complete, that have complementary functions biological and ecological oxidation pond and deep treatment method successively, sewage in the biological and ecological pool according to the hydraulics of optimizing each function division of flowing through successively, do not need sewage or mud to reflux in the system, the operational management on the biological oxidation pool is easy, and function allocation is clear and definite; 2, effluent stream is when holding concurrently the oxygen pool, hydraulic detention time is about 20~25h, make the flow device intermittent operation, in the oxygen pool of holding concurrently, formed the hydraulics of whole plug-flow, local circulation, at first carry out denitrification and remove part nitrate, also improve simultaneously the biodegradability of sewage, reduced the pollution load on the aerobic pool; 3, the dissolved oxygen concentration in the aerobic pool is controlled at 2~3mg/L, major function remove organism in the water, simultaneously for the follow-up waterplant pool provides dissolved oxygen, to guarantee the demand of stereo ecological floatation bed microorganism physiological activity; 4, each function division is carried out special formation function design according to its purification of water quality demand in the biological oxidation of the present invention pool, dissolved organic matter in the water, nitrogen and phosphorous nutrient and suspended solids can efficiently be removed by this system, realize the deep purifying of sewage treatment plant tail water, tail water reaches one-level A effluent standard the whole year after treatment; 5, the function intensified type biological and ecological of stepwise of the present invention oxidation pond is compared with the conventional oxidation pool, hydraulic load improves more than 2 times, realize that the identical purification efficiency following residence time of condition reduces significantly, or pollutant purification efficient increases substantially under the identical hydraulic detention time condition; Compare with little flocculation/filtration even depth treatment process, nutritive salt clearance height such as nitrogen phosphorus, operational management is easy, energy-saving effect is better, and the present invention handles for the urban wastewater treatment firm Tailwater Depth science, effective practical technique is provided; 6, the structure of biological and ecological oxidation pond of the present invention, purification of water quality principle based on biological-ecological, break through defectives such as conventional oxidation pool floor space is big, sewage treating efficiency difference, adopt multiple technologies optimum combinations such as porous material ecological revetment, soft enclosure wall water conservancy diversion, underwater jet aeration oxygenation, catalytic oxidation, ecological floating island, broken through the low limitation of complex management, nitrogen removal efficiency of materialization treatment process, do not need return-flow system in the system, strengthen the removal of nitrogen phosphorus, be particularly useful for the urban wastewater treatment firm Tailwater Depth and handle; 7, the stereo ecological floatation bed nutritive salt such as organism in the water and nitrogen phosphorus that can continue to remove are set in the waterplant of the present invention pool, guarantee that the ecological pond effluent quality reaches the tail water emission request of " urban wastewater treatment firm pollutent comprehensive discharge standard (GB18918-2002) " one-level A standard or " the main water pollutant emission limit of TAI HU AREA urban wastewater treatment firm and priority industry industry (DB32/T1072-2007) " regulation.
Description of drawings
Fig. 1 is the process principle figure of the function intensified type biological and ecological of stepwise of the present invention oxidation pond.
Fig. 2 is soft enclosure training wall.
Fig. 3 is porous concrete ecological shore protection figure.
Fig. 4 is non-woven fabrics dielectric frame unit.
Fig. 5 is stereo ecological floatation bed orthographic plan.
Fig. 6 is stereo ecological floatation bed A-A sectional view.
Fig. 7 is ecological floating bed plant growth tray.
Embodiment
Below in conjunction with accompanying drawing, by a most preferred embodiment, technical solution of the present invention is elaborated, but protection scope of the present invention is not limited to described embodiment.
Urban wastewater treatment firm tail water water quality characteristics generally shows carbon-nitrogen ratio and is generally 5~10 for a short time, and nitric nitrogen is that proportion reaches more than 80% in the pollutent at nitrogen, BOD 5/ COD is less than 0.1, and the biodegradability extreme difference requires advanced treatment process must be suitable for above-mentioned water quality characteristics, has stronger pollutant removal function.And, space and leeway that the ecological pond treatment process does not have sewage or mud to reflux, must be based on hydromechanics, environmental engineering, ecological engineering principle, divide in science on the basis of ecological pond function division, adopt multi-disciplinary basic theories such as water conservancy diversion shunting, catalytic oxidation, jet-flow aeration, ecological structure to make up perfect bioecosystem of ecological pond and stronger contaminant removal capacity.Raising sub-petrifaction sewage treatment plant tail water with Nanjing is example, and the treatment effect of new bio ecological pond to low contaminated industry waste water is described.The sewage disposal flow process that sub-general petrochemicals factory is raised in Nanjing is: after terephthalic acid (PTA) factory effluent in the clean workshop of this factory carries out pre-treatment and resource recovery, waste water with raise sub-petrochemical industry plant area composite wastewater, Nanjing chemical industrial park trade effluent focuses on after mixing again, treatment process is a grid, and---------even matter is regulated, and---A/O/A/O (microbial film)---precipitation---filtration, the water yield is 4100m to coagulation air-float in neutralization 3/ h adopts the technology of the present invention to transform raising the original landscape pond of sub-petrochemical industry, and advanced treatment is carried out in the water outlet of settling tank.
Concrete scheme is as follows:
(1) structure of porous concrete ecological bank slope
Hole building up principle based on ecological engineering science, new bio biological oxidation pool bank slope is abandoned hard bank protection structure in the past, and adopt similar natural soil property bank slope water-permeable and air permeable characteristics, and the cellular concrete with certain mechanical strength and continuous perforation hole is ecological bank slope carrier construction, the preparation of cellular concrete be by materials such as the rubble of the single grating of particle diameter 1.5~25mm, PII52.5 silicate cement, mineral additive, high-performance water reducing agent and alkaline slow releasing agent cooperate by a certain percentage, stirring, compacting and tamping moulding, wherein water cement ratio is about 0.25.The porosity of cellular concrete self is 15~25%, permeability coefficient 1.5~2.0mm/s, and ultimate compression strength is 10~20MPa.Among the present invention cellular concrete is made as spherical building block in advance and mats formation, reserve the through hole of three-dimensional in the spheroid, adopt the web member of antirust processing be connected in series between ball and the ball and fix.Except that cellular concrete self porosity, the nature of mating formation that spherical building block constitutes has formed 47% voidage, for aquatic macrophyte provides the growing space.
(2) soft enclosure wall water conservancy diversion, as shown in Figure 2:
The optimization of biological and ecological oxidation pond hydraulics among the present invention, with the hydraulics that forms whole plug-flow, local circulation in the biological and ecological oxidation pond is target, the soft enclosure of water proof and guide functions is played in flexible materials enclosure waters such as employing geotextile, and current are flowed in the gallery of enclosure.The embodiment of soft enclosure is: soft enclosure material is long filament or blend fiber non-woven geotextile, and the sandbag of the about 0.2m of diameter is made in the geotextile bottom, fills sand grains, utilizes the sandbag deadweight to make and combines closely at the bottom of the soft enclosure and the pool; The basis of soft enclosure is the semi-circular groove at its underpart digging diameter 0.2m, receives the sandbag of soft enclosure bottom to hold; Soft enclosure top relies on the buoyancy of float for fishing string to hold up geotextile, and makes it exceed water surface 0.3m; Soft enclosure is provided with a fixedly timber every 5m, drifts about on the water surface to limit soft enclosure.
(3) biological and ecological oxidation pond bank slope construction of ecosystems, as shown in Figure 3:
The structure of biological and ecological oxidation pond bank slope particular ecosystem is to be carrier with the cellular concrete, domatic filling soil, and associating green plants and microorganism make up particular ecosystem, to strengthen the removal effect of pollutent.After the cellular concrete blockwork is mated formation, be filled to the space of cellular concrete with regard near the thick soil of surface layer 20mm advancing to take, root with inducing plant, domatic employing urban wastewater treatment firm tail water behind the earthing or water to spill with regard near surface and be no less than 5 times, each 3~5 days at interval, with the alkali of releasing of abundant dilution cellular concrete.Carry out slope vegetation then and plant life.It is main that slope vegetation is selected the vegetation type of fibrous root system for use, as hornwort, withered grass, calamus, Scirpus tabernaemontani etc., needs as considering view, experimental results show that the waterplant such as Canna generalis Bailey of ball-type root system also can better be suitable for the habitat of the specific bank slope ecosystem.The initial stage planting density of large-scale emergent is 9 strains/m 2, submerged plant is 25 strains/m 2The natural enrichment of growth of green plants of ecological domatic process and animal, microorganism has promptly formed the specific bank slope ecosystem.Vegetation zone structure on the ecological bank slope is followed successively by submerged plant, emergent, herbaceous vegetation, has realized domatic natural transition of going up aquatic ecological to Lu Sheng ecology.The bank slope particular ecosystem mainly by ecology the green plants on domatic improve water quality and repair ecological, and the stability of coming further consolidation system with cellular concrete carrier and domatic matrix enriched microorganism.
(4) biological and ecological oxidation pond water quality purification function subregion and purification of water quality measure thereof
According to the influent quality characteristics, adopt soft enclosure training wall that the ecological pond enclosure is 3 function divisions such as the oxygen pool, the aerobic pool and the waterplant pool of holding concurrently, and separately purification of water quality facility of configuration realized the environmental quality of function division separately, finishes the removal to dissimilar pollutents, as shown in Figure 1.
The double oxygen pool: about the about 20h of hydraulic detention time, adopt soft enclosure training wall to be divided into the gallery that width is 3.0m, gallery is filled elastic filler, hangs and is spaced apart 200mm.Elastic filler is set to the rectangular element of 2.5m * 1.0m, is 0.2m at the bottom of the end distance pond under the elastic filler, and the upper end is not higher than the water surface, vertically with water (flow) direction is provided with one every 4m, evenly arranges.According to double oxygen pool volume size, configuration submerged type stirrer, allocating power is 2.0W/m 3(according to rated output, selecting many uniform installations for use), suggestion take to move the 10min operation scheme of 50min at interval, to prevent the excessive reoxygenation of water body.
The aerobic pool: hydraulic detention time is about 8-10h, and width of corridor 5.0~8.0m in the pool is provided with the non-woven fabrics medium with enriched microorganism, and the non-woven fabrics filler adopts the sheet hanging method perpendicular to horizontal plane, sees Fig. 4, and packing height is with the elastic filler in the oxygen pool of holding concurrently.What submerged type was set in the pool makes the stream aerator, and allocating power is 5~8W/m 3(according to rated output, select many uniform installations for use), the installation of aerator should help to form in the aerobic pool near complete blended fluidised form, its operation scheme is intermittent operation, opening and closing time is pressed the dissolved oxygen concentration in the water and is decided, according to the purification of water quality requirement, dissolved oxygen concentration is controlled at 2.0~3.0mg/L in the aerobic pool.
The waterplant pool: hydraulic detention time is 22-32h, is provided with stereo ecological floatation bedly in the pool, and Fig. 5, Fig. 6, Fig. 7 are seen in its installation, and the ecological floating island area accounts for about 20% of water area in the pool.Floating bed top is according to the different waterplant of seasonal variation seed selection, and in the Taihu Lake basin scope, plant annual April such as mater convolvulus, Herba Eichhorniae etc., and the harvesting cycle is 15~20 days; Changing crops September is overwintering plants such as Chinese celery, rye grass, and the harvesting cycle is 45~60 days.The facility of ecological floating island should guarantee the working space that the waterplant harvesting is changed crops, and its suitable width is 3.0m.The plant vector height is concordant with the water surface.Hang elastic filler below plant floating bed, the filler bottom is 0.2m at the bottom of the pool.
(5) biological and ecological oxidation pond key design parameter:
Hydraulic detention time: 50-87h;
The suitable volumetric ratio on double the oxygen pool, the aerobic pool and the waterplant pool: 5: 2: 3
The oxygen pool depth of water of holding concurrently be 3m or more than, the aerobic pool and the suggestion of waterplant pool significant depth are respectively: 2..5m and 1~1.5m.
The bank slope gradient: 1: 1~1: 2.
The pollutant removal of ecological pond sees Table 1.
Table 1 Inlet and outlet water water quality monitoring (WQM) (unit: mg/L, the no unit of pH value)
Project COD TP TN NH 3-N DO pH BOD 5
Influent quality 42~113 0.49~1.29 10.3~16.1 1.2~4.1 1.2~4.9 7.3~8.1 2.8~14.3
Effluent quality 32~42 0.22~0.48 4.0~6.9 0.1~0.2 1.3~3.2 7.2~7.8 2.5~4.6
One-level A standard ≤50 ≤0.5 ≤15 ≤5(8) - 6~9 ≤10
The DB32 standard 1 ≤60 ≤0.5 ≤15 ≤5 - - -
1Annotate: this standard is the provincial standard that Jiangsu Province implements at the water pollution control of Taihu Lake basin, full name is " the main water pollutant emission limit of TAI HU AREA urban wastewater treatment firm and priority industry industry (DB32/T1072-2007) ", has stipulated Taihu Lake basin petroleum chemical industry sewage work (trade effluent>80%) pollutant emission standard in this standard.
As mentioned above, although represented and explained the present invention that with reference to specific preferred embodiment it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention prerequisite that does not break away from the claims definition, can make various variations in the form and details to it.

Claims (10)

1. the function intensified type biological and ecological of a stepwise oxidation pond comprises bank slope and oxidation pond all around, it is characterized in that: described bank slope is all around mated formation by the prefabricated ball of eco-concrete and is formed, and plants on the bank slope and is implanted with waterplant; Be provided with the soft enclosure wall of water proof water conservancy diversion in the described oxidation pond, described soft enclosure wall is divided into hold concurrently the oxygen pool, three functional zone in the aerobic pool and the waterplant pool successively with described oxidation pond; Described double oxygen is provided with elastic filler in the pool, also is provided with the water conservancy diversion aerating apparatus of intermittent operation simultaneously; Be provided with the non-woven fabrics or the felt medium of removal effect of organic matter in the fortified water in the described aerobic pool, what also be provided with gap operation simultaneously makes the streaming aerator; Be provided with in the described waterplant pool stereo ecological floatation bed, described biological floating bed top planting aquatic plants, the bottom hangs elastic filler.
2. biological and ecological oxidation pond according to claim 1 is characterized in that: thus described soft enclosure wall is fixed on stable water proof and the guide functions of playing in the oxidation pond by some vertical stakes; The body of wall of described soft enclosure wall is made by geotextile, combines closely by the bottom of long sand bag and oxidation pond in the body of wall bottom, and there is the gaily decorated basket of planting aquatic plants soft enclosure wall both sides, the top of body of wall, and gaily decorated basket top height is higher than 1 centimeter of the water surface.
3. biological and ecological oxidation pond according to claim 2 is characterized in that: the body of wall of described soft enclosure wall exceeds water surface 0.2m.
4. biological and ecological oxidation pond according to claim 1, it is characterized in that: the volumetric ratio on the described double oxygen pool, the aerobic pool and the waterplant pool is 5: 2: 3, the depth of water on the described double oxygen pool is more than the 3m, and the depth of water on the described aerobic pool is 2.5m, and the depth of water on the described waterplant pool is 1~1.5m; The gradient of described bank slope is 1: 1~1: 2.
5. biological and ecological oxidation pond according to claim 1 is characterized in that: the described double oxygen pool adopts soft enclosure wall to be divided into gallery, makes current become the plug-flow form, and described elastic filler is filled in the gallery; Described elastic filler is set to the rectangular element of 2.5m * 1.0m, and tamped density is 0.15m 3/ m 3, hang and to be spaced apart 200mm, at the bottom of the end distance pond 0.2m under the elastic filler, the upper end is not higher than the water surface, vertically with water (flow) direction is provided with one every 4m, evenly arranges.
6. biological and ecological oxidation pond according to claim 1 is characterized in that: the described aerobic pool is that width is the gallery of 5.0~8.0m, adopts suspension type non-woven fabrics or felt medium, and described non-woven fabrics or felt density of medium are 0.25m 3/ m 3
7. biological and ecological oxidation pond according to claim 1 is characterized in that: in the described waterplant pool, described stereo ecological floatation bed upper surface is concordant with the water surface, and lower surface is 0.2-0.5m at the bottom of the pool.
8. biological and ecological oxidation pond according to claim 1 is characterized in that: the plant area accounts for 15~20% of water surface area in the described waterplant pool.
9. a method of utilizing the described biological and ecological oxidation pond of arbitrary claim in the claim 1~8 to carry out deep purifying water quality is characterized in that comprising the steps:
(1) sewage is imported in the oxygen pool of holding concurrently, hydraulic detention time is more than the 20h, utilizes the intermittent operation of water conservancy diversion aerating apparatus, and control oxygen in water concentration is 0~0.5mg/L, forms the hydraulics of whole plug-flow local circulation;
(2) will import in the aerobic pool from the sewage that comes out the oxygen pool of holding concurrently, hydraulic detention time is 8-10h, and dissolved oxygen concentration is controlled at 2~3mg/L, by non-woven fabrics or felt medium enriched microorganism, the aerator intermittent operation forms in the aerobic pool near complete blended fluidised form;
The sewage that (3) will come out from the aerobic pool imports in the waterplant pool, hydraulic detention time is 22~32h, dissolved oxygen concentration is not less than 4.0mg/L in the pool, utilizes the residue dissolved oxygen in the aerobic pool, relies on biologic chain in stereo ecological floatation bed to continue to remove nitrogen and phosphorous nutrient and organism in the water.
10. the method for deep purifying water quality according to claim 9 is characterized in that: in the step (1), the water conservancy diversion aerating apparatus takes to move the 10min operation scheme of 50min at interval.
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