CN102690018B - Method for treating and recycling coal tar processing wastewater - Google Patents

Method for treating and recycling coal tar processing wastewater Download PDF

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Publication number
CN102690018B
CN102690018B CN201210133460.2A CN201210133460A CN102690018B CN 102690018 B CN102690018 B CN 102690018B CN 201210133460 A CN201210133460 A CN 201210133460A CN 102690018 B CN102690018 B CN 102690018B
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treatment
pond
charcoal
water
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CN102690018A (en
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王旭
冯卫强
魏剑峰
代军
鞠兴华
金旭东
刘泽南
张丽红
张执远
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ZHONGHUAN LIAONING ENGINEERING TECHNOLOGY CO LTD
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ZHONGHUAN LIAONING ENGINEERING TECHNOLOGY CO LTD
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Abstract

The invention relates to the technical field of coal tar processing wastewater treatment and recycle, in particular to a method for treating and recycling coal tar processing wastewater. The method is characterized by being a combined technological method including pretreatment, biological treatment and post-treatment, and comprises the processing steps that: 1) a pretreatment device comprises an oil separation tank, a gas flotation tank, and a hydrolysis and acidification regulation tank connected in sequence; 2) a biochemical treatment device comprises a short-range nitrification tank, an anaerobic ammonium oxidation tank, and an aerobic biological carbon tank connected in sequence; and 3) for the water quality of the discharged water after post-treatment, the COD is lower than 70mg/L, SS is lower than 1 mg/L, and chrominance is less than 15 times. Compared with the prior art, the method of the invention has the beneficial effects that: the biochemical property of the waste water is enhanced by finishing hydrolytic acidification in the regulation tank; and the biological treatment is strengthened through an effective combination of the short-range nitrification tank, the anaerobic ammonium oxidation tank, and the aerobic biological carbon tank; the problem that the coal tar processing wastewater is difficult to reach the standards is solved, and the purpose of recycling the wastewater is achieved.

Description

A kind of method of coal tar processing wastewater treatment and renovation
Technical field
The present invention relates to coal tar processing wastewater treatment and reuse technology field, particularly a kind of method of coal tar processing wastewater treatment and renovation.
Background technology
Coal tar processing factory effluent has high ammonia nitrogen, high oil-containing, high toxicity, low B/C than feature, belongs to highly difficult trade effluent.At present, the treatment process of domestic this type of waste water mainly adopts A/O and AA/O technique, and these techniques mainly adopt gravitational separation process, absorption method for oily substance, and oily substance clearance is only 20-30%, treatment effect is not satisfactory, for follow-up biochemical treatment has brought great difficulty.Due to the limitation of more fragile, the traditional denitrification reaction mechanism of biochemical system self capacity of resisting impact load, add the pressure that pretreatment stage brings, make system water outlet COD degraded not exclusively, mineralized nitrogen is not thorough, after processing, water outlet can only maintain < < integrated wastewater discharge standard > > secondary standard, be that leading indicator is COD≤150mg/L, ammonia nitrogen≤25mg/L.
Some enterprise adopts the method that strengthens cut back tar waste water, systemic contamination substrate concentration is declined to a great extent, thereby water outlet can reach < < integrated wastewater discharge standard > > first discharge standard, be that leading indicator is COD≤100mg/L, ammonia nitrogen≤15mg/L.But a large amount of dilution waste water has increased the processing load at biochemical station, virtually increased energy consumption and the expense of sewage disposal, make enterprise bear huge economical load, run counter to the principle of cleaner production.
Summary of the invention
The object of this invention is to provide a kind of method of coal tar processing wastewater treatment and renovation, overcome the deficiencies in the prior art, the combination process that employing comprises pre-treatment, biological treatment and aftertreatment, reduce COD and ammonia nitrogen value in coal tar processing waste water, make effluent quality reach national grade one discharge standard recyclable recycling.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A method for coal tar processing wastewater treatment and renovation, is the combined technical method that comprises pre-treatment, biological treatment and aftertreatment, wherein specifically comprises following processing step:
1), in pre-treatment, treatment facility comprises that oil trap, air flotation pool and acidication equalizing tank are connected in sequence, the influent quality of coal tar processing waste water: COD 3000~6000mg/L, NH 3-N 100~250mg/L, volatile phenol 800~1200mg/L, prussiate 20~50mg/L, 200~800 times of colourities, petroleum-type 100~400mg/L, SS 200~400mg/L, pH 8~10, process oil trap and air flotation pool are first by the heavy oil in waste water, light oil, oil in water emulsion, SS and part color removal, through acidication equalizing tank, carry out water quality and quantity adjusting again, utilize acidication function to improve the biochemical of water, make ring-type in waste water, the larger molecular organics of long-chain shape is hydrolyzed into small organic molecule, reduce its toxicity and refractory organics, the oil-containing < 10mg/L of pre-treatment water outlet, SS (suspended substance) < 30mg/L, 200 times of colourity <,
2) in biochemical treatment, treatment facility comprises short distance nitration pond, anaerobic ammonium oxidation tank and aerobic charcoal pond connect to form successively, aerobe charcoal connects charcoal collecting tank behind pond, charcoal collecting tank underflow is connected with aerobe charcoal pond, the overflow of charcoal collecting tank enters aftertreatment flow process, short distance nitration pond, anaerobic ammonium oxidation tank and aerobic charcoal pond are integral type building, in described short distance nitration pond and anaerobic ammonium oxidation tank, all hang with fibrous bundle as filler, utilize microorganism in different ponds to remove the organic and inorganic pollutant of major part in coal tar processing waste water, effluent quality COD < 100mg/L after biochemical treatment, NH 3-N < 5mg/L, prussiate, volatile phenol < 0.5mg/L,
3) in aftertreatment, treatment facility comprises coagulative precipitation tank, sludge thickener, filtering equipment and sand filter, activated carbon filtration equipment, essence filter equipment composition, before coagulative precipitation tank, be provided with line mixer, the overflow of coagulative precipitation tank is successively through sand filter, activated carbon filtration equipment, essence filter device processes, the underflow of coagulative precipitation tank is successively through sludge thickener, filtering equipment processing, utilize coagulant sedimentation and physical filtering method further to remove the solids content in waste water, effluent quality COD < 70mg/L after processing, SS (suspended substance) < 1mg/L/, 15 times of colourity <.
Described acidication equalizing tank is provided with diving mixer at the bottom of pond, and controlling the pool inner water power residence time (HRT) is 8-9 hour, and temperature is 30~35 ℃, is used for improving the biochemical property of waste water.
In described short distance nitration pond, pH is 7.5~7.8, and temperature is 30~35 ℃, and HRT is 28~30h, and dissolved oxygen is 2.8~3.5mg/L, and described short distance nitration pool volume is loaded lower than 0.25gNH 4 +-N/ (Ld).
In described anaerobic ammonium oxidation tank, temperature is 33~37 ℃, and pH is 7.6~8.4, and dissolved oxygen is less than 0.2mg/L, requires water inlet NH 4 +/ NO 2 -for (1~1.5): 1, water inlet NO 2 -the concentration of N is less than 95mg/L;
Described anaerobic ammonium oxidation tank water intake mode is turning spurt water device pulse water distribution.
Described aerobe charcoal adds activated carbon grain in pond, and in aerobe charcoal pond, temperature is 27~30 ℃, and pH is 7.0~7.5, and dissolved oxygen is 3~4mg/L, and volumetric loading is lower than 0.12gNO 2 --N/ (Ld).
Described charcoal collecting tank HRT is 1.5~2h.
Described line mixer adopts 2 dosing methods, wherein in line mixer prime, be provided with flocculation agent PAC chemicals dosing plant, in line mixer stage casing, be provided with coagulant aids PAM chemicals dosing plant, the described PAC concentration of making up a prescription is 3-3.5%, adding consistency is 30-32mg/L, the described PAM concentration of making up a prescription is 2-2.5 ‰, and adding consistency is 6-8mg/L.
Compared with prior art, the invention has the beneficial effects as follows: 1) this is a kind of new combination process for coal tar processing waste water.2) by complete acidication in equalizing tank, improve the biochemical of waste water, reached the economic benefits and social benefits function of " regulating hydrolysis ".3) short distance nitration pond, anaerobic ammonium oxidation tank and aerobe charcoal pond are effectively combined, utilized the absorption degradation function in aerobe charcoal pond, strengthened biochemical treatment; 4) in aftertreatment, adopt the mode of sand filtration-activated-carbon filter-essence filter to being for further processing through coagulating sedimentation sewage after treatment, both solved the problem of coal tar processing wastewater effluent difficulty up to standard, reached again the object of reuse.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention processing technological flow schematic diagram.
Map: I- pretreatment part II- part of the biochemical treatment of III- post processing part of the A- B- C- heavy oil of coal tar wastewater by air flotation scum D- backflow sludge biological carbon E- F- effluent efflux G- water H- filter liquid reflux K- mud cake Sinotrans P1- wastewater lift pump P2- aerobic water pump water pump P4- P3- anaerobic biological carbon return pump P5- sand filtration water pump P6- fine filter water pump P7- reuse water pump P8- residual sludge pump P9- for sludge pump BQ- aeration fan BS- rotating water distributor HH- pipeline mixer 1- oil separation tank 2- floatation dosing system 3- floatation pool 4- hydrolytic acidification pond pool 6- 5- shortcut nitrification anaerobic ammonia oxidation pool 7- aerobic biological carbon pool of 8- biological carbon collection pool 9- flocculant dosing device 10- PAM PAC coagulant dosing device 11- coagulation sedimentation tank 12- sand filter 13- activated carbon filtration equipment 14- filtration equipment 15- reuse pool 16- sludge thickening tank 17- filter press equipment.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Seeing Fig. 1, is the method processing technological flow schematic diagram of a kind of coal tar processing wastewater treatment and renovation of the present invention, and this is a kind of combined technical method that comprises pre-treatment, biological treatment and aftertreatment, and its technical process is as follows:
1) in preprocessing part I, treatment facility comprises oil trap 1, air flotation pool 3 and acidication equalizing tank 4 are connected in sequence, coal tar processing waste water A enters oil trap 1 through pipe network, at the bottom of pond, heavy oil B transports outward after collecting, the water outlet of oil trap 1 is delivered to air flotation pool 3 through waste water lifting pump P1, outward transport after air supporting scum silica frost C collects, air supporting medicine system 2 adds air flotation pool 3 by the medicament configuring, air flotation pool 3 water outlets enter acidication equalizing tank 4, process oil trap 1 and air flotation pool 3 are first by the heavy oil in waste water, light oil, oil in water emulsion, SS (suspended substance) and part color removal, through acidication equalizing tank 4, carry out water quality and quantity adjusting again, utilize acidication function to improve the biochemical of water, make ring-type in waste water, the larger molecular organics of long-chain shape is hydrolyzed into small organic molecule, reduce its toxicity and refractory organics, the oil-containing < 10mg/L of pre-treatment water outlet, SS < 30mg/L, 200 times of colourity <,
Acidication equalizing tank is provided with diving mixer at the bottom of 4 ponds, adds hydrolysis and acid-producing bacteria in pond, and controlling the pool inner water power residence time (HRT) is 8-9 hour, and temperature is 30~35 ℃, is used for improving the biochemical property of waste water.
2) in biochemical treatment part II, treatment facility comprises short distance nitration pond 5, anaerobic ammonium oxidation tank 6 and aerobic charcoal pond 7 connect and compose successively, behind aerobe charcoal pond 7, connect charcoal collecting tank 8, 4 water outlets of acidication equalizing tank are delivered to short distance nitration pond 5 through aerobic intake pump P2, Aeration fan BQ carries out oxygen supply for short distance nitration pond 5 continuously, 5 water outlets of short distance nitration pond enter anaerobic ammonium oxidation tank 6 through anaerobism intake pump P3 and turning spurt water device BS, anaerobic ammonium oxidation tank 6 water outlets enter aerobe charcoal pond 7 by run by gravity, 7 water outlets of aerobe charcoal pond enter charcoal collecting tank 8, charcoal collecting tank 8 is back to aerobe charcoal pond 7 by charcoal reflux pump P4 by the charcoal D that refluxes, short distance nitration pond 5, anaerobic ammonium oxidation tank 6 and aerobic charcoal pond 7 are integral type building, the interior fibrous bundle that all hangs with of short distance nitration pond 5 and anaerobic ammonium oxidation tank 6 is as filler, utilize microorganism in different ponds to remove the organic and inorganic pollutant of major part in coal tar processing waste water, effluent quality COD < 100mg/L after biochemical treatment, NH3-N < 5mg/L, prussiate, volatile phenol < 0.5mg/L,
The interior pH in short distance nitration pond 5 is 7.5~7.8, and temperature is 30~35 ℃, and HRT is 28~30h, and dissolved oxygen is 2.8~3.5mg/L, and short distance nitration pool volume is loaded lower than 0.25gNH 4 +-N/ (Ld).
The interior temperature of anaerobic ammonium oxidation tank 6 is 33~37 ℃, and pH is 7.6~8.4, and dissolved oxygen is less than 0.2mg/L, requires water inlet NH 4 +/ NO 2 -for (1~1.5): 1, water inlet NO 2 -the concentration of-N is less than 95mg/L; Anaerobic ammonium oxidation tank water intake mode is turning spurt water device pulse water distribution, makes sewage and microorganism uniform contact.
In aerobe charcoal pond 7, add activated carbon grain, in aerobe charcoal pond, temperature is 27~30 ℃, and pH is 7.0~7.5, and dissolved oxygen is 3~4mg/L, and volumetric loading is lower than 0.12gNO 2 --N/ (Ld).The HRT of charcoal collecting tank 8 is 1.5~2h.
3) in aftertreatment part III, treatment facility comprises coagulative precipitation tank 11, sludge thickener 16, filtering equipment 17 and sand filter 12, activated carbon filtration equipment 13, essence filter equipment 14 forms, 8 water outlets of charcoal collecting tank enter coagulative precipitation tank 11 by line mixer HH, flocculation agent PAC chemicals dosing plant 9 and coagulant aids PAM chemicals dosing plant 10 are added to flocculation agent and coagulant aids in line mixer HH respectively, the excess sludge E of coagulative precipitation tank 11 delivers to sludge thickener 16 through residual sludge pump P8, mud after sludge thickener 16 is concentrated is delivered to filtering equipment 17 through sludge pump P9, the pressing filtering liquid backflow H that filtering equipment 17 produces is back to acidication equalizing tank 4, the mud cake K outward transport of filtering equipment 17, coagulative precipitation tank 11 water outlet F can standard discharge, also can deliver to sand filter 12 through sand filtration intake pump P5, sand filter 12 water outlets enter activated carbon filtration equipment 13, 13 water outlets of activated carbon filtration equipment are delivered to smart filter equipment 14 through smart filter influent pump P6, 14 water outlets of essence filter equipment enter reuse pool 15, reuse pool 15 water outlets are delivered to reuse water user by reuse water pump P7 by reuse water G.This operation utilizes coagulant sedimentation and physical filtering method further to remove the solids content in waste water, 15 times of effluent quality COD < 70mg/L, SS < 1mg/L/, colourity < after processing.
Line mixer adopts 2 dosing methods, wherein in line mixer HH prime, be provided with flocculation agent PAC chemicals dosing plant, in line mixer stage casing, be provided with coagulant aids PAM chemicals dosing plant, the described PAC concentration of making up a prescription is 3-3.5%, adding consistency is 30-32mg/L, the described PAM concentration of making up a prescription is 2-2.5 ‰, and adding consistency is 6-8mg/L.
In production take certain coal tar processing enterprise (industrial scale is processed reuse as example as 26.5 ten thousand tons/Coal Tar Wastewater a):
1) process the water yield: 60m 3/ d
2) influent quality, in Table 1:
Table 1
Figure BDA0000159641710000051
3) effluent quality, in Table 2:
Table 2
4) attached national grade one discharge standard is in Table 3:
Table 3
Figure BDA0000159641710000053
5) system main design parameters:
(1) main units
1 of oil trap: 5 × 2 × 1.5m; 1 of acidication equalizing tank: 4 × 3.6 × 2.5m; 2 of short distance nitration pond: 6 × 3.3 × 3.5m; 2 of anaerobic ammonium oxidation tank: 6 × 2.1 × 3.5m; 2 of aerobe charcoal pond: 6 × 2.6 × 3.5m; 1 of charcoal collecting tank: 3 × 2.4 × 2.5m; Coagulative precipitation tank: Ф=2m, 1 of H=2.5m; Sludge thickener: Ф=1.5m, 1 of H=2.5m; 1 of reuse pool: 3 × 2.5 × 2.5m.
(2) major equipment
Aeration fan: Q=9.48m 3/ min, P=12KW, 2 (the using and the reserved); Waste water lifting pump: Q=4m 3/ h, P=0.75KW, H=20m, 2 (the using and the reserved); Aerobic intake pump: Q=4m 3/ h, P=0.75KW, H=20m, 2 (the using and the reserved); Anaerobism intake pump: Q=4m 3/ h, P=0.75KW, H=20m, 2 (the using and the reserved); Residual sludge pump: Q=2.5m 3/ h, P=0.55KW, H=17m, 2 (the using and the reserved); Charcoal reflux pump: Q=2.5m 3/ h, P=0.55KW, H=17m, 2 (the using and the reserved); Sludge pump: Q=2.5m 3/ h, P=0.55KW, H=17m, 2 (the using and the reserved); Reuse water pump: Q=4m 3/ h, P=0.75KW, H=20m, 2 (the using and the reserved); Dosing pump: Q=25L/h, P=0.25KW, 4 (dual-purpose two standby); Airfloat equipment: Q=3m 3/ h, main engine power 3.6KW, dross power 0.37KW, air compressor machine power 1.5KW, air dissolved pump power 0.75KW (); Quartz sand filtration tank: Ф=0.8m, H=2m, 2; Activated carbon filtration tank: Ф=0.8m, H=2m, 2; Essence filter tank: Ф=0.8m, H=2m, 2; Pressure filter: Q=2m3/h, P=1.5KW.

Claims (1)

1. a method for coal tar processing wastewater treatment and renovation, is characterized in that, is the combined technical method that comprises pre-treatment, biochemical treatment and aftertreatment, wherein specifically comprises following processing step:
1), in pre-treatment, treatment facility is connected in sequence by oil trap, air flotation pool and acidication equalizing tank, the influent quality of coal tar processing waste water: COD3000~6000mg/L, NH 3-N100~250mg/L, volatile phenol 800~1200mg/L, prussiate 20~50mg/L, 200~800 times of colourities, petroleum-type 100~400mg/L, ss suspended solid 200~400mg/L, pH8~10, process oil trap and air flotation pool are first by the heavy oil in waste water, light oil, oil in water emulsion, SS and part color removal, through acidication equalizing tank, carry out water quality and quantity adjusting again, utilize acidication function to improve the biochemical of water, make ring-type in waste water, the larger molecular organics of long-chain shape is hydrolyzed into small organic molecule, reduce its toxicity and refractory organics, the oil-containing <10mg/L of pre-treatment water outlet, SS<30mg/L, colourity <200 doubly,
2) in biochemical treatment, treatment facility is by short distance nitration pond, anaerobic ammonium oxidation tank and aerobic charcoal pond connect to form successively, aerobe charcoal connects charcoal collecting tank behind pond, charcoal collecting tank underflow is connected with aerobe charcoal pond, the overflow of charcoal collecting tank enters aftertreatment flow process, short distance nitration pond, anaerobic ammonium oxidation tank and aerobic charcoal pond are integral type building, in described short distance nitration pond and anaerobic ammonium oxidation tank, all hang with fibrous bundle as filler, utilize microorganism in different ponds to remove the organic and inorganic pollutant of major part in coal tar processing waste water, effluent quality COD<100mg/L after biochemical treatment, NH 3-N<5mg/L, prussiate, volatile phenol <0.5mg/L,
3) in aftertreatment, treatment facility is by coagulative precipitation tank, sludge thickener, filtering equipment and sand filter, activated carbon filtration equipment, essence filter equipment composition, before coagulative precipitation tank, be provided with line mixer, the overflow of coagulative precipitation tank is successively through sand filter, activated carbon filtration equipment, essence filter device processes, the underflow of coagulative precipitation tank is successively through sludge thickener, filtering equipment processing, utilize coagulant sedimentation and physical filtering method further to remove the solids content in waste water, effluent quality COD<70mg/L after processing, SS<1mg/L/, colourity <15 doubly,
Described acidication equalizing tank is provided with diving mixer at the bottom of pond, and controlling the pool inner water power residence time (HRT) is 8-9 hour, and temperature is 30~35 ℃, is used for improving the biochemical property of waste water;
In described short distance nitration pond, pH is 7.5~7.8, and temperature is 30~35 ℃, and HRT is 28~30h, and dissolved oxygen is 2.8~3.5mg/L, and described short distance nitration pool volume is loaded lower than 0.25gNH 4 +-N/ (Ld);
In described anaerobic ammonium oxidation tank, temperature is 33~37 ℃, and pH is 7.6~8.4, and dissolved oxygen is less than 0.2mg/L, requires water inlet NH 4 +/ NO 2 -for (1~1.5): 1, water inlet NO 2 -the concentration of-N is less than 95mg/L;
Described aerobe charcoal adds activated carbon grain in pond, and in aerobe charcoal pond, temperature is 27~30 ℃, and pH is 7.0~7.5, and dissolved oxygen is 3~4mg/L, and volumetric loading is lower than 0.12gNO 2 --N/ (Ld);
Described charcoal collecting tank HRT is 1.5~2h;
Described line mixer adopts 2 dosing methods, wherein in line mixer prime, be provided with flocculation agent PAC chemicals dosing plant, in line mixer stage casing, be provided with coagulant aids PAM chemicals dosing plant, the described PAC concentration of making up a prescription is 3-3.5%, adding consistency is 30-32mg/L, the described PAM concentration of making up a prescription is 2-2.5 ‰, and adding consistency is 6-8mg/L.
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