CN105236667A - Closed treatment method for wood-tar processing wastewater - Google Patents
Closed treatment method for wood-tar processing wastewater Download PDFInfo
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- CN105236667A CN105236667A CN201410335994.2A CN201410335994A CN105236667A CN 105236667 A CN105236667 A CN 105236667A CN 201410335994 A CN201410335994 A CN 201410335994A CN 105236667 A CN105236667 A CN 105236667A
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Abstract
The invention discloses a treatment method for wood-tar processing wastewater and belongs to the field of sewage treatment. The method is characterized by consisting of the following steps: (1) firstly treating the wood-tar processing wastewater with a swirling unit; (2) enabling the swirling unit treated wastewater to enter a compact type air-floatation unit for treatment; (3) enabling the compact-type air-floatation treated wastewater to enter an organic matter separation and recovery unit; (4) enabling the organic matter separation and recovery unit treated wastewater to enter an anaerobic biochemical unit for treatment; (5) enabling the anaerobic biochemical treated wastewater to enter a biological-fluidized-bed aerobic biochemical unit; (6) enabling the biological-fluidized-bed unit treated wastewater to enter an advanced oxidation unit; and (7) enabling the advanced-oxidation treated wastewater to enter a fluidized-sand filter unit. Through treating the wood-tar acidic processing wastewater by using scheme-suggested process flows, the treated sewage meets sewage reuse index requirements and can be recycled to a circulating water system, and organic chemical products with economic values such as methanol can be recovered.
Description
Technical field
The invention belongs to technical field of sewage, be specifically related to a kind for the treatment of process of high concentrated organic wastewater.
Background technology
Biomass fuel is a kind of renewable substitute energy, and wood tar oil produces the key areas that oil fuel technology is biomass fuel research and development.Low-grade biomass energy can be converted into the wood tar oil of the liquid state of higher quality by Biomass-pyrolysis.Produce a certain amount of high density organic acidity waste water in the wood tar oil course of processing, this waste water material composition is complicated, except containing except organic granular, also containing materials such as methyl alcohol, ethanol, formic acid, acetic acid.Waste water COD is up to hundreds thousand of, and ammonia nitrogen concentration is higher.This waste water, because belonging to hazardous and noxious substances containing methyl alcohol, has anesthetic action to human central nervous system, permeates the ground and easily causes groundwater pollution.Sewage treatment process needs airtight carrying out.
Chinese patent CN03110880.6 discloses a kind for the treatment of process of wastewater containing methyl alcohol in low concentration, it is first lowered the temperature by heat exchange condensation and aeration and makes wastewater temperature be down to less than 35 DEG C, again mixed solution is delivered in disc filter and filter, the impurity generated after removing waste water mixing, then send in artificial immobilized biological activated carbon hay tank and process the small molecules organic pollutants such as methyl alcohol.The method technical process is simple, dense to COD, methanol concentration be about 8% wood tar oil waste water be difficult to realize qualified discharge process.
Chinese patent CN200610104738.8 discloses a kind of gas field methanol sewage disposal process patent, oil-and-methanol contained wastewater processing scheme is provided, sewage is after oil removing, reconciling pH value, iron removal by oxidation, flocculating settling pretreatment technology, passing through with rectifying tower is the methanol recovery process device process of core again, from sewage, isolate methyl alcohol, finally realize the object on Methanol Recovery and separating methanol waste water reinjection stratum.This invention only can play certain Effect of Pretreatment for the treatment of wood tar oil waste water, and still containing the organism such as poisonous and hazardous methyl alcohol in waste water, and COD after process is still very high, even more than 10000mg/l.Therefore this technique is difficult to effective process to wood tar oil waste water.The present patent application is mainly in conjunction with wood tar oil water quality characteristics for this reason, studies waste water treatment process that is most economical, that be suitable for, makes the waste water after process reach reuse requirement.
Summary of the invention
The invention provides a kind of wood tar oil processing waste water closed processes technique, Separation and Recovery recycling is carried out to the sump oil in waste water and organism, the technical problem of qualified discharge process is difficult to solve wood tar oil waste water in prior art, and realize utilization of wastewater resource, the sewage after process is made to reach reuse requirement, simultaneously owing to containing toxic and volatile organic compound in sewage, therefore each cell process is optimized, realize sewage device, closed processes, stop organic compound and to volatilize the secondary pollution caused.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of wood tar oil processing waste water closed processes method, is characterized in that being made up of following step:
1) wood tar oil processing waste water is first through swirling flow unit process;
2) after swirling flow unit process, the process of compact type air flotation cell is entered;
3) waste water after compact type air-flotation process enters organism Separation and Recovery unit;
4) after the process of separating organic matters recovery unit, waste water enters anaerobic biological cell processing again;
5) waste water after anaerobic biological cell processing enters biological fluidized bed aerobic biochemical unit;
6) after biological fluidized bed aerobic biochemical cell processing, then advanced oxidation unit is entered;
7) waste water after advanced oxidation cell processing enters shifting sand filter unit, and wood tar oil waste water can reach the requirement of reusing sewage water-quality guideline after running sand filtration process.
A kind of wood tar oil processing waste water of the present invention closed processes method, it is further characterized in that: first wood tar oil processing waste water adopts cyclonic separation, the oils in waste water and suspended substance are fully separated by compact type air-flotation process technique.In separating organic matters recovery unit, utilize rectifying tower by separating organic matters, concentrate, recovery in waste water; The waste water COD concentration that rectifying separation reclaims is also higher, enters anaerobic reactor afterwards and reduces organic concentration and bio-toxicity further, improve wastewater biodegradability simultaneously; Waste water enters organism fluidization bed unit afterwards, carries out aerobic biochemical closed processes, and the waste water after biochemical treatment carries out advanced oxidation process, and last waste water is finally processed by running sand filtration unit.
A kind of wood tar oil processing waste water of the present invention closed processes method, it is further characterized in that: step 1) described in cyclonic separation unit refer to traditional hydro-cyclones.Its principle is the density difference utilizing two kinds of liquid, produces centrifugal force and is separated from water by oil droplet, realize oily water separation by liquid high speed rotating in cyclone pipe.By cyclonic separation, more than 15 μm oil droplets are removed substantially.Wood tar oil waste water contains a large amount of sump oil and a small amount of suspended solid, and hydrocyclone is separated oil slick, removes a small amount of suspended substance, and the oil-contg after separation is less than 500mg/l.
A kind of wood tar oil processing waste water of the present invention closed processes method, it is further characterized in that: step 2) described in compact type air flotation cell be a kind of compact construction, profit rapid separation, is applicable to oil or other the fine suspended particle of removing sewage.Its principle utilizes tubular type microbubble generator, in pending sewage, be mixed into a large amount of micro bubbles, and the oil droplet in oily(waste)water to be attached to very soon on bubble and to be formed " oil droplet-bubble adhesion body ".Containing a large amount of oil droplet-bubble adhesion body under the dual function of gravity and centrifugal force, realize the separation of profit and suspended substance.Compact type air flotation cell be mainly used to process in waste water by natural subsidence or floating be difficult to the oil in water emulsion removed or relative density close to 1 small suspended particle.Adopt compact type air supporting can realize the airtight separating treatment of profit and suspended substance, the oil-contg after separation is less than 50mg/l.
A kind of wood tar oil processing waste water of the present invention closed processes method, it is further characterized in that: step 3) described in separating organic matters reclaim and refer to Separation and Recovery is carried out to organism such as methyl alcohol in wood tar oil waste water, wood tar oil waste water methanol concentration about 8%, methyl alcohol has and belongs to hazardous and noxious substances, there is anesthetic action to human central nervous system, permeate the ground and easily cause groundwater pollution.The present invention adopts hypergravity highly efficient distilling equipment, carries out Methanol Recovery.Hypergravity highly efficient distilling equipment is made up of the rotor of one or more high speed rotating, and gas-liquid flows through rotor in reverse baffling mode, carries out contact mass transfer, and the hypergravity bed of 1.2 meters high is equivalent to the conventional rectifying tower of 15 meters high.Reclaim methyl alcohol by rectifying, by rectifying, the methanol content in waste water is controlled below 0.5%.Wood tar oil waste water is after oil removing and organism are reclaimed, and COD concentration is still very high, and COD is 5000 ~ 30000mg/l.
A kind of wood tar oil processing waste water of the present invention closed processes method, it is further characterized in that: step 4) described in anaerobic biological unit refer to the organic pollutant utilizing facultative anaerobe and obligatory anaerobic bacteria to come in degradation of sewage or mud, the final product decomposed is the digestion gas (i.e. biogas) based on methane, and biogas can as energy utilization.Anaerobic biochemical treatment technology is usually used in processing organic sludge, high concentration organic sewage.This anaerobic biological can select IC anaerobic technique technology, and this technology residence time is short and small in 20 hours.Wood tar oil waste water is after anaerobic biochemical treatment, and COD is less than 3000mg/l, and ammonia nitrogen is less than 80mg/l.
A kind of wood tar oil processing waste water of the present invention closed processes method, it is further characterized in that: step 5) described in biological fluidized bed be a kind of gas, liquid, solid three-phase and deposit, and be in the reactor types under the inner circulation fluidized state of high speed.Biological fluidized-bed reactor is a kind of active sludge and biomembranous combination, it is using many tiny particles as biomembranous carrier, carrier can use quartz sand, particle charcoal, flue dust, polyethylene ring etc., its surface is long certain thickness microbial film, attached biological film on solid carrier, making activated sludge concentration reach 40 ~ 50g/L, is 10 ~ 20 times of activated sludge process.Surface has that biomembranous carrier is fluidization at dynamic action, and particle acutely runs, and makes sewage, is fully contacted between air with microbial film, improves the utilization ratio of oxygen, and the treatment effect of reactor is obviously strengthened.Biological fluidized bed can realize the closed processes of sewage aerobic biochemistry.After biological fluidized bed process, COD is less than 60mg/l, and ammonia nitrogen is less than 15mg/l.
A kind of wood tar oil processing waste water of the present invention closed processes method, it is further characterized in that: step 6) described in advanced oxidation unit refer to the oxidizing procesies such as ozone, dioxide peroxide, hydrogen peroxide, advanced oxidation processes can not only reduce BOD, COD in water, but also can play decolouring, deodorizing, taste removal, sterilization, kills the functions such as algae.The present invention adopts dioxide peroxide Quick Oxidation method, and dioxide peroxide generally only plays oxygenizement, and do not play chlorization, much less is wanted in the trichloromethane geometric ratio chlorine disinfectant that therefore it and impurities in water are formed.Dioxide peroxide also not with ammonia effect, be that germ-killing efficiency in 6 ~ 10 scopes affects by pH value hardly in pH value.The disinfecting power of dioxide peroxide inferior to ozone, but higher than chlorine.Compare with ozone, its superior part is that it has residue sterilisation effect, but without chlorine smell.Dioxide peroxide has very strong except phenol ability.After process, COD is less than 50mg/l, and ammonia nitrogen is less than 10mg/l.
A kind of wood tar oil processing waste water of the present invention closed processes method, it is further characterized in that: step 7) described in shifting sand filter unit be that one can be carried out filtering layer cleaning automatically, continuously and upgraded filtration unit, this filter plant can remove suspended substance and colloid substances in former water (or waste water) effectively.When water treatment and sewage purification, by sand beds removing suspended solid and other impurity, in filtration procedure, filtering layer slowly flows downward, and the filtrate after filtration enters filter tank and carries out next filtration cycle after promoting cleaning.Wood tar oil waste water can reach the requirement of reusing sewage water-quality guideline after running sand filtration process.
The invention has the beneficial effects as follows:
1) technical process of Utilization plan proposition, processes the acid processing waste water of wood tar oil.Sewage after process reaches reusing sewage index request, can be back to circulating water system.
2) Organic chemical products that methyl alcohol etc. has economic worth is reclaimed.
3) realize waste disposal plant, integrated, closure process, save floor space, reduce the discharge of toxic and volatile material and foul gas simultaneously.
4) adopt advanced combined sewage treating process, easy and simple to handle, be easy to management, the system that ensures is long, steady, full to be run.
Accompanying drawing explanation
A kind of wood tar oil processing waste water of Fig. 1 the present invention closed processes process flow sheet
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing specific embodiment, but these embodiments do not limit the scope of the invention.
Certain wood tar oil processing waste water material composition and content are in table 1.
Table 1 wood tar oil waste water composition and content
| Composition | Methyl alcohol | Ethanol | Formic acid | Acetic acid | Water | Other |
| Content, % | 7.6 | 1.1 | 0.3 | 4.0 | 86.5 | 0.5 |
As can be seen from Table 1, this waste water contains the organic substance such as methyl alcohol, acetic acid of higher concentration, and this material can be recycled, and has certain economic value.
By carrying out correlation parameter analysis to waste water quality, result shows, and this wastewater oil content about 1.6%, COD about 18%, waste water quality is in table 2.
Table 2 wood tar oil waste water quality
| Composition project | Oil/mg.L -1 | COD/mg.L -1 | Ammonia nitrogen/mg.L -1 | PH value |
| Sour water | 16090 | 1.8×10 5 | 175.9 | 5.4 |
Specific embodiment of the invention scheme is: first wood tar oil waste water adopt cyclonic separation, is substantially removed by more than 15 μm oil droplets by cyclonic separation, and hydrocyclone is separated oil slick, removes a small amount of suspended substance, and the oil-contg after separation is less than 500mg/l.Then enter compact type air-floating apparatus, be mainly used to process in waste water by natural subsidence or floating be difficult to the oil in water emulsion removed or relative density close to 1 small suspended particle.Adopt compact type air supporting can realize the airtight separating treatment of profit and suspended substance.Oil-contg after separation is less than 50mg/l.After two-stage oil removing oil removal, enter organism Separation and Recovery unit, utilize rectifying tower by separating organic matters, concentrate, recovery in waste water, reclaim methyl alcohol by rectifying, by rectifying, the methanol content in waste water is controlled below 0.5%.Wood tar oil waste water is after oil removing and organism are reclaimed, and COD concentration is still very high, and COD is 5000 ~ 30000mg/l.The waste water COD concentration that rectifying separation reclaims is also higher, and waste water enters IC anaerobic biochemical reactor again and reduces organic concentration and bio-toxicity further, improves wastewater biodegradability simultaneously, and anaerobic biological hydraulic detention time is 15 hours.Waste water after anaerobic biochemical treatment enters organism fluidization bed unit, carry out aerobic biochemical closed processes, the present invention adopts two-stage biological fluidized-bed tandem process, one-level biological fluidized bed design hydraulic detention time is 8 hours, two stage biological design of Fluidized bed hydraulic detention time is 12 hours, after biological fluidized bed process, COD is less than 60mg/l, and ammonia nitrogen is less than 15mg/l.Waste water after biochemical treatment carries out advanced oxidation processing unit, the present invention adopts dioxide peroxide Quick Oxidation method, is reduced BOD, COD in water, decolours to waste water, deodorizing, taste removal, sterilization, kills algae process by oxidation, after process, COD is less than 50mg/l, and ammonia nitrogen is less than 10mg/l.Last waste water quicksand filtering unit carries out deep purifying process, and processed waste water reaches reuse requirement.
Claims (7)
1. a wood tar oil processing waste water closed processes method, is characterized in that being made up of following step:
1) wood tar oil processing waste water is first through swirling flow unit process;
2) after swirling flow unit process, the process of compact type air flotation cell is entered;
3) waste water after compact type air-flotation process enters organism Separation and Recovery unit;
4) after the process of separating organic matters recovery unit, waste water enters anaerobic biological cell processing again;
5) waste water after anaerobic biochemical treatment enters biological fluidized bed aerobic biochemical unit;
6) after biological fluidized bed cell processing, then advanced oxidation unit is entered;
7) waste water after advanced oxidation process enters after shifting sand filter unit carries out deep purifying process and reaches reuse requirement.
2. wood tar oil processing waste water closed processes method according to claim 1, is characterized in that: step 1) described in cyclonic separation unit refer to hydrocyclone.
3. wood tar oil processing waste water closed processes method according to claim 1, is characterized in that: through step 2) oil-contg after the process of compact type air flotation cell is less than 50mg/l.
4. wood tar oil processing waste water closed processes method according to claim 1, is characterized in that: step 3) described in separating organic matters recovery unit refer to hypergravity highly efficient distilling equipment, Separation and Recovery is carried out to the methyl alcohol in wood tar oil waste water.
5. wood tar oil processing waste water closed processes method according to claim 1, is characterized in that: step 4) described in anaerobic biological unit refer to the organic pollutant utilizing facultative anaerobe and obligatory anaerobic bacteria to come in degradation of sewage or mud.
6. wood tar oil processing waste water closed processes method according to claim 1, is characterized in that: step 5) described in biological fluidized bed aerobic biochemical unit refer to biological fluidized-bed reactor.
7. wood tar oil processing waste water closed processes method according to claim 1, is characterized in that: step 6) described in advanced oxidation unit refer to ozone, dioxide peroxide or hydrogen peroxide oxidation technique.
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