The processing method of ammonia nitrogen in a kind of removal sanitary wastewater
Technical field
The present invention relates to a kind of processing methods for removing ammonia nitrogen in sanitary wastewater, belong to the wastewater treatment neck in environmental protection
Domain.
Background technology
In recent years, with the continuous improvement of China cities and towns living standards of the people, the nitrogen content in urban life waste water is drastically
Rise, arbitrary discharge of more and more nitrogenous effluents causes great harm to environment.Nitrogen in waste water with organic nitrogen,
Ammoniacal nitrogen(NH4 +-N), nitrate nitrogen(NO3 --N)And nitrite nitrogen(NO2 --N)Etc. diversified forms exist, and ammoniacal nitrogen is most main
One of existence form wanted.Ammonia nitrogen in sanitary wastewater refers to, with nitrogen existing for free ammonia and ion ammonium form, be mainly derived from
Swill and washing sewage.The pollution sources of ammonia nitrogen are more, and discharge capacity is big, and the concentration variation discharged is greatly.
There are excess of ammonia nitrogen from the aspect of environmental pollution, in water environment can cause dissolved oxygen concentration in water body to reduce, and lead
Smelly, the deteriorating water quality of water body nigrescence is caused, the existence of aquatic animals and plants is impacted, and body eutrophication can be caused.
At present, in sanitary wastewater the processing practicability of ammonia nitrogen preferably, the country with most technologies be:Biological denitrificaion method,
Ammonia aeration vaporizing extract process, break point chlorination, chemical precipitation method, ion-exchange, liquid-film method, soil irrigation method etc..
(1)Biological denitrificaion method:Under aerobic condition, by the effect of aerobic nitrification bacterium, it is by the ammonium oxidation in waste water
Then under anoxic conditions nitrite or nitrate, utilizes denitrifying bacterium(Denitrifier)By nitrite and nitrate reduction
It is escaped for nitrogen and from waste water.
(2)Ammonia aeration vaporizing extract process:Stripping, vaporizing extract process are mainly used for removing useless gas dissolved water and some effumability objects
Matter.Gas is passed through in water, gas is made mutually to be come into full contact with water, gas dissolved water and volatile solutes is made to pass through gas-liquid circle
Face is shifted to gas phase, so as to achieve the purpose that remove pollutant.
(3)Break point chlorination:Break point chlorination is that chlorine is passed through in waste water to reach certain point, is dissociated in this in water
Chlorinity is relatively low, and the concentration of ammonia is reduced to zero.When chlorine intake is more than this, the free chlorine in water will increase, therefore,
The point is known as break, and the chlorination under the state is known as breakpoint chlorination.
(4)Chemical precipitation method:Chemical precipitation method is that Mg is added into waste water+And PO4 3-, it is allowed to answer with ammonia nitrogen generation indissoluble
Salt MgNH4PO4*6H2O(Abbreviation MAP)Crystallization, then by gravity precipitation MAP is made to be separated from waste water.
(5)Ion-exchange:The essence of ion exchange is insoluble ionic compound(Ion-exchanger)On it is commutative
The exchange reaction of ion and other same sex ions in waste water, is a kind of special adsorption process, is typically that reversible chemical is inhaled
It is attached.
(6)Liquid-film method:The mechanism of emulsion liquid membrane removal ammonia nitrogen is soluble in film phase for ammoniacal nitrogen, its high concentration outside film phase
Outside, by the diffusive migration of film phase, reach and solution dealkylation reaction occur with the acid in interior boundary, with phase in film on the inside of film phase,
The NH of generation4 +Stablize insoluble in oil phase in film in phase, inside and outside the film under the promotion of ammonia density difference, amino molecule is not open close
Film surface absorption is crossed, diffusion is migrated to desorption on the inside of film phase, so as to achieve the purpose that separation removal ammonia nitrogen.
(7)Soil irrigation method:Soil irrigation is the ammonia nitrogen waste water low concentration(<50mg/L)Fertilizer as crops comes
It uses, stable water source is both provided for irrigating region agricultural, in turn avoids body eutrophication, improves water utilization rate.
But have to pass through pretreatment, the nuisances such as removal germ, heavy metal, phenols, cyanide, oils for the waste water that soil is irrigated
Matter.
Since above-mentioned traditional treatment method is there are the shortcomings of of high cost, technical sophistication, unstable treatment effect, have
Necessity breaks away from existing treatment technology thinking, hews out the new way of ammonia nitrogen in processing sanitary wastewater, and then develops a kind of brand-new
NH3-N elimination method in the sanitary wastewater of form.
The content of the invention
To solve the deficiencies in the prior art, the present invention provides a kind of processing systems for removing ammonia nitrogen in sanitary wastewater
System, the sanitary wastewater containing ammonia nitrogen enter sump by waste line, and the outlet of sump connects coarse rack by waste line,
The major diameter solid matter in sanitary wastewater is removed at this, the outlet of coarse rack connects primary sedimentation basin by waste line,
This further removes the insoluble matter in waste water, and the outlet of primary sedimentation basin connects pH value regulating reservoir, pH value by waste line
The outlet of regulating reservoir connects crosslinked polyvinylpyrrolidone carrier adsorption cleaning system, crosslinked polyethylene pyrroles by waste line
Flue gas row's mouth of alkanone carrier adsorption cleaning system connects pickling tower by exhaust piping, and it is useless to remove to carry out pickling processes herein
Ammonia in gas, the tail gas Jing Guo purified treatment is discharged into atmospheric environment by the outlet of pickling tower by exhaust piping, while is crosslinked poly-
The discharge outlet of vinylpyrrolidone carrier adsorption cleaning system connects aeration tank by waste line, passes through aerobic aeration mistake herein
Journey, makes the various phosphorus containg substances in waste water be converted into orthophosphates, and the outlet of aeration tank connects biology by waste line and removes
Phosphorus pond, effect are to be removed the orthophosphates decomposition and inversion in waste water by bioactivity reaction process, biological phosphate-eliminating pond
Outlet connects secondary sedimentation tank by waste line, and the outlet of secondary sedimentation tank connects water purifying tank, water purifying tank by waste line
Outlet will be arranged by waste line outside purification water outlet after treatment;Wherein, crosslinked polyvinylpyrrolidone carrier adsorbs
The pond body of cleaning system uses stainless steel, is fixedly arranged in the middle of the electronic net cage slide of a circle, electronic first-class of net cage slide
Every being equipped with 10 crosslinked polyvinylpyrrolidone carrier net cages, carrier net cage heating zone is equipped with above pond body, above and below heating zone
Both sides are respectively arranged with electric heating coil, and crosslinked polyvinylpyrrolidone carrier net cage enters heating zone by the entrance on the left of heating zone,
And heating zone is left in the outlet through right side, heating zone upper right quarter is equipped with condenser pipe, and pond body lower left quarter is equipped with inlet valve, upper right
Portion is equipped with water discharging valve;The sanitary wastewater that pH value is about 6.5 ~ 8.0 after pH value adjusting processing passes through crosslinked polyethylene pyrroles
The inlet valve of alkanone carrier adsorption cleaning system lower left quarter enters inside pond body, 10 crosslinked polyvinylpyrrolidone carrier nets
Case makees rotating clockwise at a slow speed under the driving of electronic net cage slide, makes waste water with containing crosslinked polyethylene in carrier net cage
The carrier contact of pyrrolidones, crosslinked polyvinylpyrrolidone can fully adsorb ammoniacal nitrogen and partial moisture in waste water,
It adsorbs the crosslinked polyvinylpyrrolidone carrier net cage after nearly saturation and prolongs clockwise movement path and be raised to carrier net cage heating zone
Entrance, and enter inside heating zone, by the heating of electric heating coil, make crosslinked polyvinylpyrrolidone that thermal desorption occur,
The ammoniacal nitrogen and moisture of absorption are discharged with the situation of ammonia-water vapor mixture body, mixed gas after the cooling of condenser pipe,
The higher water recovery of boiling point is liquid water droplets, and in heated area's outlet return to pond body, and the relatively low ammonia of boiling point will not
It is cooled and is condensed into liquid, and be to continue with that gas form is kept to enter in the pickling tower of next processing links through gas vent, pass through
It crosses thermal desorption treated that crosslinked polyvinylpyrrolidone carrier net cage is regenerated, and prolong clockwise movement path through carrier net
Case heating zone exit is dropped to inside pond body, again with waste water and playing suction-operated, by the system purified treatment
Waste water afterwards discharges pond body by the water discharging valve of pond body upper right quarter.
Further, the pond body dischargeable capacity of crosslinked polyvinylpyrrolidone carrier adsorption cleaning system is 350m3;Crosslinking
Polyvinylpyrrolidone carrier net cage volume is 5.5m3, aperture 12mm;The operating voltage of electronic net cage slide is 380V, is turned
Speed is enclosed for 25min/.
Further, crosslinked polyvinylpyrrolidone carrier selects carrier of the artificial zeolite as crosslinked polyvinylpyrrolidone
Substance, crosslinked polyvinylpyrrolidone mass content are 40.5%.
Further, the operating voltage of the electric heating coil of crosslinked polyvinylpyrrolidone carrier adsorption cleaning system is
380V, heating temperature can reach 225 DEG C;Condenser pipe use lithium bromide refrigerating agent, refrigeration machine operating voltage be 380V, cryogenic temperature
Up to 15 DEG C.
The advantage of the invention is that:
(1)This method has broken away from existing sanitary wastewater ammonia nitrogen purified treatment principle, and creative make use of the poly- second of crosslinking
Alkene pyrrolidone(PVPP)To the Selective adsorption of ammoniacal nitrogen in water, the carbonyl in molecular structure can form hydrogen with amino chemical combination
Key complex compound mixes the artificial zeolite containing crosslinked polyvinylpyrrolidone with sanitary wastewater, it is made fully to adsorb therein
Ammonia nitrogen, so that the sanitary wastewater containing ammonia nitrogen is purified, ammonia nitrogen removal efficiency is up to 98.8%
(2)The material that this method uses is artificial zeolite and crosslinked polyvinylpyrrolidone(Crosslinked polyethylene pyrrolidines
Ketone), the two is non-toxic, so as to eliminate the risk for introducing pollutant that is new, endangering bigger;Meanwhile both materials letter
Singly it is easy to get, it is cheap, greatly reduce system operation cost.
(3)This method tail gas containing ammonia caused by it, the mode for employing pickling is purified except ammonia, net
It is good to change ammonia removal efficiency, additional pollution will not be caused to atmospheric environment.
(4)This method principle is simple and practicable, and design and construction cost is relatively low, and treatment effect is preferable, operation expense
It is very low, be conducive to promote and apply on a large scale.
Description of the drawings
Fig. 1 is the equipment schematic diagram of the present invention.
In figure:1- sumps, 2- coarse racks, 3- primary sedimentation basins, 4-pH values regulating reservoir, 5- crosslinked polyvinylpyrrolidone
Carrier adsorption cleaning system, 6- aeration tanks, 7- biological phosphate-eliminatings pond, 8- secondary sedimentation tanks, 9- water purifying tanks, 10- pickling towers
Fig. 2 is the schematic diagram of crosslinked polyvinylpyrrolidone carrier adsorption cleaning system.
51- stainless steels pond body, 52- crosslinked polyvinylpyrrolidone carriers net cage, the electronic net cage slides of 53-, 54- electrical heating
Coil, 55- inlet valves, 56- water discharging valves, 57- carrier net cages heating zone entrance, the outlet of 58- carrier net cages heating zone, 59-
Condenser pipe.
Specific embodiment
The processing method of ammonia nitrogen, the sanitary wastewater containing ammonia nitrogen pass through waste line in removal sanitary wastewater as shown in Figure 1
Into sump 1, centralized collection is carried out herein and preliminarily stabilised is adjusted, the outlet of sump 1 connects thick lattice by waste line
Grid 2 remove the major diameter solid matter in sanitary wastewater at this, and the outlet of coarse rack 2 connects primary sedimentation by waste line
Pond 3, in this insoluble matter in further removing waste water, the outlet of primary sedimentation basin 3 connects pH value by waste line and adjusts
Pond 4, waste water are neutralized and carry out the accurate adjusting of pH value herein, the pH value range of 4 water outlet of pH value regulating reservoir for 6.5 ~
8.0, it is required with the water pH value that enters for meeting crosslinked polyvinylpyrrolidone carrier adsorption cleaning system, the outlet of pH value regulating reservoir 4
Crosslinked polyvinylpyrrolidone carrier adsorption cleaning system 5 is connected by waste line, crosslinked polyvinylpyrrolidone carrier is inhaled
Flue gas row's mouth of attached cleaning system 5 connects pickling tower 10 by exhaust piping, and pickling processes are carried out at this to go in removing exhaust gas
Tail gas Jing Guo purified treatment is discharged into atmospheric environment by ammonia, the outlet of pickling tower 10 by exhaust piping, meanwhile, crosslinked polyethylene
The discharge outlet of pyrrolidones carrier adsorption cleaning system 5 connects aeration tank 6 by waste line, passes through aerobic aeration mistake herein
Journey, makes the various phosphorus containg substances in waste water be converted into orthophosphates, and the outlet of aeration tank 6 connects biology by waste line and removes
Phosphorus pond 7, effect are by bioactivity reaction process, the orthophosphates decomposition and inversion in waste water are removed, biological phosphate-eliminating pond 7
Outlet by waste line connect secondary sedimentation tank 8, at this by waste water remaining insoluble matter all remove, secondary precipitation
The outlet in pond 8 connects water purifying tank 9 by waste line, and the outlet of water purifying tank 9 will be after the system be handled by waste line
Purification water outlet outside arrange;Wherein, the pond body of crosslinked polyvinylpyrrolidone carrier adsorption cleaning system 5 uses stainless steel,
It is fixedly arranged in the middle of the electronic net cage slide 53 of a circle, and 10 crosslinked polyethylene pyrroles are equipped at equal intervals on electronic net cage slide 53
Alkanone carrier net cage 52, pond body top are equipped with carrier net cage heating zone, and heating zone is respectively arranged with electric heating coil 54 in both sides up and down, hands over
Join polyvinylpyrrolidone carrier net cage 52 by the entrance 57 on the left of heating zone into heating zone, and the outlet 58 through right side is left
Heating zone, heating zone upper right quarter are equipped with condenser pipe 59, and pond body lower left quarter is equipped with inlet valve 55, and upper right quarter is equipped with water discharging valve
56;After pH value adjusting processing(PH value is 6.5 ~ 8.0 after processing)Sanitary wastewater carried on a shoulder pole by crosslinked polyvinylpyrrolidone
The inlet valve 55 of 5 lower left quarter of body adsorption cleaning system enters inside pond body, 10 crosslinked polyvinylpyrrolidone carrier net cages
52 make rotating clockwise at a slow speed under the driving of electronic net cage slide 53, make waste water in carrier net cage 52 containing crosslinking poly-
The artificial zeolite of vinylpyrrolidone comes into full contact with, crosslinked polyvinylpyrrolidone can fully adsorb the ammoniacal nitrogen in waste water with
And partial moisture, it adsorbs the crosslinked polyvinylpyrrolidone carrier net cage 52 after nearly saturation and prolongs clockwise movement path and be raised to load
Body net cage heating zone entrance 57, and enter inside heating zone, by the heating of electric heating coil 54, make crosslinked polyethylene pyrrolidines
Thermal desorption occurs for ketone, and the ammoniacal nitrogen and moisture of absorption are discharged with the situation of ammonia-water vapor mixture body, and mixed gas is passed through
After the cooling of condenser pipe 59, the higher water recovery of boiling point is liquid water droplets, and heated area outlet 58 is back in pond body, and
The relatively low ammonia of boiling point, which will not be cooled, is condensed into liquid, and is to continue with that gas form is kept to enter next processing through gas vent
In the pickling tower 10 of link, by thermal desorption, treated that crosslinked polyvinylpyrrolidone carrier net cage 52 is regenerated, and prolongs
Clockwise movement path at carrier net cage heating zone outlet 58 through dropping to inside pond body, again with waste water and playing absorption
Effect, the waste water after the system purified treatment discharges pond body by the water discharging valve 56 of pond body upper right quarter, into next processing
Link;Wherein, the effect of pH value regulating reservoir 4 is will to be adjusted by the pH value of waste water of primary sedimentation to 6.5 ~ 8.0, to meet crosslinking
Polyvinylpyrrolidone carrier adsorption cleaning system 5 enters the requirement of water pH value;Wherein, the effect of aeration tank 6 is by aerobic exposure
Gas process makes the phosphorus containg substances in waste water be converted into orthophosphates;Wherein, the effect in biological phosphate-eliminating pond 7 is living by biology
Property reaction process, the orthophosphates decomposition and inversion in waste water removes it from waste water.
By the system treated sanitary wastewater, ammonia nitrogen removal efficiency is up to 98.8%.