CN207391133U - A kind of new grease factory refining wastewater pre-processing device - Google Patents

Abstract

The utility model discloses a kind of new grease factory refining wastewater pre-processing device, including be connected in turn inlet channel, reaction zone (dosing mixing pit, first-level alkali adding area, two level add alkali area), Chu Chen areas, Jing Chen areas.Electromagnetic flowmeter, phosphate on-line detector are set on inlet channel, dosing mixing pit peripheral hardware magnesium salts throwing device, ammonium salt throwing device, I and II adds alkali area peripheral hardware liquid caustic soda throwing device, the three-level of reaction zone is all provided with mixer, online pH meter, Chu Chen areas set mixer, and Jing Chen areas set mud scraper, Slag Scraping Device, mud cylinder is led at center, annular receives mill weir.The equipment application using magnesium salts, ammonium salt medicament, while achievees the effect that oil removing, COD, TP and abolishes emulsified state in the pretreatment of the refining wastewater of grease factory high phosphorus.The removal rate of COD, TP are more than 90%, compared with traditional handicraft distinguish it is high by 30%, 50%, sludge yield reduces more than 70% than traditional coagulating sedimentation.The sludge of generation is easily dehydrated, without poisonous and hazardous heavy metal, environmental sound.

Description

A kind of new grease factory refining wastewater pre-processing device

Technical field

The utility model belongs to field of waste water treatment, is related to a kind of new setting applied to the refining wastewater pretreatment of grease factory It is standby, by the unit equipment, the pollutants such as efficient COD, phosphorus and the grease removed in grease factory refining wastewater can be disposably completed, And its emulsified state is abolished, mitigate the pressure of subsequent processing process.

Background technology

1st, China's oil-fat plant present situation

With the fast development of China's economy and the continuous improvement of Living consumption, the edible oil demand in China is continuous Increase, vegetable oil processing enterprise also rapidly develops.According to statistics, the output of China's vegetable fat is with annual 5%~6% speed It is skyrocketed through, vegetable fat total output in China's has been sure to occupy No. 1 in the world at present, becomes the important vegetable fat production in the world and disappears Take state [1].The statistics and relevant information provided according to State Grain Administration and Grain in China employer's organization, 2010, the whole nation Ru Tong edible vegetable oils processing enterprise 11468 handles oil plant ability edible vegetable oil processing industry year as 13111.1 ten thousand tons, oil Fat affinability is 3972.5 ten thousand tons [2], and [3] are calculated according to every production 1t vegetable oil discharge 0.6~6t waste water skill, domestic every The vegetable fat production waste water quantity that year generates is considerable.

2nd, the source of fats and oils processing enterprise wastewater and water quality characteristics

The common edible vegetable oil production technology (exemplified by soybean) in China is to leach legal system crude oil, chemical refining legal system at present Take refined oil.Substantial amounts of waste water can be generated in production process of vegetable oil：The leaching waste water that leaching workshop generates, which mainly contains, to be waved Hair property aliphatic acid, a small amount of phosphatide and other greases；In refining plant, the refining wastewater that is generated in the refining process of crude oil, master The pollutant wanted is the oil foot, phosphoric acid and the neutral oil that generate in scouring processes, soap stock, neutral oil, the glue generated in alkali refining process Matter etc..Refining wastewater pollutant concentration is high, pollutant component is complicated, intractability is big, and appearance is creamy white or milk yellow, height It is not stratified to stand a couple of days for emulsification.General oil-containing 500mg/L~2000mg/L, COD is 8000mg/L~20000mg/L, and TP is 400mg/L~900mg/L.

3rd, existing grease factory wastewater processing technology

Refining wastewater is very big with leaching the difference such as waste water, sanitary wastewater, and processing method and technique also differ.General oil Fat processing factory by pretreatment, will remove most oil, phosphorus and partial organic substances after refining wastewater elder generation collection storage, then with leaching Go out waste water, sanitary wastewater merges progress biochemical treatment.For refining wastewater, the common pretreatment work of China's oil-fat plant at present Skill is " coagulation+precipitation/air supporting " and " adding sulfuric acid relieving haperacidity oil+lime demulsification+precipitation/air supporting "." coagulation+precipitation/air supporting " adds Coagulant (generally polymeric ferric salt or polyaluminium salts), under certain pH value, with larger molecular organics, the long-chain in refining wastewater Coagulating occurs for soap, oil etc., agglomerates and precipitates for bulky grain from water, so that the emulsified state stablized originally It is broken.Coagulant can react the corresponding calcium phosphate precipitation of generation with the phosphate radical in waste water simultaneously.It is heavy to take afterwards It forms sediment or pneumatically supported mode removes sediment and preprocessing process can be completed." adding sulfuric acid relieving haperacidity oil+lime demulsification+precipitation/air supporting " Be directed to add in a certain amount of concentrated sulfuric acid in refining wastewater, in waste water sodium soap reaction generation aliphatic acid, aliphatic acid with After glycerine, water separation, then lime slurry is added in into waste water, it is antacid while phosphorus can be generated with the phosphate reaction in waste water Sour calcium precipitate simultaneously abolishes emulsification state, then will be precipitated and removed by precipitation or air supporting.

4th, at present common treatment process there are the problem of

Above two traditional handicraft can all abolish the emulsified state of refining wastewater, and reach dephosphorization and organics removal (COD) purpose, however, the phosphorus content of refining wastewater often reaches 400~900mg/L.And as previously mentioned, Coagulation Method and relieving haperacidity Oil process, usually using aluminium salt, molysite, calcium salt (Ca (OH) 2) etc., under suitable pH value with PO₄ ^3-The generation that reacts is corresponding Phosphate indissoluble object and form precipitation in water, achieve the effect that dephosphorization.And the usual volume of these sediments is larger, sludge volume Up to 50~80%, and sludge specific resistance value is larger, it is difficult to be dehydrated, body refuse is without utility value, disposal difficulty after dehydration.Add sulfuric acid system It is needed in sour oil technique using the concentrated sulfuric acid, transport stores, is higher using process hazard, and the sediment volume generated is huge Greatly, sludge dewatering operation labor intensity is big, environmental sanitation is severe.

According to sewage drainage standard to requirements such as COD, TP, the effect of refining wastewater pretreatment is directly related to enterprise wastewater The success or failure of qualified discharge.The sludge treatment problem generated in refining wastewater preprocessing process is also increasingly serious.In short, increasingly Under tight discharge standard requirement and supervision, traditional refining wastewater pretreating process there is it is larger the drawbacks of：1. dephosphorization is demulsified Rate is low.Only in the case where largely using medicament, higher efficiency could be obtained；2. sludge yield is big.Due to the throwing of medicament Dosage is big, can generate substantial amounts of sludge, and the chemical sludge generated mixes grease, organic matter, and sludge specific resistance is big, and dehydration is tired Difficulty, and severe operational environment, labor strength are big.

5th, the existing patented technology in the field

Have some patented technologies currently for the wastewater treatment of oil-fat plant, being summed up mainly there are four classes：

1. extraordinary microbial bacterial agent carries out biological treatment [4~7]；

2. coagulating treatment, the coagulant used has calcium hydroxide [8]；It polymerize aluminum oxychloride/polychloride ferro-aluminum [9]；Activity Carbon dust, magnesium silicate powders [10]；

3. air supporting/precipitation+anaerobism+Aerobic Process for Treatment [11,12]；

4. it filters：Micro-filtrate membrane filtration [13]；Shell chaff filtering+plant ash filtering [14]；Inorganic ceramic membrane filtration [15].

In above-mentioned technology, extraordinary microbial bacterial agent needs special screening, culture, and working condition requirement is tight in engineer application Lattice, and treated the problem of waste water still suffers from dephosphorization；Coagulating treatment and traditional preconditioning technique there are it is identical the problem of； " air supporting/precipitation+anaerobism+Aerobic Process for Treatment " is to first pass through simple pretreatment to carry out Multilevel biochemistry treatment again, also still exists and removes The problem of phosphorus；For the refining wastewater of the high oil height emulsification of high phosphorus, with embrane method filtration treatment, it is necessary to which film service life is overcome not grow And cost it is higher the problem of, and it is difficult to handle concentrated water disposal.

6th, this patent solves the problems, such as

The novel process equipment that the utility model is just specific to the pretreatment of refining wastewater and develops.In view of in work Operability and feasibility in Cheng Yingyong, the principle of the utility model remains physico-chemical process pretreatment, but the medicament used is magnesium Salt, ammonium salt, it is insoluble that both medicaments can react generation ammonium magnesium phosphate with the phosphate radical of Coal Gas Washing Cycling Water under certain pH value Phosphorus From Wastewater concentration is greatly lowered in object, and can remove most oil, organic matter simultaneously, and makes the emulsified state of waste water It abolishes, shows the more clear supernatant in top, subsequent biochemical can be entered after precipitation and reacted.Ammoniomagnesium phosphate crystal precipitates Object is compared to precipitating sludges such as ferric phosphate, aluminum phosphate, calcium phosphate, volume smaller, sinking speed faster, and due to ammonium magnesium phosphate bone After the effect of frame, attaching oil and other organic matters, still very little, sludge are easily dehydrated sludge specific resistance.It, can be once using the present apparatus Property efficient removal of the completion to COD, TP in refining wastewater, and eliminate the emulsified state of waste water simultaneously, be subsequent waste water Mixed processing creates good condition.

Bibliography：

1. Guo is state-run, Xie Hong vegetable fat technique for treating industrial wastewater research [J] environmental protection forum, and 2009,9：380- 382.

2. Chinese food science and technology net

3. Liu's essence is modern, Chen Zhuxin, Yang Qi China vegetable oil wastewater conventional biological treatment Research progress China oil Fat, 2004, (03)

4.CN104845905A, it is a kind of remove the COD containing salad oil wastewater high efficiency composition microbial inoculum and its using

5.CN10577673A to the method for soybean oil waste water emulsification oil processing

6.CN105693043A soybean oil waste water processing and the method for recycling

7.CN101074136A a kind for the treatment of process of highly concentrated oil-bearing wastewater

8.CN105967458A a kind of sewage water treatment method in soybean oil production

9.CN106145331A a kind of method of quick processing edible fat production sewage

10.CN103435186A a kind of processing method containing oil wastewater

11.CN101302071A method for processing palm oil waste water and application thereof

12.CN205856249U a kind of Fat wastewater treatment device

13.CN1752028A the processing method of edible regetable oil and fat processing waste water

14.CN104496059A a kind of edible oil factory production sewage treatment technique

15.CN105731713A Fat wastewater treatment device and its processing method

Utility model content

To solve the problems, such as that the utility model provides a kind of new pretreatment present in existing refining wastewater pretreatment Equipment.The equipment includes the reaction zone being connected in turn, preliminary sedimentation area, Jing Chen areas, after the sludge of generation is discharged into storage basin Mechanical dehydration is carried out, the water outlet in Jing Chen areas enters subsequent processing facility.Set on the equipment inlet channel electromagnetic flowmeter, Online total-phosphorus detection instrument, is located at line pH meter, peripheral hardware magnesium salts, ammonium salt, liquid caustic soda dosing system in the crystallization reaction area.

The utility model gathers together reaction tank, sedimentation basin, saves equipment and pipeline, pattern are flexible, easy for installation. Whole equipment structure can be steel reinforced concrete pool or carbon steel anticorrosion structure.It is a kind of new unit combining form.

The structure of the reaction zone of the utility model is " mesh font ", and reaction tank is divided into three-level by midfeather, and level-one is to add Medicine mixing pit, two, three-level for plus alkali area (since refining wastewater pH value is usually 4~5, to adjust pH value to alkalescence, thus need Add alkali), there is water hole to connect three-level at 10cm under liquid level on partition wall, mixer is all provided at the top of three-level pond body.In crystallization reaction area The third level adds two kinds of pipelines having on one end pool wall in alkali area positioned at different height, is followed successively by from high to low：Overflow pipe, draining Pipe, three-level pool bottom are all provided with evacuated tube, enter storage basin after importing main pipe.The crystallization reaction pond method of operation is continuous operation, HRT=30~60min.

The utility model contains two-stage settling zone --- and preliminary sedimentation and essence are sunk.Due to the high high COD high of oil of grease factory refining wastewater The characteristic of phosphorus can generate substantial amounts of ammonium magnesium phosphate crystal in reaction zone, be mixed with grease and other organic matters precipitation, and sludge is sticky And density is big, and two-stage is set to precipitate and can effectively avoid damage of the thick sludge to mud scraper.The setting in preliminary sedimentation area, first by a part Mud mixture is discharged, and is entered back into Jing Chen areas and is precipitated, and the less water of the suspension content after mud-water separation is discharged into next stage Biochemical treatment.

The preliminary sedimentation area of the utility model is circular cone bottom structure, and one side is co-walled with reaction zone, and opposite side is adjacent with Jing Chen areas. The cone base angle degree in preliminary sedimentation area is larger, is slid convenient for highdensity sludge to cone bottom, cone bottom bottom is flat receipts mud groove, inside sets stirring Device, long low stirring prevent that crystallization sludge is hardened.

The Jing Chen areas of the utility model are circular cone bottom structure, are typical radial-flow type sedimentation pool structure.It is inside equipped with and scrapes Mud machine, top is equipped with scum board, annular receives mill weir, is separately equipped with central tube.

The medicament that the reaction zone of the utility model adds in is soluble magnesium salts and ammonium salt, is different from aluminium salt, molysite, calcium salt And traditional coagulant such as poly-aluminium salt, Polyferric Sulfate salt, the pretreatment to still belong to the first time applied to grease factory waste water.Both extraordinary medicines The use of agent, while have the function that remove COD, TP and abolish emulsified state.

Traditional Coagulation Method pretreatment mainly by adding in coagulant, makes oil slick, emulsification state oil, aliphatic acid in waste water Or sodium soap (soda soap), the soluble pollutants such as nonglyceride and suspended impurity take off steady and generate small aggregation, and in height Big floccule body is further agglomerated under the action of molecular flocculant, removes floccule body in conjunction with air supporting or precipitation.It is and traditional The pretreatment of relieving haperacidity oil process, then the sodium soap of high concentration in waste water is made to generate fat by adding in the concentrated sulfuric acid into refining wastewater Fat acid, acidifying can not only be made aliphatic acid, be also demulsified to the waste water of this height emulsification.But the pH value of waste water is significantly It reduces, domestic common practice is to add in lime to recover pH value and play the role of dephosphorization.With traditional Coagulation Method demulsification and The device that relieving haperacidity oil demulsification method etc. is usually used in grease factory Wastewater Pretreatment is compared, and the utility model utilizes highly concentrated present in waste water The phosphate of degree uses new medicament：Magnesium salts and ammonium salt make it react with phosphate and generate ammonium magnesium phosphate, in this process In, the organic matters such as oil emulsion in waste water, phosphatide, aliphatic acid or sodium soap (soda soap), protein are trapped, break the breast of waste water Change state and realize the effect of demulsification, while phosphate transfection is moved in precipitation, plays the effect of dephosphorization.Reaction principle is not Together, determine that the utility model greatly reduces the dosage of medicament, simplify process flow, enhance the safety of processing procedure Property and controllability.After reaction condition is reached, reaction process is very fast, substantially increases treatment effeciency.

It can be by the essence of COD concentration 8000mg/L~15000mg/L, 100mg/L ＜ TP ＜ 900mg/L using the utility model The removal rate for refining wastewater treatment to water outlet COD ＜ 3000mg/L, TP ＜ 10mg/L, COD, TP is more than 90%, COD removal rates relatively biography Uniting, high 30%, the TP removal rates of technique are high compared with traditional handicraft by 50%, and pollutants removal rate is significantly higher than traditional handicraft, sludge yield ratio Traditional coagulating sedimentation reduces more than 70%.Follow-up routine biochemistry processing is carried out again can reach corresponding emission request.And this The sludge that utility model generates easily is dehydrated, and is effectively reduced the workload and working strength of operating personnel.Meanwhile the dirt of generation Mud is free of poisonous and hazardous heavy metal, environmental sound.

The utility model breach due to waste water from height oil height emulsification dosage caused by materializing strategy process it is high, Processing procedure be difficult to control and waste water in high concentration phosphorus be difficult to the bottleneck of efficient process, which gets over for containing phosphorus concentration High refining wastewater, treatment effect is better, and COD concentration requirements are wide in range, and processing capacity is strong, efficient, and processing effluent quality is very big Improve, mitigate subsequent processing burden, sludge output is small, and secondary pollution is small caused by environment, and the equipment flowsheet is simple, reduces investment outlay And operating cost.

Description of the drawings

The organigram of the grease factory Wastewater Pretreatment equipment of Fig. 1 the utility model

The floor map of the grease factory Wastewater Pretreatment equipment of Fig. 2 the utility model

Fig. 3 utility model processing vegetable oil high phosphorus refining wastewater example Inlet and outlet water COD values

Fig. 4 utility model processing vegetable oil high phosphorus refining wastewater example Inlet and outlet water TP values

In figure：1. dosing mixing pit, 2. first-level alkali adding areas, 3. two levels add alkali area, 4. Chu Chen areas, 5. Jing Chen areas, 6. electromagnetism Flowmeter, 7. phosphate on-line detectors, 8. magnesium salts dosing systems, 9. ammonium salt dosing systems, 10. liquid caustic soda dosing systems, 11.12.13.17. mud cylinder, 20. Slag Scraping Devices, 21. annulars are led in mixer, the online pH meters of 14.15.16,18. mud scrapers, 19. centers Receive mill weir, 22. water inlet manifolds, 23.25. evacuated tubes, 26. spoil disposal main pipes, 24.27.29. drainpipes, 28. overflow pipes, 30. water outlets Pipe.

Specific embodiment

The construction of grease factory high phosphorus Wastewater Pretreatment equipment provided by the utility model is described in detail below in conjunction with the accompanying drawings.

The construction of the utility model is as shown in Figure 1, the reaction zone including being connected in turn --- dosing mixing pit 1, First-level alkali adding area 2, two level add alkali area 3, Chu Chen areas 4, Jing Chen areas 5.Electromagnetic flowmeter is installed on the reaction zone water inlet pipe 6th, phosphate on-line detector 7, the 1 peripheral hardware magnesium salts dosing system 8 of dosing mixing pit, ammonium salt dosing system 9, described one Ji Jiajian areas 2, two level add 3 peripheral hardware liquid caustic soda dosing system 10 of alkali area, three ponds be all provided with mixer 11,12,13, online pH meter 14, 15th, 16, the Chu Chen areas 4 are interior to install mixer 17, sets mud scraper 18 in the Jing Chen areas 5, mud cylinder 19, Slag Scraping Device are led in center 20th, annular receives mill weir 21.

Plant area's refining wastewater is through water inlet manifold 22 into dosing mixing pit 1, and water outlet is at ullage 10cm.In dosing In mixing pit 1, according to the data that the electromagnetic flowmeter on water inlet manifold 22 and phosphate on-line detector provide, in mixer 11 Stirring under, by a certain percentage add in magnesium salts, ammonium salt.Monitoring medicament and waste water are mixed in real time for online pH meter 14 in the area PH value adds alkali carries to supply data for rear two-stage.

The waste water added in after magnesium salts, ammonium salt enters first-level alkali adding area 2 via the water hole of crossing of 10cm under liquid level or so, and is stirring Under the stirring of machine 12, the liquid caustic soda that concentration is 20% is added in by liquid caustic soda adding equipment 10, adding for liquid caustic soda is controlled by online pH meter 15 System, by pH value control range in first-level alkali adding area：In the range of 7.0 ＜ pH ＜ 7.5.After first-level alkali adding, waste water is via liquid level The water hole excessively of lower 10cm or so enters two level and adds alkali area 3, under the stirring of mixer 13, is added in by liquid caustic soda adding equipment 10 dense The liquid caustic soda for 20% is spent, adding for liquid caustic soda is controlled by online pH meter 16, in two level plus alkali area, pH value control range：8.0 ＜ pH ＜ 8.5.Two-stage is set to add alkali that can prevent pH value from having the phenomenon that falling during rising, it is ensured that final pH value is 8.5 or so.Knot Three pond body ponds of brilliant reaction zone hold identical, HRT=30~60min.

All chemical feed pipe nozzles of reaction zone are located at away from liquid level about more than 10cm.The dosage of magnesium salts, ammonium salt：According to adjusting The phosphatic concentration measured in pond carrys out the stream of waterpipe flow meter with magnesium salts, the concentration of ammonium salt concentrated solution and regulating reservoir Amount, and according to molar ratio：Mg²⁺∶NH₄ ⁺: p=(1~1.2): (0.8~1): 1 ratio, magnesium salts, the ammonium salt solution of preparation, meter Magnesium salts, the dosing flow of ammonium salt are calculated, adjusts the solenoid valve of chemical feed pipe to reach corresponding flow.The process can be by robot control system(RCS) It completes, is also manually operable.Waste water quality stablize in the case of, magnesium salts, ammonium salt concentration are certain, reaction tank can be added water flow and It maintains after magnesium salts, ammonium salt dosing flow-rate adjustment are good, is finely adjusted according to the phosphate content of waste water.The choosing of magnesium salts, ammonium salt medicament Select, may be selected the solubility containing corresponding ion it is higher commonly use medicament to prepare, can according to its solubility prepare higher concentration Dope.Add alkali pump flow should not be too large it is too small, should be according to the pH value and operating experience measured in water water and regulating reservoir To adjust.

The start and stop of mixer 11,12,13 and electromagnetic flowmeter 6 link, when electromagnetic flowmeter 6 has reading, mixer 11, 12nd, 13 start, and when the reading of electromagnetic flowmeter 6 is zero, then mixer works on to be delayed after 15min and stop.Work as mixer When not starting, any chemicals dosing plant does not start.Three pool bottoms of reaction zone have an evacuated tube 23, and when equipment normal operation empties Valve on pipe 23 is closed, and the valve in evacuated tube 23 is then opened when more than processing system is not intake when continuous 8 is small, will be reacted The water in area is discharged, and evacuated tube 23 finally imports spoil disposal main pipe 26, into storage basin.

Two level adds the water outlet in alkali area 3 to be discharged into through drainpipe 27 in Chu Chen areas 4, has overflow pipe 28 at 27 top 10cm of drainpipe In parallel therewith, 2 pipelines import main pipe and stretch into 50cm or so under 4 liquid level of Chu Chen areas, have perforate to ensure that draining is smooth above main pipe.Just The pond in heavy area 4 holds for 2~3 times of crystallization reaction area, and interior equipped with mixer 17, the agitating shaft of mixer 17 runs through the top in Chu Chen areas And bottom, and have three groups of agitating paddles in upper, middle and lower portion, mixer 17 when equipment works, that is, electromagnetic flowmeter 6 has reading more than zero Shi Changkai, rotating speed be 100rpm within being slowly stirred, it is ensured that the mud in area's water can be stirred, sludge be in it is neither hardened in The state that bottom of pond can slowly sink again.4 bottom of Chu Chen areas is connected with drainpipe 24, has valve on drainpipe, per 10min Open valves Once, each spoil disposal 2min or so, electrically operated valve can also be set by being manually operable is automatically brought into operation spoil disposal.It is opened after terminating operation daily The water in Chu Chen areas is discharged valve in evacuated tube 24, and evacuated tube 24 finally imports spoil disposal main pipe 26, into storage basin.Just There is 29 vertical section of drainpipe to turn 90 degrees the curved center for becoming horizontal segment, waste water being introduced to Jing Chen areas 5 after receiving water under heavy 4 liquid level of area Lead mud cylinder 19.

Waste water into Jing Chen areas 5 is still mud mixture, and lead mud cylinder 19 by center carries out muddy water into Hou Jingchen areas 5 Separation.Jing Chen areas 5 and Chu Chen areas 4 can set same volume.Here, sludge density is big and is precipitated to bottom of pond, mud scraper 18 is slowly transported Row.A small amount of body refuse may have Slag Scraping Device 20 to strike off floating to the water surface.More water is received in clean Shui Jingchen areas top via annular Weir 21 receives water and flow to outlet pipe 30, into next stage processing.Sludge pipe 25 is arranged at Jing Chen areas bottom, has valve on sludge pipe, often Once, each spoil disposal 2min or so, electrically operated valve can also be set by being manually operable is automatically brought into operation 10min Open valves spoil disposal.With just Heavy area is the same, terminates to open the valve in evacuated tube 25 after running daily, the water in Chu Chen areas is discharged, evacuated tube 25 is finally converged Enter spoil disposal main pipe 26, into storage basin.

The place of grease factory high phosphorus Wastewater Pretreatment equipment COD high phosphorus refining wastewater high to grease factory provided by the utility model Science and engineering skill is as follows：

1. the high COD high phosphorus refining wastewater of grease factory enters dosing mixing pit 1, under the stirring of mixer 11, according to waste water The phosphate concn contained in flow and waste water adds in magnesium salts, ammonium salt by certain flow；

2. addition magnesium salts, the waste water of ammonium salt enter first-level alkali adding area 2, under the stirring of stirring 12, by online pH meter 15 Control adds in liquid caustic soda by certain flow, pH value is made to adjust to 7.5 or so；

3. after first-level alkali adding, waste water enters two level and adds alkali area 3, under the stirring of stirring 13, by online pH meter 16 Control adds in liquid caustic soda by certain flow, pH value is made to adjust to 8.5 or so；

4. into Chu Chen areas 4, mixer 17 is slowly stirred for the waste water gravity flow to react, crystal mixes a large amount of emulsifications Oil, organic matter are stirred, while are slowly precipitated to sludge bucket.Valve on the sludge pipe 24 of 4 bottom of Chu Chen areas is opened per 10min 2min or so carries out spoil disposal.Sludge content less waste water in top is imported Jing Chen areas 5 by the subsurface water pipe of receiving in Chu Chen areas 4；

5. mud cylinder 19 is led at the center that mud mixture enters Jing Chen areas 5, mud-water separation is carried out.Sludge after mud-water separation sinks It forms sediment to sludge bucket, mud scraper 18 slowly rotates, and the valve on the sludge pipe 25 of 5 bottom of Jing Chen areas opens 2min or so per 10min Carry out spoil disposal.More clean water gravity flow enters next processing unit.

Embodiment

Grease factory Wastewater Pretreatment facility：Alkali area 3, Chu Chen areas 4, essence are added by dosing mixed zone 1, first-level alkali adding area 2, two level Heavy area 5 is sequentially connected.And set magnesium salts throwing device 8, ammonium salt throwing device 9, liquid caustic soda throwing device 10.

1) magnesium salts, ammonium salt are added in dosing mixing pit；

Waste water enters dosing mixed zone 1, and it is V that pond, which holds, is measured herein according to the phosphate on-line detector on inlet channel Phosphate concn and electromagnetic flowmeter flow reading, in molar ratio：Mg²⁺∶NH₄ ⁺: p=(1~1.2): (0.8~1): 1 ratio, magnesium salts, the ammonium salt solution of configuration calculate the dosing flow of magnesium salts, ammonium salt, adjust the flow of dosing pump, add in suitable Magnesium salts, the ammonium salt of amount.Dosing carries out under the stirring of mixer 11.HRT=30min.

2) carry out adjusting pH value for the first time in first-level alkali adding area；

Add magnesium salts, the waste water of ammonium salt enters first-level alkali adding area 2, pond holds for V, herein according to the data of online pH meter 14 and Experience adjusts plus the flow of alkali pump, adds in the liquid caustic soda that concentration is 20%.Add the start and stop of alkali pump by the control of online pH meter 15, by one PH value control range in Ji Jiajian areas：In the range of 7.0 ＜ pH ＜ 7.5.After first-level alkali adding, waste water is via 10cm under liquid level The water hole excessively controlled enters two level and adds alkali area 3, and under the stirring of mixer 13, concentration is added in as 20% by liquid caustic soda adding equipment 10 Liquid caustic soda, adding for liquid caustic soda is controlled by online pH meter 16, in two level plus alkali area, pH value control range：8.0 ＜ pH ＜ 8.5. HRT =30min.

3) in two level alkali area is added to carry out second and adjusts pH value；

Waste water gravity flow after first time plus alkali adds alkali area 3 into two level, and it is V that pond, which holds, and continuously adding concentration herein is 20% liquid caustic soda.The start and stop of alkali pump is added, as pH value ＜ 8.5, to be added alkali pump automatic start by the control of online pH meter 16, work as pH value During ＞ 8.5, alkali pump is added to be automatically stopped.Alkali process is added to be carried out under the stirring of mixer 13.HRT=30min.

4) primary deposition is carried out in Chu Chen areas；

Add the waste water after alkali that crystallization reaction occurs, gravity flow is held into Chu Chen areas 4, pond for 6V.In slowly stirring for mixer 17 It mixes down, sludge suspension is in waste water and slowly precipitates.The valve 2min opened per 10min on a bottom sludge pipe 24 is arranged Mud.

5) further mud-water separation is carried out in Jing Chen areas.

The waste water for being mixed with a small amount of sludge leads mud by the center that subsurface receipts water pipe is imported in Jing Chen areas 5 in Chu Chen areas 4 Cylinder 19 carries out mud-water separation into Jing Chen areas 5.Mud scraper 18 collects sludge to bucket, and a bottom spoil disposal is opened per 10min Valve 2min on pipe 25 carries out spoil disposal.Scum silica frost is struck off by Slag Scraping Device 20, after more clean water is collected by annular receipts mill weir 21 Gravity flow is into outlet pipe 22, into next stage processing.

Facility operation effect：Influent COD is generally 8000mg/L~120000mg/L, and TP is 500mg/L or so.Sedimentation basin The COD of water outlet can usually be down to 2000mg/L or so, and TP can be down within 10mg/L.Specific handling result Fig. 3,4.

Claims (4)

1. a kind of pre-processing device of grease factory refining wastewater, including the inlet channel, reaction zone, just heavy being connected in turn Area, Jing Chen areas, it is characterised in that：Three-level is divided into reaction therein, is followed successively by dosing mixing pit, first-level alkali adding area, two level add Alkali area sets electromagnetic flowmeter, phosphate on-line detector, dosing mixing pit peripheral hardware magnesium salts dosing system, ammonium salt on inlet channel Dosing system, level-one, two level add alkali area peripheral hardware liquid caustic soda throwing device, and the dosing mixing pit of reaction zone, first-level alkali adding area, two level add Alkali area is all provided with mixer, online pH meter, and Chu Chen areas set mixer, and Jing Chen areas set mud scraper, mud cylinder, annular are led in Slag Scraping Device, center Receive mill weir.

2. a kind of pre-processing device of grease factory refining wastewater according to claim 1, it is characterised in that：Reaction zone adds In medicine mixing pit, equipped with magnesium salts chemical feed pipe and ammonium salt chemical feed pipe.

3. a kind of pre-processing device of grease factory refining wastewater according to claim 1, it is characterised in that：The one of reaction zone Ji Jiajian areas, two level add alkali area, in the liquid caustic soda for being added with stirring 20% concentration of mixer, add the start and stop of alkali pump by corresponding area The control of online pH meter signal, pH value control range in first-level alkali adding area：7.0 ＜ pH ＜ 7.5, two level add alkali area, pH value control Scope：8.0 ＜ pH ＜ 8.5.

4. a kind of pre-processing device of grease factory refining wastewater according to claim 1, it is characterised in that：Chu Chen is set in area The rotating speed of mixer is 10~50rpm.