CN102757161A - Low-carbon double-effect nitrogen removing sewage treatment system and process - Google Patents
Low-carbon double-effect nitrogen removing sewage treatment system and process Download PDFInfo
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Abstract
Disclosed are a low-carbon double-effect nitrogen removing sewage treatment system and a process. The system comprises a coarse screen lifting pump station, an adjusting-regeneration-adsorption tank and a fine screen which sequentially pre-treat sewage. The system is characterized by comprising a first low temperature catalytic oxidation device, a stewing oxidation and active mud film layer tank, a sludge storage tank, a hydrolysis acidification tank, an anoxic/oxic (A/O) tank, a secondary sedimentation tank, a second low temperature catalytic oxidation device, a stewing oxidation and thickening machine, an ultra-filtration (UF) system and a reverse osmosis (RS) treatment system. According to the low-carbon double-effect nitrogen removing sewage treatment system, when denitrification is required, by means of a relative high concentration technology, carbon sources in the sewage are enriched so as to meet denitrification basic requirements of high concentration carbon sources and high nitrate and nitrite; the carbon sources in the sludge contained in the sewage are released and used as supplement carbon sources; and substances which are toxic to organisms are rich in the carbon sources, and the toxicant substances are subjected to chain scission and micro-molecularization to achieve carbon source supplement. According to the low-carbon double-effect nitrogen removing sewage treatment system and the process, the problem of low-carbon high-nitrogen sewage treatment is solved.
Description
Technical field
The present invention relates to a kind of Sewage treatment systems and technology, especially guarantee ammonia nitrogen total nitrogen treatment system and the technology up to standard in the waste water time up to standard for satisfying COD after the low-carbon high-nitrogen wastewater treatment.
Background technology
Current domestic and international water technology development is very fast; But quickening along with industrial process; Certain variation has also appearred in the water quality of discharge of wastewater; Low-carbon (LC) waste water (refer to certain carbon source is arranged because the toxicity of waste water is remarkable to biotic influence, and carbon being disabled consumption in the waste water because the technology thinking causes) is increasing.The use of a large amount of chemical fertilizer and the contradiction characteristic of nitration denitrification and dephosphorization technology, cause wastewater treatment often COD be up to state standards, but its ammonia nitrogen concentration and total nitrogen concentration still exceed standard.It also is the major cause of body eutrophication.Therefore be necessary to develop a kind of technology, make this technology and existing water quality characteristic interface, satisfy COD the time up to standard, guarantee that the ammonia section total nitrogen in the waste water is up to standard.
But several contradiction points that existing water technology exists:
Current water treatment basic technology is that (the A2O method is claimed the AAO method again to A2O technology, is first alphabetical abbreviation (anaerobic-anoxic-aerobic method) of English Anaerobic-Anoxic-Oxic, is a kind of commonly used
Sewage treatment process, can be used for B-grade sewage and handle or three grades of WWTs, and middle water reuse, have good denitrogenation dephosphorizing effect), all sewage treatment process are all regarded different wastewater characteristics as, the mutation of this technology that develops.Accomplish the SBR technology (abbreviation of Sequencing Batch Reactor: be called sequencing batch active sludge or intermittent activated sludge process again) of wastewater treatment such as single pond body; Strengthen the to reflux oxidation ditch and the different ditch type of control, for guarantee the living weight exploitation based on this technology biomembrance process.And for guaranteeing the membrane technique technology of water outlet.
Its distinguishing feature is the mutual contradiction of denitrogenation and dephosphorization.To low-carbon high-nitrogen waste water, needing supplementary carbon source to accomplish increases running cost.To containing carbon source but the high waste water of bio-toxicity can't effectively utilize wherein carbon.Adopt electrolysis in the iron carbon, increase iron consumption and also can't solve blockage problem, adopt the Fenton oxidation to increase pharmaceutical quantities two and transfer PH to increase working cost increase sludge yield.Electrooxidation technology causes a large amount of invalid energy expenditures of waste water.Current Chinese industrial high speed development, the low-carbon (LC) high ammonia-nitrogen wastewater of waste water exists in a large number, and national standard only limits ammonia nitrogen at present, and to the total nitrogen less-restrictive, therefore following water Pollution norms are bound to total nitrogen is carried out strict requirement.Be fully recognized that ammonia nitrogen, kjeldahl nitrogen, inorganic nitrogen, total nitrogen person concern particularly important.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the object of the present invention is to provide a kind of low-carbon (LC) economic benefits and social benefits denitrogenation Sewage treatment systems and technology.
This technology is to the economic benefits and social benefits treatment process of the minimal path of the higher waste water of ammonia nitrogen, total nitrogen, TKN.And the characteristics of such waste water of emphasis consideration, carbon source concentration is lower generally speaking, and generally its carbon source does not possess toxicity by biological utilisation or to biology, and the insufficient situation proposition of denitrifying carbon source.
Its technical scheme based on design following:
The characteristics of low-carbon (LC) waste water are that carbon source is low or cannot be by biological utilisation; The one, need the denitrification stage through relative high density technology with the carbon source enrichment in the waste water; Satisfy the carbon source that denitrifying pacing items is a high density, high nitrate radical and nitrite anions.Second section is that the carbon source that waste water produces in the mud discharges, as supplementary carbon source, and the 3rd, it is to realize through chain rupture and small moleculesization to toxicant that the virose material of biology is rich in a large amount of carbon sources, carbon source is replenished.
Secondly: solving organonitrogen TKN and the quick nitrated of ammonia nitrogen in the water is prerequisite, and nitrated horse back afterwards gets into high reactivity sludge age layer and carries out the high-carbon denitrification.
Connect external ultrafiltration system realization reuse or discharging after utilizing common process to accomplish rearmounted A/O, second nitrification and denitrification.
For realizing above-mentioned purpose and based on above-mentioned design:
Low-carbon (LC) economic benefits and social benefits denitrogenation Sewage treatment systems provided by the invention comprises that successively sewage being carried out pretreated coarse rack promotes pumping plant, adjusting-regeneration-adsorption tank, fine fack; Also comprise:
The first low-temperature catalytic oxidation device is provided with sewage input terminus, sewage output terminal, and this sewage input terminus is communicated with the sewage output terminal of said fine fack through sewer pipeline;
Leave standstill oxidation and active mud rete pond, be provided with sewage input terminus, technology startup bacterial classification input terminus, sewage output terminal, excess sludge output terminal; This sewage input terminus is communicated with the sewage output terminal of the said first low-temperature catalytic oxidation device through sewer pipeline; Technology starts the bacterial classification input terminus and is communicated with technology startup bacterial classification generation device through the dosing pipeline;
Mud storage pond is provided with excess sludge input terminus, excess sludge output terminal, and this excess sludge input terminus leaves standstill oxidation and is communicated with the excess sludge output terminal in active mud rete pond with said through the excess sludge pipeline; This excess sludge output terminal is communicated with sludge dehydration device through the excess sludge pipeline;
Hydrolysis acidification pool and A/O pond are provided with sewage input terminus, air input terminus, returned sluge input terminus, sewage output terminal; This sewage input terminus leaves standstill oxidation and is communicated with the sewage output terminal in active mud rete pond with said through sewer pipeline; This air input terminus is communicated with air-blast device through air line;
Second pond; Be provided with sewage input terminus, returned sluge output terminal, sewage output terminal; This sewage input terminus is connected with the sewage output terminal in said hydrolysis acidification pool and A/O pond through sewer pipeline, and this returned sluge output terminal is communicated with the returned sluge input terminus in returned sluge input terminus, hydrolysis acidification pool and the A/O pond of adjusting-regeneration-adsorption tank through return sludge line, return sludge pump;
The second low-temperature catalytic oxidation device is provided with sewage input terminus, sewage output terminal; This sewage input terminus is communicated with the sewage output terminal of second pond through sewer pipeline;
Static oxidation and thickener; Be provided with sewage input terminus, sewage output terminal, returned sluge output terminal; This sewage input terminus is communicated with the sewage output terminal of the said second low-temperature catalytic oxidation device through sewer pipeline, and this returned sluge output terminal is communicated with the returned sluge input terminus of adjusting-regeneration-adsorption tank through return sludge line;
The sewage output terminal of static oxidation and thickener is connected with intermediate pool, UF filtering system, RO suction sump, RO treatment system in turn backward through sewer pipeline;
But said RO treatment system is provided with reuse water output terminal, sewage output terminal, but should be communicated with reuse pool through the reuse water pipeline by the reuse water output terminal; This sewage output terminal is communicated with the sewage input terminus in dense pond through sewer pipeline, and the sewage output terminal in dense pond is communicated to the sewage input terminus of the described first low-temperature catalytic oxidation device through sewer pipeline.
Low-carbon (LC) economic benefits and social benefits denitrification sewage treatment process provided by the invention, its step comprises:
A), the pre-treatment that utilizes coarse rack lifting pumping plant, adjusting-regeneration-adsorption tank, fine fack that sewage is carried out;
B), in the first low-temperature catalytic oxidation device, utilize wet catalysis technology to produce the great amount of hydroxy group radical, the part of accomplishing the nitrated and organonitrogen of ammonia-state nitrogen in the waste water is nitrated; And to show as in the deleterious material in the waste water TOC not by the carbon source of biological utilisation, utilize hydroxyl radical free radical that the organism effect in the sewage is generated the micromolecular carbon source that can directly be utilized by biology, realize that waste water does not have to poison to handle and carbon source discharges;
C), in leaving standstill oxidation and active mud rete pond, sewage carries out the carbon source enrichment through active mud rete, and under high sludge age condition, realizes the one-level denitrification;
D), in hydrolysis acidification pool and A/O pond, handle through hydrolysis, A/O and to carry out second nitrification and denitrification denitrogenation, realize under the low-carbon (LC) condition that two imitate denitrogenations;
E), hydrolysis acidification pool and the A/O pond sewage after handling gets into second pond, the mud 100% in the second pond is back to adjusting-regeneration-adsorption tank, hydrolysis acidification pool and A/O pond; Get in adjustings-regeneration-adsorption tank returned sluge and again in the first low-temperature catalytic oxidation device hydroxyl oxidize make the release of cell walls content, the realization carbon source is utilized again;
F), by the sewage of second pond output again through the second low-temperature catalytic oxidation device, further utilize hydroxyl that oxidation operation effect in the waste water is realized that carbon source discharges;
G), again through static oxidation and thickener, carry out further hydroxyl oxidize and realize the degraded of COD and separating of suspended substance through selective active mud rete; And realized the selective active mud rete of the renewal of cyclic regeneration;
H), sewage again after the processing of UF filtering system, RO treatment system, the water of recyclable utilization gets into reuse pool, the water that can not recycle flow in the first low-temperature catalytic oxidation device again, carries out next round-robin and handles.
In above-mentioned technology, preferred: in the said step b), in the first low-temperature catalytic oxidation device, the ratio of the corresponding ammonia nitrogen concentration of hydroxy free radical concentration is 1:2 ~ 1:6.
In step c), in leaving standstill oxidation and active mud rete pond, hydroxyl concentration is consumed to 0 mg/litre, and sludge age is controlled at 35-50 day.
Preferably: two heavy surface load 0.8-2.5 cubic meters of said second pond/square metre hour.
The invention has the beneficial effects as follows: the present invention is mainly used in the problem that solves the low-carbon high-nitrogen wastewater treatment, this technology:
1, low temperature wet catalysis oxidation technology completion carbon source discharges with nitrated, produces a large amount of hydroxyl radical free radicals through wet catalysis, accomplishes the nontoxic and carbon source release of the nitrated realization waste water of part of the nitrated and organonitrogen of ammonia-state nitrogen.
2, accomplish carbon source enrichment and active high sludge age condition realization one-level denitrification through the high sludge age layer structure of mud backflow control realization.After connect the low-carbon (LC) economic benefits and social benefits denitrogenation that AO and ultrafiltration realize the industriallization stabilization.
3, be the shortest economic benefits and social benefits treatment process, two of the shortest flow process imitate the nitrification and denitrification technologies the higher waste water of ammonia nitrogen, total nitrogen, TKN.Technical process is: waste water-conventional pre-treatment-low temperature wet catalysis-high reactivity sludge age layer-A/O-ultrafiltration reuse.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further explanation:
Fig. 1 is the structural representation of the embodiment of low-carbon (LC) economic benefits and social benefits denitrogenation Sewage treatment systems among the present invention.
Among the figure: 1 coarse rack lift pump room, 2 adjusting-regeneration-adsorption tank, 3 fine facks, 4 first low-temperature catalytic oxidation devices, 5 technologies start the bacterial classification generation device, and 6 leave standstill oxidation and active mud rete pond; 7 mud storage pond, 8 sludge dehydration devices, 9 hydrolysis acidification pools and A/O pond, 10 second ponds, 11 return sludge pumps; 12 second low-temperature catalytic oxidation devices, 13 static oxidation and thickeners, 14 intermediate pool, 15UF filtering system, 16RO suction sump; The 17RO treatment system, 18 excess sludge pipelines, 19 return sludge line, 20 sewer pipelines, 21 air lines; 22 dosing pipelines, 23 reuse pools, 24 dense ponds, 25 air-blast devices, 26 reuse water pipelines.
Embodiment
Low-carbon (LC) economic benefits and social benefits denitrogenation Sewage treatment systems shown in Figure 1 comprises that successively sewage is carried out pretreated coarse rack to be promoted pumping plant 1, adjustings-regeneration-adsorption tank 2, fine fack 3, the first low-temperature catalytic oxidation device 4, technology startup bacterial classification generation device 5, leave standstill oxidation and active mud rete pond 6, mud and store up pond 7, sludge dehydration device 8, hydrolysis acidification pool and A/O pond 9, second pond 10, return sludge pump 11, the second low-temperature catalytic oxidation device 12, static oxidation and thickener 13, UF filtering system 15, RO treatment system 17.
Coarse rack lifting pumping plant 1, adjusting-regeneration-adsorption tank 2,3 pairs of sewage of fine fack carry out pre-treatment earlier.
Its first low-temperature catalytic oxidation device 4 is provided with sewage input terminus, sewage output terminal, and this sewage input terminus is communicated with the sewage output terminal of said fine fack 3 through sewer pipeline 20.
Leave standstill oxidation and active mud rete pond 6, be provided with sewage input terminus, technology startup bacterial classification input terminus, sewage output terminal, excess sludge output terminal; This sewage input terminus is communicated with the sewage output terminal of the said first low-temperature catalytic oxidation device 4 through sewer pipeline 20; This technology starts the bacterial classification input terminus and is communicated with technology startup bacterial classification generation device 5 through dosing pipeline 22.
Hydrolysis acidification pool and A/O pond 9 are provided with sewage input terminus, air input terminus, returned sluge input terminus, sewage output terminal; This sewage input terminus leaves standstill oxidation and is communicated with the sewage output terminal in active mud rete pond 6 with said through sewer pipeline 20; This air input terminus is communicated with air-blast device 25 through air line 21.
The second low-temperature catalytic oxidation device 12 is provided with sewage input terminus, sewage output terminal; This sewage input terminus is communicated with the sewage output terminal of second pond 10 through sewer pipeline 20.
Static oxidation and thickener 13; Be provided with sewage input terminus, sewage output terminal, returned sluge output terminal; This sewage input terminus is communicated with the sewage output terminal of the said second low-temperature catalytic oxidation device 12 through sewer pipeline 20, and this returned sluge output terminal is communicated with the returned sluge input terminus of adjusting-regeneration-adsorption tank 2 through return sludge line 19.
The sewage output terminal of static oxidation and thickener 13 is connected with intermediate pool 14, UF filtering system 15, RO suction sump 16, RO treatment system 17 in turn backward through sewer pipeline 20.
But said RO treatment system 17 is provided with reuse water output terminal, sewage output terminal, but should be communicated with reuse pool 23 through reuse water pipeline 26 by the reuse water output terminal; This sewage output terminal is through the sewage input terminus in the dense pond 24 of sewer pipeline 20 connections, and the sewage output terminal in dense pond 24 is communicated to the sewage input terminus of the described first low-temperature catalytic oxidation device 4 through sewer pipeline 20.
Low-carbon (LC) economic benefits and social benefits denitrification sewage treatment process provided by the invention, its step comprises:
A), the pre-treatment that utilizes coarse rack lifting pumping plant 1, adjusting-regeneration-adsorption tank 2,3 pairs of sewage of fine fack to carry out;
B), in the first low-temperature catalytic oxidation device 4, utilize wet catalysis technology to produce the great amount of hydroxy group radical, the part of accomplishing the nitrated and organonitrogen of ammonia-state nitrogen in the waste water is nitrated; And to show as in the deleterious material in the waste water TOC not by the carbon source of biological utilisation, through hydroxyl the organism effect in the sewage is generated the micromolecular carbon source that can directly be utilized by biology, realizing that waste water does not have poisons processing and carbon source release;
In this step, the corresponding ammonia nitrogen concentration of hydroxy free radical concentration under this condition, utilizes the non-selectivity of hydroxyl radical free radical to the organism effect than being 1:2～1:6, and the organism effect is generated the micromolecular carbon source that can directly be utilized by biology;
C), in leaving standstill oxidation and active mud rete pond 6, sewage carries out the carbon source enrichment through active mud rete, and under high sludge age condition, realizes the one-level denitrification;
Preferably, in this step c), in leaving standstill oxidation and active mud rete pond 6, hydroxyl concentration is consumed to 0 mg/litre, and sludge age is controlled at 35-50 day;
D), in hydrolysis acidification pool and A/O pond 9, handle through hydrolysis, A/O and to carry out second nitrification and denitrification denitrogenation, realize under the low-carbon (LC) condition that two imitate denitrogenations;
E), the sewage of hydrolysis acidification pool and A/O pond 9 after handling gets into second pond 10, the mud 100% in the second pond 10 are back to adjusting-regeneration-adsorption tank 2, hydrolysis acidification pool and A/O pond 9; Get in adjustings-regeneration-adsorption tank 2 returned sluge and again in the first low-temperature catalytic oxidation device 4 hydroxyl oxidize make the release of cell walls content, the realization carbon source is utilized again;
Preferably, in this step e), two heavy surface loads of said second pond 10 0.8～2.5 cubic metre/square metre hour.
F), by the sewage of second pond 10 output again through the second low-temperature catalytic oxidation device 12, further utilize hydroxyl that oxidation operation effect in the waste water is realized that carbon source discharges;
G), again through static oxidation and thickener 13, carry out further hydroxyl oxidize and realize the degraded of COD and separating of suspended substance through selective active mud rete; And realized the selective active mud rete of the renewal of cyclic regeneration;
H), sewage again after the processing of UF filtering system 15, RO treatment system 17, the water of recyclable utilization gets into reuse pool 23, the water that can not recycle flow in the first low-temperature catalytic oxidation device 4 again, carries out next round-robin and handles.
Said system and process method, realized its inventive concept:
The characteristics of low-carbon (LC) waste water are that carbon source is low or cannot be by biological utilisation; The one, need the denitrification stage through relative high density technology with the carbon source enrichment in the waste water; Satisfy the carbon source that denitrifying pacing items is a high density, high nitrate radical and nitrite anions; Second section is that the carbon source that waste water produces in the mud discharges, as supplementary carbon source; The 3rd, the virose material of biology is rich in a large amount of carbon sources, replenish through chain rupture and small molecules realization carbon source toxicant.
Secondly: solving organonitrogen TKN and the quick nitrated of ammonia nitrogen in the water is prerequisite, and nitrated horse back afterwards gets into high reactivity sludge age layer and carries out the high-carbon denitrification.
Connect external ultrafiltration system realization reuse or discharging after utilizing common process to accomplish rearmounted A/O, second nitrification and denitrification.
Claims (5)
1. low-carbon (LC) economic benefits and social benefits denitrogenation Sewage treatment systems is characterized in that: comprise that successively sewage being carried out pretreated coarse rack promotes pumping plant, adjusting-regeneration-adsorption tank, fine fack; Also comprise:
The first low-temperature catalytic oxidation device is provided with sewage input terminus, sewage output terminal, and this sewage input terminus is communicated with the sewage output terminal of said fine fack through sewer pipeline;
Leave standstill oxidation and active mud rete pond, be provided with sewage input terminus, technology startup bacterial classification input terminus, sewage output terminal, excess sludge output terminal; This sewage input terminus is communicated with the sewage output terminal of the said first low-temperature catalytic oxidation device through sewer pipeline; Technology starts the bacterial classification input terminus and is communicated with technology startup bacterial classification generation device through the dosing pipeline;
Mud storage pond is provided with excess sludge input terminus, excess sludge output terminal, and this excess sludge input terminus leaves standstill oxidation and is communicated with the excess sludge output terminal in active mud rete pond with said through the excess sludge pipeline; This excess sludge output terminal is communicated with sludge dehydration device through the excess sludge pipeline;
Hydrolysis acidification pool and A/O pond are provided with sewage input terminus, air input terminus, returned sluge input terminus, sewage output terminal; This sewage input terminus leaves standstill oxidation and is communicated with the sewage output terminal in active mud rete pond with said through sewer pipeline; This air input terminus is communicated with air-blast device through air line;
Second pond; Be provided with sewage input terminus, returned sluge output terminal, sewage output terminal; This sewage input terminus is connected with the sewage output terminal in said hydrolysis acidification pool and A/O pond through sewer pipeline, and this returned sluge output terminal is communicated with the returned sluge input terminus in returned sluge input terminus, hydrolysis acidification pool and the A/O pond of adjusting-regeneration-adsorption tank through return sludge line, return sludge pump;
The second low-temperature catalytic oxidation device is provided with sewage input terminus, sewage output terminal; This sewage input terminus is communicated with the sewage output terminal of second pond through sewer pipeline;
Static oxidation and thickener; Be provided with sewage input terminus, sewage output terminal, returned sluge output terminal; This sewage input terminus is communicated with the sewage output terminal of the said second low-temperature catalytic oxidation device through sewer pipeline, and this returned sluge output terminal is communicated with the returned sluge input terminus of adjusting-regeneration-adsorption tank through return sludge line;
The sewage output terminal of static oxidation and thickener is connected with intermediate pool, UF filtering system, RO suction sump, RO treatment system in turn backward through sewer pipeline;
But said RO treatment system is provided with reuse water output terminal, sewage output terminal, but should be communicated with reuse pool through the reuse water pipeline by the reuse water output terminal; This sewage output terminal is communicated with the sewage input terminus in dense pond through sewer pipeline, and the sewage output terminal in dense pond is communicated to the sewage input terminus of the described first low-temperature catalytic oxidation device through sewer pipeline.
2. low-carbon (LC) economic benefits and social benefits denitrification sewage treatment process is characterized in that, its step comprises:
A), the pre-treatment that utilizes coarse rack lifting pumping plant, adjusting-regeneration-adsorption tank, fine fack that sewage is carried out;
B), in the first low-temperature catalytic oxidation device, utilize wet catalysis technology to produce the great amount of hydroxy group radical, the part of accomplishing the nitrated and organonitrogen of ammonia-state nitrogen in the waste water is nitrated; And to show as in the deleterious material in the waste water TOC not by the carbon source of biological utilisation, utilize hydroxyl radical free radical that the organism effect in the sewage is generated the micromolecular carbon source that can directly be utilized by biology, realize that waste water does not have to poison to handle and carbon source discharges;
C), in leaving standstill oxidation and active mud rete pond, sewage carries out the carbon source enrichment through active mud rete, and under high sludge age condition, realizes the one-level denitrification;
D), in hydrolysis acidification pool and A/O pond, handle through hydrolysis, A/O and to carry out second nitrification and denitrification denitrogenation, realize under the low-carbon (LC) condition that two imitate denitrogenations;
E), hydrolysis acidification pool and the A/O pond sewage after handling gets into second pond, the mud 100% in the second pond is back to adjusting-regeneration-adsorption tank, hydrolysis acidification pool and A/O pond; Get in adjustings-regeneration-adsorption tank returned sluge and again in the first low-temperature catalytic oxidation device hydroxyl oxidize make the release of cell walls content, the realization carbon source is utilized again;
F), by the sewage of second pond output again through the second low-temperature catalytic oxidation device, further utilize hydroxyl that oxidation operation effect in the waste water is realized that carbon source discharges;
G), again through static oxidation and thickener, carry out further hydroxyl oxidize and realize the degraded of COD and separating of suspended substance through selective active mud rete; And realized the selective active mud rete of the renewal of cyclic regeneration;
H), sewage again after the processing of UF filtering system, RO treatment system, the water of recyclable utilization gets into reuse pool, the water that can not recycle flow in the first low-temperature catalytic oxidation device again, carries out next round-robin and handles.
3. low-carbon (LC) economic benefits and social benefits denitrification sewage treatment process according to claim 2 is characterized in that, in the said step b), in the first low-temperature catalytic oxidation device, the ratio of the corresponding ammonia nitrogen concentration of hydroxy free radical concentration is 1:2～1:6.
4. according to claim 2 or 3 described low-carbon (LC) economic benefits and social benefits denitrification sewage treatment process, it is characterized in that in step c), in leaving standstill oxidation and active mud rete pond, hydroxyl concentration is consumed to 0 mg/litre, sludge age was controlled at 35～50.
5. low-carbon (LC) economic benefits and social benefits sewage treatment process according to claim 2 is characterized in that, two heavy surface loads of said second pond 0.8～2.5 cubic metre/square metre hour.
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