CN108128965A

CN108128965A - A kind of coal chemical industry wastewater zero emission treatment method

Info

Publication number: CN108128965A
Application number: CN201611090755.0A
Authority: CN
Inventors: 高本修; 彭艳容
Original assignee: Inner Mongolia Datang International Hexigten Coal & Gas Co Ltd
Current assignee: Inner Mongolia Datang International Hexigten Coal & Gas Co Ltd
Priority date: 2016-11-30
Filing date: 2016-11-30
Publication date: 2018-06-08

Abstract

The invention discloses a kind of coal chemical industry wastewater zero emission treatment methods.The technique that this method uses gas liquor separation+phenol recovery ammonia+biochemical treatment+advanced treating+Treated sewage reusing+strong brine film concentration+multiple-effect evaporation, classification processing and the complete-reclaiming of the coal chemical industrial waste waters such as crushed coal pressure gasifying waste water, sanitary sewage, initial rainwater, methanol waste water, chemistry water acidic and alkaline waste water processed, Ion exchange resin acidic and alkaline waste water, turbid circulating water sewerage, chemical examination waste water, accident waste water can be achieved, finally realize wastewater zero discharge.Coal chemical industrial waste water water quality, the frequent fluctuation of water are coped with by building the measures such as big volume adjustment pond, emergency pool；By setting activated coke absorption, coagulating sedimentation, biological aerated filter BAF, becoming the measures such as hole filtering pool to biochemical treatment water outlet progress advanced treating；By the way that immersion ultrafiltration, reverse osmosis membrane filtration device is set to carry out upgrading reuse to waste water；By the way that film concentration and multi-effect evaporating device is set to carry out Treatment for Reuse to concentrated water with high salt.

Description

A kind of coal chemical industry wastewater zero emission treatment method

Technical field

The present invention relates to a kind of coal chemical industry wastewater treating method more particularly to a kind of coal chemical industry wastewater zero emission processing sides Method.

Background technology

For the resources characteristic of the few oily lean gas of China's richness coal, China was natural as the coal liquifaction in source, coal system using coal in recent years The New Coal Chemicals such as gas, coal-to-olefin, ammonia from coal flourish, but New Coal Chemical enterprise their location is mostly that ecology is crisp Weak, water resources shortage area, in addition national environmental requirement are constantly tightened, and develop a kind of novel waste water zero discharge treatment process Technology realizes waste water complete-reclaiming, reduces the pollution to environment, very necessary.

At present, in order to realize water-saving, the emission reduction of coal chemical industry, the utilization rate of water resource is improved, is reduced environmental pollution, to coalification Work waste water employs diversified processing method, and main methods have：At the physics such as gravitational settling, distillation, extraction Reason method detaches the pollutant in coal chemical industrial waste water；Pass through anaerobic hydrolysis-acidification, AO, A₂O, OAAO, SBR, MBR etc. are raw Change processing method to degrade to the pollutant in waste water.The pollutant that can be reduced by these methods in coal chemical industrial waste water is dense Degree, but since pollutants in coal chemical industry wastewater concentration is high, type is complicated, it is a variety of containing oils, phenol, ammonia nitrogen and naphthalene, anthracene, pyridine etc. Polluter, and biodegradability is poor (B/C ＜ 0.3), so can not be handled coal chemical industrial waste water by these above-mentioned methods to returning It is required with water, realizes complete-reclaiming.Coal chemical industrial waste water is carried in view of the above problems, modified technique employs membrane filtering method Matter, but meet with fouling membrane predicament, it is difficult to continuous and steady operation, and concentrated water process problem with high salt can not be solved, it can only will be highly concentrated Brine drains into natural evaporation facility outside factory.

Invention content

The object of the present invention is to provide a kind of coal chemical industry wastewater zero emission treatment method, this method using gas liquor separation+ The technique of phenol recovery ammonia+biochemical treatment+advanced treating+Treated sewage reusing+strong brine film concentration+multiple-effect evaporation is, it can be achieved that broken coal adds Press gasification waste water, sanitary sewage, initial rainwater, methanol waste water, chemistry water acidic and alkaline waste water, Ion exchange resin acidic and alkaline waste water, turbid The classification of the coal chemical industrial waste waters such as recirculating water blowdown water, chemical examination waste water, accident waste water (including technology accident and fire-fighting accident waste water) Processing and complete-reclaiming, finally realize wastewater zero discharge.

A kind of coal chemical industry wastewater zero emission treatment method provided by the invention, includes the following steps：

(1) gas liquor separation and phenol recovery ammonia：The gas liquor that crushed coal pressure gasifying is generated is sent into coal gas water separation device In be de-gassed, dedusting, recycling tar, middle oil and dust-laden tar are then fed into phenol ammonia recovery unit and recycle ammonia and crude phenols, together When remove solution gas；

(2) biochemical treatment：Sanitary sewage, initial rainwater and chemical examination waste water are sent into the floating in grid canal removal waste water Object；The water outlet of grid canal is entered into the grease in oil partiting precipitation pool removing waste water together with methanol waste water, accident waste water；

The waste water handled through step (1) and oil partiting precipitation pool water outlet are sent into comprehensive adjustment pond together and carry out water quality and quantity tune Section；The water outlet of comprehensive adjustment pond is sequentially sent to carry out biochemical treatment in anaerobic hydrolysis acidification tank, A/O ponds and secondary settling tank, collects two Heavy pond supernatant；

(3) advanced treating：It will be sent into activated coke adsorption tank and be carried out at absorption through second pond supernatant described in step (2) Reason, obtains burnt aqueous mixtures；The burnt aqueous mixtures are subjected to flocculation sediment processing, collect supernatant；The supernatant is sent into Biological membrane degradation, filtration treatment are carried out in biological aerated filter；

(4) Treated sewage reusing：The waste water handled through step (3) is sent into immersion ultrafiltration apparatus and carries out ultrafiltration, ultrafiltration goes out Moisturizing reuse of the water part as turbid circulating water, another part carry out reverse osmosis deaslination, collect reverse osmosis produced water and reverse osmosis Concentrated water；The reverse osmosis produced water fills into plant area's former pond as raw water；

(5) strong brine film concentrates：

5-1) Treated sewage reusing reverse osmosis concentrated water and the concentration of turbid circulating water blowdown moisture film：It will be reverse osmosis concentrated described in step (4) Water be sequentially sent to after homogeneous is mixed in regulating reservoir with turbid circulating water system sewerage mechanical accelerating purifying pool, become hole filtering pool, It clarifies in pond and self-cleaning filter, self-cleaning filter water outlet is then subjected to ultrafiltration and nanofiltration successively, collect nanofiltration production Water and nanofiltration concentrated water；Nanofiltration production water is subjected to reverse osmosis deaslination, collects reverse osmosis produced water and reverse osmosis concentrated water；It will be described anti- It permeates concentrated water and carries out concentrated water reverse osmosis deaslination, collect concentrated water reverse osmosis concentrated water and concentrated water reverse osmosis produced water；The reverse osmosis produced water With the concentrated water reverse osmosis produced water plant area's former pond is filled into as raw water；

5-2) acidic and alkaline waste water film concentrates:Chemistry water acidic and alkaline waste water and Ion exchange resin acidic and alkaline waste water are sequentially sent to machinery Accelerating purifying pool and change hole filtering pool；The water outlet of change hole filtering pool is carried out ultrafiltration and regenerates reverse osmosis, collection regeneration reverse osmosis successively Production water and regeneration reverse osmosis concentrated water thoroughly；It is laggard that the reverse osmosis concentrated water is sequentially sent to mechanical accelerating purifying pool, change hole filtering pool Nanofiltration production water and nanofiltration concentrated water are collected in row nanofiltration；The nanofiltration concentrated water is sent into vibration film device, collect vibrating membrane production water and is shaken Dynamic film concentrated water；Water is produced into the nanofiltration and vibrating membrane production water carries out vibrating together reverse osmosis, collection vibration reverse osmosis produced water With vibration reverse osmosis concentrated water；The regeneration reverse osmosis produced water and the vibration reverse osmosis produced water fill into plant area's raw water as raw water Pond；

(6) multiple-effect evaporation：By step 5-1) described in nanofiltration concentrated water, the concentrated water reverse osmosis concentrated water, step 5-2) in institute State vibrating membrane concentrated water, the vibration reverse osmosis concentrated water is sent into multi-effect evaporating device and is evaporated crystallization, collection evaporative condenser together Liquid and crystal salt；Moisturizing reuse of the evaporation condensate as turbid circulating water.

In above-mentioned method, in step (1), the crushed coal pressure gasifying is one of coal gasifying process, which is producing A large amount of high pollution, high-concentration coal gasification waste water can be generated in the process, and water-quality constituents is extremely complex, and pollutional load is very high.

The gas liquor is de-gassed through vacuum flashing, without techniques such as pressure gravitational settling, oil slick, filterings, dedusting, returns successively Receive tar, middle oil and dust-laden tar.The coal gas water separation device includes but not limited to：Dust-laden gas liquor expander, first tar Separator, final oil eliminator and double medium filters etc.；The gas liquor separation is as follows：By the gas liquor It is sent into dust-laden gas liquor expander after cooling and is de-gassed through vacuum flashing；The water outlet of dust-laden gas liquor expander is sent into just burnt Through without pressure gravitational settling and oil slick separation and recovery tar and dust-laden tar in oil eliminator；The water outlet of first tar separator is sent into most Oil in coke filtration and the further recycling of water-oil separating is carried out in whole oil eliminator；The water outlet of final oil eliminator (is contained into suspension The substances such as solid, oil and tar) it is sent into double medium filters and removes impurity, collect double medium filter water outlets, you can realize The gas liquor separation.

After gas liquor separation, oily content is less than 700mg/L (such as 200~300mg/L).

What coal gas water separation device came passes through the works such as depickling, deamination, pre-extracted, extraction, solvent air lift containing ammonia, phenol wastewater Skill processing procedure, ammonia and crude phenols in gas recovery water, while remove the solution gas in waste water.The ammonia of recycling is as power boiler The raw material of flue gas ammonia method desulfurizing uses.The phenol ammonia recovery unit includes but not limited to：Extracting tower, deammoniation tower, static mixer, Oil water separator, phenol tower, packed extraction tower and water tower etc.；The ammonia phenol recycling is as follows：By the coal gas moisture It is discharged to be sent into extracting tower from device and removes solution gas, be then fed into deammoniation tower and carry out deamination；By by deamination waste water with Extractant, which is sent into together in static mixer, carries out pre-extracted, collects mixed liquor；The mixed liquor is sent into oil water separator Water-oil separating is carried out, upper strata solvent is mutually sent into phenol tower and recycles crude phenols；Lower floor's phenol water phase in the phenol is sent into filler It is extracted in extraction tower；Dilute phenol water of packed extraction tower tower reactor outflow is sent into water tower and carries out solvent stripping recycling, Collect the alkene phenol water of bottom of towe, you can realize the ammonia phenol recycling.

After ammonia phenol recycling, total phenol concentration≤700mg/L (such as 400~700mg/L) in the waste water, ammonia nitrogen is dense Degree≤150mg/L (such as 90~150mg/L).

Above-mentioned preparation method, in step (2), the machinery rotation grid in the grid canal can remove the bulk in waste water Floating material；The grid gap of machinery rotation grid in the grid canal can be 2~5mm (such as 3mm)；

The oil partiting precipitation pool is removed the grease in waste water by truss-like the Skimming oil and Scraping sediment Machine.

The accident waste water includes technology accident waste water and fire-fighting emergency pool waste water, i.e. emergency pool (technology accident water Pond and the non-recurrent water of fire-fighting emergency pool) water.

Water quality and quantity is adjusted specific as follows in the comprehensive adjustment pond：Hydrochloric acid and sodium hydroxide are added by acid adding adder-subtractor PH value of waste water is adjusted, pH value is made to maintain between 6~9；By the stirring action of blender underwater in regulating reservoir, make difference Source, different flow, different quality, different temperatures waste water be sufficiently mixed, water quality obtains uniform；By heating coil to waste water Water temperature is adjusted；The water for entering subsequent biochemical system is adjusted in storage by regulating reservoir, cushioning effect simultaneously, Biochemical treatment system is made to be in stable state.The comprehensive adjustment pond carries out capping setting.

The anaerobic hydrolysis acidification tank uses the structure type of UASB.The structure type of the UASB is concretely：UASB Bottom sets back with water inlet line (such as 18) water distribution uniformity, and top sets two layers of three phase separator to realize the separation of gas, liquid, solid, Water outlet after separation is imported through stainless steel effluent weir in outlet canal, and the gas that three phase separator is collected is through the activity in deodorization device It is emptied after charcoal adsorption treatment.The Chi Ding of the anaerobic hydrolysis acidification tank uses fiberglass head cover.The anaerobic hydrolysis acidification tank is also Equipped with loop heating system.

The A/O ponds are Prepositive denitrification, and mixing water inlet, flow back nitrification liquid and returned sludge.O ponds layout is using gallery Formula.O ponds aeration mode uses centrifugal blower as gas supply means, using pore type aerator.Every group of exposure in the aerator Tracheae is respectively provided with a vent line.Setting defoaming water pipeline in O ponds.The A/O ponds are by the way of totally-enclosed capping.

The secondary settling tank is radical sedimentation basin；The water outlet of A/O ponds enters secondary settling tank from central cylinder of secondary settling pond and carries out muddy water point From sludge enters secondary settling tank collection mud sump through scraping and sucking machine, and partial concentration sludge is back to A ponds to maintain sludge through sludge reflux pump Concentration, excess sludge is outer after residual sludge pump drains into storage basin dehydration to be arranged.

After the biochemical treatment, ammonia nitrogen concentration≤15mg/L (such as 5~15mg/L) in waste water；CODcr≤350mg/L (such as 250~350mg/L).

Above-mentioned preparation method, in step (3), the second pond supernatant before the activated coke adsorption tank is sent into also Including the second pond supernatant, activated coke filter press filtrate and flushing water to be sent into the step being uniformly mixed in buffering pond together Suddenly.The buffering pond sets a reflux pipeline to regulating reservoir, for returning waste water when the water outlet of main biochemical system is exceeded It flows in regulating reservoir.

Activated coke used in the activated coke adsorption tank (coke powder, active coke powder) is one that lignite obtains after processing Kind porosity sorbing material, the grain size of the activated coke can be 74~280 μm, and heap density can be 450~650Kg/m³, specific surface Product can be 200~300m²/g.The adsorption treatment can make the macromolecular hard-degraded substance in the activated coke absorption waste water.

The step of flocculation sediment processing, is as follows：The burnt aqueous mixtures are sent into coagulating basin and are mixed with flocculant, Then gravity flow, which enters in activated coke sedimentation basin, carries out flocculation sediment, obtains solidliquid mixture and collects supernatant.The flocculant Using flocculant common in sewage treatment field, including but not limited to：Aluminium polychloride (PAC), polyacrylamide (PAM). The flocculant can be added by flocculant concentration system.The solidliquid mixture is the flocculant and coke powder, water it is mixed Close object.Flocculation sediment, that is, the activated coke is detached with waste water, and macromolecular hard-degraded substance is with activated coke discharge system together.It is described Activated coke mixes burning reuse after filter press is dehydrated as feed coal, and filtrate returns to buffering pond.

The supernatant may also include before sequentially entering biological aerated filter by the supernatant and sanitary sewage, methanol The step of waste water is sent into intermediate pool and is stirred evenly together is incorporated to biochemical sewage, the purpose of methanol waste water is filtered for aeration and biological Pond provides nutriment.

The biological aerated filter (BAF) may include level-one biological aerated filter (level-one BAF) and the filter of two level aeration and biological Pond (two level BAF).The supernatant can only be sent into level-one biological aerated filter, can also be sequentially sent to level-one biological aerated filter and Two level biological aerated filter.The method may also include after biological aerated filter is sent into will water outlet be sent into become hole filtering pool into The step of row filtration treatment.

After the advanced treating, ammonia nitrogen concentration≤5mg/L (such as 2~5mg/L) in waste water；CODcr≤80mg/L (such as 60~80mg/L).

Above-mentioned method, in step (4), the ultrafiltration can remove macromolecular suspended matter；In the immersion ultrafiltration apparatus The aperture of ultrafiltration membrane can be 0.01~0.05 μm (such as 0.04 μm), can molecular cut off be 1000~100000 organic matter；Material Matter can be any in makrolon, polyvinyl chloride and Kynoar.

Reverse osmosis membrane can retain the organic matter of dissolving salt and molecular weight more than 100 used by the reverse osmosis deaslination；Material Matter can be any one of cellulose acetate, aromatic polyamide.

After Treated sewage reusing processing, salt content≤100mg/L in Treated sewage reusing reverse osmosis produced water (such as 30~ 100mg/L)；CODcr≤5mg/L (such as 2~5mg/L)；Ammonia nitrogen concentration≤5mg/L (such as 3~5mg/L).

Above-mentioned method, step 5-1) in, in the mechanical accelerating purifying pool, through adding magnesia, sodium hydroxide, Coagulant (such as PAC), flocculant (such as PAM) make suspended matter and partial impurities precipitation in regenerative wastewater, so as to remove in waste water Suspended matter and partial impurities.

In the change hole filtering pool, fine particle and suspended matter in waste water are further removed, and water is obtained into one Step clarification, substantially reduces the turbidity in water.

The change hole filtering pool production water is collected into the clarification pond.

The self-cleaning filter can further remove the suspended particulate of collection in the clarification pond etc..

The aperture for the ultrafiltration membrane that the ultrafiltration uses can be 0.01~0.05 μm, can molecular cut off be 1000~100000 Organic matter；Material can be any in makrolon, polyvinyl chloride and Kynoar.

NF membrane can retention part divalent ion (such as bivalent metal ion used by the nanofiltration：Ca²⁺、Mg²⁺Deng) and The organic matter of molecular weight 200~400；Material can be any in cellulose acetate, aromatic polyamide.Nanofiltration device may include 3 covering devices, it can be level-one three-stage structure often to cover nanofiltration device, and the water inlet of third section may be provided with inter-section booster.The nanofiltration it Before be additionally included in ultra-filtration water add medicament (such as hydrochloric acid, fungicide, reducing agent, antisludging agent) and use nanofiltration cartridge filter Step is filtered to obtain, to go remaining particulate matter in water removal.

Reverse osmosis membrane can retain the organic matter of dissolving salt and molecular weight more than 100 used by the reverse osmosis deaslination；Material Matter can be cellulose acetate, aromatic polyamide it is any.The reverse osmosis deaslination is that the nanofiltration is produced water to be sent into level-one Reverse osmosis membrane apparatus (level-one RO devices), obtains first-stage reverse osmosis concentrated water；The first-stage reverse osmosis concentrated water is sent into two-pass reverse osmosis Film device (two level RO film devices), the step of obtaining two-pass reverse osmosis concentrated water；The first-stage reverse osmosis film device includes 3 covering devices, Often suit is set to two segment structure of level-one, and second segment is provided with inter-section booster；The two-pass reverse osmosis film device includes 1 suit It puts, is two segment structure of level-one per section apparatus, second segment is provided with inter-section booster.It may additionally include before the reverse osmosis deaslination RO antisludging agents are added in the nanofiltration production water and step is filtered to obtain using RO cartridge filters.

By the step 5-1) processing after, the reverse osmosis produced water conductance≤1000us/cm (such as 420~1000us/ cm)；CODcr≤10mg/L (such as 2~5mg/L)；Ammonia nitrogen concentration≤5mg/L (such as 2~5mg/L), the concentrated water reverse osmosis produced water Conductance≤1500us/cm (such as 1000~1500us/cm)；CODcr≤10mg/L (such as 5~10mg/L)；Ammonia nitrogen concentration≤5mg/L (such as 2~5mg/L).

Above-mentioned method, step 5-2) in, in the mechanical accelerating purifying pool, through adding sodium carbonate, sodium hydroxide, Coagulant, flocculant make suspended matter and partial impurities precipitation in regenerative wastewater, miscellaneous so as to remove suspended matter and part in waste water Matter.

In the change hole filtering pool, fine particle and suspended matter in waste water are further removed.

Reverse osmosis membrane can retain the organic matter of dissolving salt and molecular weight more than 100 used by the regeneration is reverse osmosis；Material Matter can be cellulose acetate, aromatic polyamide it is any.

NF membrane can retention part divalent ion (such as bivalent metal ion used by the nanofiltration：Ca²⁺、Mg²⁺Deng) and The organic matter of molecular weight 200~400；Material can be any in cellulose acetate, aromatic polyamide.The NF membrane is optional Selecting property retains macromolecular substances.

Vibrating membrane employed in the vibration film device can retain the organic matter of dissolving salt and molecular weight more than 100, material Matter can be any one of cellulose acetate, aromatic polyamide, and vibration frequency is 50~60HZ.Due to the vibration film device The middle continuous effect of vibration of diaphragm, in waste water residual salt and small-molecule substance can pass through vibrating membrane together with nanofiltration production water into The row vibration is reverse osmosis.

It is organic more than 100 can to retain dissolving salt and molecular weight for vibration reverse osmosis membrane used by the vibration is reverse osmosis Object；Material can be any one of cellulose acetate, aromatic polyamide.

By the step 5-2) processing after, it is described regeneration reverse osmosis produced water and it is described vibration reverse osmosis produced water conductance ≤ 800us/cm (such as 600~800us/cm)；CODcr≤5mg/L (such as 2~5mg/L)；Ammonia nitrogen concentration≤5mg/L (such as 3~ 5mg/L)。

Above-mentioned method, in step (6), the multi-effect evaporating device is triple effect evaporation evaporator.

After the multiple-effect evaporation, conductivity≤800us/cm (such as 100~300us/cm) of the evaporation condensate.

The present invention has the advantages that：

(1) it is given up by building the measures reply coal chemical industry such as big volume adjustment pond, emergency pool, multi-series mutually standby device in parallel Water water quality, the frequent fluctuation of water；

(2) by setting activated coke filling adsorption, coagulating sedimentation, biological aerated filter BAF, becoming the measures pair such as hole filtering pool Biochemical treatment water outlet carries out advanced treating, ensures the influent quality of membrane filtration treatment process, slows down film dirt and block up；

(3) by the way that immersion ultrafiltration, reverse osmosis membrane filtration device is set to carry out upgrading reuse to waste water；

(4) by the way that film concentration and multi-effect evaporating device is set to carry out Treatment for Reuse to concentrated water with high salt, it is truly realized coalification The complete-reclaiming of work waste water and zero-emission.

Description of the drawings

Fig. 1 is the process flow chart of coal chemical industry wastewater zero emission treatment method of the present invention.

Specific embodiment

Experimental method used in following embodiments is conventional method unless otherwise specified.

The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.

Embodiment 1, processing coal chemical industrial waste water

Zero discharge treatment is carried out to coal chemical industrial waste water according to process flow chart shown in Fig. 1, is as follows：

(1) gas liquor separation and the recycling of ammonia phenol：

1) gas liquor detaches：

Will crushed coal pressure gasifying generate gas liquor be sent into coal gas water separation device in be de-gassed, dedusting, recycling tar, Middle oil and dust-laden tar, are as follows：

The coal gasifying process that Inner Mongol Datang world Ke Shike rises the selection of natural gas from coal projects is broken coal pressurization gas Micronizing technology can generate a large amount of high pollution, high-concentration coal gasification waste water in the art production process, and water-quality constituents is extremely multiple Miscellaneous, pollutional load is very high.

3.5MPa, the 199 DEG C of high pressure dust-laden gas liquors come from crushed coal pressure gasifying cool to 70 DEG C through heat exchange.After cooling Gas liquor enter dust-laden gas liquor expander, 120KPa is expanded to, close to atmospheric pressure.It is depressurized by expander, in gas liquor The gas flash separation of dissolving out becomes expansion gas.Gas liquor individually enters by gravity in corresponding just tar separator Carry out gravity settling separation.Gas liquor enters the center of first tar separator by central tube, radially flows into separator Wall, sticky dust-laden tar and most of tar heavy oil are deposited to the conical lower portion of separator.Respectively there is tar separator at the beginning of every Two electronic mud scrapers, tar and dirt to be prevented to be deposited on separator wall.The temperature of first tar separator maintain 65 DEG C~ Between 90 DEG C.In separator lower part, the smaller pure tar of density is separated by buoyancy, and by an external adjustable overflow pipe from Separator is discharged, and pure tar is sent to tank field, and dust-laden tar is separated from the bottom of first tar separator, directly entrucking on the spot. Gas liquor flows to endless groove through overflow pipe, then enters final oil eliminator by gravity.

Gas liquor is entered by the bottom of final oil eliminator, initially enters coke filtration frame after coke filtration to upstream, In uphill process, small oil droplet is made mutually to collide to form big oil droplet, to promote oil, water detaches.In the separation process of oil, Some oil droplets leave coke filtration frame and directly rise to liquid level, and the middle oil collected in the gathering room of final oil eliminator is finally sent Toward tank field.

In gas liquor after final separator detaches, also containing substances such as suspended solid, oil and tar, through double medium mistakes Filter is further processed, and removes impurity.Gas liquor enters double medium filters from top, then after bed filtration on earth Portion, air water storage tank of delivering coal after filtering pump out battery limit (BL) to phenol by product gas liquor and recycle.

Waste water total phenol concentration after gas liquor detaches：5160~8600mg/L；Total ammonia density：6570~11500mg/L； CODcr：13576~28500mg/L；Carbon dioxide content：1300~1600mg/L；PH value：9~10；Oil：200~300mg/ L。

2) phenol recovery ammonia：

Above-mentioned gas liquor is discharged and is sent into recycling ammonia and crude phenols in ammonia phenol retracting device, while deviates from solution gas, it is specific to walk It is rapid as follows：

1.1MPa (g) from gas liquor centrifugal station, 37 DEG C of raw material waste water are divided into two-way, all the way through phenol water and cycle Cooling water heat exchange is cooled to 37 DEG C or so (if supplied materials temperature can surmount phenol water cooler, by-passing behaviour no more than 37 DEG C Make), as the filler epimere cold feed of extracting tower, to control tower top temperature；Another way raw material wastewater heat exchange is made to after 145 DEG C For the hot feed of extracting tower, on first piece of tower tray of extracting tower.Extracting tower is added using 0.5MPa, 158 DEG C of steam Heat removes the sour gas dissolved in raw material waste water.

Extracting tower bottom of towe wastewater heat exchange is cooled to about 130 DEG C or so and enters the progress deamination processing of deammoniation tower top.Deammoniation tower The thick ammonia of overhead extraction carries out gas-liquid after ammonia first-stage condenser is cooled to 125~140 DEG C or so, into level-one liquid separation tank Separation, gas ammonia from top discharge, through ammonia secondary condenser heat exchange be cooled to 70~90 DEG C or so after, into two level liquid separation tank into Row gas-liquid separation, gas ammonia are produced from top, enter three-level liquid separation tank after the heat exchange of ammonia three-level condenser is cooled to 50 DEG C or so. Level-one liquid separation tank, two level liquid separation tank, three-level liquid separation tank lower liquid phase enter ammonia lime set and divide oil tank, and the light oil in ammonia lime set is mutually upper It chromatographs out, heavy oil is mutually discharged in bottom, and the ammonia lime set after recycling light oil, heavy oil is by the overhead reflux as deammoniation tower after pump boosting Return to deammoniation tower.The rich ammonia that three-level liquid separation tank top comes out enters ammonia absorber cooler shell side, with fresh water (or soft water) Spray-absorption absorbs into 25% ammonium hydroxide, while releases a large amount of heat, in the heat that absorption process is released by the circulating cooling of tube side Water is taken away.25% ammonium hydroxide enters weak aqua ammonia tank, and be pumped to power-section by weak aqua ammonia makes as the raw material of process of desulfurization for boiler flue gas With.Deammoniation tower is heated using 1.0MPa, 184 DEG C of steam.

Deammoniation tower bottom of towe wastewater heat exchange enters pre-extracted/extraction part after being cooled to 35~45 DEG C, extracts with Di Iso Propyl Ether Agent is taken together to enter in static mixer to be mixed, mixed liquor enters oil water separator layering.

Phenol tower is sent into the solvent phase overflow of oil water separator upper strata, is heated with 2.5Mpa, 225 DEG C of saturated vapors, phenol tower Enter solvent circulating slot after the cooling condensation of overhead extraction Di Iso Propyl Ether steam to recycle, phenol tower tower reactor crude phenols are as heavy constituent Extraction is sent to tank field crude phenols storage tank.

Lower floor's phenol water phase carries out liquid-liquid extraction by entering packed extraction tower top and extractant counter current contacting after pumping pressurization It takes.The dilute phenol water of ether-containing that packed extraction tower tower reactor comes out exchanges heat to entering water tower after 85 DEG C and carry out diisopropyl ether solvents and strips back It receives.Water tower is heated with 0.5Mpa, 158 DEG C of low-pressure saturated steams, and at 65 DEG C or so, bottom temperature controls for head temperature control At 110 DEG C or so.Enter solvent circulating slot, dilute phenol water cooling that tower bottom comes out after the ether steam cooling condensation that water tower is stripped off But to going subsequent biochemical processing further degradation after 40 DEG C.

Waste water total phenol concentration after phenol recovery ammonia：400~700mg/L；Ammonia nitrogen concentration：90~150mg/L；CODcr： 3000~5000mg/L；PH value：7~8.5 or so；Oil：20~30mg/L.

(2) biochemical treatment

Sanitary sewage, initial rainwater and chemical examination waste water are sent into the floating material in grid canal removal waste water；Grid canal is gone out Water enters the grease in oil partiting precipitation pool removing waste water together with methanol waste water, accident waste water；By the waste water handled through step (1) It is sent into comprehensive adjustment pond together with oil partiting precipitation pool water outlet and carries out water quality and quantity adjusting；The water outlet of comprehensive adjustment pond is sequentially sent to detest Biochemical treatment is carried out in oxygen hydrolysis acidification pool, A/O ponds and secondary settling tank, collects second pond supernatant；It is as follows：

Sanitary sewage, initial rainwater from plant area, chemical examination waste water initially enter grid canal, are returned through the machinery in grid canal Turn the agglomerate floater in grid (grid gap is 3mm) removal waste water.Grid canal is discharged and methanol waste water, emergency pool (technique thing Therefore pond and the non-recurrent water of fire-fighting emergency pool) water together enter oil partiting precipitation pool.Oil partiting precipitation pool is skimmed by truss-like Oily Slag Scraping Device removes the grease in waste water, is discharged and carrys out together with waste water to enter comprehensive adjustment pond progress water quality water with phenol ammonia recovery unit Amount is adjusted.Water quality and quantity adjusts specific method：Hydrochloric acid and sodium hydroxide is added to carry out pH value of waste water by acid adding adder-subtractor It adjusts, pH value is made to maintain between 6~9；By the stirring action of blender underwater in regulating reservoir, make separate sources, different flow, Different quality, different temperatures waste water be sufficiently mixed, water quality obtains uniform；Waste water water temperature is adjusted by heating coil； Storage by regulating reservoir, cushioning effect simultaneously are adjusted the water for entering subsequent biochemical system, make biochemical treatment system In stable state.When intaking exceeded, accident pool can switch to.For Winter protection and sand-proof, regulating reservoir is capped, Coil pipe is set to heat in pond.

Anaerobic hydrolysis acidification tank UASB is sent into the water outlet of comprehensive adjustment pond after sewage pump pressurizes.Anaerobic hydrolysis acidification tank Using the structure type of UASB, UASB bottoms set 18 back with water inlet line water distribution uniformities, and top sets two layers of three phase separator Realize the separation of gas, liquid, solid.Water outlet after separation is imported through stainless steel effluent weir in outlet canal, the gas that three phase separator is collected Body empties after the activated carbon adsorption processing in deodorization device.For Winter protection and sand-proof, hydrolysis acidification pool top uses glass Glass steel head cover.During to prevent winter from stopping production in pond freeze and system primary starting, spy be provided with cycle heating system, by detesting Itself cycle heating of oxygen pond, reaches being uniformly distributed for heat, avoids the occurrence of icing phenomenon.Anaerobic hydrolysis acidification tank water outlet flows into certainly Enter A/O systems.

A/O ponds are Prepositive denitrification, and diving mixer, mixing water inlet, reflux nitrification liquid and reflux dirt are set inside A ponds Mud, for O ponds layout using gallery type, there are three gallerys altogether, set one of partition wall, side water outlet in third gallery, opposite side returns It flow to A ponds.O ponds aeration mode uses centrifugal blower as gas supply means, using pore type aerator.To prevent aeration pipeline product Water, every group of aeration tube are respectively provided with a vent line.To prevent foam overflow, defoaming water pipeline is set in pond.In order to which winter protects Mild sand-proof, A/O ponds are by the way of totally-enclosed capping.The water outlet of A/O ponds enters secondary settling tank.

Secondary settling tank uses radical sedimentation basin, and every secondary settling tank sets a scraping and sucking machine, can effectively prevent digestion It floats.The water outlet of A/O ponds enters secondary settling tank from central tube and carries out mud-water separation, and thickened sludge enters secondary settling tank collection mud through scraping and sucking machine Pond, partial concentration sludge are back to A ponds to maintain sludge concentration through sludge reflux pump, and excess sludge drains into storage through residual sludge pump Mud sump.Secondary settling tank surface scum is collected by scraping and sucking machine scraper surface, and flows into collecting-tank in station through pipeline.Supernatant is through going out Mill weir enters bio-chemical effluent pond, finally enters the processing of advanced treating section.

Storage basin collects the excess sludge of secondary settling tank discharge, the sludge of oil partiting precipitation pool sludge bucket discharge, backwash discharge water The thickened sludge of pond discharge, agitated machine are delivered to belt mud dewatering equipment by screw pump after mixing.To improve sludge Dehydrating effect adds PAM during sludge dewatering by PAM medicine systems.With medicinal water and dosing pipeline flushing water using production Water is as water source.

The filtrate and flushing waste water that sludge dewatering equipment generates flow to collecting-tank in station certainly, are beaten by pump to accident pool or tune Save pond.The mud cake of generation is periodically transported outward.

Waste water after biochemical treatment：Ammonia nitrogen concentration：5~15mg/L；CODcr：250~350mg/L.

(3) advanced treating

It will be sent into activated coke adsorption tank through second pond supernatant in step (2) and carry out adsorption treatment, and obtain burnt aqueous mixtures； Burnt aqueous mixtures are subjected to flocculation sediment processing, collect supernatant；Supernatant is sent into biological aerated filter and carries out biomembrane Degradation, filtration treatment；It is as follows：

Collect the water outlet of bio-chemical effluent pond, backwash discharge pond supernatant, preparation plant trench in the buffering pond of advanced treating section Sewerage, lift pump room trench sewerage, vacuum belt dewaterer filtrate and flushing water.Agitated machine passes through suction after mixing Attached pond water inlet is pumped to adsorption tank.In order to ensure the effect of activated coke absorption and coagulation, coil pipe is set to heat in pond.If main life The water outlet of change system is exceeded, sets a reflux pipeline to regulating reservoir.

(active coke powder is a kind of porosity sorbing material that lignite obtains after processing to coke powder, and grain size is 74~280 μ M, heap density are 450~650Kg/m³, specific surface area is 200~300m²/ g) by coke powder dosing system formed coke powder lotion after It is directly entered in adsorption tank, removes macromolecular substance difficult to degrade after the mixing and absorption in adsorption tank.Coke after absorption Aqueous mixtures enter coagulating basin, and sewage is sufficiently mixed with flocculant PAC, PAM from flocculant concentration system, and water outlet flows into certainly Enter sedimentation basin and carry out Jiao Shui separation.Sedimentation basin supernatant flows into intermediate pool certainly.

Intermediate pool collects sedimentation basin water outlet, filter tank piping lane sewerage, backwash discharge pond supernatant, while for biology Filter tank water inlet biodegradability, respectively sets the pipeline of a sanitary sewage and methanol waste water to enter intermediate pool.Agitated machine mixing After uniformly biological aerated filter BAF is pumped to by being promoted.

Level-one BAF water inlets enter the total canal of water distribution, uniform water distribution to each water distribution distributing canal, and the water outlet of water distribution distributing canal enters pond from lower part Interior, after biological membrane degradation filtration treatment, level-one BAF water outlets are from graduation two water channel is flowed into again from inflow two level BAF, two level BAF From flowing to variable orifice gap filter tank, level-one BAF, which discharges water to setting on the pipeline of two level BAF and surmounts pipeline, to be gone to become hole filtering pool for water outlet.

BAF backwash waters come from reuse pool, and pond concentration is discharged in backwash draining to backwash.Backwash blowoff basin is collected The backwash draining of I and II BAF and recycling tank drain.Supernatant is sent by water decanter to intermediate pool or buffering pond, dense Contracting sludge is pumped to storage basin by spoil disposal.

Sodium hypochlorite fungicide is added to waste water execution sterilizing processing becoming hole distributing channel head.Waste water is through becoming hole After filter processing, fine particle and suspended matter in water are further removed.Water outlet enters reuse pool.Influent quality When preferable, reuse pool can be directly entered through surmounting pipeline by becoming hole filtering pool water inlet.It collects and becomes hole filtering pool production water, I and II BAF productions water (surmount and become hole filtering pool), Treated sewage reusing water process is sent into after the pressurization of reuse water pump.

Reuse pool part water also as the flushing water of vacuum belt dewaterer, flocculant chemicals dosing plant with medicinal water, Biological aerated filter and the anti-scouring water for becoming hole filtering pool.

The residue of sedimentation basin discharge is burnt to be beaten with coke discharging pump to vacuum hydroextractor dehydration, the flushing waste water of vacuum hydroextractor and Filtrate from buffered water pond is flow to, periodically transport outward by dewatered coke powder.

Waste water after advanced treating：Ammonia nitrogen concentration：2~5mg/L；CODcr：60~80mg/L.

(4) Treated sewage reusing

The waste water handled through step (3) is sent into immersion ultrafiltration apparatus and carries out ultrafiltration, a part of conduct of ultra-filtration water The moisturizing reuse of turbid circulating water, another part carry out reverse osmosis deaslination, collect reverse osmosis produced water and reverse osmosis concentrated water；It is reverse osmosis produced Water fills into plant area's synthesis pond as raw water, for motorization length of schooling water and Craft in Chemical Industrial Area water；It is as follows：

Advanced treating section, which is discharged to produce after water mixes adjusting pH value with more medium filter, enters well strainer, goes in water removal The suspended contamination of grain size >=0.5mm enters immersed ultrafiltration membrane pond distributing channel, subsequently into leaching by the water of well strainer Do not have formula ultrafiltration membrane pool (aperture of ultrafiltration membrane is 0.04 μm, and material is Kynoar PVDF), after immersion ultra-filtration filters Water outlet enter ultrafiltration pond, partly by outside ultrafiltration water supply pump pressurization be sent to turbid circulating water system as supplement water, remainder Cartridge filter is sent into after being pressurizeed by reverse osmosis feedwater pump, cartridge filter water outlet enters reverse osmosis unit after high-pressure pump pressurizes Processing (reverse osmosis membrane retains the organic matter of dissolving salt and molecular weight more than 100, and material is aromatic polyamide), counter-infiltration system The salt in water is removed, produces water salt content：30~100mg/L, production water enters behind reverse osmosis pond to be sent again by the pressurization of reuse water pump Pond, hyperfiltration reverse-rinsing draining and trench wastewater collection are integrated to backwash waste collecting pit toward plant area, are beaten by pump to efficient clarification Pond is handled, and by adding PAC flocculants, PAM flocculation aids, precipitates the suspended matter in waste water, and precipitating sludge drains into storage basin, by Sludge pump is beaten to organic sewage treating system belt filter press and is carried out dehydrating.High efficiency clarification tank water outlet gravity flow enters primary water Pond is lifted into more medium filter by filter intake pump and is further processed, and water outlet and organic sewage treating system water outlet are mixed Enter well strainer after conjunction.More medium filter backwash water uses ultrafiltered product water, and backwash waste drains into backwash waste collection Pond.

The accident drainage collection of reverse osmosis concentrated water, chemical cleaning waste liquid and backwash waste collecting pit leads to outer blowoff basin Outer draining pump is crossed to send outside to strong brine processing unit.

Treated sewage reusing reverse osmosis produced water salt content：30~100mg/L；CODcr：2~5mg/L；Ammonia nitrogen concentration：3~5mg/ L。

(5) strong brine film concentrates

5-1) Treated sewage reusing reverse osmosis concentrated water and the concentration of turbid circulating water blowdown moisture film：

Machine is sequentially sent to after reverse osmosis concentrated water in step (4) is mixed homogeneous in regulating reservoir with turbid circulatory system sewerage Tool accelerating purifying pool, become hole filtering pool, clarification pond and self-cleaning filter in, then by self-cleaning filter water outlet successively into Nanofiltration production water and nanofiltration concentrated water are collected in row ultrafiltration and nanofiltration；By nanofiltration production water carry out reverse osmosis deaslination, collect reverse osmosis produced water and Reverse osmosis concentrated water；Reverse osmosis concentrated water is subjected to concentrated water reverse osmosis deaslination, collects concentrated water reverse osmosis concentrated water and concentrated water reverse osmosis produced water； Reverse osmosis produced water and concentrated water reverse osmosis produced water send chemistry water as raw water；It is as follows：

Two strands of water of Treated sewage reusing section reverse osmosis concentrated water and turbid circulatory system sewerage are after pond is uniformly mixed after the adjustment, through point Not Jia Ru MgO, NaOH, PAC, PAM enter mechanical accelerating purifying pool (machine adds clarifying basin), mechanical accelerating purifying pool Disengagement zone reality The separation of existing body refuse and water, body refuse natural sedimentation to mechanical accelerating purifying pool bottom, the water after separation is by pipe-line mixer, acid Reaction tank is further clarified to hole filter, water is become, and substantially reduces the turbidity in water, and production water is collected into primary water Pond.The flushing water of mechanical accelerating purifying pool is provided by the pretreatment flushing pump for clarifying pond, becomes the backwash water of hole filtering pool by clear The filter tank backwashing pump of clear water reserviors provides.

Water in clarification pond, which is sent through the promotion of ultrafiltration water supply pump to self-cleaning filter, removes suspended particulate, the water after filtering Three groups of ultrafiltration apparatus (aperture of ultrafiltration membrane is 0.03 μm, and material is Kynoar PVDF) are respectively enterd, are discharged SDI≤3, it is turbid Degree≤0.2NTU is to ultrafiltration pond.Ultrafiltration production water supply nanofiltration device, which is further processed to backwash with ultrafiltration, to be used.

The backwashing water return regulating reservoir for becoming hole filtering pool, self-cleaning filter and ultrafiltration apparatus is handled again.

Water in ultrafiltration production pond is pumped out by nanofiltration water supply, adds corresponding medicament (hydrochloric acid, sodium hypochlorite, sulfurous acid Hydrogen sodium, antisludging agent) after, into nanofiltration cartridge filter, to go remaining particulate matter in water removal.Water outlet is by nanofiltration high pressure After pump supercharging, into nanofiltration device.Nanofiltration includes 3 covering devices, and it is level-one three-stage structure often to cover nanofiltration device, and the water inlet of third section is set It is equipped with inter-section booster.Nanofiltration production water is collected to nanofiltration pond, and pressurization is sent to reverse osmosis unit, and nanofiltration concentrated water is collected to concentrated water Pond.

After reverse osmosis unit water inlet adds RO antisludging agents, into RO cartridge filters, it is discharged after the supercharging of RO high-pressure pumps, Into level-one RO film devices (reverse osmosis membrane retains the organic matter of dissolving salt and molecular weight more than 100, and material is PA membrane).One Grade is reverse osmosis including 3 covering devices, and per two segment structure of covering device level-one, second segment is provided with inter-section booster.RO production water collect to Reverse osmosis pond, RO concentrated waters are collected to concentrated water intermediate pool.After RO concentrated waters add RO antisludging agents, ensure public security and filter into concentrated water RO Device is discharged after the supercharging of concentrated water RO high-pressure pumps, and into two level RO film devices, (reverse osmosis membrane retains dissolving salt and molecular weight is more than 100 organic matter, material are PA membrane).Two-pass reverse osmosis only has 1 covering device, two segment structure of level-one, and second segment is provided with section Between booster pump.RO production water is collected to reverse osmosis pond, by pumping power-section production pond of externally supplying water.RO concentrated waters and nanofiltration (NF) Concentrated water is sent to multi-effect evaporating device after being mixed in concentrated water pond.RO production water power is led：420~1000us/cm；CODcr：2~5mg/L； Ammonia nitrogen concentration：2~5mg/L.Concentrated water RO production water power is led：1000~1500us/cm；CODcr：5~10mg/L；Ammonia nitrogen concentration：2~ 5mg/L。

It is the unqualified water of ultrafiltration apparatus and ultrafiltration pond emptied of water, the unqualified water of nanofiltration device and nanofiltration pond emptied of water, anti- It is infiltration and concentrated water reverse osmosis unit emptied of water, concentrated water intermediate pool emptied of water, reverse osmosis pond and concentrated water collecting pit emptied of water, clear It washes wastewater collection pond emptied of water and removes outer blowoff basin, by outer draining pumping organic sewage processing post accident pool.

The backwash water of ultrafiltration apparatus is pumped by the hyperfiltration reverse-rinsing in ultrafiltration pond and provided, nanofiltration device and reverse osmosis unit flushing water It is provided by the reverse osmosis flush water pump of the nanofiltration in reverse osmosis pond.

Ultrafiltration apparatus carries out chemical cleaning by ultrafiltration CIP devices, and nanofiltration device and reverse osmosis unit are by nanofiltration/reverse osmosis CIP devices carry out chemical cleaning, and waste liquid after cleaning is to cleaning wastewater collection pond.

5-2) acidic and alkaline waste water film concentrates

Chemistry water acidic and alkaline waste water and Ion exchange resin acidic and alkaline waste water are sequentially sent to the (regeneration of regeneration mechanical accelerating purifying pool Machine adds clarifying basin) and change hole filtering pool；The water outlet of change hole filtering pool is carried out ultrafiltration and regenerates reverse osmosis, collection regeneration reverse osmosis successively Production water and regeneration reverse osmosis concentrated water thoroughly；Reverse osmosis concentrated water is sequentially sent to vibration clarifying basin (mechanical accelerating purifying pool), vibration filter (becoming hole filtering pool) carries out nanofiltration afterwards in pond, collects nanofiltration production water and nanofiltration concentrated water；Nanofiltration concentrated water is sent into vibration film device, is collected Vibrating membrane produces water and vibrating membrane concentrated water；Water is produced into nanofiltration and vibrating membrane production water carries out vibrating together reverse osmosis, collection vibration reverse osmosis Production water and vibration reverse osmosis concentrated water thoroughly；It regenerates reverse osmosis produced water and the vibration reverse osmosis produced water is sent into chemistry water as raw material Water；It is as follows：

Acidic and alkaline waste water from power-section chemistry water and Craft in Chemical Industrial Area condensate polishing treatment post, initially enters regenerating device and adds Clarifying basin (mechanical accelerating purifying pool) by adding sodium carbonate, sodium hydroxide, PAM coagulant, PAC flocculants, makes regenerative wastewater Middle suspended matter and partial impurities precipitation.Regenerating device adds clarifying basin to be discharged and enters change hole filtering pool, fine particle and suspension in water Object is further removed.Becoming hole filtering pool water outlet, (into 0.03 μm, material is to gather inclined fluorine in the aperture of ultrafiltration membrane into ultrafiltration apparatus Ethylene PVDF), ultrafiltration production water enters regeneration reverse osmosis unit, and (it is organic more than 100 that reverse osmosis membrane retains dissolving salt and molecular weight Object, material are PA membrane), production water enters reverse osmosis produced pond, and concentrated water is after adding medicine, through vibrating clarifying basin (machinery Accelerating purifying pool), vibration filter tank (become hole filtering pool), water outlet enters vibrating membrane pretreatment production pond.

Concentrated water in vibrating membrane pretreatment production pond, into nanofiltration device, (NF membrane can retain after laminated filter Part divalent ion (such as bivalent metal ion：Ca²⁺、Mg²⁺Deng) and molecular weight 200~400 organic matter, material is polyamide Film), by NF membrane selectively retention macromolecular substances, part salt and small-molecule substance enter vibration reverse osmosis through NF membrane Penetrate into water tank.The macromolecular concentrated water being trapped enters vibration film device, and (vibrating membrane retains dissolving salt and molecular weight having more than 100 Machine object, material are PA membrane), due to the continuous effect of vibration of diaphragm, make residual salt and small-molecule substance in waste water, further Permeate likewise enter vibration feed water by reverse osmosis case, be trapped concentrated water and enter concentrated water pond.

It vibrates feed water by reverse osmosis case to collect nanofiltration and vibrate the production water of film device, into vibration reverse osmosis unit, produces water Into reverse osmosis produced water tank.The concentrated water drainage that reverse osmosis and nanofiltration vibrating membrane generates is to multi-effect evaporating device.

Acidic and alkaline waste water film condensing device production water power is led：600~800us/cm；CODcr：2~5mg/L；Ammonia nitrogen concentration：3~ 5mg/L。

(6) multiple-effect evaporation

By step 5-1) in nanofiltration concentrated water, concentrated water reverse osmosis concentrated water and step 5-2) vibrating membrane concentrated water, vibration it is reverse osmosis concentrated Water is sent into multi-effect evaporating device and is evaporated crystallization together, collects evaporation condensate and crystal salt；The evaporation condensate conduct The moisturizing reuse of turbid circulating water, is as follows：

Film concentration systems generate strong brine enter buffer pool storage, mixing tank is promoted to by elevator pump, herein with centrifugation The filtrate mixing of separation process, is pumped by acid adding and adds in 10% dilute sulfuric acid, the pH value of strong brine is controlled between 4~5, by contactor pump It sends out, after III effect condensation water preheater, I effect condensation water preheater two-stage are preheated to 57 DEG C, into degasifier, vacuum stripping is de- Except the gases such as carbon dioxide in solution.

Strong brine after degassed is discharged by degasifier lower part, and a concentration of 5% through static mixer and lye pump conveying NaOH solution mixes, and regulation and control pH value is 8~9, and advection is added in each evaporator after charge pump pressurizes.To prevent heating inside pipe wall Fouling will be formulated as 50% (Wt%) magma by magma pump and add in evaporator, and ensure to recycle magma in feed liquid in evaporator Content is in 20g/l or so.Strong brine acts on cycle in evaporator by what density contrast and circulating pump pressurizeed.Heated room heating Strong brine afterwards enters vaporization chamber, is evaporated, concentrates herein, and the slurry after concentration is discharged into next effect successively, finally in III effect It is crystallized in vaporization chamber, crystal drains into dehydration procedure by discharge pump.

The low-pressure steam that pressure is 0.5MPa, temperature is 158 DEG C enters steam jet ejector, and I effect vaporization chamber of recycling generates Part indirect steam enters I effect after steam jet ejector outlet mixing and heats room shell side, is condensed in I effect heating room shell side, cold Condensate flows into I effect condensate draining from I effect heating room lower part.Condensed water in I effect condensate draining flows into I effect condensed water by pressure difference Shwoot slot, the steam that shwoot generates enter II effect and heat room；Condensed water after shwoot is pumped to I effect condensed water by I effect condensed water Preheater enters condensed water reservoir after carrying out heat exchange with strong brine.

The indirect steam part that I effect vaporization chamber generates is back to steam emitter, and another part enters II effect and heats room shell The strong brine recycled in journey heating evaporation tank；Steam condenses after the II indoor heat exchange of effect heating, and condensed water flows into second condensed water Slot flows into III effect condensate draining under the action of pressure difference.

The indirect steam that II effect vaporization chamber generates enters III effect and heats room shell side, condenses, condenses after the indoor heat exchange of heating Water flow into III effect condensate draining, by second condensed water slot come condensed water by shwoot, shwoot vapour enter triple effect heat room.III effect is cold Condensation by mixing water in condensate slot is pumped to III effect condensation water preheater by III effect condensed water, and the condensed water after cooling enters Condensed water reservoir.Condensed water in condensed water reservoir is pumped out by condensed water conveying, qualified condensation water to turbid circulating water system, Underproof condensed water auto switching is to buffering pond.To ensure condensate quality, set on I, II effect separator secondary steam pipe There is demister and equipped with timing flusher, it is primary per 30s auto-flushings；Condensed water sends pipeline outside equipped with conductivity on-line checking Device, can the automatic switchover of root Ju situation.

The indirect steam that III effect vaporization chamber generates enters barometric condenser, with the circulating cooling from turbid circulating water system Water is in direct contact condensation, so as to form certain vacuum degree.Each effect heats indoor on-condensable gas and is discharged into next effect successively Room is heated, tail effect fixed gas is discharged into barometric condenser, is finally extracted out by airless injection system.

The slurry discharged by discharge pump is sent to cyclone, and the slurry after cyclone concentrates enters centrifuge, cyclone top Liquid back-mixing charging basket, solid filter residue drain into salt slurry feed bin entrucking outward transport；The filtrate of centrifuge flows into filtrate tank, is pumped to by filtrate mixed Charging basket.

Multi-effect evaporating device produces water conductivity：100~300us/cm.

Claims

1. a kind of coal chemical industry wastewater zero emission treatment method, includes the following steps：

(1) gas liquor separation and phenol recovery ammonia：By crushed coal pressure gasifying generate gas liquor be sent into coal gas water separation device in into Row degassing, dedusting, recycling tar, middle oil and dust-laden tar, are then fed into phenol ammonia recovery unit and recycle ammonia and crude phenols, take off simultaneously Except solution gas；

(2) biochemical treatment：Sanitary sewage, initial rainwater and chemical examination waste water are sent into the floating material in grid canal removal waste water；It will The water outlet of grid canal enters the grease in oil partiting precipitation pool removing waste water together with methanol waste water, accident waste water；

The waste water handled through step (1) and oil partiting precipitation pool water outlet are sent into comprehensive adjustment pond together and carry out water quality and quantity adjusting； The water outlet of comprehensive adjustment pond is sequentially sent to carry out biochemical treatment in anaerobic hydrolysis acidification tank, A/O ponds and secondary settling tank, collects secondary settling tank Supernatant；

(3) advanced treating：It will be sent into activated coke adsorption tank through second pond supernatant described in step (2) and carry out adsorption treatment, Obtain burnt aqueous mixtures；The burnt aqueous mixtures are subjected to flocculation sediment processing, collect supernatant；The supernatant is sent into and is aerated Biological membrane degradation, filtration treatment are carried out in biofilter；

(4) Treated sewage reusing：The waste water handled through step (3) is sent into immersion ultrafiltration apparatus and carries out ultrafiltration, ultra-filtration water one Moisturizing reuse of the part as turbid circulating water, another part carry out reverse osmosis deaslination, collect reverse osmosis produced water and reverse osmosis concentrated water； The reverse osmosis produced water fills into plant area's former pond as raw water；

(5) strong brine film concentrates：

5-1) Treated sewage reusing reverse osmosis concentrated water and the concentration of turbid circulating water blowdown moisture film：By reverse osmosis concentrated water described in step (4) with Turbid circulating water system sewerage is sequentially sent to mechanical accelerating purifying pool after homogeneous is mixed in regulating reservoir, becomes hole filtering pool, clarification In pond and self-cleaning filter, self-cleaning filter water outlet is then subjected to ultrafiltration and nanofiltration successively, collect nanofiltration production water and Nanofiltration concentrated water；Nanofiltration production water is subjected to reverse osmosis deaslination, collects reverse osmosis produced water and reverse osmosis concentrated water；It will be described reverse osmosis Concentrated water carries out concentrated water reverse osmosis deaslination, collects concentrated water reverse osmosis concentrated water and concentrated water reverse osmosis produced water；The reverse osmosis produced water and institute It states concentrated water reverse osmosis produced water and fills into plant area's former pond as raw water；

5-2) acidic and alkaline waste water film concentrates:Chemistry water acidic and alkaline waste water and Ion exchange resin acidic and alkaline waste water are sequentially sent to mechanical acceleration Clarifying basin and change hole filtering pool；Hole filtering pool water outlet will be become, and progress ultrafiltration and regeneration are reverse osmosis successively, and it is reverse osmosis produced to collect regeneration Water and regeneration reverse osmosis concentrated water；The reverse osmosis concentrated water is sequentially sent to mechanical accelerating purifying pool and is received after becoming hole filtering pool Nanofiltration production water and nanofiltration concentrated water are collected in filter；The nanofiltration concentrated water is sent into vibration film device, collects vibrating membrane production water and vibrating membrane Concentrated water；Water is produced into the nanofiltration and vibrating membrane production water carries out vibrating together reverse osmosis, collects vibration and reverse osmosis produced water and shakes Dynamic reverse osmosis concentrated water；The regeneration reverse osmosis produced water and the vibration reverse osmosis produced water fill into plant area's former pond as raw water；

(6) multiple-effect evaporation：By step 5-1) described in nanofiltration concentrated water, the concentrated water reverse osmosis concentrated water, step 5-2) described in shake Dynamic film concentrated water, the vibration reverse osmosis concentrated water are sent into multi-effect evaporating device and are evaporated crystallization together, collect evaporation condensate with Crystal salt；Moisturizing reuse of the evaporation condensate as turbid circulating water.

2. according to the method described in claim 1, it is characterized in that：In step (2), the anaerobic hydrolysis acidification tank uses UASB Structure type.

3. method according to claim 1 or 2, it is characterised in that：In step (2), the A/O ponds are Prepositive denitrification.

4. method according to any one of claim 1-3, it is characterised in that：In step (3), the second pond supernatant It is further included before the activated coke adsorption tank is sent by the second pond supernatant, activated coke filter press filtrate and flushing water one Act the step be sent into and be uniformly mixed in buffering pond.

5. according to the described method of any one of claim 1-4, it is characterised in that：In step (3), the grain size of the activated coke It it is 74~280 μm, heap density is 450~650Kg/m³, specific surface area is 200~300m²/g。

6. method according to any one of claims 1-5, it is characterised in that：In step (3), the supernatant successively into It may also include before entering biological aerated filter and the supernatant and sanitary sewage, methanol waste water be sent into intermediate pool together and stirred Mix uniform step；And/or

Any one of the feeding biological aerated filter is following 1) -2)：

1) only it is sent into level-one biological aerated filter；

2) level-one biological aerated filter and two level biological aerated filter are sequentially sent to.

7. according to the method described in any one of claim 1-6, it is characterised in that：In step (4), the immersion ultrafiltration dress The aperture for putting middle ultrafiltration membrane is 0.01~0.05 μm；Material is any in makrolon, polyvinyl chloride and Kynoar； And/or

Reverse osmosis membrane retention dissolving salt and molecular weight are more than 100 organic matter used by the reverse osmosis deaslination, and material is vinegar Acid cellulose, aromatic polyamide it is any.

8. according to the described method of any one of claim 1-7, it is characterised in that：Step 5-1) in,

For 0.01~0.05 μm, material is makrolon, polyvinyl chloride and gathers inclined fluorine in the aperture for the ultrafiltration membrane that the ultrafiltration uses It is any in ethylene；

The organic matter of NF membrane retention divalent ion and molecular weight 200~400 used by the nanofiltration, material is acetate fiber It is any in element, aromatic polyamide；

9. according to the method described in any one of claim 1-8, it is characterised in that：Step 5-2) in,

Reverse osmosis membrane retention dissolving salt and molecular weight are more than 100 organic matter used by the regeneration is reverse osmosis, and material is vinegar Acid cellulose, aromatic polyamide it is any；

Vibrating membrane retention dissolving salt and molecular weight employed in the vibration film device are more than 100 organic matter, and material is vinegar Acid cellulose, aromatic polyamide it is any, vibration frequency be 50~60HZ；

Reverse osmosis membrane retention dissolving salt and molecular weight are more than 100 organic matter used by the vibration is reverse osmosis, and material is vinegar Acid cellulose, aromatic polyamide it is any.

10. according to the method described in any one of claim 1-9, it is characterised in that：In step (6), the multiple-effect evaporation dress It is set to triple effect evaporation evaporator.