CN1057513C - Method and apparatus for treating sewage from oil refinery in two steps - Google Patents
Method and apparatus for treating sewage from oil refinery in two steps Download PDFInfo
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- CN1057513C CN1057513C CN 96109705 CN96109705A CN1057513C CN 1057513 C CN1057513 C CN 1057513C CN 96109705 CN96109705 CN 96109705 CN 96109705 A CN96109705 A CN 96109705A CN 1057513 C CN1057513 C CN 1057513C
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Abstract
The present invention relates to a method for treating organic sewage and a treating device thereof. The method for treating organic sewage is characterized in that the original three-step method is changed into a two-step method, namely that the first step is an oil isolating technology, and the second step is a membrane method biochemical technology and main control parameters thereof. The device is mainly a membrane method biochemical tank which is composed of an acidating ditch, a biochemical ditch and a settling tank, wherein the acidating ditch and the biochemical ditch are communicated by a balancing passage, fibrous filler is hung in the acidating ditch and the biochemical ditch, and a rope net is hung in the settling tank. The present invention is suitable for sewage treatment of an oil refinery and has the advantages of less equipment, simple flow, easy operation and control, shortening of membrane developing time and no secondary pollution.
Description
The present invention relates to the processing of a kind of treatment process of organic sewage, particularly sewage from oil refinery.
The sewage disposal of refinery, at present general producer all adopts the three-step approach treatment process, i.e. the first step oil removal, the second step flotation, the 3rd step activated sludge biochemical.By oil removal, remove the oil slick in the decontaminated water; By flotation, remove the oil in water emulsion in the decontaminated water; By biochemistry, remove dissolving oil and other water soluble organic substance in anhydrating.In the floatation process in this three-step approach, the complete assembly that needs compressor, pressure air-dissolving tank, release pond, deslagging pond, medicine and install medicine additional.Facts have proved that this cover technology denitrification functions is poor, salts contg height, scum silica frost are handled also difficulty, operational condition requirement harshness in the treated water, can not adapt to the needs that concentration of wastewater has bigger variation.Therefore the excess sludge microbial film A/O system handles trade effluent complex art that will not have that has has in recent years been introduced in the oil refining sewerage processing, has replaced the 3rd step in the three-step approach, and promptly activated sludge biochemical has formed new three-step production process.In this novel process, (one) needs to add a large amount of soda ash Na
2CO
3(about 60mg/l sewage) has so not only improved cost of water treatment, has also increased the salts contg of handling in the water; (2) because some processing parameter is improper, make the characteristics of embrane method biochemistry can not get performance, not only can not adapt to concentration of wastewater variation needs greatly, water outlet also can only reach national secondary discharge standard; (3) latter end is not established settling bowl, is unfavorable for the smooth running of biological flora, has influenced the processing quality of water.
The objective of the invention is a kind of simple processing method that proposes in order to overcome the weak point in the above-mentioned technology, and realize the appliance arrangement that this technology is used.Can reach national grade one discharge standard by this art breading refinery sewage, simplify technical process, be convenient to operation, reduce cost.
Technical solution of the present invention is achieved in that a kind of sewage from oil refinery two-step approach treatment process, and the first step is an oil removal technology, adds alkali in biochemical process, and its special character is:
(1) second step was embrane method biochemical technology technology;
(2) sewage stops more than 10 hours in oil removal technology;
(3) dissolved oxygen content in biochemistry pool: being 0.4～0.8mg/l in the acidifying ditch 3, is 1.1～1.5mg/l in the biochemical ditch 9,14, is 2.2～2.8mg/l in the biochemical ditch 10,13, is 3.2～4.0mg/l in the biochemical ditch 11,12;
(4) in the embrane method biochemical process, sewage temperature remains on 35～40 ℃;
(5) make Na in the sewage by adding alkali
2S content reaches 165～200mg/l sewage;
(6) in the embrane method biochemical process, the residence time of sewage in biochemical ditch 9,14 is more than 6 hours.
In above-mentioned technical solution, equipment used is made of oil removal jar (or oil trap) and embrane method biochemically, is hung with fibrous packing in the biochemical ground; Gas blower is connected with aerator in being installed in biochemistry pool by pipeline; Alkali liquid tank 32 passes in the biochemical ditch 10,13 by pipeline, pump 31, valve 20,25.Its special character is:
(1) the oil removal jar is connected with biochemistry pool by pipeline;
(2) biochemistry pool is made of acidifying ditch 3, biochemical ditch 9～14 and settling tank 23.Acidifying ditch 3 is connected with biochemical ditch 9,14 respectively by the balance channel 5,8 at its two ends, bottom. Biochemical ditch 9,14 is connected with biochemical ditch 10,13 respectively by balance channel 15,18. Biochemical ditch 10,13 is connected with biochemical ditch 11,12 respectively by balance channel 6,7.Biochemical ditch 11,12 is connected with circular settling tank 23 by pipeline 21,22.Pipeline 21 is connected with pipeline 22, and pipeline 22 is on being oriented in a tangential direction with circular settling tank.Common outlet 24 places of pipeline 21,22 in settling tank 23 are provided with flow control valve;
(3) be hung with the netting 27 that helps sludge settling in the settling tank 23.The settling tank center is provided with water out, and it highly is lower than settling tank pool wall height;
(4) the collection mud pit 28 in the settling tank 23 passes to the top of acidifying ditch 3 by pipeline, pump 26, valve 19, and the pipeline the other end is the sludge outlet end by valve 30.
In above-mentioned described device, its special character is that balance channel is a kind of passage of section deformation, is made up of two hollow rectangular parallelepipeds 34 and 35.The vertical height of the side's of inlet rectangular parallelepiped 34 is 2 times of exporter's rectangular parallelepiped 35 vertical height.The sectional area of two rectangular parallelepipeds and volume are all equal substantially.Its length equals 2～4 times of pool wall 33 thickness.
In above-mentioned technological process, its special character is:
(1) in addition alkali lye be the alkali-washing waste liquid of refinery;
(2) the best average dissolved oxygen content in acidifying ditch 3 is 0.6mg/l;
(3) in biochemical ditch 9～14, best average dissolved oxygen content is respectively: for 1.3mg/l, being 2.5mg/l in the biochemical ditch 10,13 in the biochemical ditch 9,14, is 3.6mg/l in the biochemical ditch 11,12.
Advantage of the present invention is: (one) can form the planktonic organism group and the comparatively ideal aerobic/anaerobic system of capacity.Microbial film and planktonic organism group complement each other the two, form stronger denitrification functions.Therefore be applicable to the processing high concentration organic sewage.(2) can generate biological flora naturally in this biological process, not need artificial special the cultivation.(3) owing to reduced floatation process, not only reduce large number quipments and energy consumption, but also made things convenient for operation control.(4) utilize this technical process method, can shorten the microbial film development time, make technology enter normal water treatment state quickly, and what is more important can be resisted concentration of wastewater variation impact greatly effectively.(5) make the alkali-washing waste liquid of refinery obtain utilization, thereby also removed many special treatment process from.(6) settling tank is unpowered settling tank, has both saved power set, has also saved electric energy.(7) this biochemical process excess sludge is a soil ulmin all almost, is used for agriculture production so can be used as farm manure.
Accompanying drawing 1 is process flow diagram of the present invention;
Accompanying drawing 2 is flow path device of the present invention structural plan synoptic diagram;
Accompanying drawing 3 is settling tank cross-sectional view in the flow path device of the present invention;
Accompanying drawing 4 is the balance channel sectional front view;
Accompanying drawing 5 is a balance channel section upward view.
Be described further (embodiment) below in conjunction with accompanying drawing.
The embrane method biochemistry pool is made up of horizontal acidifying ditch 3 and biochemical longitudinally ditch 9～14 and circular settling tank 23.The capacity of acidifying ditch 3 is about 2 times of every biochemical ditch capacity, and acidifying ditch 3 is communicated with biochemical ditch 9,14 respectively by the balance channel 5,8 at two ends, ditch bottom surface. Biochemical ditch 9,14 is connected by the balance channel 15,18 and the biochemical ditch 10,13 of ditch bottom face respectively. Biochemical ditch 10,13 is connected by the balance channel 6,7 and the biochemical ditch 11,12 of ditch bottom face.Be hung with fibrous packing in acidifying ditch 3 and the biochemical ditch 9～14, with D-2 fiber type filler for well, the about 2.5Kg/M of its consumption
3Balance channel the 5～8,15, the 18th, a kind of passage of section deformation is made up of two hollow rectangular parallelepipeds 34 and 35.The vertical height of the hollow rectangular parallelepiped 34 of inlet side is exporter's vertical 2 times of height of hollow rectangular parallelepiped 35.The sectional area of two rectangular parallelepipeds and volume are all equal substantially.Their length equals 2～4 times of pool wall 33 thickness, and its bottom surface is with 36 equal at the bottom of the pond.The purpose of balance channel is to make the unequal mud of its both sides activity pursue stream with water, to keep the balance movement of technology biomass.
Settling tank 23 is circular awl pond, the end, and its capacity equals the capacity of a biochemical ditch.Be provided with collection mud pit 28 in pond base cone portion.Hang hydroformylation vinylon netting 27 along the pond radial direction in the pond.Water outlet 29 is the settling tank effluent pipe mouth, and water outlet is lower than settling tank pool wall height, is located at center, circular pond.In fact its outlet is positioned at pool inner water face center.Pipeline 21,22 is communicated with biochemical ditch 11,12 with settling tank 23 levels.Pipeline 21 is communicated with pipeline 22, and the direction of pipeline 22 is basic and circular settling tank is tangent, and its outlet 24 is positioned at the middle part of settling tank 23 nettings 27 vertical directions.Export 24 places the gate of dominant discharge is housed.
Sewage from oil refinery is injected oil removal jar 2, stop more than 10 hours, make the isolating while of oil slick in the sewage, also make sewage wherein obtain preliminary acidifying, then sewage is sent in the acidifying ditch 3 by pipeline.The dissolved oxygen average content is controlled in 0.4mg/l～0.8mg/l scope in this ditch, is best with average oxygen content 0.6mg/l, continues through after 8～10 hours the acidifying, and the balance channel 5,8 by the bottom of trench two ends enters in the biochemical ditch 9,14.In biochemical ditch 9,14, the dissolved oxygen average content in the sewage is controlled in 1.1mg/l～1.5mg/l scope, is best with average oxygen content 1.3mg/l.Under this environment, the planktonic organism group who forms gradually on the bobbles of fibrous packing in microbial film and the water forms the nitrification and denitrification place in the lump.Sewage is after effect in 8～10 hours, and the balance channel 15,18 by the ditch bottom enters in the biochemical ditch 10,13.In this two ditch, the dissolved oxygen average content is controlled in 2.2mg/l～2.8mg/l scope, is best with 2.5mg/l, and adds alkali simultaneously in this two ditch, as Na
2CO
3Solution etc.Present embodiment adopts and adds the refinery alkali-washing waste liquid.Mainly contain Na in the alkali-washing waste liquid
2S, phenol sodium, small amount of N aOH are generally with Na
2S calculates.Its method of calculation are with basicity Na
2CO
3Equivalent parts per million is converted into Na
2S equivalent parts per million, i.e. yellow soda ash equivalent: sodium sulphite equivalent=53: 39.The concentration of alkali-washing waste liquid and add-on, and the basicity of sewage etc., all with Na
2The S cubage.Can make the Na in the sewage
2S content remains on 165～200mg/l sewage and is advisable.The general Na that adds
2The amount of S is more than 45mg/l sewage.After 8～10 hours nitrification and denitrification effect, enter in the biochemical ditch 11,12 through the balance channel 6,7 of ditch bottom portion.In this two ditch, the dissolved oxygen average content is controlled in 3.2mg/l～4.0mg/l scope, is best with 3.6mg/l.The gas transmission state of above-mentioned control dissolved oxygen content generally should not be changed easily once determining.Especially bigger change should not be arranged, in order to avoid biomembranous habitual metabolism is damaged.In the higher zone of dissolved oxygen content control, note not making air-flow that sewage is produced the excessive activity that excessive impact causes sewage.The water temperature of sewage in biochemical ditch remains on 35～40 ℃.In biochemical ditch 11,12 through 8～10 hours nitrification and denitrification effect after, flow to the circular settling tank 23 through pipeline 21,22 from water outlet 16,17.When ordinary production, sewage is continuously to flow always.The above-mentioned described time that sewage stopped in oil removal jar 2, acidifying ditch 3, biochemical ditch 9～14, all get by calculating with its velocity of flow and each jar (ditch) volume.Common outlet 24 places of pipeline 21,22 are provided with the gate of liquid level difference between dominant discharge and biochemical ditch and the precipitation ground.The liquid level difference minimum is more than 300 millimeters, treatment capacity is big more, liquid level difference will be big more, when entering settling tank, water has certain firing rate to keep, promote the sewage slowly rotation in the pond in the settling tank, form circulation, sewage is constantly advanced by the netting 27 that hangs along the settling tank diametric(al), so that mud in the water is in time dammed, sinks in the collection mud pit at the bottom of the pond.
When this sewage disposal process flow operation initial stage, to collect mud in the mud pit 28 by pump 26, valve 19 squeezes in the acidifying ditch 3 and reacts, make the part of wherein degrading as yet contact, decompose with microorganism again, the mud that formed later in qualified two months up to water outlet could pass through valve 30 discharges.
In biological process, sewage temperature should remain on 35～40 ℃, should take the insulation measure winter in case of necessity.If water temperature is lower than 35 ℃, can in corresponding biochemical ditch, average dissolved oxygen content be improved 0.1mg/l by whenever low 2 ℃.
Generally speaking, the trace amounts of phosphorus in the oil refining sewerage can satisfy the needs of denitrification reaction, can not add microcosmic salt.But when water temperature is lower than 25 ℃, in the time of can not satisfying the denitrification reaction needs, can add a certain amount of phosphoric acid salt, additional amount can be controlled in 1～3mg/l sewage.
Utilize this processing method, the concentration of wastewater that is suitable for handling is generally:
COD (chemical oxygen demand (COD)) 700～1000mg/l
BOD (biochemical oxygen demand (BOD)) 400～600mg/l
Oil-contg 50～90mg/l
Volatile phenol 30～70mg/l
Sulfide 20～60mg/l
Ammonia nitrogen 30～60mg/l
PH value 7～10
Claims (4)
1, a kind of method of sewage from oil refinery two-step approach treatment process, the first step is an oil removal technology, adds alkali in biochemical ditch (10,13), it is characterized in that:
(1) second step was embrane method biochemical technology technology, its flow process is: the sewage in the oil removal jar (2) is sent in the acidifying ditch (3), send into biochemical ditch (9,14) by balance channel (5,8) after the acidifying, after the nitrification and denitrification effect, enter biochemical ditch (10,13) through balance channel (15,18), again after the nitrification and denitrification effect, enter biochemical ditch (11,12) through balance channel (6,7), through entering the settling tank 23 through pipeline (21,22) from water outlet (16,17) after the nitrification and denitrification effect;
(2) sewage stops more than 10 hours in oil removal technology;
(3) dissolved oxygen content in biochemistry pool: be 0.4～0.8mg/l in the acidifying ditch (3), biochemical ditch is 1.1～1.5mg/l in (9,14), and biochemical ditch is 2.2～2.8mg/l in (10,13), and biochemical ditch is 3.2～4.0mg/l in (11,12);
(4) in the embrane method biochemical process, sewage temperature remains on 35～40 ℃;
(5) by adding alkali, make Na in the sewage
2S content reaches 165～200mg/l sewage;
(6) in the embrane method biochemical process, sewage residence time in biochemical ditch (9,14) is more than 6 hours.
2, according to the method for claims 1 described sewage from oil refinery two-step approach treatment process, it is characterized in that:
(1) in addition alkali lye be the alkali-washing waste liquid of refinery;
(2) the average dissolved oxygen content in acidifying ditch (3) is 0.6mg/l;
(3) the average dissolved oxygen content in biochemical ditch (9～14) is: be 1.3mg/l in the biochemical ditch (9,14), biochemical ditch is 2.5mg/l in (10,13), and biochemical ditch is 3.6mg/l in (11,12).
3, a kind of device of sewage from oil refinery two-step approach treatment process is made of oil removal jar (2) and embrane method biochemistry pool, is hung with fibrous packing in the biochemistry pool; Gas blower is connected with aerator in being installed in biochemistry pool by pipeline; Alkali liquid tank (32) passes in the biochemical ditch (10,13) by pipeline, pump (31), valve (20,25), it is characterized in that:
(1) oil removal jar (2) is communicated with biochemistry pool by pipeline;
(2) biochemistry pool is by acidifying ditch (3), biochemical ditch (9～14), settling tank (23) constitutes, acidifying ditch (3) is by the balance channel (5 at its two ends, bottom, 8) respectively with biochemical ditch (9,14) be connected, biochemical ditch (9,14) by balance channel (15,18) respectively with biochemical ditch (10,13) be connected, biochemical ditch (10,13) by balance channel (6,7) respectively with biochemical ditch (11,12) be connected, biochemical ditch (11,12) by pipeline (21,22) be connected with circular settling tank (23), pipeline (21) is connected with pipeline (22), pipeline (22) is becoming on the horizontal tangent direction pipeline (21 with circular settling tank (23), 22) common outlet (24) locates to be provided with flow rate control gate;
(3) be hung with the netting (27) that helps sludge settling in the settling tank (23), the settling tank center is provided with water out (29), and it highly is lower than settling tank pool wall height;
(4) the collection mud pit (28) in the settling tank (23) passes to the top of acidifying ditch (3) by pipeline, pump (26), valve (19), and the pipeline the other end is the mud relief outlet by valve (30).
4, according to the device of claims 3 described sewage from oil refinery two-step approach treatment process, it is characterized in that fast balance channel be one the dress section deformation passage, form by two hollow rectangular parallelepipeds (34) and (35), the vertical height of the hollow rectangular parallelepiped (34) of inlet side is exporter's vertical 2 times of height of hollow rectangular parallelepiped (35), the sectional area of two rectangular parallelepipeds and volume equate that its length equals 2-4 times of pool wall (33) thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96109705 CN1057513C (en) | 1996-09-04 | 1996-09-04 | Method and apparatus for treating sewage from oil refinery in two steps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96109705 CN1057513C (en) | 1996-09-04 | 1996-09-04 | Method and apparatus for treating sewage from oil refinery in two steps |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1175555A CN1175555A (en) | 1998-03-11 |
| CN1057513C true CN1057513C (en) | 2000-10-18 |
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ID=5120537
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96109705 Expired - Fee Related CN1057513C (en) | 1996-09-04 | 1996-09-04 | Method and apparatus for treating sewage from oil refinery in two steps |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847348A (en) * | 2012-08-03 | 2013-01-02 | 福建圣达科技环保设备有限公司 | Dedusting desulfuration circular circulation sedimentation basin |
-
1996
- 1996-09-04 CN CN 96109705 patent/CN1057513C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847348A (en) * | 2012-08-03 | 2013-01-02 | 福建圣达科技环保设备有限公司 | Dedusting desulfuration circular circulation sedimentation basin |
| CN102847348B (en) * | 2012-08-03 | 2014-12-17 | 福建圣达科技环保设备有限公司 | Dedusting desulfuration circular circulation sedimentation basin |
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| Publication number | Publication date |
|---|---|
| CN1175555A (en) | 1998-03-11 |
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