CN101113065A - Impact-resistant multiplication combined type coking waste water treatment process - Google Patents
Impact-resistant multiplication combined type coking waste water treatment process Download PDFInfo
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- CN101113065A CN101113065A CNA2007100427929A CN200710042792A CN101113065A CN 101113065 A CN101113065 A CN 101113065A CN A2007100427929 A CNA2007100427929 A CN A2007100427929A CN 200710042792 A CN200710042792 A CN 200710042792A CN 101113065 A CN101113065 A CN 101113065A
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Abstract
An anti-impact multiplying combination coking wastewater treatment technique relates to a treatment method of coking wastewater. The coking wastewater is first qualified by a physical-chemical pretreatment to improve biodegradable property of wastewater; the composite technology of a biological carrier of active sludge is adopted to do anaerobic/hypoxia/aerobic decarbonization/aerobic nitrification biochemical combination treatment; suspended or floating folding ball-shaped fillings are arranged in biochemical reactors and when micro organism traits are abnormal or a great amount of foams existing in the reactor, micro organism active incentive agents are added to the reactor in interval to improve active sludge traits and organism film quantity; finally the water is treated by a physical-chemical advanced treatment to reach a top grade standard. The invention not only strengthens the removal of COD, ammonia-nitrogen, volatile phenol and other pollutants in the coking wastewater by biochemical treatment but also resists serious water quality impact and has the advantages of quick system startup, less foams in an aeration tank, small occupying space, low operation cost and stable and effective treatment to coking wastewater.
Description
Technical field
A kind of shock proof multiplication combined type coking waste water treatment process relates to a kind of treatment process of coking chemical waste water.Belong to the technical field of waste water processing in the environment project.
Background technology
Coking chemical waste water mainly be in the raw coal high temperature carbonization process with the waste water that produces in coal gas is overflowed, condensation forms coking coal moisture and gas purification and the Chemicals treating process, be the trade effluent that typically contains poisonous hardly degraded organic substance.Organism kinds is various in the coking chemical waste water, toxic organic compound that contains such as benzene, pyridine, pyrocatechol, Phloroglucinol, bisnaphthol, naphthalene, chlorobenzene etc. suppress the respiration of microorganism in biological process, and these organism also can interfere with each other and suppress in biodegradation process.Coking chemical waste water contains higher ammonia nitrogen, and when ammonia nitrogen concentration in the reactor surpassed 100mg/L, nitration reaction was obviously suppressed, and along with the rising of ammonia nitrogen concentration, inhibition increases, and the ratio rate of rise of nitrifier reduces.In addition, the partial organic substances that contains in the coking chemical waste water is also inhibited to nitrifier, as aniline, phenol, ortho-cresol, meta-cresol, p-cresol and sodium cyanide nitrifier is produced 75% concentration that suppresses and is respectively 7.7,5.6,12.8,11.4,16.5 and 0.65mg/L.These characteristics of coking chemical waste water make it after biochemical treatment, and water outlet COD and ammonia nitrogen concentration still are difficult to reach the secondary standard that " Iron And Steel Industry pollution discharge standard " (BG13456-92) stipulated.
At present, the treatment process of coking chemical waste water can be divided into physico-chemical process and biochemical process substantially.Physico-chemical process has little electrolysis, coagulating sedimentation, coagulation air-float, absorption, wet type air oxidation technology etc.Coking chemical waste water belongs to high concentrated organic wastewater, adopts materialization processing cost height fully.In the practical application, the materialization treatment process is used for Wastewater Pretreatment with the influent quality that improves the biochemical treatment section be used for advanced treatment and make waste water reach emission standard more.Adopt biochemical processing method running cost relatively low, domestic most of coke-oven plant adopts biochemical processing process.Be the organic ammonia nitrogen of removing simultaneously in treatment of Coking Wastewater, generally adopt A/O (anoxic/aerobic) technology and establish the pretreated A of anaerobic hydrolysis
1-A
2-O (anaerobic-anoxic-aerobic) technology.Some coke-oven plant even employing add dilution water at equalizing tank and reduce toxicity, again by biochemical treatment.Although these biochemical process can effectively be removed waste water COD and ammonia nitrogen, but because characteristics such as coking chemical waste water has that difficult degradation toxic organic compound kind is many, content is high, ammonia nitrogen concentration is high and variation water quality is bigger, even the part coke-oven plant has adopted the way of thin up, microorganism active is subject to suppress, COD is difficult to up to standard and the ammonia nitrogen treatment effect is subject to the water quality impact, the problem that need can recover the long period after the impact but treat effluent still exists.
For overcome coking chemical waste water biochemical treatment COD, ammonia nitrogen is difficult to problem up to standard, the intensifying technology of biochemical treatment is introduced into the Treatment of Coking Effluent field.Chinese patent 87100332 discloses to biochemistry pool and has added 3～4mg/L glucose growth hormone and the method that accounts for the brown iron oxide of mud gross weight 10%, this method improves the treatment effect of biochemical system to COD, volatile phenol, prussiate and sulfide in order to enzyme system that perfects bacterium and the volume index (SVI) that reduces active sludge.Chinese patent 200510047159.X discloses to aerobic biochemistry pool and has added method by the bio-enhancer of bacterial classification and composition of nutritive substance, improves the treatment effect of biochemical system to volatile phenol.Chinese patent 200410005197.4 discloses to Sludge System and has added the method that microorganism species and absorbent charcoal carrier improve COD, ammonia nitrogen removal effect.Chinese patent 200510024373.3 discloses the method that adds zeolite powder strengthened denitrification effect to sequencing batch reactor (SBR).Chinese patent 200410043814.X discloses to Sludge System and has added the method that diatomite improves microorganism active.Chinese patent 200510012434.4 discloses biomembrance process anaerobic/anoxic/catalytic oxidation/biological aerated filter technology, the nitration reaction of ammonia nitrogen mainly occurs in the biological aerated filter in this technology, biophase is along the packed height layering, be beneficial to certain altitude formation nitrifier advantage section in packing layer, improve nitrification effect.The waste water treatment process of these new developments can both be in the biochemical treatment effect of particular aspects raising coking chemical waste water to a certain degree, but and fail to solve fully violent water quality that the Treatment of Coking Effluent facility exists and impact the back system and be difficult to recover or recovers slow, biochemical system long outstanding problem start time in actual motion, and do not relate to the problem that the aeration tank foam difficulty of Treatment of Coking Effluent existence disappears.
Summary of the invention
The purpose of this invention is to provide a kind of low cost, high-level efficiency, shock proof multiplication combined type coking waste water treatment process, this technology has not only been strengthened the removal of biochemical processing process to waste water COD, ammonia nitrogen, volatile phenol and other pollution substance, and be highly resistant to violent water quality impact, and has the advantage that system starts soon, the aeration tank foam is few.
For reaching above-mentioned purpose, the present invention need not add the tap water dilution in the coking chemical waste water equalizing tank, but directly adopt physico-chemical pretreatment, and oils, suspended substance and the toxic organic compound of coking chemical waste water, toxic inorganic thing are greatly reduced, strengthened biodegradable property of wastewater.Carry out biochemical combined treatment then, at last the primary standard that its arrival " Iron And Steel Industry pollution discharge standard " (BG13456-92) is stipulated with the materialization advanced treatment process.
The first step, physico-chemical pretreatment, elder generation's dosing coagulant in coking chemical waste water, dosage are looked the water quality situation and are changed and change, and are generally 50-200mg/L, adopt stepless change machinery to stir coagulating and air flotation technology, the raising biodegradable property of wastewater.Coagulating agent is one or more mixtures by the configuration of any mass ratio of polymerize aluminum chloride, aluminium iron polychloride, Tai-Ace S 150, bodied ferric sulfate, ferrous sulfate, iron(ic) chloride, potassium ferrate, Na2Fe04 etc.When taking place, water quality impacts, and too high as tar content, prussiate or sulfide or other waste water feature pollutant load, can be by adjusting the effect that the medicament kind that added and dosage guarantee physico-chemical pretreatment.Flocculation reaction can adopt waterpower to stir and two kinds of forms of mechanical stirring, and the mechanical stirring flocculation should be adopted the adjustable speed step-down gear.Behind the coagulant dosage, with the waste water thorough mixing, effects such as breakdown of emulsion, coagulation, absorption and salts reaction take place, make oils, suspended matter and newborn precipitation of salts thing obtain assembling, form the flock of suitable size, and in the flco generative process, adsorb part dissolved organic matter in the waste water.The abundant reacted solid-liquid separation of coagulating agent and waste water can adopt precipitation or air flotation technology.The waste water of band flco contacts with a large amount of micro-bubbles (bubble diameter 10～60 μ m) through the air supporting zone of action in the dissolved air flotation, act on the disengaging zone by bubble adhesion, copolymerization etc. and form scum silica frost, floatingly flow into oil-water separation tank to the slick slag and carry out oily water separation.The oils of the coking chemical waste water after solid-liquid separation, suspended substance and toxic organic compound, toxic inorganic thing greatly reduce, and have improved biodegradable property of wastewater.Coking chemical waste water through physico-chemical pretreatment adopts anaerobic/anoxic/aerobic decarburization/aerobic nitrification complex reaction (A
1-A
2-O
1-O
2) technology carries out biochemical combined treatment, is called for short anaerobic/anoxic/decarburization/nitrated complex reaction.
In second step, the coking chemical waste water through physico-chemical pretreatment is carried out anaerobic/anoxic/decarburization/nitrated complex reaction biochemical treatment with bio-carrier-active sludge compounding technology.
A. anaerobic hydrolysis complex reaction.Hang the polyethylene Ball-type packing in the anaerobic hydrolysis compound reactor, the filler monomer adopts cellular channels designs, it is folding and expanding formula suspension microorganism carrier filler (seeing Chinese invention patent 01112857.7), the model of this filler is ZYZX, is produced by Shanghai Zhongyao Environmental Protection Industrial Co., Ltd. and Shen, Shanghai credit environmental protection Industrial Co., Ltd..This filler has that specific surface area is big, transportation volume is little, easy for installation, lower-price characteristic.Waste water makes a large amount of anerobe microbial films energy and the waste water thorough mixing that adhere on the filler by cellular passage free penetrating filler, and biofilm microorganisms concentration is greater than 3.5g/L.Simultaneously behind the anaerobic hydrolysis compound reactor, establish settling tank, make up the anaerobic sludge return-flow system, suspension active sludge and carrier biofilm are coexisted as in the anaerobism composite bioreactor.Because the anaerobic hydrolysis water outlet does not ask for a clarification, the settling tank here only need dam active sludge to keep the activated sludge concentration in the anaerobic fixed film reactor, and pond body design hydraulic load is higher, and floor space is little.Biofilm biomass on the hanging filler and the microorganism concn in the water body
Become positive correlation, because the existence of suspension active sludge makes that biofilm biomass is than the biofilm biomass height of common anaerobic fixed film reactor hanging filler on the filler.The hydraulic detention time of anaerobic hydrolysis compound reactor is 4～30 hours.Active sludge microorganism concentration is greater than 2.0g/L, and total microorganism concn is greater than 5.5g/L.Settling tank adopts vertical sedimentation tank, and hydraulic load is 1.2m
3/ m
2H.Because at filling surface, there is not caking phenomenon in biofilm development.In reactor, under the lytic enzyme catalysis ring-type or the organic larger molecular organics of heterocycle are converted into simple organism outside the bacteriogenic born of the same parents, for follow-up anoxic, aerobe are handled the organic substrate that preparation is easily utilized by microorganism.Enter anoxic, decarburization and digestion compound reactor more successively, in the hope of removing organism and the ammonia nitrogen in the waste water.
Decarburization, denitrogenation are undertaken by anoxic, decarburization and nitrated three kinds of compound reactors and second pond.The Ball-type packing that wherein hang the folding and expanding formula in the anoxic compound reactor, contains a large amount of cellular passages is as bio-carrier, and decarburization and nitrated two kinds of compound reactors adopt suspended biological carrier.
B. hang polyethylene ball-type filler in the anoxic compound reactor, the employing mechanical stirring is mixed, microbial film and the coexistence of suspension active sludge, biofilm microorganisms concentration is greater than 3.0g/L, active sludge microorganism concentration is greater than 3.0g/L, total microorganism concn enters follow-up decarburization complex reaction and nitrated complex reaction greater than 6.0g/L behind stop 10～18h; When unusual or bubble-related issues were serious when microorganism proterties in the reactor, intermittently to wherein adding microorganism active excitation agent, dosage was 10～20mg/L, improved the active sludge proterties, improved biofilm biomass, bubble-related issues are effectively controlled.
C. the decarburization complex reaction adds suspension polyethylene Ball-type packing in the decarburization compound reactor, adopts big flux aeration, makes pneumatic blending intensity reach 2.8m
3Air/hm
3More than the water, the ball-type filler of suspension fast rotational under the stirring action of current, air-flow makes waste water fully contact hydraulic detention time 24～36h with microorganism on the filler;
D. nitrated complex reaction, same earlier at nitrated compound reactor inner suspension polyethylene Ball-type packing, add the required additional basicity of nitration reaction at this reactor inlet place simultaneously, make pH=7-8; Nitrated compound reactor hydraulic detention time is 12～24h, and biofilm microorganisms concentration is greater than 3.0g/L, and active sludge microorganism concentration is greater than 3.0g/L, and total microorganism concn is greater than 6.0g/L.The mixed solution part that nitrated compound reactor comes out is back to the anoxic compound reactor, and return current ratio of the mixed liquid is controlled at 2～5 times.Another part mixed solution goes follow-up materialization advanced treatment after clarifying through second pond; The spissated activity sludge reflux of second pond is to the anoxic compound reactor, and control of reflux ratio is at 0.5～2 times.
The 3rd step, the materialization advanced treatment, waste water supernatant liquor after second pond is realized mud-water separation enters materialization advanced treatment device, adopts coagulating and air flotation technology.Adopt coagulating, air supporting solid-liquid separation technique can further remove gluey organism and tiny activated sludge particles, water outlet COD is further reduced.The injected volume of coagulating agent is 0～100mg/L, makes effluent quality reach " Iron And Steel Industry pollution discharge standard " (BG13456-92) primary standard.
Microorganism active excitation agent of the present invention is the complex body of independent organism, independent inorganics or organism and inorganics.Organism can adopt glucose, pyruvic acid, and its mechanism of action is to provide material conditions for perfecting enzyme system.Inorganics is divalence or trivalent metal ion compound monomer or polymer, its mechanism of action is that divalence or trivalent metal ion can provide prothetic group or activator for biological enzyme, improve the activity of microbial enzyme, divalence or trivalent metal ion compound monomer or polymer possess the biofloculation function simultaneously, can effectively improve the active sludge flocculence, help the adhesion of microorganism on bio-carrier, solve because the problem that activated sludge bulking that coking chemical waste water water quality is very unstable, water quality is impacted or the short-term heavy-duty service may cause and bio-carrier microorganism active reduce.In order under abnormal conditions, to guarantee the high reactivity of active sludge biological flocculence and microorganism, add microorganism active excitation agent at the anoxic compound reactor.Adopt two kinds of mechanisms of action of microorganism excitation agent of organism mineral complex to bring into play simultaneously, effectively improve microorganism active, wherein organism and inorganics press mass ratio and were prepared in 1: 3～1: 1.
The active sludge coherency improves makes its volume index reduce, and can improve second pond underflow sludge concentration, and then improve the activated sludge concentration of system, and the raising of activated sludge concentration helps the raising of microorganism concn on the bio-carrier.
Divide organism degraded and two functional zone of the nitrated transition of decarburization fast in the decarburization compound reactor of the present invention, and microbial film and the coexistence of suspension active sludge.Pollutents such as waste water COD, volatile phenol, prussiate, sulfide are degraded fast in first functional zone (organism degrade fast district), remove nitrobacteria growth the inhibition factor; In second functional zone (the nitrated zone of transition of decarburization), organism further reduces, and adapt circumstance makes nitrifier obtain breeding simultaneously.Nitrifier utilizes that original basicity is oxidized to nitric nitrogen with ammonia nitrogen in the coking water in this district, makes pH and basicity greatly reduce.Add the required additional basicity of nitration reaction in nitrated compound reactor ingress.The alkali that adds in the nitrated compound reactor is consumed rapidly because of nitrification.Because surfactant concentration height, pH are higher, may have bubble-related issues in decarburization compound reactor first functional zone, therefore establish the froth breaking shower nozzle in the quick degradation function of organism district, froth breaking water is taken from system's water outlet storage pool.Waste water pollutents such as COD, volatile phenol, prussiate, sulfide in first functional zone are degraded fast; In second functional zone, organism further reduces, and nitrifier is oxidized to nitric nitrogen with ammonia nitrogen under aerobic condition subsequently, produces hydrogen ion simultaneously, makes wastewater pH and basicity greatly reduce.
Beneficial effect of the present invention:
1, the present invention can remove oily substance in the coking chemical waste water significantly by physico-chemical pretreatment, remove suspended substance, colloid simultaneously and be partly dissolved organic matter, can effectively reduce the organic and inorganic toxicant in the waste water, optimizing the material of waste water forms, improve biodegradable property of wastewater, help follow-up biochemical treatment, and have the very strong anti-water yield and water quality impact capacity.
2, because filler monomer of the present invention contains a large amount of cellular passages, and waste water is when penetrating these passages, the desorption of current shearing makes that the microbial film on the filler is upgraded in time.There is the miniature environment of dissolved oxygen gradient and organism gradient in thicker microbial film on the Ball-type packing, to inwardly, can be divided into aerobic zone and oxygen-starved area along the costal fold Nogata.Promptly on this direction, the dissolved oxygen distribution that tapers off forms the denitrification zone of infinitesimal.At the microbial film skin, issue the caliche reaction at aerobic condition, after the nitric nitrogen of generation enters the internal layer oxygen-starved area, under denitrification, produce nitrogen.The advantage that adopts synchronous nitration and denitrification technology is to reduce the supply of oxygen, reduces power consumption, reduces the size in denitrification pond, reduces the floor space of treatment facility.
3, by the anaerobic hydrolysis reaction ring-type or heterocyclic macromole hardly degraded organic substance are converted into simple readily biodegradable organism, handle for follow-up anoxic, aerobe and prepare to provide the high quality organic substrate.Bio-carrier microorganism and active sludge synergy in the hybrid anaerobic reactor, microbial total concentration height, microorganism are abundant mutually, thereby have stronger impact resistance, become the water quality buffering barrier of follow-up biological decarburization denitrification process system.In the hybrid anaerobic reactor initial start stage, the activated sludge concentration of inoculation is maintained by the mud return-flow system, and this makes that the anaerobe film apposition growth on the bio-carrier is rapid, has overcome coking chemical waste water anaerobic reactor long difficult problem start time.
4, in the anoxic compound reactor, as the carbon source betatopic, and the nitrate nitrogen that refluxes from nitrification liquid gets electronics, is reduced to nitrogen, removes the part BOD in the waste water simultaneously from the organism of hybrid anaerobic reactor.The coexistence of active sludge and biologic packing material makes the biomass of growing on the filler increase in the reactor, and enriched biophase in the reactor, increased microorganism concn, thereby biological overall resistance to poison and anti-water quality impact capacity have been improved, can effectively reduce volumetric loading, reduce the floor space of reactor.
5, the decarburization compound reactor function division design of adopting, the aeration tank bubble-related issues can be effectively controlled in reactor basicity pH control and local froth breaking measure, have solved the difficult problem that coking chemical waste water tradition biochemical treatment system bubble-related issues are serious, active sludge easily runs off.The major function of decarburization compound reactor is to fall except that pollutents such as waste water COD, volatile phenol, prussiate, sulfide, remove the inhibition of prussiate and organism such as aniline, phenol, ortho-cresol, meta-cresol, p-cresol, for the growth and breeding of follow-up nitrated section nitrifier creates favorable conditions to nitrifier.
6, nitrated compound reactor is interior is dominant microflora with the nitrifier, replenishes basicity to keep basicity and pH in the reactor in nitrated compound reactor.Nitrifier is the crucial bacterial classification of biological denitrificaion, and this type of bacterium is long, poor to adaptive capacity to environment generation time, and is subject to the hazardous and noxious substances inhibition.Because a large amount of nitrobacteria growths are on the big cellular Ball-type packing of folding and expanding formula of specific surface area, possess enough mud first and guarantee that nitrifier multiplies age, second avoided with activity sludge reflux to biochemical front end, exempted the murder by poisoning of toxicant and anoxic process its activity is suppressed.
7, the microorganism active excitation agent of adopting can play a significant role when the biochemical treatment system abnormal conditions, make microflora recover treatment effect rapidly, avoided coking chemical waste water tradition biochemical treatment system after abnormal problems such as water quality impact, sludge bulking, foam sharp increase take place, to need a long-time difficult problem of recovering.
8, the multiplication Physiochemical and biochemical combined treatment process of the present invention's design has powerful anti-water quality impact capacity, when the coking chemical waste water water quality deterioration, still effectively the degrading waste water pollution substance makes water outlet reach the predefined process target, avoids traditional biochemical treatment system to need the risk of domestication again after impacted by violent water quality.
9, biochemical system adopts composite bioreactor, make can obtain higher volumetric loading, thereby floor space to be few by whole microorganism concn height, and have running cost low, to the stabilizing effective advantage of the processing of coking chemical waste water.
Description of drawings
Fig. 1 is a coking chemical waste water Physiochemical and biochemical combined treatment process flow process disclosed in this invention.
Embodiment
See also Fig. 1, technology of the present invention does not add any dilution water.Certain coke-oven plant's coking chemical waste water water yield is 1500m
3/ d.Its wastewater source is: a, distilled ammonia wastewater, water yield 30m
3/ h; The draining in b, tar workshop, the water yield 10～60m
3/ h; The draining in c, refining benzene workshop, water yield 10m
3/ h; Draining e, the underground phenol water of d, cleaning tank car.The physico-chemical pretreatment technology adopts stepless change machinery to stir coagulating, pressure air-dissolving air-float technology, and the microbubble diameter that the pressure air-dissolving release system produces is about 20 μ m, coagulant dosage concentration 50～200mg/L.Hybrid anaerobic reactor hangs polyethylene ball-type filler, adopts mechanical stirring to mix, and hydraulic detention time is 8h, and biofilm microorganisms concentration is greater than 3.5g/L, and active sludge microorganism concentration is greater than 2.0g/L, and total microorganism concn is greater than 5.5g/L.Settling tank is a vertical sedimentation tank, and hydraulic load is 1.2m
3/ m
2H, pond body square, the length of side is 7m, establishes two groups.The anoxic compound reactor hangs polyethylene ball-type filler, adopts mechanical stirring to mix, and the residence time is 18h, and biofilm microorganisms concentration is greater than 3.0g/L, and active sludge microorganism concentration is greater than 3.0g/L, and total microorganism concn is greater than 6.0g/L.Decarburization compound reactor and nitrated compound reactor inner suspension polyethylene Ball-type packing, coking chemical waste water needs big flux aeration, makes pneumatic blending intensity reach 2.8m
3Air/hm
3Water, the ball-type filler is fast rotational under current, air-flow stirring action, and waste water is fully contacted with microorganism on the filler.Decarburization compound reactor hydraulic detention time 24h, wherein " organism degrade fast district " residence time is 8 hours, " decarburization, the nitrated zone of transition " residence time is 16 hours, nitrated compound reactor hydraulic detention time is 12h, biofilm microorganisms concentration is greater than 3.0g/L, active sludge microorganism concentration is greater than 3.0g/L, and total microorganism concn is greater than 6.0g/L.Back materialization is handled and is adopted coagulating, pressure air-dissolving air-float as the water quality safeguards technique.Coagulant charging quantity is 10～100mg/L, also can not add medicament according to actual effluent quality.Decarburization compound reactor organism degrade fast the district establish 6 groups of froth breaking shower nozzles, froth breaking water is taken from system's water outlet storage pool, the froth breaking water yield is 6m
3/ h, pump head is 30m.Microorganism active excitation agent dosage is 10～20mg/L, and the time of adding is 12h every day, adds continuously 3 days.The treatment effect of this treatment facility and wastewater discharge standard see Table 1 and table 2 respectively.Table 3 has provided the unit running cost and the processing cost of this treatment facility.
The overall process effect of table 1 technology of the present invention and ammonia nitrogen impact the treatment effect in period
| Project (mg/L) | Ammonia nitrogen concentration normal epoch Inlet and outlet water Pollutant levels average | Ammonia nitrogen concentration impact epoch Inlet and outlet water Pollutant levels average | ||||
| Water inlet | Water outlet | Clearance | Water inlet | Water outlet | Clearance | |
| COD | 1868 | 83 | 95.56 | 2031.8 | 91.2 | 95.51 |
| Ammonia nitrogen | 123 | 8.2 | 93.33 | 386.4 | 11.6 | 97.09 |
| Volatile phenol | 534.2 | 0.12 | 99.98 | 574.0 | 0.15 | 99.97 |
| Prussiate | 17.6 | 0.13 | 99.26 | 13.8 | 0.19 | 98.62 |
| Sulfide | 19.3 | 0 | - | 21.2 | 0 | - |
| Oils | 123.4 | 1.27 | 98.97 | 112.7 | 2.56 | 97.73 |
| pH | 7.5～9.5 | 7.0～7.5 | - | 7.5～9.0 | 7.0～7.5 | - |
Table 2 " Iron And Steel Industry pollution discharge standard " is primary standard (BG13456-92)
| Volatile phenol mg/L | Prussiate mg/L | CODmg/L | Ammonia nitrogen mg/L | Oils mg/L | The pH value |
| 0.5 | 0.5 | 100 | 15 | 5 | 6～9 |
Table 3 waste water unit running cost and processed in units cost
| Sequence number | Project | Numerical value (unit/m 3) |
| 1 | Expenditure on power | 1.35 |
| 2 | Medicament expense | 1.07 |
| 3 | Winter, steam took | 0.14 |
| 4 | Labour cost | 0.13 |
| 5 | General depreciation cost | 1.07 |
| 6 | Maintenance cost | 0.23 |
| 7 | Unit running cost (=1+2+3+4) | 2.68 |
| 8 | The processed in units cost (=1+2+3+4+5+6) | 3.99 |
Claims (3)
1. shock proof multiplication combined type coking waste water treatment process is characterized in that:
The first step, physico-chemical pretreatment: elder generation's dosing coagulant in coking chemical waste water, dosage is 50-200mg/L, by coagulating and air flotation technology, improves biodegradable property of wastewater;
In second step, the coking chemical waste water through physico-chemical pretreatment is carried out anaerobic/anoxic/decarburization/nitrated complex reaction biochemical treatment with bio-carrier-active sludge compounding technology:
A. bunchiness hangs polyethylene ball-type filler is installed in the hybrid anaerobic reactor, this filler is the cellular passage Ball-type packing of folding and expanding formula, simultaneously the active sludge that dams is set behind anaerobic reactor to keep the settling tank of activated sludge concentration in the anaerobic reactor, active sludge and carrier biofilm are coexisted as in the anaerobic reactor, and with activity sludge reflux that settling tank is held back to anaerobic reactor; The anaerobism composite bioreactor adopts mechanical stirring to mix, the microorganism concn of apposition growth is greater than 3.5g/L on the control filler, suspension active sludge microorganism concentration is greater than 2.0g/L in the anaerobic reactor, and total microorganism concn is greater than 5.5g/L, hydraulic retention 4～30 hours; The settling tank hydraulic load is less than 1.5m
3/ m
2H;
B. anoxic complex reaction, the water outlet in A step is introduced into the anoxic compound reactor, to remove organism and the ammonia nitrogen in the waste water, bunchiness hangs polyethylene ball-type filler is installed in the anoxic compound reactor, the employing mechanical stirring is mixed, microbial film and the coexistence of suspension active sludge, the microorganism concn of apposition growth is greater than 3.0g/L on the microbial film, suspension active sludge microorganism concentration is greater than 3.0g/L in the anoxic reacter, total microorganism concn enters decarburization compound reactor and nitrated compound reactor greater than 6.0g/L behind stop 10～18h successively; When unusual or bubble-related issues were serious when microorganism proterties in the reactor, intermittently to wherein adding microorganism active excitation agent, dosage was 10～20mg/L, improves the active sludge proterties, improves biofilm biomass;
C. the decarburization complex reaction earlier at decarburization complex reaction inner suspension polyethylene Ball-type packing, makes up mixed solution and mud return-flow system by second pond simultaneously, adopts big flux aeration, makes pneumatic blending intensity reach 2.8m
3/ hm
3More than the water, the ball-type filler of suspension fast rotational under the current stirring action makes waste water fully contact hydraulic detention time 24～36h with microorganism on the filler;
D. nitrated complex reaction adds the required basicity of nitration reaction equally at nitrated compound reactor inner suspension polyethylene Ball-type packing, and in nitrated compound reactor ingress, makes pH=7-8; Nitrated compound reactor hydraulic detention time is 12～24h, the microorganism concn of apposition growth is greater than 3.0g/L on the microbial film, suspension active sludge microorganism concentration is greater than 3.0g/L in the reactor, total microorganism concn is greater than 6.0g/L, the mixed solution part that nitrated compound reactor comes out is back to the anoxic compound reactor, return current ratio of the mixed liquid is controlled at 2～5 times, and a part is gone the materialization advanced treatment after clarifying through second pond; The spissated activity sludge reflux of second pond is to the anoxic compound reactor, and control of reflux ratio is at 0.5～2 times;
In the 3rd step, the materialization advanced treatment adopts coagulating and air-float technology, and the injected volume of coagulating agent is 0～100mg/L, and effluent quality reaches " Iron And Steel Industry pollution discharge standard " (BG13456-92) primary standard, conventional discharging.
2. a kind of shock proof multiplication combined type coking waste water treatment process according to claim 1 is characterized in that; Described coagulating agent is that in polymerize aluminum chloride, aluminium iron polychloride, Tai-Ace S 150, bodied ferric sulfate, ferrous sulfate, iron(ic) chloride, potassium ferrate, the Na2Fe04 one or more form than mixed configuration by any quality.
3. a kind of shock proof multiplication combined type coking waste water treatment process according to claim 1 is characterized in that; Described microorganism active excitation agent is independent organism, inorganics or be organism by mass ratio separately: inorganics=1: the 3～organism that 1 mixed configuration forms and the complex body of inorganics, wherein organism is glucose or pyruvic acid, and inorganics is divalent-metal ion compound monomer or polymer.
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| CNB2007100427929A Expired - Fee Related CN100503485C (en) | 2007-06-27 | 2007-06-27 | Impact-resistant multiplication combined type coking waste water treatment process |
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