CN104118937A - Application of potamogeton crispus fermentation liquor to improving capability of denitrification for sewage treatment - Google Patents
Application of potamogeton crispus fermentation liquor to improving capability of denitrification for sewage treatment Download PDFInfo
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- CN104118937A CN104118937A CN201410385214.5A CN201410385214A CN104118937A CN 104118937 A CN104118937 A CN 104118937A CN 201410385214 A CN201410385214 A CN 201410385214A CN 104118937 A CN104118937 A CN 104118937A
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- water caltrop
- denitrification
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Classifications
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- Y02W10/12—
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses an application of potamogeton crispus fermentation liquor to improving the capability of denitrification for sewage treatment. The potamogeton crispus fermentation liquor is prepared by draining off and grinding potamogeton crispus after collecting potamogeton crispus, then putting ground potamogeton crispus in a fermentation tank to be mixed with naturalized activated sludge, then adding water, carrying out constant temperature fermentation, and removing potamogeton crispus residues through filtration. The invention also discloses an application of potamogeton crispus fermentation liquor to improving the capability of denitrification for sewage treatment. The method has the advantages of simplicity in operation, cheap and easily obtained raw materials, good denitrification effects and the like, and has important social, economic and ecological benefits.
Description
Technical field
The invention belongs to field of environment engineering technology, be specifically related to a kind of water caltrop fermented liquid in the application improving in sewage disposal denitrification denitrogenation ability.
Background technology
In recent years, the annual comprehensive evaluation result demonstration of Taihu Lake basin water quality of river, 85.2% monitoring section water quality cannot reach III generic request, and major part is V class and bad V class.Wherein the main pollutent that exceeds standard is ammonia nitrogen, permanganate index, dissolved oxygen, five-day BOD, petroleum-type, total phosphorus and chemical oxygen demand (COD).Upstream ingoing river and lake are swung regional water quality and are continued deterioration and directly cause Taihu Lake to enter the lake total amount of pollutant constantly increasing.Entered the impact that lake pollutent increases, TP, TN content in the water body of Taihu Lake are lasting ascendant trend substantially in recent years, breakout of cyanobacteria blooms, and spring, water caltrop raised growth, affected lake water water quality.Therefore, the key of protection TAIHU LAKE environment is to hold back from source by the pollutent that enters Taihu Lake, and priority control ingoing river enters the total amount of pollutant of lake region.
At present, nearly 200 of the total urban wastewater treatment firm of Taihu Lake basin, all the one-level A emission standard in execution " urban wastewater treatment firm pollutant emission standard " (GB18918-2002).But one-level A emission standard (TN15mg/L, NH
3-N5 (8) mg/L, TP0.5mg/L) remain and substantially exceed water environment quality standard (surface water V class water lake standard TN2mg/L, NH
3-N2mg/L, TP0.4 (lake 0.2) mg/L).Face the present situation that Taihu Lake body eutrophication is on the rise, if the sewage treatment plant tail water of a large amount of discharges directly discharges without advanced treatment, water quality on stream entering lake is produced to greatly impact, then aggravate Taihu Lake water body nitrogen and phosphorus pollution degree, threaten drinking water safety.Meanwhile, it is also to solve Taihu Water Resources shortage, open up the second water resources, reduce the effective measure of fresh water consumption that tail water is carried out to advanced treatment, reuse, is the inevitable requirement of urban sustainable development, has significant environment, economic and social benefit.
Conventional sewage treatment plant tail water advanced treatment technology mainly contains physico-chemical process (filtration method, absorption method etc.), biological process (bio-reactor, biological filter, artificial swamp etc.) and membrane separation process (reverse osmosis, micro-filtration, nanofiltration etc.), and wherein Artificial Wetland Techniques is because of its investment with maintenance cost is low, nitrogen phosphorus removal effect is good, secondary pollution is little and have the advantages such as landscape effect concurrently is widely used.
Sewage Plant tail water is carried out to water quality analysis, find that its nitrogen height is nitrated, carbon source wretched insufficiency.Investigation also shows, has 50% sewage treatment plant inflow carbon source deficiency nearly in the town sewage plant of Taihu Lake basin.And carbon source is the electron donor in denitrification process, be the key factor of restriction denitrification, realize the advanced treatment of Sewage Plant tail water, must add enough additional carbons, ensure that certain carbon-nitrogen ratio just can make denitrification process complete smoothly.
Traditional denitrification additional carbon, taking liquid state organics as main, comprises glucose, methyl alcohol, ethanol and acetic acid etc.But denitrogenation cost is high, and the carbon source such as methyl alcohol has certain toxicity, can cause potentially dangerous to environment.In recent years, the novel carbon source that domestic and international many investigators find low toxicity, cheapness by number of ways replaces traditional carbon source.
In sewage treatment plant tail water function wetland treating processes, wetland has been planted the waterplant of a large amount of rich cellulose class materials, these plants can produce a large amount of voltaile fatty acids (VFAs) and other nutritive elements through anaerobically fermenting after harvesting, are good potential additional carbons.
Taking a large amount of waterplant of planting in function wetland as raw material, by anaerobically fermenting, the cellulose substances being rich in plant materials is converted into voltaile fatty acid (VFAs) and other nutritive elements, as denitrification additional carbon, realize the advanced nitrogen processing of Sewage Plant tail water, can solve the harvested handling problems of constructed wetland plant simultaneously, realize the recycling of waterplant, important Research Significance and using value.
Existing result of study shows, the nitration denitrification effect of microorganism is one of important channel of nature Nitrogen Cycling.Denitrification is under anaerobic or hypoxia condition, the process that microorganism changes into nitric nitrogen and nitrite nitrogen nitrogen and discharges into the atmosphere.
The major influence factors of denitrification denitrogenation has dissolved oxygen (DO), pH, temperature, carbon source etc.
(1) dissolved oxygen (DO) be it is generally acknowledged, when dissolved oxygen remains on below 0.5mg/L, denitrification could normally be carried out.This is because O
2connect nucleophobic ability higher than NO
2 --N and NO
3 --N, in the time there is molecular oxygen and nitrate, denitrifying bacterium preferentially carries out aerobic repiration simultaneously.
(2) the best pH of pH denitrification is 7～8.
(3) optimum temps of temperature denitrification is 15～30 DEG C.For the reduction of temperature, denitrifying bacterium is more responsive than nitrobacteria.In the time there is seasonal cooling, denitrification process will be suppressed prior to nitrifying process, now need additional carbon to improve denitrification effect.In addition, temperature also can make a significant impact microorganism active, and then affects denitrification effect.
(4) carbon source carbon source is the electron donor in denitrification process, is also the main source of microorganism growth and breeding institute energy requirement simultaneously.Carbon source deficiency will directly affect denitrification, and adding additional carbon is one of effective ways that improve denitrification denitrogenation efficiency.The kind of additional carbon and dosage all can make a significant impact denitrification efficiency.
Existing additional carbon can be divided into two classes, i.e. traditional carbon source and novel carbon source substantially.Tradition carbon source, taking liquid state organics as main, comprises low molecule organic matter class (as methyl alcohol, ethanol and acetic acid etc.) and glucide (as glucose, sucrose etc.).Novel carbon source mainly comprises trade effluent of natural solid organism (as straw etc.), some degradable artificial materials (as waste paper, degradable cutlery box etc.) and the high carbon content of rich cellulose class material etc.
The low molecule organic matters such as methyl alcohol, ethanol, acetic acid are because molecule is little, be easily considered to desirable additional carbon by denitrifying bacteria utilization.Gersberg etc. make artificial wet land system nitric efficiency reach 95% by adding methyl alcohol.The result of study of Pochana etc. shows, adding acetic acid is the process that carbon source can improve synchronous nitration and denitrification greatly.Rustige etc. add acetic acid as carbon source treating refuse percolate in the horizontal flow section of compound flow constructed wetland, and result shows that denitrification rate increases along with the increase of acetic acid addition, and nitrate removal rate reaches as high as 98%.Although such carbon source nitric efficiency is high, has the shortcomings such as expensive, operation cost is high, and methyl alcohol has certain toxicity, transport inconvenience.
Glucide is as additional carbon, and treatment effect is better, and cost is also lower.Zhao Lianfang etc. process municipal pollution river with artificial swamp, for the high sewage of nitre nitrogen concentration, can effectively improve efficiencies of nitrogen removal by adding glucose, and wetland C/N is increased at 8 o'clock by 2, and TN clearance provides to 89% by 55%.She Lihua etc. strengthen wetland denitrification effect by the distinctive ventpipe supplementary carbon source of composite vertical current artificial wetland (IVCW) system to wetland bottom, result shows, the denitrification effect of glucose during as additional carbon is better than carboxymethyl cellulose (CMC), the best glucose dosage of IVCW system for treatment capacity 60L/d is 1.5g, the mass ratio of glucose and nitre nitrogen is only 4.3, the C/N that dosage is required far below denitrification.When but glucose is made carbon source, microorganism cells productive rate is high, easily causes the techniques such as artificial swamp to occur latch up phenomenon.
Liu Gang etc. think, during using trade effluent as additional carbon, denitrification efficiency is subject to that in trade effluent, low molecule organic matter is containing quantitative limitation, if low molecule organic matter content is low in waste water, denitrification efficiency just can not be improved significantly.Waste water adds in process and must control and add ratio simultaneously, prevents that effluent quality from worsening.
Cellulose family carbon source wide material sources, with low cost, the SOLID ORGANIC carbon source of the rich cellulose class material of research has waterplant branch or the stem stalks etc. such as waste paper, maize straw, straw, straw and cattail, reed at present.Promoter action to simulation Nitrogen Removal Effect in Constructed Wetland when Wen Hui etc. have studied using straw as additional carbon, when result shows to be 30mg/L into water nitre nitrogen concentration, removing nitre nitrogen optimal conditions is 25 DEG C of temperature, reaction times 10h, the mass ratio of straw and water is 1:50.The Electronic Speculum result demonstration of scanning shop, having there is cavity in the straw surface of reacting, becomes from fine and close band structure the filamentary texture breaking, and shows that the biodegradable composition on straw surface is decomposed as denitrifying carbon source in a large number by microorganism.Denitrification effect when Jin Zanfang etc. (2004) have studied cotton and paper as carbon source, result shows that these two kinds of carbon sources all can make fast start up of reactor, 25 DEG C of room temperatures, water inlet nitre nitrogen is respectively 22.6,45.2mg/L, hydraulic detention time is respectively 9.8, when 8.6h, nitre nitrogen removal efficiency can reach respectively 100%, 99.6%, and water outlet is accumulated without nitrite nitrogen.Denitrification effect when Chen Yun peak etc. has compared straw, Pericarppium arachidis hypogaeae, dried sweet potato, corn cob, Canna generalis Bailey dead leaf, degradable cutlery box, poly butylene succinate (PBS) and polyhydroxyalkanoate (PHAs) as carbon source, optimizes straw and is more suitable for as sewage treatment plant tail water denitrification supplementary carbon source.Zhao Lianfang etc. are rich in the potential impact situation of organic vegetable material VOCs emission rule and plant materials decomposition water quality according to these 4 kinds of maize straw, rice husk, wood chip and reed rods, determine that reed pole is more suitable plant carbon source, when its addition is 1.0kg/m
2time, vertical current constructed wetland TN clearance is increased to 80% by 60%.Using cellulose substances as carbon source, not only denitrification effect is better, cheap and easy to get, and reaches the object of utilization of waste material, meets the demand for development of China's present stage energy-saving and emission-reduction and recycling economy.But the hydraulic detention time that the release that its defect is carbon source can not be effectively controlled, need is long, effluent quality is subject to extraneous thermal effect.
In city organic waste water (as brewing wastewater, molasses containing waste water, starch wastewater etc.) and municipal effluent plant excess sludge, contain a large amount of readily biodegradable materials, after anaerobically fermenting, can produce a large amount of short chain volatile lipid acid, as acetic acid, propionic acid etc., be the denitrification additional carbon of high-quality, can be preferentially utilized by denitrifying microorganism.Table 1 has been summed up the denitrification effect while studying more city organic waste anaerobic acid-production fermented liquid as denitrification supplementary carbon source.
Table 1 abandoned biomass anaerobic acid-production fermented liquid is as denitrifying carbon source research overview
What Chinese scholars research was at present more is the denitrification effect while utilizing excess sludge of town sewage plant anaerobically fermenting acidizing product as additional carbon.Using excess sludge as fermentation substrate, both reduced sludge quantity, reduce the processing cost of mud, for sewage denitrification and dephosphorization provides high-quality carbon source, reduce carbon source cost again.The fermented liquid that Tong Juan (2008) obtains under alkaline condition with excess sludge as a supplement carbon source is processed the sanitary sewage of low COD, and carry out comparative study using actual sewage as carbon source, result shows to add the Nitrogen/Phosphorus Removal of SBR after fermented liquid and is greatly promoted, the clearance of COD, TN and SOP reaches respectively 93%, 80.9% and 97.2%, and add actual sewage while making carbon source the clearance of COD, TN and SOP only have respectively 85%, 63.5% and 43.9%.Liu Dao extensively adopts tensio-active agent to promote sludge fermentation to produce acid, the carbon source using fermented liquid as denitrification dephosphorization system, TP, NH
3the clearance of-N and TN reaches respectively 97%, 95% and 81%, and the order that in fermented liquid, VFAs is utilized is butyric acid, propionic acid, acetic acid.Nitrogen/Phosphorus Removal when some scholars have also studied product after the organic waste water anaerobic fermentation of high density city as carbon source.As the employing SBR techniques such as Quan are processed common municipal effluent using hydrolysis honey as additional carbon, nitric efficiency can reach (91.6 ± 1.6) %, (85.3 ± 2.0) % while making carbon source higher than methyl alcohol, but carbon source cost is lower by 20% than methyl alcohol.
Summary of the invention
The technical problem that the present invention also will solve is to provide water caltrop fermented liquid as carbon source, adds in the reactor of disposing of sewage, and sewage is carried out to the application of denitrogenation processing.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
The application of a kind of water caltrop fermented liquid in the denitrification ability that improves sewage disposal.
Wherein, described application, is characterized in that, described water caltrop fermented liquid prepares as follows:
(1) preparation of water caltrop: water caltrop drains after collecting, pulverizes;
(2) preparation of fermented liquid: the water caltrop after pulverizing is placed in to fermentor tank, mixes, then add water with the active sludge of process domestication, ferment at constant temperature, filters and remove water caltrop residue, prepares water caltrop fermented liquid.
In step (2), water caltrop, active sludge and water are according to throwing in 100 kg:1L:1L ratios.
In step (2), the acclimation method of active sludge adopts method well known in the art to cultivate domestication, tames the composition of substratum and acclimation temperature, pH, time by control, finally makes denitrifying microorganism become dominant microflora; Preferably adopt domestication with the following method:
Tame the composed as follows of substratum: glucose 15g/L, NaNO
33.04g/L, KH
2pO
40.44g/L, MgSO
47H
2o0.96g/L, CaCl
20.72g/L, NaHCO
30.96g/L, MnCl
20.11g/L.
Excess sludge after the dehydration of 2.5kg sewage work is packed in the fermentor tank of 5L, add 4L domestication substratum, regulating pH is 7.4,28 DEG C of domestications one week, monitors pH every day.
In step (2), leavening temperature is 15-37 DEG C, is preferably 30-37 DEG C, most preferably is 37 DEG C.
In step (2), the time of fermentation is 3-7 days, is preferably 5-7 days, most preferably is 7 days.
In step (2), in fermenting process, controlling pH is 7～8, is preferably 7～7.5.
Wherein, described sewage, wherein the content of nitre nitrogen is 5-30mg/L, is preferably 10-20mg/L, most preferably is 14mg/L.
Wherein, the addition of described water caltrop fermented liquid is that 5-10 calculates according to the ratio of the N content in the COD value of water caltrop fermented liquid and sewage, and preferred ratio is 8; Hydraulic detention time is 4-6h, is preferably 5h.
Beneficial effect:
The present invention has following distinguishing feature and effect:
1, water caltrop raw material sources are wide, cost is low, and preparation water caltrop fermented liquid method is simple.
2, by water caltrop recycling, solve the rear unmanageable problem of water caltrop harvesting, alleviate its harm to environment.
3, add to water caltrop fermented liquid as carbon source in the hypoxia activity sludge reaction system of sewage disposal, can fast and effeciently improve the nitric efficiency of reaction system, and add with fermented liquid the nitrogen phosphorus of bringing into and can not affect effluent quality.
Brief description of the drawings
Fig. 1: hypoxia activity sewage sludge reactor, is made up of reaction tank and settling tank two portions, as shown in Figure 1.Reaction tank is made up of 1.5L filter flask, is denitrogenation place, and Inner contains 1.3 sewage, 200ml active sludge and a rotor, be placed on magnetic stirring apparatus, settling tank by 1.25L heartily purified water bottle convert.When experiment, in tank, sewage, by constant flow pump with constant rate of speed suction reaction tank bottom, is adjusted reaction tank bottom rotor rotating speed by magnetic stirring apparatus active sludge is suspended, and to increase the contact area of mud and sewage, accelerates denitrifying microorganism denitrification rates; Reaction tank water outlet realizes mud-water separation through settling tank, and at the bottom of settling tank, the mud of bottom is back to reaction tank bottom to reduce mud loss by constant flow pump.
Fig. 2: hypoxia activity sewage sludge reactor TN clearance.
Fig. 3: hypoxia activity sewage sludge reactor NO
3 --N clearance.
Fig. 4: hypoxia activity sewage sludge reactor TP clearance.
Embodiment
According to following embodiment, the present invention may be better understood.But, those skilled in the art will readily understand, the described content of embodiment is only for the present invention is described, and should also can not limit the present invention described in detail in claims.
In embodiment, instrument used has: Baoding Lange BT-2 type constant flow pump, XX type magnetic stirring apparatus, 1.5L filter flask, plant pulverizer, water isolation type constant incubator, ultraviolet-visible spectrophotometer UV2450, D-1 type automatic steam sterilization pan, electronic balance, 25mL tool plug glass ground joint colorimetric cylinder, quartz colorimetric utensil, ultrapure water system (Milli-Q, Millipore), 0.45 μ m water system filter membrane.
In embodiment, the detection method of the component of water outlet and water inlet is as follows: (1) TN measures and adopts potassium persulfate oxidation-ultraviolet spectrophotometry: (2) NO
3 --N measures and adopts ultraviolet spectrophotometry; (3) NO
2 --N measures N-(1-naphthyl)-quadrol light-intensity method; (4) NH
3-N measures and adopts nessler reagent light-intensity method: (5) TP measures and adopts alkaline potassium per-sulfate digestion-ammonium molybdate development process: COD
crmeasure and adopt potassium dichromate process: (6) DO measures and adopts the portable dissolved oxygen meter of Hash HQ30d; (7) pH measures and adopts the portable pH meter of Hash HQ30d.
Embodiment carries out as follows: 4 groups of hypoxia activity sewage sludge reactors (numbering 1,2,3,4, in table 3) are set, with NaNO
3for nitrogenous source, NO
3 --N concentration 14mg/L, water caltrop fermented liquid is carbon source, and influent COD/N is made as respectively 0,4,8,12, investigates respectively under each influent COD/N condition, hydraulic detention time is 2,4,8, system nitric efficiency when 12h, to determine water caltrop fermented liquid optimum dosage and optimal water power standing time.Continuous flow, moves 1d under each hydraulic detention time, gathers water outlet water sample every 8h, measures total nitrogen, nitre nitrogen, ammonia nitrogen, nitrite nitrogen, total phosphorus, COD
cr, pH, DO.Experiment repeats 3 times.
Embodiment 1: the preparation of fermented sludge.
Test fermented sludge used and take from the excess sludge after sewage work's dehydration.
Following component preparation domestication substratum: glucose 15g/L, NaNO
33.04g/L, KH
2pO
40.44g/L, MgSO
47H
2o0.96g/L, CaCl
20.72g/L, NaHCO
30.96g/L, MnCl
20.11g/L.The excess sludge after the dehydration of 2.5kg sewage work is packed in the fermentor tank of 5L again, add 4L domestication substratum, regulating pH is 7.4,28 DEG C of domestications one week, monitoring regulation and control every day pH.
Active sludge in following examples is preparation according to the method described above all.
Embodiment 2: the preparation of water caltrop fermented liquid.
Test water caltrop used and pick up from sounds of nature river, the celestial woods school district of Nanjing University.After water caltrop gathers, with cleaning, drain, take 1.3kg, pulverize with plant vermicelli machine, be placed in the fermentor tank that volume is 5L, add the fermented sludge 350ml after domestication simultaneously, and removing the ultrapure water 3000ml after dissolved oxygen through overexposure nitrogen 10min, adjusting pH is 7-8.Fermentor tank is placed in water isolation type constant incubator, 37 DEG C of anaerobically fermentings 7 days.Filtering fermentation liquor is removed water caltrop residue, collects filtrate, and 4 DEG C save backup.
Water caltrop fermented liquid in following examples is preparation according to the method described above all.
Embodiment 3: add the impact of water caltrop fermented liquid on influent quality.
Every water-quality guideline of water caltrop fermented liquid is as shown in table 2, and taking water caltrop fermented liquid as carbon source, the influent quality of preparation is as shown in table 3.Fermented liquid COD
cr, TN, TP content be respectively 15400,208.6,143.7mg/L, in fermented liquid, nitrogen mainly exists with ammonia-state nitrogen form, phosphorus mainly exists with solubility orthophosphoric acid salt (DIP) form.Therefore,, when improving in water inlet organic content by adding water caltrop fermented liquid, also can bring nitrogen, phosphorus into.Compared with not adding fermented liquid group, COD/N=8,16,24 o'clock, water inlet TN content has increased respectively 1.3,2.8,4.1mg/L, TP content increases respectively 0.97,2.22,2.82mg/L, nitre nitrogen, nitrite nitrogen content are without obvious increase, and pH slightly declines, and DO content obviously reduces.
The every water-quality guideline of table 2 water caltrop fermented liquid
Table 3 water caltrop fermented liquid is the influent quality of carbon source preparation
Embodiment 4: identical hydraulic detention time, the impact of different influent COD/N on hypoxia activity sewage sludge reactor denitrification effect.
As shown in table 4, under same hydraulic detention time, along with being increased to 16, TN clearance by 0, influent COD/N is increased to 65%～88%, NO by 3%～8%
3 --N clearance is increased to 95%～100% by 6%～15%, illustrates that adding water caltrop fermented liquid can significantly improve denitrification denitrogenation effect (p=0.08); In the time that COD/N continues to be increased to 24 by 16, TN clearance no longer improves, and slightly declines on the contrary, and this is mainly that in the time of COD/N=24, too much ammonia nitrogen can not be completely removed because what add that fermented liquid brings into is mainly ammonia nitrogen.
Embodiment 5: identical influent COD/N, different hydraulic detention times are on the impact on hypoxia activity sewage sludge reactor denitrification effect
As shown in table 4, under same COD/N condition, along with hydraulic detention time extends to 12h by 2h, TN clearance is increased to 65%～88%, NO by 3%～8%
3 --N clearance is increased to 95%～100% by 6%～15%, illustrates that the proper extension water conservancy residence time can improve denitrification denitrogenation effect (p=0.05) equally.Under COD/N=16 condition, carbon source abundance, when HRT=2,4,8,12h, TN clearance is respectively 65%, 84%, 86%, 88%, NO
3 --N clearance is respectively 65%, 99%, 99%, 100%, and HRT is increased to 4h by 2h can significantly improve TN, NO
3 --N clearance, when HRT=4h, NO
3 --N clearance has reached 99%, illustrates and supplements enough water caltrop fermented liquids as carbon source, and denitrification denitrogenation process can complete substantially in 4h.
Table 4 hypoxia activity sewage sludge reactor effluent quality
Under the condition of COD/N=8, HRT=2,4,8,12 o'clock, water outlet NO
2 --N concentration is respectively 4.2,0.58,0.29,0.22mg/L, and water outlet NO is described when carbon source is not enough
2 -there is accumulation in-N content, and levels of accumulation significantly reduces with the prolongation of hydraulic detention time.When HRT=2h, water outlet NO
2 --N concentration reaches 4.2mg/L, and when HRT=4h, water outlet NO
2 --N concentration is down to 0.58mg/L, and the first stage (NO of denitrification process is described
3 --N is converted into NO
2 --N) mainly occur in front 2h, subordinate phase (NO
2 --N is converted into N
2) mainly occur in 2nd～4h.
COD/N=0,8,16,24 o'clock, water outlet TP concentration mean value is respectively 0.20,0.54,1.19,1.06mg/L, TP clearance mean value is respectively 28.3%, 57%, 52.5%, 65.8%, water outlet TP concentration improves and increases with influent COD/N, this is mainly because influent COD/N is higher, add the phosphorus brought into of fermented liquid also more, and between TP clearance and influent COD/N without evident regularity.Under same influent COD/N condition, taking COD/N=16 as example, HRT=2, 4, 8, 12 o'clock, water outlet TP concentration is respectively 1.59, 1.05, 0.98, 1.13mg/L, TP clearance is respectively 36.4%, 58.0%, 60.8%, 54.8%, water outlet TP concentration along with the prolongation of HRT first reduce after slightly raise, TP clearance along with the prolongation of hydraulic detention time first increase after slightly reduce, this is main because the removal of TP is mainly the adsorption by active sludge in simulation anaerobic reactor, proper extension hydraulic detention time can improve the adsorption rate of phosphorus, when but hydraulic detention time is long, the phosphorus being adsorbed may again discharge again and cause water outlet TP content slightly to raise.
Effluent COD concentration reduces along with the prolongation of hydraulic detention time, and this explanation hydraulic detention time is longer, just more by the organism of microbial consumption.COD
consumption/ N has reacted the relation between denitrifying microorganism denitride amount and carbon source consumption.By NO
3 --N clearance can be found out, influent COD/N=16,24 o'clock, water-inlet carbon source abundance, but under influent COD/N=24 condition, effluent COD concentration mean value reaches 113mg/L, illustrate that now water caltrop fermented liquid interpolation is excessive, the organism that a part is not utilized by denitrifying microorganism is discharged with water outlet, not only affects water outlet qualified discharge and causes carbon source waste simultaneously.Therefore think that influent COD/N=16 is more suitable, COD now
consumption/ N can think best influent COD/N.As shown in Table 3, when HRT=2,4,8,12h, best influent COD/N is respectively 9.1,9.4,9.6,9.5.
In sum, add water caltrop fermented liquid and can fast and effeciently improve hypoxia activity sewage sludge reactor nitric efficiency, adding with fermented liquid the nitrogen phosphorus of bringing into can not affect effluent quality, water inlet NO
3 -when-N concentration is 14mg/L, denitrification denitrogenation process can complete in 4h.Optimal HRT=4h, best influent COD/N=11.2.
Add water caltrop fermented liquid as hypoxia activity sewage sludge reactor denitrification additional carbon, under different influent COD/N, different hydraulic detention time condition, effluent quality is as shown in table 4.Hypoxia activity sewage sludge reactor TN clearance is shown in Fig. 2, hypoxia activity sewage sludge reactor NO
3 --N clearance is shown in Fig. 3, and hypoxia activity sewage sludge reactor TP clearance is shown in Fig. 4.
Claims (8)
1. a water caltrop fermented liquid is in the application improving in sewage disposal denitrification denitrogenation ability.
2. application according to claim 1, is characterized in that, described water caltrop fermented liquid prepares as follows:
(1) preparation of water caltrop: water caltrop drains after collecting, pulverizes;
(2) preparation of fermented liquid: the water caltrop after pulverizing is placed in to fermentor tank, mixes, then add water with the active sludge of process domestication, ferment at constant temperature, filters and remove water caltrop residue, prepares water caltrop fermented liquid.
3. water caltrop fermented liquid preparation method according to claim 2, is characterized in that, in step (2), water caltrop, active sludge and water are thrown in 100kg:1L:1L ratio.
4. water caltrop fermented liquid preparation method according to claim 2, is characterized in that, in step (2), leavening temperature is 15-37 DEG C.
5. the preparation method of water caltrop fermented liquid according to claim 2, is characterized in that, in step (2), the time of fermentation is 3-7 days.
6. the preparation method of water caltrop fermented liquid according to claim 2, is characterized in that, in step (2), in fermenting process, controlling pH is 7～8.
7. application according to claim 1, is characterized in that, described sewage, and wherein the content of nitre nitrogen is 5-30mg/L.
8. application according to claim 1, is characterized in that, water caltrop fermented liquid is calculated and adds sewage according to following addition: the ratio of the N content in COD value and the sewage of water caltrop fermented liquid is 5-10, and the hydraulic detention time of sewage is 4-6h.
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