CN104045210B - The treatment for reuse method of oil refining-Ethylene Complex unit sewage - Google Patents
The treatment for reuse method of oil refining-Ethylene Complex unit sewage Download PDFInfo
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Abstract
The present invention relates to the treatment for reuse method of oil refining-Ethylene Complex unit sewage, comprising: (1) refinery basic sewage waste water carries out wet oxidation, SBR process successively; (2) ethene alkaline sewage is after wet oxidation process, waste water after processing with recirculated cooling water sewer and step (1) mixes, combined sewage after BAF, advanced oxidation and BAF process, mixes with acidic and alkaline waste water successively, discharge; (3) waste water of salts contg≤500mg/L is mixed, successively after oil removal, air supporting, biochemistry, BAF process, carry out sterilization and filtration treatment, be then back to recirculating cooling water system.The present invention can increase substantially reusing sewage rate, and investment and running cost is lower, operational administrative is easy.
Description
Technical field
The present invention relates to the treatment for reuse method of oil refining-Ethylene Complex unit sewage.
Background technology
China is the country of a shortage of water resources, water resources ownership per capita about 2200 cubic metres, 1/4th of Jin You world mean number.Meanwhile, due to the growth of China's population, water requirement is close to the developed amount of water resources.
Petrochemical complex is one of five large high water consumption industries of China, and ethylene production water consumption is wherein particularly outstanding, and the production equipment of a set of annual output 1000000 tons of ethene need fetch water about 1,850 ten thousand tons/year, simultaneously sewer about 1,200 ten thousand tons/year.Huge water loss not only constrains China's Ethylene Development, and is the serious waste to water resources.By reuse after the sewage disposal of ethylene industry, not only can solve the problem of environmental pollution of externally discharged waste water, and significantly can reduce water intaking, be saving water resource, the inevitable requirement realizing Sustainable development.
The kind of sewage in ethylene plant is many, complicated component, and existing treatment process is mainly by all kinds of for ethylene plant sewage mixing, and then unification processes.At present, most ethylene plants still adopts " old three covers " the art breading combined sewage by oil removal, air supporting and biochemical composition, because high-concentration sewage is to the impact of biochemical system, use the sewage of " old three covers " art breading still stably can not reach national grade one discharge standard, more can not carry out reuse.Other enterprise individual carries out advanced treatment to sewage, can realize the part reuse of sewage, but its reusing sewage rate is also undesirable, and reusing sewage investment is large, running cost is high, without economic benefit.The measure that some oil refining enterprise take " shunting of removing contamination, dirty divide and rule ", makes high-concentration and low-concentration waste water be processed respectively, and overall treatment effect is better, but reusing sewage rate is still lower.The main purpose that oil refining enterprise takes " shunting of removing contamination, dirty divide and rule " avoids high-concentration sewage to the impact of biochemical system, enables the sewage after process stably reach the emission standard of country, not for the reuse of sewage.
In sum, ensure externally discharged waste water can stably reaching standard, simultaneously do not increase excessive cost again prerequisite under, the reclamation rate improving sewage is further an urgent demand of ethene enterprise.
In prior art, after all ethylene wastewater mixing, unification processes.Bring the problem that two main thus, one is the impact of high-concentration sewage to biochemical system, causes the effluent quality of biochemical system unstable, even likely causes sewage can not qualified discharge; Two is combined sewages after ethylene plant's " old three covers " art breading, and can not carry out reuse, although can realize the part reuse of sewage by increasing advanced treatment facility, reusing sewage rate is still undesirable and cost is too high.Contriver investigates and analyzes water supply, use water, sewage and the Sewage treatment systems of existing ethene enterprise all sidedly, proposes above-mentioned technical solution by lot of experiments.In the sewage of ethylene production, alkaline sewage and acidic and alkaline waste water account for 5% of sewage total amount, but saltiness accounts for more than 50% of sewage total salinity, and wherein the COD of acidic and alkaline waste water is very low, and the COD of alkaline sewage is very high.The alkaline sewage of high COD concentration and high saliferous separates by the present invention, is processed separately by the combination of oxidation style and biochemical process, finally realizes stably reaching standard discharge.In ethylene production, the circulating cooling water yield accounts for 96% of ethylene production total water consumption, and water withdrawal accounts for 70% of the total water withdrawal of ethylene production, and the requirement of recirculated cooling water to reuse water quality is lower.Other sewage (not comprising recirculated cooling water sewer) of ethylene production, salts contg is lower, although indivedual sewage COD concentration is higher, but after the mixing of these sewage, average COD is not high, by the treatment process of ethylene plant's routine, and one BAF treatment process can be increased, meet the reuse requirement of recirculated cooling water.Other sewage of ethylene production mix with recirculated cooling water sewer by the present invention, after ethylene plant's conventional sewage treatment process (" old three covers " technique) and BAF process, be back to recirculated cooling water sewer, thus significantly improve the reclamation rate of sewage in ethylene plant.
Compared with existing ethylene wastewater reuse technology, the present invention has the following advantages:
1. the reusing sewage rate of prior art is generally no more than 70%, and reusing sewage rate of the present invention can reach more than 70%, the highlyest can reach about 95%.In addition, the present invention can also avoid high-concentration sewage to the impact of biochemical system, realizes the stably reaching standard discharge of sewage.
2. prior art needs could realize reusing sewage by complicated desalinating process, and technical process is long, technical difficulty is large, and reliability is poor.The inventive method does not need to carry out desalting treatment to sewage, thus substantially reduces sewage recycling process flow process, make technology more simply, more reliable.
3. prior art needs to carry out to a large amount of combined sewages the reuse that advanced treatment could realize sewage, and technical difficulty is large, technical process is long, working cost is high, unreasonable economically.The present invention carries out dual treatment to sewage, drastically reduce the area difficult sewage quantity, and avoid complicated desalting treatment simultaneously, shorten technical process, therefore working cost is lower, more reasonable economically.
4. the difficulty of prior art is large, technical process length, complicated operation, floor space large, and the difficulty therefore implemented is larger.The present invention, owing to taking sewage dual treatment, drastically reduce the area difficult sewage quantity, avoids desalting treatment, only needs newly-built a small amount of facility (can utilize existing " old three covers " technique), therefore implements to be more prone to.
Summary of the invention
The invention provides a kind for the treatment of for reuse system and treatment for reuse method of sewage in ethylene plant, adopt this system and method, the reclamation rate of sewage in ethylene plant can be increased substantially, and investment and running cost is lower, operational administrative is easy, technically reliable.
The treatment for reuse system of sewage in ethylene plant, be made up of the first sewage treatment unit and the second sewage treatment unit and reusing sewage unit, first sewage treatment unit comprises wet oxidation reaction device, the first BAF, advanced oxidation reactor and the second BAF in order, and the second sewage treatment unit comprises oil trap, air flotation pool, biochemistry pool and the 3rd BAF in order; Wherein, the water outlet pipeline of the second sewage treatment unit and the inhalent siphon line of reusing sewage unit are connected, and the water outlet pipeline of reusing sewage unit and recirculating cooling water system are connected, and the inhalent siphon line of recirculated cooling water sewer pipeline and the first BAF is connected.
In preferred situation, recirculated cooling water sewer pipeline is also connected with the inhalent siphon line of the second sewage treatment unit.
A treatment for reuse method for sewage in ethylene plant, comprising:
(1) alkaline sewage is after wet oxidation process, mix with recirculated cooling water sewer, the COD≤2000mg/L of combined sewage, combined sewage is successively after the first BAF, advanced oxidation and the second BAF process, mix with acidic and alkaline waste water, discharge;
(2) waste water of salts contg≤500mg/L is mixed, successively after oil removal, air supporting, biochemistry, the 3rd BAF process, carry out sterilization and filtration treatment, be then back to recirculating cooling water system.
In preferred situation, alkaline sewage, after wet oxidation process, mixes with component loops cooling water drainage sewage; After the waste water of salts contg≤500mg/L mixes with another part recirculated cooling water sewer, then process.
In preferred situation, in step (1), alkaline sewage, after wet oxidation process, mixes with recirculated cooling water sewer, makes the COD of combined sewage be 1500 ~ 2000mg/L.
Described wet oxidation (Wet Oxidation, abbreviation WO) belongs to prior art, and its common reaction conditions is: temperature 120 ~ 350 DEG C, pressure 0.5 ~ 22MPa, residence time 15min ~ 120min.
Described BAF (Biological Aerated Filter, abbreviation BAF) belong to prior art, the present invention can adopt conventional BAF, and the preferred inorganic filtrate of filtrate, as clay, haydite, volcanics, zeolite, fly ash grain etc.
Described oil trap, air flotation pool and biochemistry pool belong to routine techniques.For the ethylene plant having " old three covers " technique, the technology and equipment of " old three covers " can be used.
Described reusing sewage unit is used for carrying out sterilization and filtration treatment to sewage.
Described advanced oxidation refers in oxidising process, can produce hydroxyl radical free radical.According to the difference of oxygenant used, need the pH value regulating waste water.When adopting ozone to make oxygenant, the pH value of waste water is 7 ~ 12, preferably 8 ~ 11.When adopting potassium permanganate, chlorine to make oxygenant, the pH value of waste water is 1 ~ 7, preferably 2 ~ 6.When adopting hydrogen peroxide, dioxide peroxide or clorox to make oxygenant, the pH value of waste water is 1 ~ 7, is preferably 2 ~ 6.Described advanced oxidation comprises catalyzed oxidation, and during as adopted hydrogen peroxide, dioxide peroxide or clorox to be oxygenant, also need to add catalyzer, described catalyzer can be selected from transition metal ion Fe
2+, Mn
2+, Ni
2+, Co
2+, Cd
2+, Cu
2+, Ag
+, Cr
3+and Zn
2+in one or more, also can be selected from metal oxide MnO
2, TiO
2and Al
2o
3in one or more.
Advanced oxidation treating processes of the present invention is preferably under agitation carried out, and can adopt churned mechanically method, also can adopt in aeration agitation or beat the method that pump around circuit carries out stirring.The time of oxidizing reaction can be 10 ~ 120 minutes, preferably 30 ~ 60 minutes.
Described advanced oxidation reactor refers to the reactor that can carry out advanced oxidation process to sewage, and it belongs to prior art.The present invention preferably adopts reaction tank, more preferably adopts the reaction tank with whipping device.Described whipping device refers to the equipment that can produce mixing effect, as anti-raw in mechanical stirring, aeration device or recycle pump etc.
In the present invention, one or more householder methods in photochemical catalysis, electrocatalysis, ultrasonically catalyzing, magnetic force catalysis also can be adopted to improve the effect of oxidizing reaction, as: adopt the modes such as light+hydrogen peroxide, light+ozone, electricity+hydrogen peroxide to process waste water.
Present invention also offers the treatment for reuse method of a kind of oil refining-Ethylene Complex unit sewage, comprising:
(1) refinery basic sewage waste water carries out wet oxidation, SBR process successively;
(2) ethene alkaline sewage is after wet oxidation process, waste water after processing with recirculated cooling water sewer and step (1) mixes, make the COD≤2000mg/L of combined sewage, combined sewage is successively after the first BAF, advanced oxidation and the second BAF process, mix with acidic and alkaline waste water, discharge;
(3) waste water of salts contg≤500mg/L is mixed, successively after oil removal, air supporting, biochemistry, the 3rd BAF process, carry out sterilization and filtration treatment, be then back to recirculating cooling water system.
In preferred situation, ethene alkaline sewage is after wet oxidation process, and the waste water after processing with recirculated cooling water sewer partly and step (1) mixes; After the waste water of salts contg≤500mg/L mixes with another part recirculated cooling water sewer, then process.
In preferred situation, in step (2), ethene alkaline sewage is after wet oxidation process, and the waste water after processing with recirculated cooling water sewer and step (1) mixes, and makes the COD of combined sewage be 1500 ~ 2000mg/L.
Present invention also offers the treatment for reuse method of another kind of oil refining-Ethylene Complex unit sewage, comprising:
(1) refinery basic sewage waste water is mixed with ethene alkaline sewage, after wet oxidation process, mix with recirculated cooling water sewer again, make the COD≤2000mg/L of combined sewage, combined sewage is successively after the first BAF, advanced oxidation and the second BAF process, mix with acidic and alkaline waste water, discharge;
(2) waste water of salts contg≤500mg/L is mixed, successively after oil removal, air supporting, biochemistry, the 3rd BAF process, carry out sterilization and filtration treatment, be then back to recirculating cooling water system.
In preferred situation, refinery basic sewage waste water is mixed with ethene alkaline sewage, after wet oxidation process, mix with the recirculated cooling water sewer of part; After the waste water of salts contg≤500mg/L mixes with another part recirculated cooling water sewer, then process.
In preferred situation, in step (1), refinery basic sewage waste water is mixed with ethene alkaline sewage, after wet oxidation process, then mix with recirculated cooling water sewer, make the COD of combined sewage be 1500 ~ 2000mg/L.
SBR belongs to prior art, is again continuous batch bio-reactor, interval activated sludge reactor, has the feature of plug-flow, anaerobic-aerobic operation, brief water inlet concurrently, is a kind of simple and easy, low consumption and sewage-treating reactor fast.
Described oil refining-Ethylene Complex unit refers to that oil refining apparatus and ethylene unit share a set of general facilities, as common recycle water system and steam system etc.
Accompanying drawing explanation
Fig. 1 is the Sewage treatment systems schematic diagram of comparative example 1.
Fig. 2 is the Sewage treatment systems schematic diagram of embodiment 1.
Fig. 3 is the Sewage treatment systems schematic diagram of comparative example 2.
Fig. 4 is the Sewage treatment systems schematic diagram of embodiment 2.
Fig. 5 is the Sewage treatment systems schematic diagram of comparative example 3.
Fig. 6 is the Sewage treatment systems schematic diagram of embodiment 3.
Fig. 7 is the Sewage treatment systems schematic diagram of embodiment 4.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing.
As shown in Figure 2, one embodiment of the present invention are: in sewage in ethylene plant, the hyposaline waste water of all saltiness≤500mg/L mixes with component loops cooling water drainage sewage, enter oil trap successively, air flotation pool, biochemistry pool, the 3rd BAF process, sewage after process enter reusing sewage unit carry out sterilization, filter after, enter circulating water cooling system; Ethylene plant's alkaline sewage is after wet oxidation process, mix with another part recirculated cooling water sewer, successively through the first BAF, catalyzed oxidation (one of advanced oxidation) and the second BAF process, discharge after the sewage after process mixes with acidic and alkaline waste water.
As shown in Figure 6, another two kinds of embodiments of the present invention are: in sewage in ethylene plant, the hyposaline waste water of all saltiness≤500mg/L enters oil trap successively, air flotation pool, biochemistry pool, the 3rd BAF process, sewage after process enter reusing sewage unit carry out sterilization, filter after, enter circulating water cooling system; Ethylene plant's alkaline sewage is after wet oxidation process, mix with recirculated cooling water sewer, successively through the first BAF, catalyzed oxidation (one of advanced oxidation) and the second BAF process, discharge after the sewage after process mixes with acidic and alkaline waste water.
Further illustrate the present invention by the following examples.
Comparative example 1
The large-scale ethylene producing device of certain throughput 1,000,000 t/a, uses the surface water of saliferous 150mg/L, water intaking 1,850 ten thousand m
3/ a, wherein recirculating cooling water system water intaking 1,400 ten thousand m
3/ a.Total sewer 1,200 ten thousand m
3/ a, wherein alkaline sewage 120,000 m of saliferous 22000mg/L, COD20000-50000mg/L
3acidic and alkaline waste water 300,000 m of/a, saliferous 48000mg/L
3recirculating cooling water system sewer 2,200,000 m of/a, saliferous 1250mg/L
3/ a, the waste water that other saliferous are less than 500mg/L amounts to 9,380,000 m
3/ a.
As shown in Figure 1, all waste water is mixed, carry out oil removal-air supporting-biochemical treatment, water outlet saltiness is 2040mg/L, COD<100mg/L, saltiness and COD amount all exceed recirculated water reuse index request (saltiness≤1200mg/L, COD≤60mg/L), can not direct reuse.
Embodiment 1
The situation of ethylene producing device and various sewage is identical with comparative example 1.
As shown in Figure 2, alkaline sewage, acidic and alkaline waste water and component loops cooling water drainage sewage are cut out from Waste Water Treatment; 120000 m
3the alkaline sewage of/a after wet oxidation process, with 800,000 m
3/ a recirculated cooling water sewer mixing, mixed COD<1000mg/L, combined sewage adopt " BAF+ catalyzed oxidation+BAF " art breading, water outlet again with 300,000 m
3discharge after the acidic and alkaline waste water mixing of/a, the COD<60mg/L of sewage effluent, water quality reaches National Environmental first discharge standard; Wherein, after first time BAF process, the B/C<0.3 of sewage, COD<200mg/L.
Saliferous is less than 9,380,000 m of 500mg/L
3/ a waste water and 1,400,000 m
3/ a recirculating cooling water system sewer mixes, after the Sewage treatment systems process in comparative example 1, adopt BAF art breading again, water outlet saltiness <1200mg/L, COD<60mg/L, after sterilization, filtering, fully recovering circulating water system, reusing sewage rate is 89.8%.
Comparative example 2
The large-scale petroleum chemical joint venture of certain oil-refining capacity 1,000 ten thousand t/a, ethylene production capacity 800,000 t/a, uses the surface water of saliferous 250mg/L, water intaking 2,150 ten thousand m
3/ a, wherein recirculating cooling water system water intaking 1,450 ten thousand m
3/ a.Total sewer 1,250 ten thousand m
3/ a, wherein refinery basic sewage waste water 1.4 ten thousand m of saliferous 300000mg/L, COD150000-200000mg/L
3/ a, ethene alkaline sewage 8.6 ten thousand m of saliferous 45000mg/L, COD30000-70000mg/L
3acidic and alkaline waste water 430,000 m of/a, saliferous 46000mg/L
3recirculating cooling water system sewer 3,500,000 m of/a, saliferous 1800mg/L
3/ a, other saliferous are less than waste water 8,470,000 m of 500mg/L
3/ a.
As shown in Figure 3, all waste water is mixed, carry out oil removal-air supporting-biochemical treatment, water outlet saliferous is 2770mg/L, COD<100mg/L, saltiness and COD amount all exceed recirculated water reuse index request (saltiness≤1200mg/L, COD≤60mg/L), can not direct reuse.
Embodiment 2
The situation of production equipment and various sewage is identical with comparative example 2.
As shown in Figure 4, refinery basic sewage waste water, ethene alkaline sewage, acidic and alkaline waste water and component loops cooling water drainage sewage are cut out from Waste Water Treatment, 1.4 ten thousand m that will process through " wet oxidation+SBR "
3/ a refinery basic sewage waste water, 8.6 ten thousand m through wet oxidation process
31,500,000 m of/a ethene alkaline sewage and saliferous 1800mg/L
3/ a recirculating cooling water system sewer merge, adopt " BAF+ catalyzed oxidation+BAF " technique process, water outlet again with 430,000 m
3discharge after/a acidic and alkaline waste water merges, the COD<60mg/L of sewage effluent, water quality reaches National Environmental first discharge standard; Wherein, after first time BAF process, the B/C of sewage is 0.1-0.3, COD<200mg/L.
Saliferous is less than 8,470,000 m of 500mg/L
3/ a waste water and 2,000,000 m
3the blowdown of/a recirculating cooling water system mixes, after the Sewage treatment systems process in comparative example 2, adopt BAF art breading again, water outlet saltiness <1200mg/L, COD<60mg/L, after sterilization, filtering, fully recovering circulating water system, reusing sewage rate is 83.8%.
Comparative example 3
The ethylene producing device of certain throughput 300,000 t/a, uses the surface water of saliferous 450mg/L, water intaking 6,800,000 m
3/ a, wherein recirculating cooling water system water intaking 4,800,000 m
3/ a.Total sewer 3,500,000 m
3/ a, wherein alkaline sewage 4.5 ten thousand m of saliferous 30000mg/L, COD40000-80000mg/L
3acidic and alkaline waste water 110,000 m of/a, saliferous 50000mg/L
3recirculating cooling water system sewer 800,000 m of/a, saliferous 3200mg/L
3/ a, the waste water that other saliferous are less than 500mg/L amounts to 254.5 ten thousand m
3/ a.
As shown in Figure 5, all waste water is mixed, carry out oil removal-air supporting-biochemical treatment, water outlet saltiness is 3050mg/L, COD<100mg/L, saltiness and COD amount all exceed recirculated water reuse index request (saltiness≤1200mg/L, COD≤60mg/L), can not direct reuse.
Embodiment 3
The situation of ethylene producing device and various sewage is identical with comparative example 3.
As shown in Figure 6, alkaline sewage, acidic and alkaline waste water and component loops cooling water drainage sewage are cut out from Waste Water Treatment; 4.5 ten thousand m
3/ a alkaline sewage after wet oxidation process, with 800,000 m
3/ a recirculating cooling water system sewer mix, mixed COD<2000mg/L, combined sewage adopt " BAF+ catalyzed oxidation+BAF " art breading, water outlet again with 110,000 m
3discharge after the mixing of/a acidic and alkaline waste water, the COD<60mg/L of sewage effluent, water quality reaches National Environmental first discharge standard; Wherein, after first time BAF process, the B/C of sewage is 0.1-0.4, COD<200mg/L.
Saliferous is less than 254.5 ten thousand m of 500mg/L
3/ a waste water after the Sewage treatment systems process of comparative example 3, then adopts BAF art breading, water outlet saltiness <1200mg/L, COD<60mg/L, after sterilization, filtering, fully recovering circulating water system, reusing sewage rate is 72.7%.
Embodiment 4
The situation of production equipment and various sewage is identical with comparative example 2.
As shown in Figure 7, refinery basic sewage waste water, ethene alkaline sewage, acidic and alkaline waste water and component loops cooling water drainage sewage are cut out from Waste Water Treatment, 1.4 ten thousand m
3/ a refinery basic sewage waste water and 8.6 ten thousand m
3/ a ethene alkaline sewage mixes, after wet oxidation process, with 1,500,000 m of saliferous 1800mg/L
3/ a recirculating cooling water system sewer merge, adopt " BAF+ catalyzed oxidation+BAF " technique process, water outlet again with 430,000 m
3discharge after/a acidic and alkaline waste water merges, the COD<60mg/L of sewage effluent, water quality reaches National Environmental first discharge standard; Wherein, after first time BAF process, the B/C<0.4 of sewage, COD<200mg/L.
Saliferous is less than 8,470,000 m of 500mg/L
3/ a waste water and 2,000,000 m
3the blowdown of/a recirculating cooling water system mixes, after the Sewage treatment systems process in comparative example 2, adopt BAF art breading again, water outlet saltiness <1200mg/L, COD<60mg/L, after sterilization, filtering, fully recovering circulating water system, reusing sewage rate is 83.8%.
Claims (12)
1. a treatment for reuse method for oil refining-Ethylene Complex unit sewage, comprising:
(1) refinery basic sewage waste water carries out wet oxidation, SBR process successively;
(2) ethene alkaline sewage is after wet oxidation process, waste water after processing with recirculated cooling water sewer and step (1) mixes, make the COD≤2000mg/L of combined sewage, combined sewage is successively after the first BAF, advanced oxidation and the second BAF process, mix with acidic and alkaline waste water, discharge;
(3) waste water of salts contg≤500mg/L is mixed, successively after oil removal, air supporting, biochemistry, the 3rd BAF process, carry out sterilization and filtration treatment, be then back to recirculating cooling water system.
2. in accordance with the method for claim 1, it is characterized in that, ethene alkaline sewage is after wet oxidation process, and the waste water after processing with recirculated cooling water sewer partly and step (1) mixes; After the waste water of salts contg≤500mg/L mixes with another part recirculated cooling water sewer, then process.
3. in accordance with the method for claim 1, it is characterized in that, in step (2), ethene alkaline sewage is after wet oxidation process, waste water after processing with recirculated cooling water sewer and step (1) mixes, and makes the COD of combined sewage be 1500 ~ 2000mg/L.
4. in accordance with the method for claim 1, it is characterized in that, when carrying out advanced oxidation process to sewage, adopt ozone make oxygenant and regulate the pH value of waste water to be 7 ~ 12.
5. in accordance with the method for claim 1, it is characterized in that, when carrying out advanced oxidation process to sewage, adopt potassium permanganate or chlorine make oxygenant and regulate the pH value of waste water to be 1 ~ 7.
6. in accordance with the method for claim 1, it is characterized in that, when carrying out advanced oxidation process to sewage, adopt hydrogen peroxide, dioxide peroxide or clorox to make oxygenant, regulate the pH value of waste water be 1 ~ 7 and add catalyzer, described catalyzer is selected from transition metal ion Fe
2+, Mn
2+, Ni
2+, Co
2+, Cd
2+, Cu
2+, Ag
+, Cr
3+and Zn
2+in one or more, or be selected from metal oxide MnO
2, TiO
2and Al
2o
3in one or more.
7. a treatment for reuse method for oil refining-Ethylene Complex unit sewage, comprising:
(1) refinery basic sewage waste water is mixed with ethene alkaline sewage, after wet oxidation process, mix with recirculated cooling water sewer again, make the COD≤2000mg/L of combined sewage, combined sewage is successively after the first BAF, advanced oxidation and the second BAF process, mix with acidic and alkaline waste water, discharge;
(2) waste water of salts contg≤500mg/L is mixed, successively after oil removal, air supporting, biochemistry, the 3rd BAF process, carry out sterilization and filtration treatment, be then back to recirculating cooling water system.
8. in accordance with the method for claim 7, it is characterized in that, refinery basic sewage waste water is mixed with ethene alkaline sewage, after wet oxidation process, mix with the recirculated cooling water sewer of part; After the waste water of salts contg≤500mg/L mixes with another part recirculated cooling water sewer, then process.
9. in accordance with the method for claim 7, it is characterized in that, in step (1), refinery basic sewage waste water is mixed with ethene alkaline sewage, after wet oxidation process, then mix with recirculated cooling water sewer, make the COD of combined sewage be 1500 ~ 2000mg/L.
10. in accordance with the method for claim 7, it is characterized in that, when carrying out advanced oxidation process to sewage, adopt ozone make oxygenant and regulate the pH value of waste water to be 7 ~ 12.
11. in accordance with the method for claim 7, it is characterized in that, when carrying out advanced oxidation process to sewage, adopts potassium permanganate or chlorine make oxygenant and regulate the pH value of waste water to be 1 ~ 7.
12. in accordance with the method for claim 7, it is characterized in that, when carrying out advanced oxidation process to sewage, adopt hydrogen peroxide, dioxide peroxide or clorox to make oxygenant, regulate the pH value of waste water be 1 ~ 7 and add catalyzer, described catalyzer is selected from transition metal ion Fe
2+, Mn
2+, Ni
2+, Co
2+, Cd
2+, Cu
2+, Ag
+, Cr
3+and Zn
2+in one or more, or be selected from metal oxide MnO
2, TiO
2and Al
2o
3in one or more.
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| CN112850944B (en) * | 2020-12-23 | 2023-05-16 | 苏州清然环保科技有限公司 | Treatment method of ethylene waste caustic sludge wastewater |
| CN116081747A (en) * | 2021-10-31 | 2023-05-09 | 中国石油化工股份有限公司 | Method and device for treating ethylene waste alkali liquor |
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