CN102491585B - Combined method for removing nitrate nitrogen of tail water produced by municipal sewage treatment plant - Google Patents
Combined method for removing nitrate nitrogen of tail water produced by municipal sewage treatment plant Download PDFInfo
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- CN102491585B CN102491585B CN 201110381435 CN201110381435A CN102491585B CN 102491585 B CN102491585 B CN 102491585B CN 201110381435 CN201110381435 CN 201110381435 CN 201110381435 A CN201110381435 A CN 201110381435A CN 102491585 B CN102491585 B CN 102491585B
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Abstract
The invention relates to a combined method for removing nitrate nitrogen of tail water produced by a municipal sewage treatment plant. The combined method provided by the invention comprises the following steps that tail water produced by a municipal sewage treatment plant passes through an adjustment tank and then enters into an artificial subsurface-flow wetland; nitrate nitrogen of the tail water is absorbed by a wetland plant having a strong nitrate nitrogen absorption capability; a microbe-based nitrate nitrogen denitrification process is carried out in a local anaerobic zone of the artificial subsurface-flow wetland through utilization of organic carbon sources in the municipal sewage and organic carbon sources provided by plant roots; and the tail water discharged from the artificial subsurface-flow wetland orderly passes through an anaerobic organism filter tank and an active carbon filter tank, wherein through the three-grade purification processes, nitrate nitrogen of the tail water is subjected to deep removal so that municipal tail water deep purification is realized. The combined method provided by the invention can realize replacement of different filter materials and plant wetland materials according to sewage quality characteristics and recycle requirements, has operation flexibility and can be utilized for deep purification of multiple types of polluted water.
Description
Technical field
The present invention relates to sewage treatment area, be specifically related to a kind of combined method of removing the tail water produced by municipal sewage treatment plant nitric nitrogen.
Background technology
Under the increasingly short background of current water resources, reusing sewage has become the important channel that solves shortage of water resources, and obtains extensive concern in various countries.Urban wastewater is as stable water source, if according to tail water feature advanced treatment in addition, and as carrying out reuse in the secondary water source in city, certainly will can alleviate the water crises problem that the many cities of present China face.But also there is the high problem that needs to be resolved hurrily of nitrate nitrogen content in the at present processing of urban wastewater.Very general at China's each department underground water and surface water nitrate-N pollution phenomenon, the nitrate of high-content can produce harm to HUMAN HEALTH in the water body.Because there is strict restriction in China to the urban wastewater ammonia nitrogen content, therefore ammonia nitrogen content generally can reach emission standard in the water outlet, but the conversion of form just occurs in the ammonia-state nitrogen major part, change nitric nitrogen into, cause in the urban wastewater total nitrogen content higher, the advanced treatment as why not in addition, directly discharging easily causes nitrate high in earth's surface and the body of groundwater.Therefore be necessary to explore an economy for the nitric nitrogen of high-content in the tail water, effectively combination treatment method.
Summary of the invention
The objective of the invention is the deficiency for solving the problems of the technologies described above, a kind of combined method of removing the tail water produced by municipal sewage treatment plant nitric nitrogen is provided, when removing in the urban wastewaters nitric nitrogen by three grades of degree of depth, play the deep purifying of urban wastewater.
The present invention is the deficiency that solves the problems of the technologies described above, and the technical scheme that adopts is: a kind of combined method of removing the tail water produced by municipal sewage treatment plant nitric nitrogen said method comprising the steps of:
(1), pending tail water produced by municipal sewage treatment plant is introduced first equalizing tank, carrying out the water yield regulates, the sewage of drawing from equalizing tank enters subsurface flow wetland system, subsurface flow wetland system is artificial current wetland, sewage enters artificial current wetland by water distributor, and artificial current wetland is provided with clay waterproof layer, metalling and pedosphere from top to bottom successively; Wherein the height of clay waterproof layer is 1/8 of artificial current wetland height; Metalling is that the metaling of 1～2cm consists of by particle diameter, and it highly is 1/4 of artificial current wetland height; Pedosphere is made of sandy soil, and it highly is 5/8 of artificial swamp height; Plant on the pedosphere and be implanted with wetland plant; Water distributor is arranged on edaphic mid-way, according to the residence time of water quality condition sewage in artificial current wetland be 2～3 days; A part of nitric nitrogen in artificial current wetland in the sewage is absorbed by wetland plant, and the denitrification of wetland also can be removed a part of nitric nitrogen in addition;
(2), introduce again anaerobic biofilter through the sewage of artificial current wetland, anaerobic biofilter is the flow lifting type anaerobic biofilter, the bottom of anaerobic biofilter is provided with water-in, body top, pond is provided with rising pipe, the water inlet is provided with the cloth hydroecium, the top of cloth hydroecium is provided with two-layer sieve plate, be provided with supporting layer between the two-layer sieve plate, supporting layer is made of cobble, it highly is 1/12 of whole filter tank height, sieve plate top is provided with packing layer, and packing layer is made of fibrous nodules, and it highly is 2/3 of whole filter tank height; Sewage enters from anaerobic biofilter bottom and flows through successively cloth hydroecium, supporting layer and packing layer and then discharge from the top rising pipe, be 3～4 days according to water quality condition sewage in the anaerobic biofilter residence time, the denitrification in the anaerobic biofilter is further except the part nitric nitrogen in the decontaminated water;
(3), finally enter the activated carbon filtration pond through the sewage of anaerobic biofilter, be filled with modification fruit stone gac in the activated carbon filtration pond, modification fruit stone gac be the walnut fruit stone gac of usefulness zinc chloride activation under 500 ℃ of conditions, and particle diameter is 0.5～1mm; Sewage is 1～2 hour in the activated carbon filtration pond residence time, and the activated carbon filtration pond can be removed remaining nitric nitrogen, can remove the suspended substance in the sewage simultaneously, reduces the colourity of sewage.
Wetland plant in the described step (1) is Canna generalis Bailey, Wildcelery Herb or cattail.
The invention has the beneficial effects as follows:
(1) the present invention is with three grades of urban wastewater purification process, processing feature reasonable combination according to each technique, not only make the nitric nitrogen in its water body obtain removing comparatively thoroughly, and make the total nitrogen index of water outlet reach emission standard, to other organism in the urban wastewater, the pollutents such as suspended solid obtain synchronous purification simultaneously.
(2) the modification fruit stone gac that uses in the activated carbon filtration pond among the present invention, abrasive wear resistance is good, the space is flourishing, absorption property is high, and filter effect is better.
Embodiment
A kind of combined method of removing the tail water produced by municipal sewage treatment plant nitric nitrogen, carry out according to the following step:
(1), pending tail water produced by municipal sewage treatment plant is introduced first equalizing tank, carrying out the water yield regulates, the sewage of drawing from equalizing tank enters subsurface flow wetland system, subsurface flow wetland system is artificial current wetland, sewage enters artificial current wetland by water distributor, and artificial current wetland is provided with clay waterproof layer, metalling and pedosphere from top to bottom successively; Wherein the height of clay waterproof layer is 1/8 of artificial current wetland height; Metalling is that the metaling of 1～2cm consists of by particle diameter, and it highly is 1/4 of artificial current wetland height; Pedosphere is made of sandy soil, and it highly is 5/8 of artificial swamp height; Plant on the pedosphere and be implanted with wetland plant; Water distributor is arranged on edaphic mid-way, the sewage that enters so artificial current wetland can flow through from the root system position of wetland plant, wears under the wetland plant rhizome to be formed with to be beneficial to that microorganism is realized the aerobic zone of nitrification, the anaerobic zone around the root system, available carbon source provides again Denitrification Conditions in canebreak and the geological stratification in addition.According to the water quality situation of sewage, the residence time of sewage in artificial current wetland is about 2～3 days; A part of nitric nitrogen in the sewage is by wetland plant, and the denitrification of wetland also can be removed a part of nitric nitrogen in addition;
(2), introduce again anaerobic biofilter through the sewage of artificial current wetland, anaerobic biofilter is the flow lifting type anaerobic biofilter, the bottom of anaerobic biofilter is provided with water-in, body top, pond is provided with rising pipe, the water inlet is provided with the cloth hydroecium, the top of cloth hydroecium is provided with two-layer sieve plate, be provided with supporting layer between the two-layer sieve plate, supporting layer is made of cobble, it highly is 1/12 of whole filter tank height, sieve plate top is provided with packing layer, and packing layer is made of fibrous nodules, and it highly is 2/3 of whole filter tank height; Sewage enters from anaerobic biofilter bottom and flows through successively cloth hydroecium, supporting layer and packing layer and then discharge from the top rising pipe, the biomass major part is attached to filter material surface with biomembranous form, small part is present in the gap of filtrate with the form of anaerobic activated sludge, biomass concentration is high, the organic loading rate is higher, and load can withstand shocks.Sewage is 3～4 days in the anaerobic biofilter residence time, and the denitrification in the anaerobic biofilter is further except the part nitric nitrogen in the decontaminated water;
(3), finally enter the activated carbon filtration pond through the sewage of anaerobic biofilter, be filled with modification fruit stone gac in the activated carbon filtration pond, modification fruit stone gac be the walnut fruit stone gac of usefulness zinc chloride activation under 500 ℃ of conditions, and particle diameter is 0.5～1mm; Sewage is about 1～2 hour in the activated carbon filtration pond residence time, this modification fruit stone gac, and abrasive wear resistance is good, the space is flourishing, absorption property is high, than common activated carbon filtration better effects if.The activated carbon filtration pond can be removed remaining nitric nitrogen, can remove the suspended substance in the sewage simultaneously, reduces the colourity of sewage.
The preferred Canna generalis Bailey of wetland plant, Wildcelery Herb or cattail in the described step (1), have good economic worth and ornamental value, and these plants can increase the chance water-based of artificial current wetland, can also form various subenvironments with the protozoon of surrounding environment, microorganism etc. in addition, oxygen transmission to the root district, is formed special rhizosphere environment, this micro-ecological environment has the very strong ability of purifying liquid waste.
After urban wastewater is processed through this combination technique, not only make the nitric nitrogen in its water body obtain removing comparatively thoroughly, and make the total nitrogen index of water outlet reach emission standard, simultaneously to other organism in the urban wastewater, the pollutents such as suspended solid obtain synchronous purification, make water outlet can reach higher reuse target.The method is according to removing the needs of nitric nitrogen, and three grades of processing arrangements that adopt are reasonable, realize synchronously the recycling of Nutrients in the sewage, for the polluted-water of other types provides advanced treatment reference method.
Below be the decontamination effect improving of method of the present invention:
Example one:
Before the processing: a kind of to urban wastewater, main pollutant consistence is: nitric nitrogen 20～40 mg/L, and ammonia nitrogen content 5～10 mg/L, phosphorus concentration are below the 3mg/L, and COD concentration is 20～40mg/L, and SS concentration is 20～30 mg/L.
After the processing: nitrate is less than 1 mg/L, and the ammonia nitrogen attitude is less than 0.2 mg/L, and total phosphorus concentration is less than 0.2 mg/L, and COD is less than 10mg/L, and SS is less than 0.5 mg/L.
Install normal operation in the treating processes, the wetland plant well-grown, the biological filter is without latch up phenomenon.Each index effluent quality is better than " water environment quality standard " (GB3838-2002) III class water quality standard.
Example two:
Before the processing: a kind of tail water that reaches urban wastewater treatment firm pollutant emission one-level A standard, main pollutant consistence is: nitrate 10～20, total nitrogen concentration are 15～20 mg/L, and total phosphorus concentration is 1～1.5 mg/L, COD is 30～40 mg/L, and SS is 10～20 mg/L.
After the processing: nitrate is less than 0.2 mg/L, and the ammonia nitrogen attitude is less than 0.1 mg/L, and total phosphorus concentration is less than 0.1mg/L, and COD is less than 7mg/L, and SS is less than 0.5 mg/L.
Install normal operation in the treating processes, the wetland plant well-grown, the biological filter is without latch up phenomenon.Each index effluent quality is better than " water environment quality standard " (GB3838-2002) II class water quality standard.
Claims (2)
1. combined method of removing the tail water produced by municipal sewage treatment plant nitric nitrogen is characterized in that: said method comprising the steps of:
(1), pending tail water produced by municipal sewage treatment plant is introduced first equalizing tank, carrying out the water yield regulates, the sewage of drawing from equalizing tank enters subsurface flow wetland system, subsurface flow wetland system is artificial current wetland, sewage enters artificial current wetland by water distributor, and artificial current wetland is provided with clay waterproof layer, metalling and pedosphere from top to bottom successively; Wherein the height of clay waterproof layer is 1/8 of artificial current wetland height; Metalling is that the metaling of 1～2cm consists of by particle diameter, and it highly is 1/4 of artificial current wetland height; Pedosphere is made of sandy soil, and it highly is 5/8 of artificial swamp height; Plant on the pedosphere and be implanted with wetland plant; Water distributor is arranged on edaphic mid-way, the residence time of sewage in artificial current wetland is 2～3 days, a part of nitric nitrogen in artificial current wetland in the sewage is absorbed by wetland plant, and the denitrification of wetland also can be removed a part of nitric nitrogen in addition;
(2), introduce again anaerobic biofilter through the sewage of artificial current wetland, anaerobic biofilter is the flow lifting type anaerobic biofilter, the bottom of anaerobic biofilter is provided with water-in, body top, pond is provided with rising pipe, the water inlet is provided with the cloth hydroecium, the top of cloth hydroecium is provided with two-layer sieve plate, be provided with supporting layer between the two-layer sieve plate, supporting layer is made of cobble, it highly is 1/12 of whole filter tank height, sieve plate top is provided with packing layer, and packing layer is made of fibrous nodules, and it highly is 2/3 of whole filter tank height; Sewage enters from anaerobic biofilter bottom and flows through successively cloth hydroecium, supporting layer and packing layer and then discharge from the top rising pipe, sewage is 3～4 days in the anaerobic biofilter residence time, and the denitrification in the anaerobic biofilter can be further except the part nitric nitrogen in the decontaminated water;
(3), the sewage of processing through anaerobic biofilter finally enters the activated carbon filtration pond, be filled with modification fruit stone gac in the activated carbon filtration pond, modification fruit stone gac is the walnut fruit stone gac of using zinc chloride activation under 500 ℃ of conditions, and particle diameter is 0.5～1mm; Sewage is 1～2 hour in the activated carbon filtration pond residence time, and the activated carbon filtration pond can be removed remaining nitric nitrogen, can remove the suspended substance in the sewage simultaneously, reduces the colourity of sewage.
2. a kind of combined method of removing the tail water produced by municipal sewage treatment plant nitric nitrogen according to claim 1, it is characterized in that: the wetland plant in the described step (1) is Canna generalis Bailey, Wildcelery Herb or cattail.
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| CN104056601A (en) * | 2014-06-26 | 2014-09-24 | 常州大学 | Preparation method for adsorption material for removing low-concentration ammonia nitrogen from micro-polluted water |
| CN110228909A (en) * | 2019-06-26 | 2019-09-13 | 生态环境部南京环境科学研究所 | A kind of Man-made wetland coupling ecological filter circulating treating system and processing method |
| CN110294531A (en) * | 2019-07-04 | 2019-10-01 | 南京领先环保技术股份有限公司 | A kind of water treatment system and method based on ecological core wetland |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MXPA01001811A (en) * | 2001-02-15 | 2005-04-28 | Antonio Castellanos Rold Marco | Wetlands system (underground flow artificial swamps). |
| US7128839B1 (en) * | 2004-03-05 | 2006-10-31 | Flowers David A | Process and system for enhanced nitrogen removal in a wetland and recirculating sand filter wastewater treatment system |
| CN101643290A (en) * | 2008-08-07 | 2010-02-10 | 中冶赛迪工程技术股份有限公司 | Sewage treatment method |
| CN101857336A (en) * | 2010-01-25 | 2010-10-13 | 安徽鲁班建设投资集团有限公司 | Water recycling circulating system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MXPA01001811A (en) * | 2001-02-15 | 2005-04-28 | Antonio Castellanos Rold Marco | Wetlands system (underground flow artificial swamps). |
| US7128839B1 (en) * | 2004-03-05 | 2006-10-31 | Flowers David A | Process and system for enhanced nitrogen removal in a wetland and recirculating sand filter wastewater treatment system |
| CN101643290A (en) * | 2008-08-07 | 2010-02-10 | 中冶赛迪工程技术股份有限公司 | Sewage treatment method |
| CN101857336A (en) * | 2010-01-25 | 2010-10-13 | 安徽鲁班建设投资集团有限公司 | Water recycling circulating system |
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