CN201309877Y - Coking wastewater treatment recycling device - Google Patents

Abstract

The utility model relates to a coking wastewater treatment device, which is characterized in that it includes an intensified pretreatment part, a biological and sludge treatment part, and a water reuse treatment part, wherein the electrochemical equipment in the intensified pretreatment part is connected to the effluent of air flotation The influent of biological treatment; the outlet pipe of the MBR effluent tank in the biological and sludge treatment part is connected in series with the ozone contact tower, activated carbon filter tower and RO device in the reuse water treatment part. Advantages: A new combination structure is given for coking wastewater; effective combination of traditional oil removal, biochemistry, electrochemistry and membrane technology; use of electrochemistry to strengthen pretreatment to improve the biochemical properties of refractory pollutants; use of MBR to strengthen Biochemical treatment; ozone-activated carbon-RO reuse treatment design is reasonable; it not only solves the difficult problem of coking wastewater, but also achieves the purpose of reuse.

Description

Coking wastewater treatment and reuse device

technical field

The utility model relates to a coking wastewater treatment and recycling device, which belongs to the technical field of industrial wastewater treatment.

Background technique

Coking wastewater is mainly composed of water in coking coal, wastewater from gas purification process, tar and wastewater from crude benzene processing. It is a high-concentration refractory industry containing phenol, cyanide, oil, ammonia and a large amount of inorganic and organic substances. waste water.

At present, the domestic coking wastewater treatment technology is mainly biological treatment, which is not only the conventional "A-O" and "A-A-O" process, but also part of the coking wastewater is treated to the third-level standard COD<500mg/L to directly quench the coke, and transfer the pollution to the atmosphere. Most coking wastewater is treated to discharge COD150-500mg/L, which seriously pollutes the water environment. With the maturity and promotion of CDQ technology, the country has banned the use of treated coking wastewater for coke quenching, and at the same time strictly controlled coking wastewater treatment to reach -Class emission standard, that is, COD<100mg/L. However, the main coking wastewater treatment system actually operated in China is still "oil removal pretreatment - hydrolytic acidification - anoxic - aerobic - contact oxidation - precipitation - dosing precipitation - ceramsite filtration - activated carbon adsorption", its biological treatment and filtration treatment It cannot reach the first-level emission standard of COD<100mg/L, and the adsorption life of activated carbon is too short, so frequent replacement is unaffordable economically, and the purpose of first-level emission and treatment and reuse cannot be achieved at all.

Contents of the invention

The utility model provides a coking wastewater treatment and reuse device. The purpose is to overcome the defect that the effluent quality of the existing coking wastewater treatment technology is difficult to meet the discharge standard, and at the same time, it can reuse water and save water. A new combined process is presented, which uses heavy oil removal-air flotation-electrochemical pretreatment, anaerobic-facultative-aerobic-aerobic-MBR biological treatment and ozone-activated carbon-RO reuse treatment to treat coking wastewater processed and reused.

The technical solution of the utility model: its structure includes an enhanced pretreatment part, a biological and sludge treatment part, and a water reuse treatment part, wherein the electrochemical equipment in the enhanced pretreatment part is connected to the effluent of air flotation and the influent of biological treatment ; The outlet pipe of the MBR outlet tank in the biological and sludge treatment part is connected in series with the ozone contact tower, activated carbon filter tower and RO device in the reuse water treatment part.

The coking wastewater A enters the grease trap through the pipeline, and the heavy oil B is separated by the grease trap and transported out by tank truck. The flotation dosing system adds flocculants and coagulants to the air flotation equipment, and uses air flotation to further remove oil and suspended solids. The scum C produced by air flotation is discharged to the sludge concentration and dehydration equipment, and the effluent from the air flotation equipment enters the electrochemical The equipment, using the enhanced electrochemical treatment, integrates electroflotation, electrocoagulation, and strong oxidation to decompose the refractory biodegradable substances in the wastewater to improve the effect of subsequent biological treatment. The scum D produced by electrochemistry is also discharged into the sludge concentration Dehydration equipment. In the biological and sludge treatment part, the electrochemical effluent enters the anaerobic, facultative, aerobic, and MBR membrane separation tanks of the biological treatment system in turn. The air fan B1 supplies oxygen to the biological aerobic tank, and the membrane area fan B2 is used to supply air to the biological MBR membrane separation tank, and the remaining sludge F in the biological MBR membrane separation tank is discharged into the sludge concentration and dehydration equipment and the mixing of the biochemical MBR membrane separation tank The liquid reflux E is returned to the biological and aerobic tank for further treatment. The sludge concentration and dehydration equipment conducts concentration and dehydration treatment of the air flotation scum C, electrochemical scum D, and biochemical residual sludge F. The resulting mud cake G is transported out, and the filtrate H Return to the regulating tank for retreatment, and the effluent of MBR is sucked to the MBR effluent pool by suction pump P2. In the treatment part of reused water, use the ozone lifting pump P3 to lift the biochemically treated effluent in the MBR effluent tank to the ozone contact tower, and use the ozone generated by the ozone generator to decompose the remaining refractory pollutants after biochemical treatment in the ozone contact tower , and then the pollutants are further removed through the activated carbon filter tower, and the effluent enters the intermediate pool, and then the intermediate water pump P4 is used to pressurize the water in the intermediate pool and the RO protection agent added by the RO dosing system to filter out particles larger than 5 μm through the security filter. , to protect the work of RO, the effluent enters the RO device through the RO high-pressure pump P5, and the RO membrane is used to further remove pollutants and salts in the water, which meets the requirements of reuse. The RO concentrated water I goes to the coal yard to press dust, and the RO device The effluent water enters the reuse water tank, and then the reuse water J in the reuse water tank is sent back to the user through the pipeline through the reuse water pump P6.

The utility model has the advantages: (1) A new combined process is provided for coking wastewater; (2) Traditional degreasing, biochemistry, electrochemistry, and membrane technology are effectively combined; (3) Electrochemistry is used to strengthen pretreatment , improve the biochemical properties of refractory pollutants; (4) use MBR to strengthen biochemical treatment; (5) the reuse treatment design of ozone-activated carbon-RO is reasonable; (6) not only solves the problem of coking wastewater, but also achieves purpose of reuse.

Description of drawings

Accompanying drawing 1 is the schematic structural diagram of coking wastewater treatment and recycling device.

In the figure, I is the enhanced pretreatment part, II is the biological and sludge treatment part, III is the reuse water treatment part, A represents coking wastewater, B represents heavy oil, C represents air flotation scum, D represents electrochemical scum, E stands for mixed liquid return, F stands for excess sludge, G stands for dry sludge export, H stands for filtrate return, K stands for RO concentrated water (to coal yard), J stands for reuse water; P1 stands for lift pump, P2 stands for MBR suction Pump, P3 means ozone lift pump, P4 means intermediate water pump, P5 means RO high pressure pump, P6 means recovery water pump; B1 means aeration fan, B2 means membrane area fan; 1 means grease trap, 2 means regulating tank, 3 means air Floating dosing system, 4 means air flotation equipment, 5 means electrochemical equipment, 6 means biological dosing system, 7 means biological anaerobic tank, 7' means biological facultative oxygen tank, 7" means biological aerobic tank, 7'" Represents the biological MBR membrane separation tank, 8 represents the MBR effluent tank, 9 represents the sludge concentration and dehydration equipment, 10 represents the ozone generator, 11 represents the ozone contact tower, 12 represents the activated carbon filter tower, 13 represents the intermediate pool, 14 represents the RO dosing system , 15 represents a security filter, 16 represents an RO device, and 17 represents a reuse water tank.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

Referring to accompanying drawing 1, it is characterized in that it includes an enhanced pretreatment part, a biological and sludge treatment part, and a treatment part for reused water, wherein the electrochemical device 5 in the enhanced pretreatment part is connected to the effluent of the air flotation device 4 and the influent of biological treatment ; The outlet pipe of the MBR outlet pool 8 in the biological and sludge treatment part is connected in series with the ozone contact tower 11, activated carbon filter tower 12, and RO device 16 in the treatment part of reused water.

The structure of the enhanced pretreatment is that the coking wastewater A enters the grease trap 1 through the pipeline, the separated heavy oil B is transported outside, the effluent of the grease trap 1 enters the regulating pond 2, and the water inlet of the lift pump P1 is connected to the regulating pond 2, the outlet of lift pump P1 lifts the coking wastewater to the inlet of air flotation 4, the air flotation scum C is discharged to sludge concentration and dehydration equipment 9, and the air flotation dosing system 3 transfers the flocculant and coagulant Add the air flotation device 4, the effluent of the air flotation device 4 enters the electrochemical device 5, and the electrochemical scum D of the electrochemical device 5 is discharged into the sludge concentration dehydration device 9;

The structure of the biological and sludge treatment is that the effluent of the electrochemical 5 enters the biological anaerobic tank 7, the biochemical dosing system 6 adds nutrients and alkali to the biological anaerobic tank 7, and the effluent of the biological anaerobic tank 7 enters the biological anaerobic tank 7. The effluent of the facultative oxygen tank 7' and the biological aerobic tank 7' enters the biological aerobic tank 7", the aeration fan B1 is connected to the biological aerobic tank 7" to supply oxygen for it, and the effluent of the biological aerobic tank 7" enters the biological The MBR membrane separation tank 7'", the membrane zone fan B ₂ is connected to the biological MBR membrane separation tank 7'" to supply air to it, and the remaining sludge F of the biological MBR membrane separation tank 7'" is discharged into the sludge concentration and dehydration equipment 9 , The mixed liquid in the biological MBR membrane separation tank 7'" returns to the biological and aerobic tank 7', and the sludge concentration and dehydration equipment 9 performs concentration and dehydration treatment on the air flotation scum C, electrochemical scum D, and excess sludge F , the generated mud cake G is exported, and the filtrate H is returned to the adjustment tank 2. The suction end of the MBR suction pump P2 is connected to the effluent of the biological MBR membrane separation tank 7'", and the effluent of the MBR suction pump P2 is sent to the MBR effluent tank 8. At the water inlet end, the outlet water of the MBR outlet pool 8 is connected to the inlet port of the ozone lift pump P3;

In the treatment of the reclaimed water, the effluent of the MBR effluent tank 8 is promoted to the water inlet end of the ozone contact tower 11, the ozone generator 10 is connected to the ozone contact tower 11, and the effluent of the ozone contact tower 11 flows to the activated carbon filter tower 12, and the activated carbon The outlet water of the filter tower 12 flows to the intermediate pool 13, the inlet end of the intermediate water pump P4 is connected to the outlet of the intermediate pool 13, the outlet end of the intermediate water pump P4 is connected to the inlet end of the security filter 15, and the RO dosing system 14 is also connected to the security filter. The water inlet of the filter 15, the water inlet of the RO high-pressure pump P5 is connected to the water outlet of the security filter 15, the water outlet of the RO high-pressure pump P5 is connected to the water inlet of the RO device 16, and the RO concentrated water I is sent to the coal yard to press dust , the effluent of the RO device 16 goes to the reuse water tank 17, the inlet end of the recovery water pump P6 is connected to the water outlet of the recovery water tank 17, and the effluent of the recovery water pump P6 is reuse water J and can be sent back to the user through the pipeline.

Example:

Treatment and reuse of 92.5m ³ /h coking wastewater in a certain coking plant

1. Treated water volume:

The volume of coking wastewater is 92.5m ³ /h (including 60m ³ /h of ammonia distillation wastewater and 32.5m ³ /h of other wastewater). In order to save water during the treatment process, recycled sewage is used as defoaming water in the biochemical process, and the final biochemical treatment The capacity is 180m ³ /h, and the recycled water consumption is 135m ³ /h.

2. Influent water quality:

Water quality of coking wastewater (except pH, unit: mg/L)

project COD _Cr NH ₃ -N Phenols Cyanide Petro SS pH TDS value ＜3500 ＜200 ＜700 ＜20 ＜30 ＜300 7～8 ＜10000

Circulating sewage water quality (hardness and alkalinity are measured by CaCO ₃ )

project conductance total hardness total alkalinity Chloride pH SiO ₂ COD _Mn temperature unit S/cm mg/L mg/L mg/L mg/L mg/L ℃ value ＜2000 ＜550 ＜485 ＜500 7～9 ＜40 ＜10 25～40

3. Outlet water quality:

                             (Unit: mg/L)

project COD _Cr NH ₃ -N Phenols Cyanide Petro TDS value ＜50 <5 ＜0.5 ＜0.5 <1 ＜300

4. Main design parameters of the system:

●Main structures:

Grease traps: 15m×4m×3m 4; regulating pools: 15m×10m×7m 2; biochemical anaerobic pools: 24m×10m×7m 2; biochemical and aerobic pools: 24m×10m×7m 2; biochemical Oxygen consumption pool: 30m×24m×7m2; biochemical MBR membrane separation pool: 8m×6m×4.5m 2; MBR pool: 8m×6m×4.5m 1; intermediate pool: 8m×3m×4.5m 1; Reuse pool: 1 block of 8m×3m×4.5m.

●Main water pump:

Lifting pump: Q＝130m ³ /h, H＝12m, N＝7.5kW 2 sets (1 for use and 1 for standby); MBR suction pump: Q＝72m ³ /h, H＝13m, N＝5.5kW 6 sets ( 4 for use and 2 for backup); ozone lift pump: Q=90m ³ /h, H=20m, N=11kW 3 sets (2 for 1 backup); middle water pump: Q=90m ³ /h, H=20m, N=11kW 3 sets (2 for use and 1 for standby); RO high pressure pump: Q＝90m ³ /h, H＝280m, N＝90kW 2 sets; Recycling water pump: Q＝70m ³ /h, H＝32m, N＝11kW 3 sets (2 for 1 backup).

●Fan:

Aeration fan: C55-1.7 type, 55m ³ /min, 70kPa, 90kW 4 units (2 for 2 standby); membrane area fan: C35-1.7 type, 35m ³ /min, 55kPa, 50kW 3 units (2 for 1 standby) ).

●Main equipment:

Air flotation equipment: 50m ³ /h 2 sets; Electrochemical equipment: its structure mainly includes a foam scraper installed on the electrolytic cell, made of iridium-plated, ruthenium-titanium plate anode, stainless steel cathode, etc., 50m ³ /h, 185kW 2 sets; MBR membrane device: Memstar PVDF material MBR membrane module 640m ² /set 20 sets; sludge thickening and dewatering equipment: including sludge screw pump Q=30m ³ /h, H=0.3MPa, N=2.8kW 2 sets (1 for 1 equipment), sludge thickening and dewatering machine B=1m, Q=6～11m ³ /h 1 set, flushing pump Q=10m ³ /h, H=52m, N=5.5kW 2 sets (1 for use and 1 for standby); ozone Generator: 3kg, 45kW (oxygen as gas source) 2 sets: Ozone contact tower: 4 sets Φ2800mm×8000mm; Activated carbon filter tower: 4 sets Φ2500mm×8000mm; Security filter: 2 sets DN600mm, 5μm, 40”×35 core ;RO device: Q=67.5m ³ /h (including 75 PROC10 RO membranes, 15 400PSI 8”5-core membrane tubes) 3 sets (2 for use and 1 for backup).

●Dosing system:

Air flotation dosing system: including 2 sets of PAC dosing pump Q=500L/h, P=0.35MPa, N=0.75kW, and 2 sets of PAM dosing pump Q=500L/h, P=0.35MPa, N=0.75kW ;Biochemical dosing system: including NaOH metering pump Q=0.2～1.2m ³ /h, P=0.35MPa, N=1.5kW 2 sets (1 for use and 1 for backup), K ₂ HPO ₄ metering pumps 0.2～1.2m ³ / h, P=0.35MPa, N=1.5kW 2 sets (1 for use and 1 for backup); RO dosing system: including 2 sets of antiscalant metering pump AA976 (1 for use and 1 for backup), 1 500L PE medicine box, reduction 2 sets of AA956 metering pumps (1 for use and 1 for backup), 1 1000L PE medicine box, 2 sets of AA956 type non-oxidizing fungicide metering pumps (1 for use and 1 for backup), and 1 1000L PE medicine box.

●Other related supporting systems:

Heavy oil delivery pump: Q＝5m ³ /h, H＝6m, N＝4kW 2 sets (1 for use and 1 for backup); Light oil delivery pump: Q＝10m ³ /h, H＝10m, N＝0.75kW 2 (1 for use and 1 for standby); belt degreaser: 4 sets of GP-12 type; mixed liquid return pump: Q=450m ³ /h, H=0.6m, N=2.5kW 4 sets; residual sludge discharge pump : Q＝30m ³ /h, H＝10m, N＝2.2kW 2 sets; RO flushing pump: Q＝100m ³ /h, H＝35m, N＝22kW 1 set; RO CIP cleaning equipment: including cleaning water tank V＝ 1 set of 3m ³ , 1 set of cleaning filter DN600mm, 5μm, 40”×35 core, 1 set of RO cleaning water pump Q＝100m ³ /h, H＝32m, N＝18.5kW, adding HCl, NaOH, NaClO, lemon One acid metering tank and one metering pump; MBR off-line cleaning equipment: including MBR cleaning water tank PE V=3m ³ , MBR cleaning water pump Q=25m ³ /h, H=24m, N=3kW 2 sets ( 1 use and 1 spare); biochemical aerobic tank aeration head: SanitaireΦ9” rubber microporous membrane aeration head 1740 sets; biochemical and aerobic tank agitator: QJB400/980-3 type N=4kW 2 sets, QJB620/480-5 Type N=4kW 2 units.

Claims (6)

1, a kind of device of Treatment of Coking Effluent reuse, it is characterized in that comprising strengthen preprocessing part, biological and sludge treatment partly, the treating part of reuse water, wherein strengthen the water inlet that electrochemical apparatus in the preprocessing part connects pneumatically supported water outlet and biological treatment; The rising pipe of biological and the sludge treatment MBR outlet sump in is partly connected with ozone contact tower, active carbon filter tower, RO device in the treating part of reuse water.

2, the device of a kind of Treatment of Coking Effluent reuse according to claim 1, it is characterized in that described reinforcement preprocessing part comprises oil trap, equalizing tank, air supporting medicine system, airfloat equipment, electrochemical apparatus, wherein oil trap and equalizing tank join, equalizing tank joins by lift pump and airfloat equipment, the outlet of the inlet of airfloat equipment and air supporting medicine system is joined, and the outlet of airfloat equipment and the inlet of electrochemical apparatus join.

3, the device of a kind of Treatment of Coking Effluent reuse according to claim 1, it is characterized in that described biology and sludge treatment partly comprise biological medicine system, bio anaerobic pond, MBR outlet sump, wherein the water-in in the water outlet of biological medicine system and bio anaerobic pond joins, and the water outlet in bio anaerobic pond joins by the water-in of MBR suction pump and MBR outlet sump by biological oxygen compatibility pool, biological oxygen consumption pond, biological MBR membrane sepn pond successively.

4, the device of a kind of Treatment of Coking Effluent reuse according to claim 3 is characterized in that being connected to Aeration fan, film district blower fan respectively on described biological oxygen consumption pond, the biological MBR membrane sepn pond.

5, the device of a kind of Treatment of Coking Effluent reuse according to claim 1, it is characterized in that ozone contact tower, active carbon filter tower, intermediate pool, the water inlet pipe of security personnel's strainer, RO device, reuse water tank serial connection in the treating part of described reuse water, the inlet pipe of ozonizer and ozone contact tower is joined, and the rising pipe of RO medicine system connects the water inlet pipe of security personnel's strainer.

6, the device of a kind of Treatment of Coking Effluent reuse according to claim 5, it is characterized in that described intermediate pool and security personnel strainer water inlet pipe between the dress in the middle of water pump, dress RO high-pressure pump reinstalls on the rising pipe of reuse water tank and uses water pump between security personnel's strainer and RO device.

Images