CN201809251U - Membrane filtration concentrated solution treatment device for landfill leachate - Google Patents
Membrane filtration concentrated solution treatment device for landfill leachate Download PDFInfo
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- CN201809251U CN201809251U CN2010202664964U CN201020266496U CN201809251U CN 201809251 U CN201809251 U CN 201809251U CN 2010202664964 U CN2010202664964 U CN 2010202664964U CN 201020266496 U CN201020266496 U CN 201020266496U CN 201809251 U CN201809251 U CN 201809251U
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Abstract
The utility model provides a membrane filtration concentrated solution treatment device for landfill leachate. The device comprises a shell, a concentrated solution inlet pipe, a liquid level meter, a biological contact oxidizing reaction tank, a valve, an air pump, a liquid flow meter, a suction pump, a recycling pipe and a membrane bioreactor; potassum permanganate for performing pretreatment to the concentrated solution and subsequent sodium hypochlorite and chlorine dioxide as catalysts for oxidizing organics under the synergic action are respectively stored in the biological contact oxidizing reaction tank in sequence; and coagulant and flocculant are stored in the recycling pipe. The recovery ratio of water during the treatment of concentrated solution can be improved, the mud residues generated during the coagulating sedimentation and the mud residues generated during the filtering process are dewatered, so that the water quality fully meets the requirement of primary emission standard after filtration, and water can be directly drained.
Description
Technical field
The utility model relates to a kind of treatment unit of field of environment protection domestic refuse, particularly a kind of film filtration concentrated treatment unit of percolate.
Background technology
Present stage, in garbage leachate treatment process, the main flow treatment process is microbiological treatment+membrane filtration both at home and abroad.The concentrated solution that produces in the membrane filtration processes has following characteristics: 1, concentrated solution output is big; Be 30～40% of film flooding quantity in half a year with the output of interior new membrane concentration liquid duration of service, and half a year, above membrane concentration output of fluid was about 50% of a film flooding quantity, and along with film increases duration of service, this amount also can increase; 2, COD is higher, and the COD main component in the concentrated solution is the organism of difficult degradation, and generally with the difference of region and local resident's food habits, the COD of concentrated solution is between 1000～3000mg/l; 3, colourity height; The colourity of concentrated solution is generally more than 500 times, and NH3-N concentration is high more, and colourity is high more; 4, biodegradability is poor: the organism in the concentrated solution mainly is the difficult degradation composition, and being difficult to provides nutrition source to microorganism; 5, comparison intensive stink is arranged.
At present, both at home and abroad in garbage leachate treatment process, the processing of concentrated solution or terms of settlement roughly have two kinds: the one, concentrated solution directly is back to leachate equalization basin, or concentrated solution collected, through oxidation ditch or other way concentrated solution is carried out recharging leachate equalization basin after simple process reaches homogenizing effect then.The essence of this treating method is exactly the process of concentrated solution infinite reflux.
The drawback that infinite reflux brings is conspicuous, accumulation along with the time, the amount that is back to the hardly degraded organic substance accumulation of equalizing tank gets more and more, and this hardly degraded organic substance can not provide nutrition source to microorganism, the biodegradability that causes percolate worse and worse, the function of whole biological treatment system reduces gradually in the percolate treating process thereby make, until going functionalization.The 2nd, evaporation concentration or charcoal absorption are handled, the cost of this method is high, the usually conduct cost is at 200～300 yuan/ton, if employing evaporation process, whole vapo(u)rization system has to consider the problem of high-temperature anticorrosion erosion, and along with the growth of duration of service, because the fouling of equipment causes heat transfer efficiency to descend seriously, processing cost further increases; The difficult problem of the maximum that the activated carbon treatment concentrated solution faces is the regeneration of gac, makes cost high.
In addition, the treatment process that also has a kind of laboratory report: the Li Aimin of Nanjing University professor and the joint study of German Wei Erli company be the processing means of core with ion exchange resin, it is reported that discharge water after the processing meets the first discharge standard among the GB16889-97.This method is that the adsorb organic compound with the antipollution resin is main processing means; from existing antipollution type ion exchange resin; can the long period under the condition of hardly degraded organic substance concentration, use and not contaminated resin not discovery at home and abroad reported; general common domestic and international ion exchange resin (no matter macroporous type or gel-type) uses under high COD condition; operating capacity can sharply descend; protective layer is easy to be penetrated by COD; simultaneously; the regeneration waste liquid of concentrated solution by ion exchange resin absorption after resin absorption is saturated (usually regeneration waste liquid be treatment capacity about 10%) processing be a more thorny difficult problem; so it is to be tested that the reliability of this method has, be appreciated that the minimizing to concentrated solution is good.
It is the difficult problem of a professional that the concentrated solution qualified discharge that membrane filtration produced during percolate was handled is handled, reach or be better than first discharge standard among the GB16889-97 and directly discharging if can concentrated solution be handled with lower cost, the benefit of then bringing is the water production rate of whole percolate treating process can be increased about 40%, can solve again because the serious problem that descends of the whole biological treatment system function that the concentrated solution infinite reflux is caused.。
Summary of the invention
The film filtration concentrated treatment unit that the purpose of this invention is to provide a kind of percolate, can improve the rate of recovery of the water in the concentrated solution processing, the body refuse that body refuse that precipitation process of coagulation produced and filtration produce will dewater, water quality satisfied the first discharge standard requirement among the GB16889-97 fully after the water process of body refuse dehydration was filtered, and can directly discharge.
The application's above-mentioned purpose reaches by the following technical programs:
A kind of film filtration concentrated treatment unit of percolate, comprise: housing, concentrated solution liquid-inlet pipe, liquidometer, bio-contact oxidation reaction tank, valve, pneumatic pump, liquid meter, suction pump, circulation recovery tube, membrane bioreactor, it is characterized in that: store the clorox and the dioxide peroxide that concentrated solution are carried out pretreated potassium permanganate, the organic catalyzer of follow-up synergistic oxidation in the described bio-contact oxidation reaction tank successively, store coagulating agent and flocculation agent in the described circulation recovery tube.
A kind of optimal technical scheme is characterized in that: the concentrated solution pH regulator in the described liquid-inlet pipe is 11, and continues more than 1 hour.
A kind of optimal technical scheme is characterized in that: the add-on of described potassium permanganate is that 1.0～3.5mg/ rises concentrated solution, and the add-on of clorox is that 5～30ml/ rises concentrated solution.
A kind of optimal technical scheme is characterized in that: described coagulating agent is a bodied ferric sulfate, and described flocculation agent is the Hofmann reaction thing of the polyacrylamide of modification.
A kind of optimal technical scheme is characterized in that: the concentrated solution pH value in the described liquid-inlet pipe is neutrality, and continues 1.5 hours.
The film filtration concentrated treatment unit that the purpose of this invention is to provide a kind of percolate.
In order to realize purpose of the present invention, the film filtration concentrated treatment unit of percolate provided by the invention comprises as follows:
(1) potassium permanganate is added carries out pre-treatment in the described concentrated solution.That adopts potassium permanganate carries out pre-treatment as catalytic oxidant, Potassium Permanganate Preoxidation is decomposed part oxidation operation in the concentrated solution, inorganic components with the part lower valency is oxidized to high valence state simultaneously, potassium permanganate is reduced into Manganse Dioxide, and Manganse Dioxide becomes follow-up clorox and the organic catalyzer of dioxide peroxide synergistic oxidation.
(2) clorox and dioxide peroxide are added in described (1) pretreated concentrated solution successively stir, the timed interval of the two adding was at least 1 hour.Under the katalysis of Manganse Dioxide, react with the organism in the concentrated solution, decompose or degradation of organic substances, clorox added before dioxide peroxide adds in 1 hour, and the direct degraded of most of organism or chloro, addition are changed into the easily form of degraded of dioxide peroxide; Clorox adds after 1 hour and adds dioxide peroxide, and the chlorine dioxide reaction time will guarantee just can enter the coagulating sedimentation stage about 1 hour.
(3) pH regulator with the concentrated solution after described (2) processing is 11, adds coagulating agent and flocculation agent and handles.The concrete way of the Hofmann reaction thing modification of polyacrylamide is: the Hofmann reaction thing of polyacrylamide is matched 0.5% solution, the calcium chloride or the magnesium chloride that take by weighing polyacrylamide weight 10% then are dissolved in the flocculation agent that has prepared, and can use after keeping 2 hours under 40 ℃ of conditions.The pH that treats the concentrated solution of coagulating sedimentation to be adjusted to about 11 in the time of coagulating sedimentation.
(4) with the liquid filtering after described (3) processing.Filter and adopt filter tank or other forms of strainer, as long as the first discharge standard that the SS of water outlet reaches among the GB16889-97 requires.
Preferably, the add-on of potassium permanganate is that 1.0～3.5mg/ rises concentrated solution, and the add-on of clorox is that 5～30ml/ rises concentrated solution.Described coagulating agent is preferably bodied ferric sulfate, and described flocculation agent is preferably the Hofmann reaction thing of the polyacrylamide of modification.
In order to improve the rate of recovery of the water in the concentrated solution processing, the body refuse that body refuse that precipitation process of coagulation produced and filtration produce will dewater, water quality satisfied the first discharge standard requirement among the GB16889-97 fully after the water process of body refuse dehydration was filtered, and can directly discharge.The rate of recovery of whole concentrated solution treating processes can reach about 98%, and comprehensive treating process becomes instinct to be controlled at 35 yuan/ton, and these two indexs are better than the various technology of use at present.
Principle of the present invention is as described below:
Take all factors into consideration the price and the performance of oxygenant, and final discharge water selects clorox and dioxide peroxide synergistic oxidation as the oxygenant in the concentrated solution processing to the influence of ecology for use.Select for use the foundation of these two kinds of oxygenants to be: (1). two kinds of oxygenants all are the oxygenants that is extensive use of in the present water treatment or recommends to use, and low price, make cost of water treatment low.(2). from clorox and dioxide peroxide in hydrolytic process, we as can be seen these two kinds of oxygenants in hydrolysis, all have oxyradical to generate, oxyradical has extremely strong oxidisability, clorox hydrolysis process also has chlorine radical to generate.
NaClO+H
2O→HClO+NaOH
HClO→HCl+[O]
HClO also has [Cl] to emit in the process that is hydrolyzed into HCl.
ClO
2+H
2O→HClO
2+H
2ClO
3
HClO
2And H
2ClO
3Further hydrolysis generates HCl and has [O] to emit
No matter chlorine radical or oxyradical, extremely strong oxidisability is all arranged, can will be many contain the oxidation operation (have directly be oxidized to carbonic acid gas) or the decomposition of unsaturated link(age) or polar link, chlorine radical and the oxyradical reaction mechanism by two different free radicals when lower atom of attack unsaturated link(age) or polar link electronegativity or atomic group carries out, and some oxidation operations or the decomposition in the concentrated solution had complementary action, clorox to organic reaction be replace, addition and oxygenolysis; Oxygenolysis directly takes place to organism in dioxide peroxide, and the ammonia in the water do not had an effect, its oxidizing reaction is selective, it can react with organism such as inorganicss such as oxide compound in the water, sulfide, iron, manganese and phenol, chlorophenol, mercaptan, secondary amine, tertiary amines, organism such as inorganics such as the ammonium salt of discord in the water, ammonia and chain hydrocarbon, alkene, alkynes, alcohol, acid anhydride, ketone aromatic series react, and clorox does not have selectivity, can the addition oxidizing reaction take place to replace with many organism in the water and inorganics; Hardly degraded organic substance in the water behind the clorox chloro, is more prone to by the dioxide peroxide oxygenolysis.(3). two kinds of oxygenants all have very strong killing action to mushroom, and the bacterium value that can guarantee final discharge water is in acceptability limit.(4). the adding of two kinds of oxygenants, can be used as the coagulant aids of follow-up coagulating sedimentation, reduce the usage quantity of flocculation agent, in the process of coagulating sedimentation, generally about 50,000 yuan/ton, the use of clorox makes the processing cost of coagulating sedimentation reduce by 30% to the price of employed coagulating agent.(5). clorox can be within an hour be reduced to the colourity of stink and concentrated solution within the acceptable ranges under the catalysed oxidn of potassium permanganate.
The use of catalyzer can make the speed of oxidizing reaction accelerate greatly.Clorox and dioxide peroxide oxidation or the available catalyzer of decomposing organic matter have potassium permanganate or Manganse Dioxide, bromate, bivalent cupric ion etc., in concentrated solution is handled, the introducing of catalyzer should be accelerated oxidizing reaction speed, after handling, concentrated solution is convenient to again separate with final discharge water, can not bring secondary pollution into, from these catalyzer, cupric salt is a kind of isolating component that relatively is difficult to, and in experiment because effect is obvious not as manganese system and bromate effect, when selecting, can get rid of, bromate is because price is higher than potassium permanganate or Manganse Dioxide, and the oxidation reaction catalysis oxidation rate in the concentrated solution there is not too big advantage with respect to potassium permanganate, and in subsequent disposal, relatively be difficult to remove, simultaneously, adding of Manganse Dioxide can strengthen follow-up coagulating sedimentation effect, particularly can increase the removal effect of precipitation process of coagulation, so also give up need not for sodium bromate to small organic molecule.The katalysis of potassium permanganate and Manganse Dioxide its essence is the catalysis of Manganse Dioxide, after potassium permanganate generates Manganse Dioxide with organism reaction back, potassium permanganate is still all quickened greatly to the catalyzed reaction of clorox and dioxide peroxide, final product is a Manganse Dioxide, and Manganse Dioxide can be removed in follow-up coagulating sedimentation.Compare with Manganse Dioxide, potassium permanganate is made catalyzer has following advantage with respect to Manganse Dioxide: (1). and potassium permanganate can preoxidation be removed partial organic substances; Potassium permanganate has removal effect preferably to phenols, condensed-nuclei aromatics, heterogeneous ring compound and hydrochloric ether, and Manganse Dioxide does not have.(2). potassium permanganate can reduce the growing amount of trichloromethane and other organic chloride; Singer PC, Borchad JH and Colthurst JM (1950) studies show that, the preoxidation of potassium permanganate makes and moves behind the chlorination point, and can reduce the muriatic generation that is derived from humic acid.This point is handled in the experiment at concentrated solution and is confirmed.So in the concentrated solution qualified discharge was handled, selecting potassium permanganate for use was suitable as catalyzer.The use of potassium permanganate can make the speed of oxidizing reaction accelerate greatly.Clorox and dioxide peroxide oxidation or the available potassium permanganate of decomposing organic matter
2. selecting of coagulating agent and flocculation agent:
(1). bodied ferric sulfate (PFS) is determined as coagulating agent
The organic matter removal of difficult oxidation difficult degradation had good effect during coagulating sedimentation was handled the concentrated solution qualified discharge, selected the combination of suitable coagulating agent and flocculation agent for use, can will directly be reduced within the 100mg/l through the COD of the concentrated solution after the catalytic oxidation treatment.In present widely used coagulating agent, it is the most obvious that bodied ferric sulfate is removed effect to organism, and in flocculation agent, the Hofmann reaction thing of polyacrylamide is removed effect to organism and is far superior to the flocculation agent of widely used other kind at present.And the Hofmann reaction thing of bodied ferric sulfate and polyacrylamide is used in combination the organic effect of removing is higher than these the two kinds effects with other coagulating agent or flocculation agent compatibility far away.Through be usually used in water treatment PAC (polymerize aluminum chloride) and its central atom of PFS (bodied ferric sulfate) be respectively aluminium (III) and iron (III), its nature difference is bigger, the electronic structure that mainly is atom has very big difference, aluminium (III) ion is the noble gas type, electric charge height and volume is little, thereby deformability is little, and it belongs to hard acid according to hsab theory, with hard part OH
-Generate electricity price type title complex.Iron (III) ion also belongs to hard acid, and identical electric charge is arranged with aluminium (III) ion, but it is a transition metal ion, belong to non-noble gas type, has the 3d5 electronic configuration, thereby deformability is strong, polarizability is remarkable, produce stronger mutual polarization with part, produce firm combination, bodied ferric sulfate (PFS) basic reason higher to the COD clearance that Here it is than polymerize aluminum chloride (PAC), generally speaking, polymerize aluminum chloride has only about 20% the clearance of COD, and bodied ferric sulfate has 50～85% to the clearance of COD.Other coagulating agent is as zinc salt, magnesiumcarbonate etc., is used in concentrated solution and the clearance of COD had only about 15% in handling; And bodied ferric sulfate is compared with other coagulating agent, and it is wider to water temperature and pH subject range, and the flco of formation is closely knit, and settling velocity is fast, and price is relatively cheap.
(2). select for use the modified cation polyacrylamide to do the reason of flocculation agent:
Common flocculation agent has polyacrylamide, the Poly Dimethyl Diallyl Ammonium Chloride class,
Polyacrylamide (PAM) is represented the general name of a class linear polymer (molecular weight is more than 5,000,000).Be called as the 3# flocculation agent at China PAM, with U.S. seporn, magnafloc, the sanfloc of Japan etc. belongs to like product.Because being easy to has amide group (so amide group has stronger adsorptive power to show stronger flocculation ability to suspended particles) on manufacturing, the side chain, in water treatment, be extensive use of.Common polyacrylamide has non-ionic type, anionic, amphiprotic polyacrylamide, cationic polyacrylamide.In addition, also have the polymeric flocculant of Poly Dimethyl Diallyl Ammonium Chloride class flocculation agent and other synthetic, both often uses of water treatment at home of back, Poly Dimethyl Diallyl Ammonium Chloride class flocculation agent only is used in the processing of petroleum wastewater.
Select with the flocculation agent of bodied ferric sulfate compatibility and will electrically select according to colloidal in the concentrated solution, the colloid in the concentrated solution is electronegative, so anionic and non-ionic type can exclude in concentrated solution is handled.Contrast amphiprotic polyacrylamide, cationic polyacrylamide are to the clearance of COD, amphiprotic polyacrylamide to the clearance of COD between 30～50%, and cationic polyacrylamide to the clearance of COD between 50～85%, so we select cationic polyacrylamide to make flocculation agent, and carry out modification according to local water quality in actual use, concrete modification way is seen in the concrete operations.
Cationic polyacrylamide is the degradation reaction product of polyacrylamide just, is commonly called as the Hofmann reaction thing of polyacrylamide.In concentrated solution was handled, the influence factor of coagulating sedimentation mainly contained pH, the pH wide range that bodied ferric sulfate uses, and generally 4～11, optimum value is 6～9.The part inorganic salt have negative impact as ferrous, ammonium ion etc. to coagulating sedimentation, and calcium ion and Manganse Dioxide can make whole precipitation process of coagulation that the clearance of COD is significantly improved.Manganse Dioxide does not need and outer the adding, can add afterreaction as catalytic oxidant at potassium permanganate and obtain, and the introducing of calcium ion can obtain by the calcium chloride modification of cationic polyacrylamide.
By determining that select for use potassium permanganate to make oxidation potassium permanganate, clorox and dioxide peroxide are done the synergistic oxidation agent, precipitation process of coagulation is selected bodied ferric sulfate and modified cation polyacrylamide compatibility for use.
Film filtration concentrated treatment process during consumer waste infiltration liquid of the present invention is handled is convenient feasible, every index after the processing is lower than the first discharge standard of existing national requirements, the desired every index of existing country-level standard (GB16889-97) is: BOD5≤30mg/l, SS≤70mg/l, COD≤100mg/l, NH
3-N≤15mg/l, colititre: 10-1.After adopting this technical finesse, every index can be stablized and reaches following value: BOD5≤20mg/l, SS≤20mg/l, COD≤60mg/l, NH
3-N≤5mg/l, colibacillus can't check.And it is with low cost.
Description of drawings
Fig. 1 forms sequential schematic for the film filtration concentrated treatment unit of percolate among the present invention;
Embodiment
The present invention is further illustrated below by embodiment.But this is not to be limitation of the present invention, and those skilled in the art can make various modifications or improvement according to basic thought of the present invention, but only otherwise break away from basic thought of the present invention, all within the scope of the present invention.
Embodiment 1: the determining of potassium permanganate optimal addn and reaction times:
The organic optimal ph of potassium permanganate oxidation is about neutrality, though potassium permanganate oxidisability under acidic conditions is the strongest.The pH of the concentrated solution that general membrane filtration produces is between 6～9, before adding potassium permanganate, need not adjust pH, the dosage of potassium permanganate and optimum reacting time determine to be subjected to following effects limit: because the generation of concentrated solution and to handle discharging is the process of a running balance, entire treatment cross the range request catalyzed oxidation get the residence time had better not be above 1.5 hours; Simultaneously, the dosage of potassium permanganate will consider that also the final discharge water after oxidation, coagulating sedimentation and filtration can not have owing to adding red-purple or the pink that potassium permanganate produces, and it is excessive to consider just that in the entire treatment process potassium permanganate adds.
Table 1 be the potassium permanganate dosage in 1.5 hours the residence time to the influence of concentrated solution COD with to the color influence of final discharge water.Obtained film filtration concentrated be the nanofiltration concentrated solution of Zhengzhou City's percolate treatment plant, COD=2600mg/l, colourity is 600 times, NH
3-N=25mg/l, BOD5=35mg/l.
Table 1
| Potassium permanganate dosage (mg/l) | COD after the preoxidation (mg/l) | Get colourity (doubly) after the preoxidation | The COD clearance | The color of final discharge water |
| 1.0 | 2546 | 400 | 2.07％ | No pink or red-purple |
| 1.5 | 2487 | 200 | 4.3％ | No pink or red-purple |
| 2.0 | 2310 | 180 | 11.15％ | No pink or red-purple |
| 2.5 | 2235 | 100 | 14.04 | No pink or red-purple |
| 3.0 | 2210 | 150 | 15.00％ | Pink appears |
| 3.5 | 2206 | 300 | 15.15％ | Pink is deepened |
The color of the final discharge water in the last table is for after handling through Potassium Permanganate Preoxidation, again through the final discharge water after clorox and the dioxide peroxide synergistic oxidation+coagulating sedimentation+filtration, after above-mentioned different concns potassium permanganate processing, NH3-N can be stabilized in 5～10mg/l substantially, and BOD5 can be stabilized to 15mg/l substantially.
Dosage along with potassium permanganate increases as can be seen from the above table, the COD that is got water sample behind the pre-catalyzed oxidation of potassium permanganate descends very fast, but after dosage surpasses 3.0mg/l, the COD range of decrease eases up, illustrate that the organic concentration that is easily decomposed by the potassium permanganate catalyzed oxidation in the concentrated solution reduces gradually, we with the potassium permanganate dosage be the sample of 3.0mg/l to place the COD that detects after 24 hours be 2196mg/l, illustrate in the concentrated solution easily to be tending towards complete by the reaction of potassium permanganate catalyzed oxidation decomposing organic matter.The colourity of the colourity of sample and final discharge water after the comprehensive treating process, it is proper that the dosage of potassium permanganate should select about 2.5mg/l, pH is constant substantially before and after the reaction.
Embodiment 2:
The best of clorox and dioxide peroxide adds the selection of condition:
According to the influence of organic components and other inorganic salt in the different and concentrated solution of clorox and dioxide peroxide to the organic mechanism of action, clorox is reacted to a certain degree with organism in the concentrated solution, and adding dioxide peroxide in back can guarantee not have substantially through the colourity of water outlet behind clorox and the dioxide peroxide synergistic oxidation, COD can drop to Schwellenwert in the regular hour, anti-choosing is tested just, and dioxide peroxide added before clorox, the colourity of water outlet both can both handle concentrated solution colourless, but the COD of key player on a team's experiment will be well below anti-choosing experiment, so, the order of synergistic oxidation is that clorox will add before dioxide peroxide adds, and guarantees that clorox can have the certain reaction time.In garbage leachate treatment process, the temperature of film filtration concentrated water outlet is generally about 25 ℃, under this temperature, clorox can reach 90% with the organism machine thing machine thing reaction that can react in the concentrated solution about 1 hour, under this water temperature, the time that the organism effect that dioxide peroxide reacts with energy selectivity in the concentrated solution is finished more than 90% also needed about 1 hour.So the time that adds of two kinds of reagent and order are in the synergistic oxidation: add reaction such as a certain amount of clorox and carry out adding again after 1 hour an amount of dioxide peroxide, after 1 hour, change the coagulating sedimentation stage in the dioxide peroxide adding.We can determine the optimal addn of clorox and dioxide peroxide according to experiment.Be through the effect after the potassium permanganate processing different amount of adding clorox later below.Used clorox is the technical grade product of commercially available available chlorine content about 10%, and used concentrated solution is COD=2200mg/l after the Potassium Permanganate Preoxidation, NH3-N=8mg/l, the water sample of BOD5=15mg/l.
Table 2
| Every liter of clorox amount (ml) that concentrated solution adds | COD (mg/l) after clorox is handled | The COD clearance | NH after clorox is handled 3-N(mg/l) | Colourity (doubly) after clorox is handled |
| 5 | 1800 | 18.18％ | 3 | 500 |
| 10 | 1250 | 43.185 | Can't check | 180 |
| 15 | 675 | 69.32％ | Can't check | 85 |
| 20 | 350 | 84.09％ | Can't check | 10 |
| 25 | 338 | 84.64％ | Can't check | 10 |
| 30 | 305 | 86.14％ | Can't check | 25 |
BOD5 is basicly stable in 20mg/l after the clorox add-on is greater than 10ml.
By experiment, the add-on of clorox should be proper between 20～25ml in the 1L concentrated solution, and after the add-on of clorox surpassed 25ml, colourity can rise, and the colourity of rising is produced by excessive clorox contribution.
When the Digestive tract of percolate biology treating part was undesired, the NH3-N of concentrated solution can rise, and the amount of the adding clorox of this moment has raising by a relatively large margin, and clorox can become nitrogen to emit the NH3-N preferential oxidation.
After determining the add-on of clorox, by orthogonal experiment, the add-on that is easy to determine dioxide peroxide is optimum value about 6ml, and used dioxide peroxide is commercially available solid chlorine dioxide, and it is 2000ppm that chlorine dioxide concentration is arranged after the dissolving.
This moment, the COD of concentrated solution can be stabilized in about 280mg/l, and colourity can obviously not raise, and the pH that handles the back concentrated solution has rising slightly.
So, use the best adding mode and the addition sequence of clorox and dioxide peroxide synergistic oxidation to be: in pretreated every liter of concentrated solution, to add the 20ml clorox by potassium permanganate, reaction is carried out adding the 6ml dioxide peroxide after 1 hour, and minimum the assurance at 1 hour of the residence time after allowing dioxide peroxide add.Carry out coagulating sedimentation subsequently.
Embodiment 3:
The condition of the condition of coagulating sedimentation and coagulating agent and flocculation agent compatibility is determined
Flocculation agent uses the Hofmann reaction of modified polyacrylamide, according to experiment, we have added 10% calcium chloride or magnesium chloride in the Hofmann reaction thing of polyacrylamide, both results of use are suitable, after adding calcium chloride or magnesium chloride, COD behind the coagulating sedimentation is better than the effect that does not add, and the clearance of COD has improved 20%.
The concrete way of the Hofmann reaction thing modification of polyacrylamide is: the Hofmann reaction thing of polyacrylamide is matched 0.5% solution, the calcium chloride or the magnesium chloride that take by weighing polyacrylamide weight 10% then are dissolved in the flocculation agent that has prepared, and can use after keeping 2 hours under 40 ℃ of conditions.
Coagulating agent is selected bodied ferric sulfate for use, use pH scope according to bodied ferric sulfate, determine by the alumen ustum that pH before and after the coagulating sedimentation and coagulation process produce, alumen ustum experiment by beaker, the consumption of determining bodied ferric sulfate is 800mg/l, and the Hofmann reaction thing consumption of corresponding modified polyacrylamide is 60mg/l.
Quantitatively the pH scope of the use of the coagulating agent of compatibility and flocculation agent can be determined by experiment, and experiment showed, that coagulating sedimentation has higher removal to COD in the pH scope that relatively is fit to.
Table 3 is that (water that carries out coagulating sedimentation is the concentrated solution through the catalytic oxidation treatment of potassium permanganate and clorox and dioxide peroxide through the COD variation behind variation of the pH before and after the concentrated solution coagulating sedimentation behind Potassium Permanganate Preoxidation and clorox and the dioxide peroxide synergistic oxidation and the coagulation, COD is 330mg/l, and colourity is 10 times).
Table 3
| PH before the coagulating sedimentation | PH behind the coagulating sedimentation | COD behind the coagulating sedimentation (mg/l) | Colourity behind the coagulating sedimentation (doubly) |
| 7 | 4 | 135 | 15 |
| 8 | 4.5 | 101 | 15 |
| 9 | 6 | 85 | 10 |
| 10 | 7.3 | 61 | 10 |
| 11 | 8.1 | 33 | 10 |
| 12 | 9.2 | 35 | 10 |
Colourity rise to be because the increase of iron ion forms in the solution under acidic conditions behind the coagulating sedimentation.From experiment, be transferred to about 11 at pH, the COD behind the coagulating sedimentation can be reduced to lower level.Just in the coagulating sedimentation stage, with sodium hydroxide or calcium oxide pH is transferred to about 11, every liter of concentrated solution adds the bodied ferric sulfate about 800mg and the Hofmann reaction thing of 60mg modified polyacrylamide, and the first discharge standard that will meet among the GB16889-97 through the reduction of the concentrated solution COD after the catalytic oxidation treatment is guaranteed.In the practical application technology, select for use the mechanical stirring accelerating purifying pool, select for use 3 times to 5 times body refuse to reflux, the usage quantity of coagulating agent and flocculation agent can be controlled at about half of existing usage quantity as coagulative precipitation tank.
Comprehensive above-mentioned potassium permanganate, clorox, the usage quantity and the working conditions of the Hofmann reaction of dioxide peroxide and bodied ferric sulfate and modified polyacrylamide are seen, percolate qualified discharge treatment process should be: add 2.5mg potassium permanganate in every liter of concentrated solution, stop that to add 20ml after 1.5 hours efficient be 10% clorox, stop after 1 hour that to add concentration be the dioxide peroxide 10ml of 2000ppm, after dioxide peroxide adds 1 hour, the pH of concentrated solution is adjusted to about 11 with 1% sodium hydroxide or calcium oxide solution carry out coagulating sedimentation, coagulating agent uses bodied ferric sulfate, flocculation agent uses the Hofmann reaction thing (using 10% calcium chloride or magnesium chloride modification) of the polyacrylamide of modification, the add-on of coagulating agent is 800mg, generally be made into 5% the aqueous solution, flocculant addition is about 60mg, generally is made into 0.5% the aqueous solution.Concentrated solution behind coagulating sedimentation carries out filtering separation, filtrate and mud concentrate the isolated water in back and discharge together with filtrate after reflux and filter, sludge moisture content after concentrating is about 60%, be transported to the landfill yard landfill, mud generally adopts centrifuge dewatering to concentrate, final discharge water can reach following index: BOD5≤10mg/l, SS≤20mg/l, COD≤60mg/l, NH3-N can't check, colititre can't check, and promptly is lower than or reaches the regulation limit of the first discharge standard among the GB16889-97, the detection method that the detection of index of correlation all uses relevant GB to require.After concentrated solution reaches These parameters by the pre-catalyzed oxidation of potassium permanganate, clorox and dioxide peroxide synergistic oxidation, coagulating sedimentation, filtration, can reach the desired index of first discharge standard among the GB16889-97 fully, thereby directly discharging, the problem of having avoided the concentrated solution infinite reflux to bring.
Water loss during whole concentrated solution is handled only exists only in the body refuse that coagulating sedimentation discharged in the stage, coagulating sedimentation uses the mechanical stirring accelerating purifying pool usually, there is 3～5 times body refuse to reflux, thereby reduced the add-on of coagulating agent and flocculation agent, so the output of body refuse is very low usually, the water yield that whole deslagging is taken away accounts for about 4% of treatment capacity, by the body refuse dewatering and recovery, the water yield that deslagging is taken away can be reduced to account for handles 2% of the water yield, and the rate of recovery of entire treatment process water can reach about 98%.The processing cost of concentrated solution per ton reaches 35 yuan, well below the concentrated solution evaporation process cost of selecting for use at present.
Claims (1)
1. the film filtration concentrated treatment unit of a percolate, comprise: housing, concentrated solution liquid-inlet pipe, liquidometer, bio-contact oxidation reaction tank, valve, pneumatic pump, liquid meter, suction pump, circulation recovery tube, membrane bioreactor, it is characterized in that: store successively in the described bio-contact oxidation reaction tank concentrated solution is carried out pretreated potassium permanganate, the organic catalyzer of follow-up synergistic oxidation, store coagulating agent and flocculation agent in the described circulation recovery tube.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016145487A1 (en) * | 2015-03-16 | 2016-09-22 | Water Science Technologies Pty Ltd | Process and apparatus for treating water |
| CN109694146A (en) * | 2018-12-04 | 2019-04-30 | 海南天美源环境保护设备工程有限公司 | A kind of processing method of consumer waste infiltration liquid |
| WO2021030864A1 (en) * | 2019-08-20 | 2021-02-25 | Infinite Water Technologies Pty Ltd | Process and apparatus for treatment of water for drinking |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016145487A1 (en) * | 2015-03-16 | 2016-09-22 | Water Science Technologies Pty Ltd | Process and apparatus for treating water |
| CN107531533A (en) * | 2015-03-16 | 2018-01-02 | 水科技有限公司 | The method and apparatus for handling water |
| US20180050938A1 (en) * | 2015-03-16 | 2018-02-22 | Water Science Technologies Pty Ltd | Process and apparatus for treating water |
| AU2016232986B2 (en) * | 2015-03-16 | 2020-07-02 | Infinite Water Technologies Pty Ltd | Process and apparatus for treating water |
| US11111165B2 (en) * | 2015-03-16 | 2021-09-07 | Infinite Water Technologies Pty Ltd | Process and apparatus for treating water |
| CN109694146A (en) * | 2018-12-04 | 2019-04-30 | 海南天美源环境保护设备工程有限公司 | A kind of processing method of consumer waste infiltration liquid |
| WO2021030864A1 (en) * | 2019-08-20 | 2021-02-25 | Infinite Water Technologies Pty Ltd | Process and apparatus for treatment of water for drinking |
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