WO2009094882A1 - Système de chambres filtrantes écologiques avec vers de terre, disposées en tour - Google Patents

Système de chambres filtrantes écologiques avec vers de terre, disposées en tour Download PDF

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Publication number
WO2009094882A1
WO2009094882A1 PCT/CN2008/073509 CN2008073509W WO2009094882A1 WO 2009094882 A1 WO2009094882 A1 WO 2009094882A1 CN 2008073509 W CN2008073509 W CN 2008073509W WO 2009094882 A1 WO2009094882 A1 WO 2009094882A1
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Prior art keywords
layer
water
pipe
ecological filter
tower
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PCT/CN2008/073509
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English (en)
Chinese (zh)
Inventor
Zheng ZHENG
Junzhuang Li
Xingzhang Luo
Shiguan Yang
Jibiao Zhang
Jihong Li
Rongyan Shen
Jingwei Feng
Peipei Li
Guangyin Chen
Caixia Fang
Weiping Wang
Xingxing Zou
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Nanjing University
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Publication of WO2009094882A1 publication Critical patent/WO2009094882A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/06—Aerobic processes using submerged filters
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the invention relates to sewage treatment, in particular to a high-load tower-type ecological filter, which can be used for the treatment of relatively concentrated domestic sewage discharged in the vast villages and towns and tourist scenic spots.
  • the tower type ecological filter system mentioned in the present invention is a land treatment system using an enhanced ecological technology, which is based on the ecological functions such as the ingestion of organic matter, the improvement of soil aeration and water permeability, and the synergistic action of earthworms and microorganisms. Designed as a multi-layer multi-stage water treatment system for sewage.
  • the system has the advantages of low capital and operation management costs, strong nitrogen and phosphorus removal capacity, good effluent quality, and no public health impact.
  • the core process tower of the system is a combination of biotechnology and ecological technology.
  • the filter tank is a vertical tower structure, which is not convenient for the replacement of the packing, maintenance of the water pipe, plant growth, and transplanting of the seedlings;
  • the present invention is directed to an improvement in the problems associated with the tower type eco-filter system and is an improvement over the applicant's patent CN200410014641.9.
  • it adopts the hydrolysis acidification tank as the pre-treatment technology according to local conditions, and forms a combined process with the tower-type ecological filter.
  • the structure of the tower-type ecological filter is improved, and the gradient tower layer design is adopted to facilitate the management of the filter.
  • the combination of the surface water of the filler and the internal water of the filler, the establishment of a special drainage system, the slope design of the bottom of the filter and the solidification treatment of the corner cement completely solve the uneven distribution of water in the system and the actual operation.
  • the problem of low hydraulic load is to improve the nitrogen removal capacity and drainage capacity of the system.
  • the water aeration technology is adopted to increase the dissolved oxygen concentration in the influent water.
  • the utility model relates to a tower type ecological filter system, which is composed of a hydrolysis acidification tank and a multi-stage tower type ecological filter tank.
  • the hydrolysis acidification tank is a buried pool with an inlet and outlet and an inspection port, and the structure is shown in FIG.
  • the acidification tank is provided with a brick-concrete baffle to prevent short-flow.
  • the effluent is dosed through a submersible pump to a high-level distribution tank above the tower-shaped ecological filter.
  • the volume design of the hydrolysis acidification tank is mainly based on the amount of sewage and the hydraulic retention time of the sewage.
  • the calculation formula is:
  • V is the volume of the acidification tank
  • Q is the flow rate of the end of the pipe network
  • T is the hydraulic retention time of the sewage.
  • the tower type ecological filter has the structure shown in Figure 2. It adopts modular structure, gradient tower design and multi-stage unit serial processing. Each tower is a processing unit, which can be square, rectangular or circular. In practice, different combinations of structural modes can be used depending on the actual terrain: stair type or rotary type. The stair type is the tower level, and the back transformation is the rotation of the tower structure, which makes the overall filter pool intensive, and at the same time facilitates filter management and maintenance.
  • the illumination area increases, which helps the plant growth on the surface of the filter packing, strengthens the adsorption and transformation of the roots on the pollutants in the sewage and the oxygen secretion of the roots.
  • the sewage is adsorbed and converted by each unit, it flows into the next unit for purification.
  • the multi-unit series processing design greatly improves the decontamination capability of the system.
  • the packing of each layer of the tower-type ecological filter is basically the same.
  • the upper layer of the packing is made of wood-rich organic matter such as wood chips and rice husks added to the local suitable loam, fine sand (loam, wood chips or rice husk, fine sand according to 6: 2: 1 ⁇ 9: 3:1 volume ratio of mixed artificial soil composition, which helps nitrifying bacteria, denitrifying bacteria maintain a high amount and maintain high activity, this layer is called a trampoline due to cockroach activity, ⁇
  • the thickness of the bed is generally 30 ⁇ 40cm; the middle layer is layered by fine sand and 3 ⁇ 20mm gravel, and the thickness is 10 ⁇ 15cm respectively.
  • the pollutants in the sewage will continue to be adsorbed and degraded.
  • the hydraulic pressure of the whole system can be ensured by the larger permeability coefficient; It is composed of 50mm and pebbles with a thickness of 20 ⁇ 25cm, which plays a role of support and drainage.
  • a certain amount and type of strontium are placed in the trampoline, and the density of strontium is 8g ⁇ 12g ( ⁇ )/(L filler).
  • the species are divided into surface layer and deep layer.
  • the surface layer is Daping No. 2, which is placed in the depth of 3 ⁇ 7cm.
  • the deep layer is William Ring, which is placed at the depth of 15 ⁇ 20cm in the trampoline.
  • the tower type ⁇ ecological filter system in each stage of the processing unit, while the surface is watered, in order to increase the uniformity of the water distribution, an inner layer of water pipes is provided in the special soil filler.
  • a goal valve is installed on the main inlet pipe of the water pipe, and a bypass valve is installed at the branch of the inlet pipe. This allows the inlet valve to be balanced between the surface distribution pipe and the deep distribution pipe by controlling the goal valve.
  • Each level of surface water distribution pipe is a single row of PVC cloth water pipes.
  • the diameter of the water holes of the cloth is 8mm ⁇ 12mm, the distance between the water holes of the connected cloth is 20 ⁇ 35mm;
  • the inner water distribution pipe is a double-row hole PVC cloth water pipe, cloth.
  • the diameter of the water hole is 6mm ⁇ 12mm, the distance between the water holes of the connected cloth is 35 ⁇ 40mm, the buried depth of the inner layer water pipe is 25-30cm inside the packing, the material is PVC pipe;
  • the inner layer water pipe is wrapped with geotextile
  • the bluestone, the outer layer of the geotextile is a special soil infiltration layer composed of specially prepared artificial soil.
  • the special soil filler is composed of local loam, wood chips and fine sand, to 6: 2: 1 ⁇ 9: 3: 1 Mix than volume ratio.
  • the influent water in the inner layer of the first-stage processing unit is the effluent of the hydrolysis acidification tank, and its COD concentration is generally 200-500 mg/L, thus overcoming the special organic carbon source due to the complete surface water distribution.
  • the shortage of carbon source in the subsequent denitrification process of the underlying artificial soil filler caused by the soil filler interception greatly promotes denitrification; the inflow of the inner layer water distribution pipe of the next-stage treatment unit is the effluent of the upper treatment unit, thus, It can effectively alleviate the shortage of carbon sources in the denitrification process.
  • the filter tank of each stage of the treatment unit adopts a brick slab structure, which is built with two or four walls, 20 mm waterproof mortar is used in the pool body, and a reinforced concrete prefabricated structure is adopted at the bottom of the pool;
  • the bottom of the groove of the water distribution tank adopts a prefabricated structure, and the edge of the preform is 5 mm beyond the wall.
  • the filter pool body of each primary treatment unit is made at four corners.
  • Cement solid sealing treatment plane, structure yin and yang corner, should be rounded, round corner radius is generally 50mm, the angle is 10mm.
  • the water-discharging aeration technology is adopted in the high-position water distribution tank to strengthen the dissolved oxygen DO content in the influent water.
  • the drop level can be 1 ⁇ 3, and the drop height of each level is 0.5m.
  • the vertical-type water-falling baffle is placed to make the sewage evenly distributed after impacting the baffle, so that a better oxygenation effect can be achieved; the design single-width flow is 20 ⁇ 50m 3 /(m 2 .h).
  • the high water distribution tank is connected to the lower level water pipe through the goal valve.
  • a water spray device is adopted for each level of surface water distribution to increase the DO content in the effluent of the primary treatment unit and the secondary treatment unit, that is, the perforated pipe is used for water, and the diameter of the perforation can be 6 ⁇ 12mm, the flow rate of the hole is 1.5 ⁇ 2.5m/s, and the installation height is 0.3 ⁇ 0.6m.
  • the above-mentioned tower type ecological filter system adds a drainage system to the bottom layer of the system, and discharges the deep treated sewage through the drainage system, thereby increasing the system's ability to treat sewage.
  • the drainage system is provided with a corrugated drainage pipe at the bottom of the filter.
  • the pipe is made of 4" and PVC pipe. Considering the drainage efficiency, the pipe network should not be too thin.
  • the distance between the drainage pipes is about 0.7m, and the water collection pipe is composed of pebbles.
  • the isolation layer can prevent the soil in the percolation layer from blocking the water collecting pipe and affect the drainage.
  • the filling layer is a pebble layer filled with pebbles having a particle diameter of not less than 20 mm and not more than 50 mm; the gradient of the drainage pipe is 0.5%, and the pebble compaction coefficient is 0.9, and shall not damage the PVC guide tube.
  • the above-mentioned tower type ecological filter system uses a timer to control the submersible pump power switch.
  • the ratio of water distribution time to system drying time is controlled within the range of 1:3 ⁇ 1: 5, and the water distribution period is set to 1 day, which can maximize the ecological function of the cockroach and realize the realization of denitrification aerobic-anoxic environment. .
  • the tower type ecological filter system can effectively increase the impact load on the sewage, the surface hydraulic load can reach lm 3 /(m 2 .d) ; the dissolved oxygen content in the influent is greatly improved, and the water is aerated by falling water.
  • the DO in the influent water can be increased from 0.3mg/L to more than 6mg/L; the system can greatly improve the nitrogen removal capacity of the system, and the total nitrogen removal efficiency of the system is above 80% in the environment above 10°C; The time is extended to more than 1.5 hours, which enhances the removal of pollutants.
  • the removal efficiency of COD & , nitrogen, and total phosphorus can reach over 90%.
  • the effluent Under the current water quality conditions of village and town sewage, the effluent can meet the requirements of GB8978-1996 National Sewage Discharge Standard.
  • Figure 1 is a schematic diagram of the structure of the hydrolysis acidification tank, wherein: 1 is the inlet pipe; 2 is the inspection port; 3 is the safety pipe; 4 is the brick mixing baffle; 5 is the submersible pump.
  • FIG. 2 is a schematic diagram of the tower raft ecological filter system, wherein: 6 is a hydrolysis acidification tank; 7 is a high water distribution tank; 8 is a surface water distribution pipe; 9 is a boring machine; 10 is a bypass valve; 11 is an inner layer water distribution pipe 12 is a sandstone layer; 13 is a pebble Floor.
  • Embodiment 1 Demonstration project of tower type ecological filter system with daily treatment capacity of 10t.
  • the hydrolysis acidification tank is 4 meters long and 3 meters wide.
  • the effective depth is 1.2m, the height is 0.3m, and the total depth is 1.5m. It is a basement layer with a top surface elevation of -0.00 and a plate thickness of 20mm.
  • the inlet pipe is embedded at a height of 25 cm from the base of the pool wall, and the angle between the inlet and the wall is 40° downward, and the lower edge of the pipe is flush with the inner wall of the wall.
  • the effluent is dosed through a submersible pump to the high water distribution tank above the tower raft ecological filter.
  • the embedding port is densely packed with fine stone concrete.
  • the pool installation is buried, and the pool body adopts a brick structure.
  • the total area of the tower type ecological filter is 30 m 2 , and the overall structure adopts brick-concrete structure.
  • the inner side of the high-position water tank is 4 X 3 X lm, the bottom plate is a prefabricated structure, and the side wall is extended by 5 mm; the two-stage vertical slit type water baffle is placed to achieve the oxygenation effect, and the single width flow rate is 25 m 3 / ( m 2 .h).
  • the length is 4m, the width is 3m, the height is lm, and the height is 0.2m.
  • the bottom of the pool has a certain slope of 1%;
  • the length is 4.3m, the width is 3m, the height is lm, and the height is 0.2m.
  • the bottom of the pool has a certain slope of 1%;
  • the length is 5m, the width is 3m, the height is lm, and the height is 0.2m.
  • the bottom of the pool has a certain slope of 1%;
  • Each level of surface water pipe is a single row of PVC cloth water pipes.
  • the diameter of the water holes is 8mm, and the distance between the water holes of the connected cloth is 35mm.
  • the inner water pipe is a double-row PVC water pipe, and the diameter of the water hole. For 10mm, the distance between the water holes of the connected cloth is 30mm, and the buried depth of the inner layer water pipe is 30cm inside the packing, and the material is PVC pipe.
  • the inner layer of water pipes is surrounded by bluestones wrapped with geotextiles.
  • the outer layer of geotextiles is a special soil infiltration layer composed of specially prepared artificial soil.
  • the drainage system is installed at the bottom of the filter, the drainage pipe is made of corrugated drainage pipe, the pipe is 4", PVC pipe; the distance between the drainage pipes is 0.6m, and the separation layer composed of pebbles around the water collection pipe is not less than 10mm and not Filled with pebbles larger than 50mm; the slope of the drain pipe is 0.5%, the pebble compaction coefficient is 0.9, and the PVC guide pipe must not be damaged.
  • the upper layer of the filler of each treatment unit is a 45 cm thick artificial soil filler layer, and the middle is a 20 cm thick spun yarn layer, a 20 cm thick gravel layer, and a 15 cm thick pebble layer.
  • the artificial soil filler consists of local suitable loam, wood chips and sand, and is mixed in a ratio of 6:2:1 by volume.
  • the first-stage treatment unit is placed in Daping No. 2 at 3 ⁇ 7cm in the trampoline, and the density is 10g ( ⁇ )/(L filler); the ringworm is placed at 10 ⁇ 15cm in the trampoline, and the density is 14g ( ⁇ ). / (L filler).
  • the second-stage treatment unit is placed at 3 to 7 cm in the trampoline, and the delivery density is 8 g ( ⁇ ) / (L filler); the trampoline is placed at 10 to 15 cm in the trampoline, and the density is 12 g ( ⁇ ). / (L filler).
  • the third-stage treatment unit placed Daping No. 2 at 3 ⁇ 7cm inside the trampoline, and the release density was 8g ( ⁇ )/(L filler); the ringworm was placed at 10 ⁇ 15cm in the trampoline, and the density was 10g ( ⁇ ) / (L filler).
  • Example 2 Demonstration project of tower type ecological filter system with daily treatment capacity of 7t.
  • the pool is installed in an underground manner with a top surface elevation of -0.00 and a plate thickness of 20mm.
  • the inlet pipe is inserted at a height of 25 cm from the base of the pool wall, and is 30° downward from the pool wall.
  • the effluent is dosed through a submersible pump to a high water tank above the tower's ecological filter.
  • the embedding port is densely packed with fine stone concrete.
  • the pool installation is buried, and the pool body adopts a brick structure.
  • the pool body adopts a brick structure.
  • the total area of the tower type ecological filter is 24 m 2 :
  • the inner side of the high-position water tank is 2.5 X 1.5 X lm.
  • the bottom plate is a prefabricated structure with a side wall extending 5 mm around it; a two-stage vertical slit type water baffle is placed to achieve the oxygenation effect, and the single width flow rate is 30 m 3 / ( m 2 .h).
  • the length is 3m, the width is 3m, the height is lm, and the height is 0.2m.
  • the bottom of the pool has a slope of 1%;
  • the length is 3.5m, the width is 3m, the height is lm, and the height is 0.2m.
  • the bottom of the pool has a certain slope of 1%;
  • the length is 4m, the width is 3m, the height is lm, and the height is 0.2m.
  • the bottom of the pool has a certain slope of 1%;
  • Each level of surface water pipe is a single row of PVC cloth water pipes.
  • the diameter of the water holes is 8mm, and the distance between the water holes of the connected cloth is 35mm.
  • the inner water pipe is a double-row PVC water pipe, and the diameter of the water hole. For 10mm, the distance between the water holes of the connected cloth is 25mm, and the buried depth of the inner layer water pipe is 25-30cm inside the packing, and the material is PVC pipe.
  • the inner layer of the water pipe is covered with geotextile wrapped in geotextile.
  • the outer layer of the geotextile is a special soil percolation layer composed of specially prepared artificial soil.
  • the drainage system is installed at the bottom of the filter tank.
  • the water collection pipe adopts corrugated drainage pipe.
  • the pipe is 4", PVC pipe; the distance between the drainage pipes is 0.8m.
  • the isolation layer consisting of pebbles around the water collection pipe is not less than 10mm and not Greater than 50mm.
  • the pebbles are filled; the slope of the drain pipe is 0.5%, the pebble compaction coefficient is 0.9, and the PVC guide pipe must not be damaged. test
  • the upper layer of the filler of each treatment unit is a 45 cm thick artificial soil filler layer, and the middle is a 20 cm thick spun yarn layer, a 20 cm thick gravel layer, and a 15 cm thick pebble layer.
  • the artificial soil filler is composed of local suitable loam, rice husk and sand, and mixed in a ratio of 6:2:1 by volume.
  • the first-stage treatment unit is placed in Daping No. 2 at 3 ⁇ 7cm in the trampoline, and the density is 10g ( ⁇ )/(L filler); the ringworm is placed at 10 ⁇ 15cm in the trampoline, and the density is 14g ( ⁇ ). / (L filler).
  • the second-stage treatment unit is placed at 3 to 7 cm in the trampoline, and the delivery density is 8 g ( ⁇ ) / (L filler); the trampoline is placed at 10 to 15 cm in the trampoline, and the density is 12 g ( ⁇ ). / (L filler).
  • the third-stage treatment unit placed Daping No.
  • Example 3 Stabilization function of the hydrolysis acidification tank in Example 1
  • the water quality index is measured continuously for one week to monitor the fluctuation of water quality.
  • water is taken from the distribution pool and the water quality indicators are measured on Monday, Thursday and Sunday. , analysis of water quality stability.
  • Example 4 The stable function of the hydrolysis acidification tank in Example 2.
  • Example 5 The overall decontamination ability test of the combined process in Example 1.
  • the test conditions are as follows:
  • the single-stage hydraulic load of the tower type ecological filter is 0.8m 3 /m 2 .d, the dry-wet dosing time ratio For 4: 1, a timer is used to control the water distribution time.
  • the density of the crucible in the trampoline is 10 g ( ⁇ ) / (L filler). The results are as follows:
  • Example 6 The overall decontamination capability test of the combined process in Example 2.
  • the natural hydraulic retention time of the system is about 160 minutes; the total nitrogen removal of the system is still maintained at 86%; the removal rate of other substances in the system is about 90%, showing a good removal effect.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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  • Treatment Of Biological Wastes In General (AREA)

Abstract

Système de chambres filtrantes écologiques avec vers de terre, disposées en tour et comprenant un bassin (6) d'acidification par hydrolyse et un filtre écologique avec vers de terre de type tour multi-étage. Le bassin d'acidification par hydrolyse est un bassin enterré. Chaque couche du filtre écologique avec vers de terre de type tour constitue une unité de traitement de forme carrée, rectangulaire ou ronde. La tour présente une configuration en escalier, tournante ou une combinaison de celles-ci, de telle sorte que l'entretien et le remplacement du garnissage s'effectuent commodément. La couche supérieure du garnissage est constituée de glaise additionnée de carbone ; comme cette couche comporte des vers de terre, elle est appelé lit (9) à vers de terre. L'épaisseur du lit (9) à vers de terre est de 30 à 40 cm ; la couche médiane (12) est remplie de sable fin et de graviers de 3 à 20 mm disposés en couches ; et la couche inférieure (13) est composée de déblais d'un diamètre de grain de 10 à 50 mm. Des tuyaux (11) sont installés pour répartir régulièrement l'eau dans le lit (9) à vers de terre ; des techniques d'aération et de pulvérisation de l'eau par chute sont adoptées afin d'améliorer la concentration en oxygène dissous des eaux usées. Le système de chambres filtrantes écologiques avec vers de terre disposées en tour est capable d'améliorer sensiblement la charge transitoire admissible pour les eaux usées et la charge hydraulique à la surface atteint 1 m3/ (m2 d) ; les capacités de dénitrification et de déphosphoration sont considérablement améliorées.
PCT/CN2008/073509 2008-01-23 2008-12-15 Système de chambres filtrantes écologiques avec vers de terre, disposées en tour WO2009094882A1 (fr)

Applications Claiming Priority (2)

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CN200810018775.6 2008-01-23
CNA2008100187756A CN101250014A (zh) 2008-01-23 2008-01-23 塔式蚯蚓生态滤池系统

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CN105297673B (zh) * 2015-11-18 2017-11-07 天津大学 用于景观河湖的岸边自循环式曝气清淤装置及控制方法
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