CN101607777B - Lurgi furnace coal gasification wastewater treatment and reuse technology - Google Patents
Lurgi furnace coal gasification wastewater treatment and reuse technology Download PDFInfo
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Abstract
The invention discloses a Lurgi furnace coal gasification wastewater treatment and reuse technology, comprising the steps of adopting aeration adjustment, oil separation and sedimentation, hydrolysis acidification, denitrification treatment, first order carrier fluidized bed decarburization, residual COD removement with activated sludge, second order carrier fluidized bed ammonia/nitrogen removement, sludge-water separation, precipitation, oxidation reaction, residual ozone removement, organic waste removement and floating filter treatment to treat the coal gasification wastewater of a Lurgi furnace coal gasification factory and obtaining water which can be reused. The invention has simple operation and low process cost and the treated effluent can be used as the cooling water of boiler furnaces, thus fully recycling the treated Lurgi furnace coal gasification wastewater.
Description
Technical field
The present invention relates to a kind of sewage disposal technology, relate to a kind of Lurgi furnace coal gasification wastewater treatment and reuse technology specifically, belong to technical field of sewage.
Background technology
The direct burning of coal only can be brought into play its usefulness of 30%, and remaining nearly 70% energy has all been wasted in vain, and in order to make full use of the energy, the exploitation of coal transformation technology is all attached great importance in countries in the world.Lurgi furnace coal gasification is a coal utilization mode efficiently, and the sewage of Lurgi furnace coal gasification also results from the coal conversion process, general Lurgi furnace coal gasification sewage source dual mode: the one, have neither part nor lot in the steam water of gasification in gasification section as the steam of vaporized chemical; The 2nd, the waste water that produces when raw gas is cooled off washing.The gas sewage water yield is big, and water quality is very complicated, contains a large amount of phenol, ammonia, CO
2, pollutent such as lipid acid, tar, ketone and amine.Treatment scheme and technology is difficult to realize up to standard at present.
For as much as possible that the Lurgi furnace coal gasification sewage disposal is good, in the prior art, the mode that generally adopts chemical separating to combine with biochemical treatment is handled such sewage both at home and abroad, and chemical separating comprises unit processes such as stripping, extraction, rectifying, to remove sour gas, reclaim phenol, ammonia etc., but owing to have defective in pollution load height, water quality complexity and the treatment scheme design, make the general poor effect of operation conditions of chemical separation process; And aerobic treatment and anaerobism, aerobic treatment, active sludge or biomembrance process and combination process are adopted in biochemical treatment more, biochemical treatment operational administrative requirement condition height, different system can biochemical ability differ greatly, make its popularization be subjected to certain limitation, therefore, present treatment scheme and technology are difficult to realize qualified discharge.
Summary of the invention
The objective of the invention is in order to overcome the deficiencies in the prior art, and a kind of Lurgi furnace coal gasification wastewater treatment and reuse technology safe and reliable to operation is provided.
A kind of Lurgi furnace coal gasification wastewater treatment and reuse technology of the present invention is achieved through the following technical solutions:
A kind of Lurgi furnace coal gasification wastewater treatment and reuse technology of the present invention comprises the steps:
Step 1: the sewage that will come from Lurgi furnace coal gasification adopts the perforated pipe blast aeration to stir in the aerating regulation jar, makes sewage even, stable; Because general Lurgi furnace coal gasification sewage comes the water pollutant fluctuation of concentration bigger, operation to biochemical system is unfavorable, therefore by aerating regulation can be evenly, stablize the water quality of coming water, aerating regulation adopts perforated pipe blast aeration stirring, the airtight recovery of the foam of generation.
Step 2: will come from the aerating regulation jar and in the oil removal setting tank, settling of floccus be arrived a jar end by density difference through even, stable sewage, make to float to the tank deck liquid level on the lightweight oil organic matter, thereby organism, toxic substance that the part in the sewage is difficult to biochemical degradation are separated.
Step 3: will come from oil removal setting tank sewage after treatment and in hydrolization and acidification tank, solid matter is dissolved as that dissolved matter, macromolecular substance are degraded to small-molecule substance, carbohydrate degradation is that lipid acid, organic acid and dissolved nitrogenous compound are decomposed into ammonia, amine, carbonate and a spot of CO
2, H
2
The acidication technology is a kind of advantages of simplicity and high efficiency treatment process, and it can be for follow-up aerobic treatment provides very favorable condition, particularly widespread use in the difficult degradation sewage disposal.
Pollutants in sewage is by disperseing to be divided into suspension, super colloid, colloid and 4 kinds of different shapes of solvability.Divide the chemical oxygen demand COD that is defined as solvability, colloid, super colloid and can sinks (Chemical Oxygen Demand is abbreviated as COD) according to the simple separation method that adopts on the engineering.The organic pollutant of these 4 kinds of different physical conditions migration path for transformation for a large amount of microorganisms in the hydrolysis acidification pool at first will intake in particulate matter and colloidalmaterial hold back rapidly and adsorb, this is the rapid reaction of a physical process, general as long as can finish in several seconds to tens seconds, therefore reaction is rapidly.The material that is retained down is adsorbed on the surface of hydrolyzing sludge, the metabolism that is decomposed at leisure, and it is greater than hydraulic detention time at intrasystem sludge retention time.Under the effect of a large amount of hydrolytic bacterias with macromole, be difficult to degradable chemical be converted into be easy to biodegradable small-molecule substance after, be discharged into again in the liquid, under higher hydraulic load, shift out system with current.Since hydrolysis and acid-producing bacteria from generation to generation the phase shorter, often in divide and hour, therefore, this degradation process also is rapidly.Solvability biochemical oxygen demand (BOD) BOD (biochemical oxygen demand in this course, be abbreviated as BOD) though, say to have only about 10% on the clearance surface of COD, but because particulate organic matter generation hydrolysis has increased the concentration of dissolved organic matter in the system, therefore, solvability BOD, COD clearance are far longer than 10%.As can be seen, hydrolysis acidification pool integrates precipitation, absorption, net is caught and biological degradation functions such as physical and chemical processes such as biofloculation and hydrolysis, acidization.
Hydrolization and acidification tank adopts upflow anaerobic sludge blanket process UASB (Up-flow Anaerobic Sludge Bed is abbreviated as UASB) design form, and internal reflux is kept the Sludge Bed height.
Step 4: the sewage after will handling through step 3 is introduced the denitrification pond, for denitrification process provides competent carbon source; Utilizing denitrifying bacteria that the nitrification liquid that refluxes is handled, is gaseous nitrogen with nitrate-nitrogen reduction;
Biological denitrificaion is finished by two processes of nitrification and denitrification, sewage carries out earlier nitrated in Aerobic Pond, make itrogenous organic substance by the bacterial degradation ammonification, ammonia further changes into nitric nitrogen, and a part that contains the nitrification liquid of nitric nitrogen then is back to denitrification, and denitrification reactor in denitrifying bacteria with the organism in the raw waste water as carbon source, with the oxygen of nitrate in the phegma as being subjected to electric body, breathing and vital movement, is gaseous nitrogen with nitrate-nitrogen reduction, does not need additional carbon.
It is the anoxic activated sludge process that Prepositive denitrification technology is used comparatively sophisticated in the coal gasification wastewater field, can well adapt to ammonia nitrogen concentration height in the coal gasification wastewater, hardly degraded organic substance water quality characteristics how.
At the portion C OD (be generally nitric nitrogen 3.5 times) that can degrade synchronously of denitrifying while, realize no aeration degraded COD, save the energy.
Step 5: will in level vector fluidized-bed (CBR1) reaction tank, carry out aerobic reaction through the sewage that denitrification is handled, and carry out organic degraded and nitration reaction takes place;
Activated sludge process has obtained very big development since earlier 1900s is applied to sewage disposal, mainly be that treatment effect is relatively good under the stable situation of system because its system is simple relatively.But for a long time, a little less than the active sludge impact resistance, temperature sensitive (particularly low temperature), mud easily expand and the sludge loss problem is the problem that many sewage works often face, during particularly for high ammonia nitrogen, high-concentration hardly-degradable sewage, there is very big defective in activated sludge process.
Biomembrance process will significantly be better than activated sludge process above aspect several, and enriches aspect the degree at microorganism concn and flora, and biomembrance process has significant advantage.
Carrier fluidized bed CBR (Carrier Biofilm Reactor is abbreviated as CBR) is a kind of bio membrane treatment efficiently.Carrier fluidized bed technology is used the ultimate principle of biomembrance process, has made full use of the advantage of activated sludge process, has overcome the shortcoming of traditional activated sludge process and fixed type biological embrane method again.Key problem in technology is to have researched and developed proportion and approaches water, is easy under the gentle agitation with the free-moving biologic packing material of water.It is big that biologic packing material has effective surface area, is fit to the characteristics of microorganism absorption growth.The structure of filler is a feature to have shielded internal surface area for microorganism growth.When aeration aerating, the rising buoyancy of air filled cavity promotes filler and water body on every side flows, and is blocked by filler again when air-flow passes the space of current and filler, and is divided into small bubbles.In such process, filler is stirred fully and is mixed with current, and airflow is divided into tiny bubble fully, has increased contacting and oxygen transfer efficiency of microbial film and oxygen.
Under the aeration agitation condition, current and filler fully flow, and reach microbial film and fully contact and biolytic purpose with processed pollutent.Therefore, carrier fluidized bed technology has broken through traditional biological embrane method (obstruction of static bed biomembrane technology and water distribution inequality, and the fluidisation of carrier fluidized bed technology limitation) restriction has been established basis preferably for biomembrance process is applied even more extensively in the biological treatment of sewage.
In the CBR reactor, attached growth of microorganisms is in the suspending carrier surface, the biological concentration height, and flora is abundant, has very long sludge age (20～40 days), and it is rich long-pending that the apposition growth mode also is beneficial to other special flora, removes the pollutent of difficult degradation.Carrier fluidized bed (CBR) reactor promotes the processing power and the treatment effect of reaction tank, and the enhanced system impact resistance.Most of organism in the sewage will be degraded in level vector fluidized-bed (CBR1) and remove.
Step 6: the sewage after will carrying out aerobic reaction in level vector fluidized-bed (CBR1) reaction tank is further removed chemical oxygen demand COD in activated sludge tank.
Contradiction between abundant Balance Treatment load of this process section and the construction investment significantly reduces the suspended biological filler dosage.After decarburization carrier fluidized bed (CBR) technology, the decarburization activated sludge process is set, leading portion carrier fluidized bed (CBR) pond in short residence time(SRT) very, remove most of chemical oxygen demand (COD) (COD) under the high-load condition, residue chemical oxygen demand (COD) (COD) is removed in activated sludge tank.
Step 7: in secondary carrier fluidized bed (CBR2), carried out the processing of oxygen ammonia nitrogen removal carrier current, the nitrification liquid part of fully reacting of the carrier fluidized bed nitrator of secondary is back to carries out denitrification in the denitrification pond and handle, another part flow into the second pond of next stage;
Because the ammonia nitrogen removal Nitrobacter is in the autotrophic type microorganism, growth and breeding is slow, so system needs long mud age.Carrier fluidized bed CBR utilizes biologic packing material to come enrichment and growth nitrifier slowly, and the microbial film sludge age on the carrier is long, is suitable for very much the growth of nitrifier, nitrifier concentration height, and therefore nitrated denitrogenation ability is remarkable, and 25 ℃ nitrification efficiency reaches 720～1,000gNH
4 +-N/m
3D, and traditional activated sludge process is under the situation of 3g/l in sludge concentration, nitrification efficiency is lower than 100～200gNH
4 +-N/m
3D.
Step 8: bio-chemical effluent is carried out mud-water separation at second pond, simultaneously the part mud in the second pond is back in the front end denitrification pond, guaranteeing has enough biomasss in denitrification pond and the nitrification tank.
Step 9: will in coagulative precipitation tank, precipitate through the second pond oettIed sewage;
Fast confounding and flocculation zone are set, can better the uniform mixing medicament, help to form flco, reduce dosing.The sewage of settling tank after to coagulation is set carries out mud-water separation.
Step 10: will in coagulative precipitation tank, carry out sedimentary sewage and in the ozone catalytic reaction tower, react by ozone with the ozonizer generation.
After leading portion materialization and biochemical treatment, still contain a certain amount of Persistent organic pollutants in the water, this part pollutent generally is macromole heterocyclic compound, the stable organism of small molecule structure, be difficult to transform and remove in acidication section and aerobic biochemical Duan Jun, need make its open loop open chain by the effect of chemical oxidizing agent, be transformed into micromolecular compound or be converted into structural unstable small organic molecule, thereby be converted into the utilizable BOD of microorganism, thoroughly degrade and eliminate the colourity material.
Colourity and hardly degraded organic substance that ozonation technology is used in recent years as a kind of high-level oxidation technology.Its reaction principle mainly is by active free radical (OH) and pollutant reaction, make the unsaturated link(age) fracture in the chromophoric group, generate intermediate products such as little, the colourless organic acid of molecular weight, aldehyde, these intermediate products are difficult to thoroughly be removed by ozone, but can further be degraded by microorganism.
The filler of the built-in carried catalyst of reaction tower, the perforated pipe water distribution for pollutent in ozone, the sewage fully contacts the condition that provides with catalyzer, owing to exist suspended substance can stick to filling surface in the sewage, needs regular back flushing, and wash once general 2～March.
Step 11: will be in the oxidizing reaction tower sewage behind catalytic ozonation, utilize the perforated pipe blast aeration stripping residue ozone of the empty degassing tower that exposes to the sun.Sewage generally can remaining a small amount of unreacted ozone behind catalytic ozonation, for avoiding influencing follow-up biochemical system microorganism active, need remove residue ozone.Degassing tower is set, utilizes perforated pipe blast aeration stripping residue ozone.
Step 12: sewage is through after the catalytic ozonation, and colourity and chemical oxygen demand (COD) (COD) descend, biochemical oxygen demand (BOD) (BOD) rises, and Biodegradability of Wastewater increases, and three rearmounted grade carrier fluidized-beds (CBR3) of utilization remove the residue organic pollutant in anhydrating.
If exist a large amount of biochemical oxygen demand (BOD)s (BOD) and ammonia nitrogen will cause microbial reproduction in the equipment in the recirculated cooling water, cause biological fouling, harm such as metallic corrosion.Carrier fluidized bed technology (CBR) is equally applicable to the advanced treatment of low-concentration organic wastewater, attached growth of microorganisms is in the floating stuffing surface, the biological concentration height, the apposition growth mode is beneficial to the natural selection of other special flora simultaneously, thereby obtains lower water outlet chemical oxygen demand (COD) (COD) concentration.Technology is simple, does not have back-purge system, water distribution system, receipts water system, need not the filler regeneration system rapidly, automatic control system, and the operation convenient management.The back need not to be provided with settling tank, reduces floor space.
Step 13: the sewage after will handling through three grade carrier fluidized-beds (CBR3) carry out mixing soon in Airfloat filtering pond, flocculation, air supporting and filtration;
Airfloat filtering pond of the present invention be with coagulation process fast mix, flocculation, air supporting and filtering technique be integrated into a cover integral device, sewage enter fast mix the pond after, add the flocculation medicament, stir fast, soup and Yuan Shui are mixed.And then enter flocculation basin, and stir at a slow speed, form and enter Airfloat filtering pond after tiny wadding is spent and carry out air-dissolving air-float and filtration.The bubble diameter of this Airfloat filtering pond is at 10 μ m～15 μ m, and 30～100 μ m are much smaller compared with traditional air-dissolving air-float bubble diameter, is easier to the molecule band of some suspensions is got on.Therefore, can well remove fingers such as oils, SDI, turbidity, reach the water-quality guideline of recirculated cooling water.
Add sulfuric acid in the aerating regulation jar in the described step 1 and carry out the adjusting of pH value.
Inject sodium phosphate in the pipeline between described oil removal setting tank and hydrolization and acidification tank, to increase the phosphoric in the sewage.Owing to lack phosphoric in the Lurgi furnace coal gasification sewage, can not satisfy microorganism and newly become metabolism, growth and breeding demand, so before sewage advances biochemical system, suitably add the additional phosphoric of sodium phosphate salt to phosphoric.
In described coagulative precipitation tank, add the flocculation medicament, help to form flco;
An ozonizer is set, for the sewage that enters into the oxidizing reaction tower provides ozone on the pipeline between coagulative precipitation tank and the oxidizing reaction tower.Enter the oxidizing reaction tower behind ozone that ozonizer produces and the sewage thorough mixing.
The present invention is with respect to beneficial effect that prior art had:
1, adopts processing and the reuse of technology of the present invention to Lurgi furnace coal gasification sewage, a whole set of method good impact resistance, operating safety.Anti-temporary impact is strong, and treatment effect is influenced hardly; To bump, the COD treatment effect is unaffected, and the ammonia nitrogen treatment effect can variation, can recover normal automatically with interior in 5 days;
2, adopt UASB-A/O
2Biochemical process integration can be with Lurgi furnace coal gasification processing wastewater COD content stablely more than the 5000mg/l drop to about 450mg/l, ammonia nitrogen drops to below the 5mg/l;
3, preposition anoxic denitrification need not additional carbon, and under no aeration condition degraded portion C OD, save the energy;
4, the biochemical advanced treatment process of coagulating sedimentation-ozone oxidation-CBR3 can further drop to COD below the 60mg/l, colourity≤20 times;
5, adopt method of the present invention to make Lurgi furnace coal gasification sewage after treatment, its turbidity is less than 1NTU, and COD is less than 50mg/l, and colourity is less than 10 times, and water outlet promptly can be used as industrial circulating cooling water;
6, simple, the convenient management of a whole set of combination process flow process, working cost is relatively low, and unit load height, floor space are little.
Description of drawings
Fig. 1 is the related apparatus structure synoptic diagram of a kind of Lurgi furnace coal gasification wastewater treatment and reuse technology of the present invention.
Embodiment
For can being known, one of ordinary skill in the art understands technical scheme of the present invention, existing with the further explanation at large of specific embodiment do:
Method of the present invention relate to by the sewage export pipeline connect successively with lower device: as shown in Figure 1, aerating regulation jar 101, oil removal setting tank 102, hydrolization and acidification tank 103, denitrification pond 104, level vector fluidized-bed pond 105 (CBR1), activated sludge tank 106, the carrier fluidized bed pond 107 of secondary (CBR2), second pond 108, coagulative precipitation tank 110, oxidizing reaction tower 111, sky expose to the sun degassing tower 112, rearmounted carrier fluidized bed pond 113 (CBR3), Airfloat filtering pond 109.Wherein, a sulfuric acid injection device 114 is set above aerating regulation jar 101, on the sewage export pipeline between oil removal setting tank 102 and the hydrolization and acidification tank 103, sodium phosphate injection device 115 is set, be connected a mixed-liquor return pipe 118 in back, the carrier fluidized bed pond 107 of secondary (CBR2) with denitrification pond 104 front ends, bottom at second pond 108 is connected a mud return line 119 with denitrification pond 104 front ends, between coagulative precipitation tank and the oxidizing reaction tower ozonizer 117 is set.
With certain Lurgi furnace coal gasification factory the Lurgi furnace coal gasification process spent water is treated to example, the water quality of sewage is: chemical oxygen demand (COD) (COD) concentration 4904 ± 906mg/l; To between the 1500mg/l, B/C is about 0.25 at 1100mg/l for biochemical oxygen demand (BOD); Ammonia nitrogen concentration 194 ± 150mg/l; Total oily about 200mg/l, or surpass 300mg/l, mostly being the mink cell focus component, the lightweight oil component is less, handles water yield 60L/h:
Each unit main technologic parameters sees the following form:
Each process section water outlet COD and integrated artistic treatment effect:
Its treating processes comprises the steps:
Step 1: the coal gasification wastewater that will come from certain Lurgi furnace coal gasification factory adopts the perforated pipe blast aeration to stir in aerating regulation jar 101, makes sewage quality even, stable;
Step 2: will come from aerating regulation jar 101 and in oil removal setting tank 102, settling of floccus be arrived a jar end through even, stable sewage, make to float to the tank deck liquid level on the lightweight oil organic matter, thereby organism, toxic substance that the part in the sewage is difficult to biochemical degradation are separated;
Step 3: will come from oil removal setting tank 102 sewage after treatment and in hydrolization and acidification tank 103, solid matter is dissolved as that dissolved matter, macromolecular substance are degraded to small-molecule substance, carbohydrate degradation is that lipid acid, organic acid and dissolved nitrogenous compound are decomposed into ammonia, amine, carbonate and a spot of CO
2, H
2
Step 4: the sewage after will handling through step 3 is introduced denitrification pond 104, utilizes denitrifying bacteria that the nitrification liquid that refluxes is handled simultaneously, is gaseous nitrogen with nitrate-nitrogen reduction:
Step 5: will in level vector fluidized-bed 105 (CBR1) reaction tank, carry out aerobic reaction through the sewage that denitrification is handled, and carry out organic degraded and nitration reaction takes place;
Step 6:: the sewage after will carrying out aerobic reaction in level vector fluidized-bed 105 (CBR1) reaction tank is further removed chemical oxygen demand COD in activated sludge tank 116.
Step 7: in carrier fluidized bed 107 (CBR2) of secondary, carried out the processing of oxygen ammonia nitrogen removal carrier current, the nitrification liquid part of fully reacting of secondary carrier fluidized bed 107 (CBR2) nitrator is back to carries out denitrification in the denitrification pond 104 and handle, another part flow into the second pond 108 of next stage;
Step 8: bio-chemical effluent is carried out mud-water separation at second pond 108, simultaneously the part mud in the second pond 108 is back in the front end denitrification pond 104, guarantee denitrification and nitrated enough biomasss are arranged.
Step 9: will in coagulative precipitation tank 110, precipitate through second pond 108 oettIed sewages;
Step 10: will in coagulative precipitation tank 110, carry out sedimentary sewage and in oxidizing reaction tower 111, react by ozone with ozonizer 117 generations;
Step 11: will be in oxidizing reaction tower 111 sewage behind catalytic ozonation, utilize the perforated pipe blast aeration stripping residue ozone of the empty degassing tower 112 that exposes to the sun;
Step 12: utilize rearmounted carrier fluidized bed 113 (CBR3) to take off the COD pond, with biological process remove anhydrate in remaining organic contamination;
Step 13: the sewage after will handling through rearmounted carrier fluidized bed 113 (CBR3) carry out mixing soon in Airfloat filtering pond 109, flocculation, air supporting and filtration, obtain at last can reuse circulation cooling water.
Add sulfuric acid in the aerating regulation jar 101 in the step 1 and carry out the adjusting of pH value;
Inject sodium phosphate in the pipeline between oil removal setting tank 102 and hydrolization and acidification tank 103, to increase the phosphoric in the sewage;
In coagulative precipitation tank 110, add the flocculation medicament, help to form flco;
An ozonizer 117 is set, for the sewage that enters into oxidizing reaction tower 111 increases ozone amount on the pipeline between coagulative precipitation tank 110 and the oxidizing reaction tower 111.
Method of the present invention is widely used in the processing and the reuse of Lurgi furnace coal gasification sewage, and method is simple, flexible operation.Technical data can be used as Lurgi furnace coal gasification enterprise sewage disposal project engineering design foundation.
Claims (5)
1. a Lurgi furnace coal gasification wastewater treatment and reuse method is characterized in that, comprises the steps:
Step 1: the Shandong coal gasification wastewater that will come from Lurgi furnace coal gasification factory adopts the perforated pipe blast aeration to stir in the aerating regulation jar, makes sewage quality even, stable;
Step 2: will come from the aerating regulation jar and in the oil removal setting tank, settling of floccus be arrived a jar end through even, stable sewage, make to float to the tank deck liquid level on the lightweight oil organic matter, thereby organism, toxic substance that the part in the sewage is difficult to biochemical degradation are separated;
Step 3: will come from oil removal setting tank sewage after treatment and in hydrolization and acidification tank, solid matter is hydrolyzed to that dissolved matter, macromolecular substance are degraded to small-molecule substance, carbohydrate degradation is that lipid acid, organic acid and organonitrogen are decomposed into ammonia, amine;
Step 4: the sewage after will handling through step 3 is introduced the denitrification pond, utilizes denitrifying bacteria that the nitrification liquid that refluxes is handled simultaneously, is gaseous nitrogen with nitrate-nitrogen reduction;
Step 5: will in level vector fluidized-bed reaction pond, carry out aerobic reaction through the sewage that denitrification is handled, and carry out organic degraded and nitration reaction takes place;
Step 6:: the sewage after will carrying out aerobic reaction in level vector fluidized-bed reaction pond is further removed COD in activated sludge tank;
Step 7: in the carrier fluidized bed reaction tank of secondary, carried out the processing of oxygen ammonia nitrogen removal carrier current, the nitrification liquid part of fully reacting of the carrier fluidized bed reaction tank of secondary is back to carries out denitrification in the denitrification pond and handle, another part flow into the second pond of next stage;
Step 8: bio-chemical effluent is carried out mud-water separation at second pond, simultaneously the part mud in the second pond is back in the front end denitrification pond, guaranteeing has enough biomasss in denitrification pond and the nitrification tank;
Step 9: will in coagulative precipitation tank, precipitate through the second pond oettIed sewage;
Step 10: will in coagulative precipitation tank, carry out sedimentary sewage and in the oxidizing reaction tower, carry out decoloring reaction by ozone with the ozonizer generation;
Step 11: will be in the oxidizing reaction tower sewage behind catalytic ozonation, utilize the perforated pipe blast aeration stripping residue ozone of the empty degassing tower that exposes to the sun;
Step 12: utilize three rearmounted grade carrier fluidized-beds to take off COD, with biological process remove anhydrate in remaining organic contamination BOD;
Step 13: will in Airfloat filtering pond, carry out soon mixing through the sewage after the three grade carrier fluidized bed processing, flocculation, air supporting and filtration.
2. a kind of Lurgi furnace coal gasification wastewater treatment and reuse method according to claim 1 is characterized in that, adds sulfuric acid in the aerating regulation jar in the described step 1 and carries out the adjusting of pH value.
3. a kind of Lurgi furnace coal gasification wastewater treatment and reuse method according to claim 1 is characterized in that, injects sodium phosphate in the pipeline between described oil removal setting tank and hydrolization and acidification tank, to increase the phosphoric of sewage.
4. a kind of Lurgi furnace coal gasification wastewater treatment and reuse method according to claim 1 is characterized in that, adds the flocculation medicament in described coagulative precipitation tank, helps to form flco.
5. a kind of Lurgi furnace coal gasification wastewater treatment and reuse method according to claim 1 is characterized in that, an ozonizer is set, for the sewage that enters into the oxidizing reaction tower provides ozone on the pipeline between coagulative precipitation tank and the oxidizing reaction tower.
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