CN101898856B - Subsurface flow constructed wetland system of secondary effluent from sewage treatment plant and application thereof - Google Patents
Subsurface flow constructed wetland system of secondary effluent from sewage treatment plant and application thereof Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 238000005273 aeration Methods 0.000 claims abstract description 55
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011574 phosphorus Substances 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 241000196324 Embryophyta Species 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 238000005276 aerator Methods 0.000 claims description 5
- 239000004927 clay Substances 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 229910021536 Zeolite Inorganic materials 0.000 claims description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 239000010457 zeolite Substances 0.000 claims description 4
- 235000005273 Canna coccinea Nutrition 0.000 claims description 3
- 240000008555 Canna flaccida Species 0.000 claims description 3
- 241001633663 Iris pseudacorus Species 0.000 claims description 3
- 244000273256 Phragmites communis Species 0.000 claims description 3
- 235000014676 Phragmites communis Nutrition 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 240000001398 Typha domingensis Species 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 13
- 239000003344 environmental pollutant Substances 0.000 description 9
- 231100000719 pollutant Toxicity 0.000 description 9
- 239000012528 membrane Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 241000233948 Typha Species 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 208000014451 palmoplantar keratoderma and congenital alopecia 2 Diseases 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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- 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
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- 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
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Abstract
本发明公开了一种污水处理厂二级出水的潜流人工湿地系统及其应用，包括潜流人工湿地装置，潜流人工湿地装置的进水侧和出水侧分别设有过水花墙，过水花墙设有渗水孔，两侧的过水花墙之间设有湿地基质和湿地植物，潜流人工湿地装置的底部设有底部人工曝气装置；进水侧的过水花墙外部设有预曝气装置，出水侧的过水花墙外部设有集水装置；进水侧设有高位水箱，高位水箱的水平位置高于所述预曝气装置和潜流人工湿地装置，高位水箱通过进水管与所述预曝气装置连通。结构简单、低能耗、低成本、脱氮除磷效率高、占地面积小、运行管理方便、取样方便等优点。尤其适合于城镇污水处理厂二级出水的处理，也适合其他微污染水的处理。
The invention discloses an underflow artificial wetland system for secondary water outlet of a sewage treatment plant and its application, comprising an underflow artificial wetland device, the water inlet side and the water outlet side of the underflow artificial wetland device are respectively provided with water flower walls, and the water flower wall is provided with Wetland substrate and wetland plants are installed between the water flower walls on both sides of the water seepage hole, and the bottom artificial aeration device is installed at the bottom of the subsurface flow artificial wetland device; a pre-aeration device is installed outside the water flower wall on the water inlet side, and A water collecting device is provided on the outside of the splash wall; a high-level water tank is provided on the water inlet side, and the horizontal position of the high-level water tank is higher than the pre-aeration device and the subsurface artificial wetland device. connected. It has the advantages of simple structure, low energy consumption, low cost, high efficiency of nitrogen and phosphorus removal, small footprint, convenient operation and management, and convenient sampling. It is especially suitable for the treatment of the secondary effluent of urban sewage treatment plants, and also suitable for the treatment of other slightly polluted water.
Description
技术领域 technical field
本发明涉及一种水处理技术，尤其涉及一种污水处理厂二级出水的潜流人工湿地系统及其应用。The invention relates to a water treatment technology, in particular to an underflow artificial wetland system for secondary outlet water of a sewage treatment plant and its application.
背景技术 Background technique
城镇污水处理厂二级处理虽然在很大程度上对污水中的各类污染物质有所削减，但出水中N、P等污染物的相对浓度依然很高，而且C/N较低。当这些污染物伴随着污水厂出水进入受纳水体后，很容易造成受纳水体的富营养化。Although the secondary treatment of urban sewage treatment plants has reduced various pollutants in the sewage to a large extent, the relative concentration of N, P and other pollutants in the effluent is still high, and the C/N is low. When these pollutants enter the receiving water body along with the effluent from the sewage plant, it is easy to cause eutrophication of the receiving water body.
现有技术中，城镇污水处理厂深度处理工艺，应用广泛的主要有膜生物反应器(MBR)工艺、曝气生物滤池(BAF)工艺及CASS工艺等，存在工艺落后，基建投资大，运行成本高，处理后的水质不理想等缺点。膜生物反应器(MBR)工艺，系统需氧量大、能耗高，难生物降解物质的积累容易造成微生物的毒害和膜的污染，且膜组件价格目前比较昂贵；曝气生物滤池(BAF)工艺，系统启动速度慢，反冲洗过程中容易造成生物膜脱落，而且运行管理较复杂；CASS工艺，虽然工艺流程简单，但生物脱氮除磷效率难以提高，而且控制方式较为单一。In the prior art, the advanced treatment processes of urban sewage treatment plants mainly include membrane bioreactor (MBR) process, biological aerated filter (BAF) process and CASS process, etc., which are backward in process, large in infrastructure investment, and difficult to operate. High cost, unsatisfactory water quality after treatment and other disadvantages. Membrane bioreactor (MBR) process, the system has a large oxygen demand and high energy consumption, and the accumulation of refractory biodegradable substances is likely to cause microbial poisoning and membrane pollution, and the price of membrane modules is currently relatively expensive; biological aerated filter (BAF ) process, the system start-up speed is slow, the biofilm is likely to fall off during the backwashing process, and the operation management is more complicated; the CASS process, although the process is simple, but the efficiency of biological nitrogen and phosphorus removal is difficult to improve, and the control method is relatively simple.
发明内容 Contents of the invention
本发明的目的是提供一种结构简单、低能耗、低成本、脱氮除磷效率高、占地面积小、运行管理方便、取样方便的污水处理厂二级出水的潜流人工湿地系统。The purpose of the present invention is to provide an underflow constructed wetland system for the secondary effluent of sewage treatment plants with simple structure, low energy consumption, low cost, high efficiency of nitrogen and phosphorus removal, small footprint, convenient operation and management, and convenient sampling.
本发明的目的是通过以下技术方案实现的：The purpose of the present invention is achieved through the following technical solutions:
本发明的污水处理厂二级出水的潜流人工湿地系统，包括潜流人工湿地装置，所述潜流人工湿地装置的进水侧和出水侧分别设有过水花墙，所述过水花墙设有渗水孔，两侧的过水花墙之间设有湿地基质和湿地植物，所述潜流人工湿地装置的底部设有底部人工曝气装置；The subsurface flow constructed wetland system for the secondary water outlet of the sewage treatment plant of the present invention includes a subsurface flow constructed wetland device, the water inlet side and the water outlet side of the subsurface flow constructed wetland device are respectively provided with water splash walls, and the water splash walls are provided with seepage holes , a wetland substrate and wetland plants are arranged between the water flower walls on both sides, and a bottom artificial aeration device is arranged at the bottom of the subsurface flow constructed wetland device;
所述进水侧的过水花墙外部设有预曝气装置，出水侧的过水花墙外部设有集水装置；A pre-aeration device is provided outside the spray wall on the water inlet side, and a water collection device is provided outside the spray wall on the water outlet side;
所述进水侧设有高位水箱，所述高位水箱的水平位置高于所述预曝气装置和潜流人工湿地装置，所述高位水箱通过进水管与所述预曝气装置连通。The water inlet side is provided with a high-level water tank, and the horizontal position of the high-level water tank is higher than the pre-aeration device and the subsurface constructed wetland device, and the high-level water tank is communicated with the pre-aeration device through a water inlet pipe.
本发明的上述的污水处理厂二级出水的潜流人工湿地系统的应用，该方法用于北方冬季污水处理，采用预曝气及湿地底部间歇曝气实现脱氮除磷。The application of the above-mentioned subsurface flow artificial wetland system of the secondary effluent of the sewage treatment plant of the present invention is used for sewage treatment in northern winter, and nitrogen and phosphorus are removed by pre-aeration and intermittent aeration at the bottom of the wetland.
由上述本发明提供的技术方案可以看出，本发明所述的污水处理厂二级出水的潜流人工湿地系统及其应用，由于其采用了预曝气及人工曝气装置，其对所述污水的处理效果，特别是北方冬季处理效果显著提高，避免了传统人工湿地中出现的冬季处理效果不明显的缺点；其次，由于其结构简单及一体式设计，因此其运行管理方便且占地面积小，避免了传统人工湿地占地面积比较大的缺点。能在较长时间内处理效果良好，因此其污染物去除效率高，并能在一定程度上缓解了湿地堵塞问题。尤其适合于城镇污水处理厂二级出水的处理，也适合其他微污染水的处理。As can be seen from the above-mentioned technical solutions provided by the present invention, the subsurface flow artificial wetland system and its application of the secondary effluent of the sewage treatment plant described in the present invention, because it has adopted a pre-aeration and artificial aeration device, it has no effect on the described sewage The treatment effect, especially the treatment effect in winter in the north is significantly improved, avoiding the shortcomings of the traditional artificial wetland that the winter treatment effect is not obvious; secondly, due to its simple structure and integrated design, it is convenient for operation and management and occupies a small area , avoiding the shortcomings of traditional constructed wetlands that occupy a relatively large area. It can treat well for a long time, so its pollutant removal efficiency is high, and it can alleviate the problem of wetland blockage to a certain extent. It is especially suitable for the treatment of the secondary effluent of urban sewage treatment plants, and also suitable for the treatment of other slightly polluted water.
附图说明 Description of drawings
图1为本发明的潜流人工湿地系统的结构示意图；Fig. 1 is the structural representation of subsurface flow constructed wetland system of the present invention;
图2为图1的俯视图。FIG. 2 is a top view of FIG. 1 .
具体实施方式 Detailed ways
本发明的污水处理厂二级出水的潜流人工湿地系统，其较佳的具体实施方式如图1、图2所示：The subsurface flow constructed wetland system of the secondary water outlet of the sewage treatment plant of the present invention, its preferred specific implementation is shown in Figure 1 and Figure 2:
包括潜流人工湿地装置，所述潜流人工湿地装置的进水侧和出水侧分别设有过水花墙，所述过水花墙设有渗水孔，两侧的过水花墙之间设有湿地基质和湿地植物，所述潜流人工湿地装置的底部设有底部人工曝气装置；It includes a subsurface flow constructed wetland device, the water inlet side and the water outlet side of the subsurface flow constructed wetland device are respectively provided with water flower walls, the water flower walls are provided with seepage holes, and wetland matrix and wetland are arranged between the water flower walls on both sides. For plants, the bottom of the subsurface constructed wetland device is provided with a bottom artificial aeration device;
所述进水侧的过水花墙外部设有预曝气装置，出水侧的过水花墙外部设有集水装置；A pre-aeration device is provided outside the spray wall on the water inlet side, and a water collection device is provided outside the spray wall on the water outlet side;
所述进水侧设有高位水箱，所述高位水箱的水平位置高于所述预曝气装置和潜流人工湿地装置，所述高位水箱通过进水管与所述预曝气装置连通。The water inlet side is provided with a high-level water tank, and the horizontal position of the high-level water tank is higher than the pre-aeration device and the subsurface constructed wetland device, and the high-level water tank is communicated with the pre-aeration device through a water inlet pipe.
所述的预曝气装置为箱体结构，在装置底部设置有曝气管，所述曝气管连接有曝气机，所述预曝气装置与潜流人工湿地装置的体积比为1/12-1/8。The pre-aeration device is a box structure, an aeration tube is arranged at the bottom of the device, and the aeration tube is connected with an aerator, and the volume ratio of the pre-aeration device to the subsurface flow constructed wetland device is 1/12 -1/8.
所述过水花墙为两个穿孔板之间填充有砾石填充物的实体结构。The splash wall is a solid structure filled with gravel filler between two perforated plates.
所述底部人工曝气装置包括一组平行的间隔曝气管，所述曝气管连接有曝气机。The bottom artificial aeration device includes a group of parallel spaced aeration pipes, and the aeration pipes are connected with an aerator.
所述湿地基质的下层为3-8cm粒径的砾石层；中间层为1-5mm粒径的滤料基质，包括火山岩、石灰石、粉煤灰、沸石中的一种或多种；最上层为当地粘土。The lower layer of the wetland matrix is a gravel layer with a particle size of 3-8cm; the middle layer is a filter matrix with a particle size of 1-5mm, including one or more of volcanic rock, limestone, fly ash, and zeolite; the uppermost layer is local clay.
所述湿地植物包括芦苇、香蒲、美人蕉、黄花鸢尾中的一种或多种。The wetland plants include one or more of reeds, cattails, cannas, and yellow iris.
所述湿地植物的的种植密度为15-20株/m2 The planting density of the wetland plants is 15-20 plants/m 2
所述集水装置包括集水箱，所述集水箱在不同高度设有多个取样阀门，所述集水装置与潜流人工湿地装置的体积比为1/12-1/10。The water collection device includes a water collection box, and the water collection box is provided with a plurality of sampling valves at different heights, and the volume ratio of the water collection device to the subsurface constructed wetland device is 1/12-1/10.
本发明的上述的污水处理厂二级出水的潜流人工湿地系统的应用，该方法用于北方冬季污水处理，采用预曝气及湿地底部间歇曝气实现脱氮除磷。The application of the above-mentioned subsurface flow artificial wetland system of the secondary effluent of the sewage treatment plant of the present invention is used for sewage treatment in northern winter, and nitrogen and phosphorus are removed by pre-aeration and intermittent aeration at the bottom of the wetland.
系统的进水负荷为0.6-1.2m3/(m2·d)。The water intake load of the system is 0.6-1.2m 3 /(m 2 ·d).
本发明也可以用于其它地区和季节的污水处理。The invention can also be used for sewage treatment in other regions and seasons.
本发明的潜流人工湿地系统，污水在经过预曝气后，再经过潜流人工湿地，能得到达到《地表水环境质量标准(GB3838-2002)》III类标准的清水。结构简单、低能耗、低成本、脱氮除磷效率高、占地面积小、运行管理方便、取样方便，主要用于处理城镇污水处理厂二级出水。In the subsurface flow constructed wetland system of the present invention, after pre-aeration, the sewage passes through the subsurface flow constructed wetland to obtain clean water meeting the Class III standard of "Surface Water Environmental Quality Standard (GB3838-2002)". Simple structure, low energy consumption, low cost, high nitrogen and phosphorus removal efficiency, small footprint, convenient operation and management, and convenient sampling. It is mainly used to treat the secondary effluent of urban sewage treatment plants.
具体实施例：Specific examples:
如图1、图2所示，本发明的潜流人工湿地系统，是让污水在经过预曝气后，再经过潜流人工湿地，在进水负荷为0.6-1.2m3/(m2·d)范围内，得到达到《地表水环境质量标准(GB3838-2002)》III类标准的清水。As shown in Figure 1 and Figure 2, the subsurface flow constructed wetland system of the present invention allows the sewage to pass through the subsurface flow constructed wetland after pre-aeration, when the influent load is 0.6-1.2m 3 /(m 2 ·d) Within the scope, clear water that meets the Class III standard of "Surface Water Environmental Quality Standard (GB3838-2002)" is obtained.
本发明的预曝气装置是一个箱体结构，在箱体的底部设置有一个连接曝气机的曝气管，曝气管上均匀地打有直径相同的小孔。预曝气装置与潜流人工湿地装置的体积比为1/12-1/8，圆管内径8-12mm，圆管上小孔孔径为2-4mm。根据需要，曝气机可以选择适合的型号。The pre-aeration device of the present invention is a box structure, and an aeration pipe connected to an aerator is arranged at the bottom of the box, and small holes with the same diameter are evenly punched on the aeration pipe. The volume ratio of the pre-aeration device and the subsurface constructed wetland device is 1/12-1/8, the inner diameter of the circular tube is 8-12mm, and the diameter of the small holes on the circular tube is 2-4mm. According to the needs, the aerator can choose the appropriate model.
本发明的潜流湿地装置与预曝气装置为一体式结构，且在湿地内部填充有不同粒径、不同厚度的各种滤料基质，如砾石、火山岩、石灰石、粉煤灰、沸石及粘土等。底部为砾石层，最上层为粘土层。The subsurface flow wetland device and the pre-aeration device of the present invention have an integrated structure, and various filter matrices of different particle sizes and thicknesses are filled inside the wetland, such as gravel, volcanic rock, limestone, fly ash, zeolite and clay, etc. . The bottom layer is gravel, and the uppermost layer is clay layer.
本发明中，基质粒径为0.2-8cm。下层砾石层填充有粒径为3-8cm；根据需要，中间层填充有粒径为1-5mm的滤料基质，包括火山岩、石灰石、粉煤灰、沸石等，并根据具体情况进行混合填充或正反粒径填铺；最上层填充当地粘土。In the present invention, the matrix particle size is 0.2-8cm. The lower gravel layer is filled with a particle size of 3-8cm; as required, the middle layer is filled with a filter matrix with a particle size of 1-5mm, including volcanic rock, limestone, fly ash, zeolite, etc., and mixed filling or Front and back particle size filling; the top layer is filled with local clay.
本发明中，芦苇、香蒲、美人蕉、黄花鸢尾等适合北方地区的湿地植物被应用于该湿地中。湿地栽种的植物采用密植方式以提高处理效果，几种植物的种植密度为15-20株/m2。根据需要，也可以选择其它的种植密度。In the present invention, wetland plants suitable for northern regions such as reeds, cattails, cannas, and yellow iris are applied to the wetlands. The plants planted in the wetland are planted closely to improve the treatment effect, and the planting density of several plants is 15-20 plants/m2. Other planting densities can also be selected as required.
本发明中，在湿地箱体的侧面设有水及滤料取样孔，分别在不同滤料过水面积及滤床深度取样，分析其处理效果。取水孔孔径为8-12mm，并连接有长圆管，管上打有直径为2-4mm的小孔。滤料取样孔孔径为40-60mm。In the present invention, water and filter material sampling holes are provided on the side of the wetland box, and samples are taken at different filter material water passing areas and filter bed depths to analyze the treatment effect. The aperture of the water intake hole is 8-12mm, and is connected with a long round pipe, and the pipe is punched with a small hole with a diameter of 2-4mm. The filter material sampling hole diameter is 40-60mm.
本发明中，在箱体结构底部设有人工曝气装置，其作用在于湿地充氧及在冬季用于湿地装置保温。根据需要，在箱体底部设置一套曝气系统，其曝气装置中具体参数与预曝气装置基本相同。In the present invention, an artificial aeration device is provided at the bottom of the box structure, and its function is to oxygenate the wetland and to keep the wetland device warm in winter. According to the needs, set up an aeration system at the bottom of the tank, and the specific parameters of the aeration device are basically the same as those of the pre-aeration device.
本发明中，在湿地出水口位置设置有集水装置，并根据湿地深度，设置不同水位条件下的取样阀门。集水装置与潜流人工湿地装置的体积比为1/12-1/10。In the present invention, a water collecting device is arranged at the water outlet of the wetland, and sampling valves under different water level conditions are arranged according to the depth of the wetland. The volume ratio of the water collecting device to the subsurface flow artificial wetland device is 1/12-1/10.
该发明的较佳具体实施方式是，城镇污水处理厂二级出水，通过高位水箱自流进入预曝气系统装置，经一定时间的预曝气，然后进入潜流人工湿地装置，在湿地内经过基质的吸附作用，基质及植物根系表面的微生物作用等一系列复杂的物理、化学作用，能够有效地去除所述污水中的主要污染物，其中，对总氮和总磷的去除效果明显，特别是在较高水力负荷0.6-1.2m3/(m2·d)时，依然对污水处理效果良好。The preferred specific implementation of the invention is that the secondary effluent of the urban sewage treatment plant flows into the pre-aeration system device through the high-level water tank, and after a certain period of pre-aeration, it enters the subsurface flow constructed wetland device and passes through the substrate in the wetland. A series of complex physical and chemical actions such as adsorption, microbial action on the surface of substrates and plant roots, etc., can effectively remove the main pollutants in the sewage, among which, the removal effect on total nitrogen and total phosphorus is obvious, especially in When the higher hydraulic load is 0.6-1.2m 3 /(m 2 ·d), the sewage treatment effect is still good.
北方冬季湿地的运行处理效果一直是人工湿地研究的重点，该发明在湿地的底部设置了曝气管，既能保证湿地内一定的溶解氧浓度，又能通过冬季曝气起到一定的保温作用，提高出水中的污染物去除效果。该发明充分考虑了所需取样的位置及方式，并进行了优化设计，使取样点精确而且方便。该发明实现了对城镇污水处理厂二级出水中氨氮、总氮、总磷、COD等主要污染物的较佳处理效果。The operation and treatment effect of winter wetlands in northern China has always been the focus of artificial wetland research. This invention has installed an aeration tube at the bottom of the wetland, which can not only ensure a certain concentration of dissolved oxygen in the wetland, but also play a certain role in heat preservation through winter aeration. , Improve the removal effect of pollutants in the effluent. The invention fully considers the required sampling position and method, and optimizes the design to make the sampling point accurate and convenient. The invention achieves a better treatment effect on main pollutants such as ammonia nitrogen, total nitrogen, total phosphorus and COD in the secondary effluent of urban sewage treatment plants.
本发明具有以下优点和积极意义：The present invention has the following advantages and positive significance:
(1)充分利用人工湿地预曝气装置，提高所要处理污水中的溶解氧，为潜流人工湿地提供较佳的污染物去除生境，从而大大提高湿地的脱氮除磷效果。(1) Make full use of the constructed wetland pre-aeration device to increase the dissolved oxygen in the sewage to be treated, and provide a better pollutant removal habitat for the subsurface flow constructed wetland, thereby greatly improving the nitrogen and phosphorus removal effect of the wetland.
(2)通过湿地底部的人工曝气系统，使人工湿地在北方的冬季运行方面取得了一定的突破，使人工湿地在冬季对主要污染物的去除仍能达到较佳的效果。(2) Through the artificial aeration system at the bottom of the wetland, a certain breakthrough has been made in the winter operation of the constructed wetland in the north, so that the constructed wetland can still achieve a better effect on the removal of main pollutants in winter.
(3)该发明采用了一体式结构设计，缩小了占地面积，从而节约了成本。(3) The invention adopts an integrated structure design, which reduces the occupied area and saves the cost.
(4)运行管理方便，无需人员维护。(4) The operation and management are convenient and no personnel maintenance is required.
具体实验例：Specific experimental example:
以北方某城镇污水处理厂二级出水为原水，原水中CODcr58.9～79.6mg/l NH3-N 1.2～6.8mg/l，TN 3.2～12.5mg/l，TP1.3～5.7mg/l，经本发明处理，水力负荷为0.8m3/(m2·d)时，出水CODcr小于20mg/l，NH3-N小于1.0mg/l，TN小于1.0mg/l，TP小于0.2mg/l。经过长时间运行(六个月以上)，出水水质稳定。Taking the secondary effluent of a sewage treatment plant in the north as the raw water, the raw water COD cr 58.9～79.6mg/l NH 3 -N 1.2～6.8mg/l, TN 3.2～12.5mg/l, TP1.3～5.7mg/l , treated by the present invention, when the hydraulic load is 0.8m 3 /(m 2 ·d), the effluent COD cr is less than 20mg/l, NH 3 -N is less than 1.0mg/l, TN is less than 1.0mg/l, TP is less than 0.2mg /l. After long-term operation (more than six months), the effluent water quality is stable.
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention.
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