CN102060403B - Sewage treatment process capable of recovering low-carbon hydrocarbons and low-carbon oxygen-containing organic matters - Google Patents
Sewage treatment process capable of recovering low-carbon hydrocarbons and low-carbon oxygen-containing organic matters Download PDFInfo
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- CN102060403B CN102060403B CN200910172576A CN200910172576A CN102060403B CN 102060403 B CN102060403 B CN 102060403B CN 200910172576 A CN200910172576 A CN 200910172576A CN 200910172576 A CN200910172576 A CN 200910172576A CN 102060403 B CN102060403 B CN 102060403B
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Abstract
The invention discloses a sewage treatment process capable of recovering low-carbon hydrocarbons and low-carbon oxygen-containing organic matters. The process comprises the following steps: delivering a sewage raw material subjected to heat exchange into a flash evaporation separation tank; delivering a separated gas mixture containing ethene, propylene and low-carbon oxygen-containing organic matters into an oxide removing tower to obtain a low-carbon organic matter flow and a low-carbon hydrocarbon (such as ethene and propylene) flow; and delivering a separated liquid mixture into a stripping tower to obtain pure water. The total methanol and dimethyl ether content in pure water obtained by the method is not more than 100ppm. The pure water meets the inflow water quality requirement of sewage water treatment plant, and at the same time, the low-carbon hydrocarbon matters and low-carbon oxygen-containing organic matters in sewage are recovered.
Description
Technical field
The invention belongs to sewage treatment area.Be particularly related to a kind of recovery low-carbon (LC) hydro carbons and the organic sewage treatment process of low-carbon oxygen-containing.
Background technology
Commercial run such as refining of petroleum, petrochemical complex tends to produce sewage, as not handling contaminate environment seriously in good time, and makes the resource loss that can effectively utilize.Produce alkene technology (MTO) by coal or natural gas via methyl alcohol and be in the technological development forward position in the world, have significantly competition potential.Under the higher situation of oil price in recent years, be about to step into the industrial applications stage by coal or natural gas via preparing light olefins from methanol in the world.
Because containing with ethene and propylene in the sewage that preparing low carbon olefinic hydrocarbon with methanol device (hereinafter to be referred as the MTO device) and follow up device olefin separation produce is master's multiple low-carbon (LC) (carbonatoms is 8 or is lower than 8) hydrocarbons and to contain with methyl alcohol and/or dme be master's multiple low-carbon oxygen-containing organism (carbonatoms is 8 or is lower than 8 in the molecule).If this sewage is not carried out pre-treatment, handle and directly be discharged to the sewage-farm, then can not satisfy sewage-farm feedwater quality requirement, can not guarantee that the normal operation in sewage-farm and final sewage of discharging outside the factory meet the requirements of the standard.It is again because of though these low-carbon (LC) hydrocarbons and low-carbon oxygen-containing organism are harmful to environment, but useful.Low-carbon (LC) hydrocarbons major part itself is exactly the moity of low-carbon alkene, and it is the staple product composition of preparing low carbon olefinic hydrocarbon with methanol device, also is the main charging composition of the follow up device olefin separation of preparing low carbon olefinic hydrocarbon with methanol device.And the low-carbon oxygen-containing organism is a useful raw material of producing low-carbon alkene, also is important chemical material.If contain low-carbon (LC) hydro carbons and the organic sewage of low-carbon oxygen-containing after pre-treatment; Can guarantee that methyl alcohol and two kinds of material gross weights of dme content are not more than 100ppm in resulting the purifying waste water; Can satisfy sewage-farm feedwater quality requirement, recycling of implement device process water can be reclaimed these low-carbon (LC) hydrocarbons and low-carbon oxygen-containing organism in the sewage again simultaneously; Then can turn harm into good; Avoid the waste of resource, both practiced thrift the raw material of producing low-carbon alkene, increased the raw material of olefin separation again.
CN101139118A discloses a kind of sewage treatment process that contains methyl alcohol and dme, overall embodiment such as Fig. 1 of this technology.In Fig. 1, contain the sewage of methyl alcohol and dme, through sump pump 1 pressurization, after the heat exchange of purifying waste water at the bottom of the tower of sewage-purify waste water interchanger 2 and stripping tower 3, get into stripping tower 3, heat strippings with steam through reboiler 7 at the bottom of the tower of stripping tower 3.The gas mixture that contains methyl alcohol that stripping tower 3 cats head produce gets into return tank 5 after water cooler 4 coolings; Boost through reflux pump 6; A part is returned stripping tower 3 cats head as backflow; The raw material that another part can be used as preparing low carbon olefinic hydrocarbon with methanol returns MTO device reaction part, but also carrying device is made other purposes outward.What come out at the bottom of stripping tower 3 towers is that methyl alcohol and two kinds of material gross weights of dme content are not more than purifying waste water of 100ppm, and delivers to outside the device after the sewage heat exchange that contains methyl alcohol and dme.
But when contain in the sewage that preparing low carbon olefinic hydrocarbon with methanol device and/or follow up device olefin separation produce some amount be master's multiple low-carbon (LC) (carbonatoms is 8 or is lower than 8) hydrocarbons with ethene and propylene the time; If adopt the disclosed a kind of sewage treatment process that contains methyl alcohol and dme of above-mentioned CN101139118A; In these sewage be that oxygen-bearing organic matters such as methyl alcohol that master's low-carbon (LC) hydrocarbons also can be in sewage and dme get into above-mentioned stripping tower together with ethene and propylene then, low-carbon (LC) hydrocarbons and low-carbon oxygen-containing organism come out to deliver to outside the device or as the raw material of MTO device from the stripping return tank of top of the tower as the stripping tower discharging then.Because the low-carbon (LC) hydrocarbons is in the same place with the low-carbon oxygen-containing organism all the time; If the raw material as the MTO device returns MTO device reaction part; Then main alkene such as ethene and propylene is in MTO device reaction device; Then cause unnecessary loss, and can add the coking rate of catalyzer in the piece MTO device reaction device, endanger not light because of polymerization and condensation reaction become other materials such as coke precursors.Again because of being that master's low-carbon (LC) hydrocarbons major part itself is exactly the staple product composition of preparing low carbon olefinic hydrocarbon with methanol device with ethene and propylene; It also is the main charging composition of the follow up device olefin separation of preparing low carbon olefinic hydrocarbon with methanol device; For avoiding the precious resources waste, also to reclaim it.Also surpass the gross weight of low-carbon (LC) hydrocarbons owing to low-carbon oxygen-containing organism gross weight in the sewage, a considerable number of.If will make full use of it; Return MTO device reaction part to it as the raw material of MTO device; Be that master's low-carbon (LC) hydrocarbons just can not get into the preparing low carbon olefinic hydrocarbon with methanol device with the low-carbon oxygen-containing organism together more then with ethene and propylene; And should before sewage gets into stripping tower, from sewage, separate it or come out from aqueous low-carbon oxygen-containing organism, to separate it before the back entering preparing low carbon olefinic hydrocarbon with methanol device at the stripping tower cat head, directly get into olefin separation as raw material.In addition, make other purposes outside the device,, also will further separate the low-carbon (LC) hydrocarbons with the low-carbon oxygen-containing organism as as Organic Chemicals if low-carbon (LC) hydrocarbons that comes out from the stripping return tank of top of the tower and low-carbon oxygen-containing organism are delivered to.But the disclosed a kind of sewage treatment process that contains methyl alcohol and dme of above-mentioned CN101139118A can not directly obtain not moisture from sewage and not contain the organic low-carbon (LC) hydrocarbons of low-carbon oxygen-containing.
Summary of the invention
The present invention be directed to prior art and shortcoming such as can not reclaim the low-carbon (LC) hydrocarbons in the sewage (mainly being ethene and propylene) and low-carbon oxygen-containing organism (mainly being methyl alcohol and/or dme); And provide a kind of to low-carbon (LC) hydrocarbons that includes components such as ethene, propylene and the treatment process that includes the organic sewage of low-carbon oxygen-containing of components such as methyl alcohol, dme, acetone and acetaldehyde; To guarantee that methyl alcohol and two kinds of material gross weights of dme content are not more than 100ppm in resulting the purifying waste water; Satisfy sewage-farm feedwater quality requirement, simultaneously these low-carbon (LC) hydrocarbons and low-carbon oxygen-containing organism in the sewage are reclaimed.
The present invention provides a kind of recovery low-carbon (LC) hydro carbons and the organic sewage treatment process of low-carbon oxygen-containing, and its process step comprises:
1) contains the organic sewage raw material of low-carbon (LC) hydro carbons and low-carbon oxygen-containing and after heat exchange, get into the flash separation jar; Flash separation jar service temperature is 5～100 ℃; Working pressure is 0.05～0.6MPa; Flash separation jar upper gaseous phase product gets into step 2), flash separation pot bottom liquid product gets into step 3);
2) from the charging of the flash separation jar upper gaseous phase product of step 1) as the oxide removal tower; After pressurization and heat exchange, get into the oxide removal tower; Oxide removal column overhead working pressure is 1.0～1.8MPa, is preferably 1.2～1.7Mpa, and temperature is 90 ℃～190 ℃ at the bottom of the oxide removal Tata; Be preferably 110～150 ℃; Oxide removal Tata bottom product is the logistics of low-carbon oxygen-containing organism, can be used as the raw material of MTO device or delivers to outside the device preferential raw material as the MTO device; The logistics that the oxide removal column overhead is come out gets into oxide removal tower return tank after cooling and condensation; The liquid phase of oxide removal tower return tank is returned the oxide removal column overhead as backflow, and the gas phase of oxide removal tower return tank is the low-carbon (LC) hydro carbons that contains ethene, propylene, delivers to the outer or preferential raw material entering olefin separation as olefin separation of device as product;
3) from the flash separation pot bottom liquid product of step 1) as the stripping tower charging; After heat exchange, get into stripping tower; The stripping tower overhead product is for containing the organic logistics of low-carbon oxygen-containing, can be used as the raw material of MTO device or delivers to outside the device, and stripper bottoms product is for purifying waste water.
Said contain low-carbon (LC) hydro carbons and the incoming stock water pot of the organic sewage raw material of low-carbon oxygen-containing after, heat exchange again gets into the flash separation jar afterwards.
Oxide removal tower return tank service temperature according to the invention is 2～35 ℃, is preferably 5～20 ℃, and the mole reflux ratio is 1～50.
Oxide removal tower of the present invention is divided into two sections, and cat head is a rectifying section to feed entrance, and feed entrance is a stripping section at the bottom of tower, and the oxide removal tower has 10～60 theoretical stages, and its opening for feed is opened from the 3-30 piece theoretical stage of cat head to the tower truth of a matter.
Said stripping tower charging is behind the charging water pump; Through heat exchange admission stripper; Methyl alcohol and two kinds of material gross weights of dme content were not more than 100ppm during stripper bottoms product was purified waste water; Purify waste water through purifying waste water pipeline to device, the pipeline of purifying waste water is provided with first by-pass line and communicates with stripping tower charging water pump, on this first by-pass line the first flow variable valve is set.The pipeline of purifying waste water is provided with second by-pass line and communicates with raw material water tank, on this second by-pass line second regulating valve is set.When come out at the bottom of the stripping Tata purify waste water in methyl alcohol and two kinds of material gross weights of dme content when being not more than 100ppm, the first flow variable valve and second regulating valve are in closing condition.When come out at the bottom of the stripping Tata purify waste water in methyl alcohol and two kinds of material gross weights of dme content during greater than 100ppm; Open the first flow variable valve and/or second regulating valve; Adjusting is through the flow and/or regulate the flow of purifying waste water through second regulating valve of purifying waste water of first flow variable valve, makes to go out methyl alcohol at the bottom of the stripping Tata and two kinds of material gross weights of dme content is not more than purifying waste water of 100ppm.
According to the inventionly contain the low-carbon (LC) hydro carbons and the organic sewage raw material of low-carbon oxygen-containing comes from MTO device and/or olefin separation.
Stripping tower according to the invention is the sewage stripping tower, and those skilled in the art can select as the case may be, as adopting disclosed sewage stripping tower among the patent CN101139118A.
Low-carbon (LC) hydro carbons according to the invention is made up of one or more different components in these 5 types of hydrocarbon the insides of naphthenic hydrocarbon of the aromatic hydrocarbons of the alkynes of the alkene of the alkane of low-carbon (LC), low-carbon (LC), low-carbon (LC), low-carbon (LC) and low-carbon (LC) any a type or the multiclass.
Necessarily contain ethylene component and/or propylene component in the low-carbon (LC) hydro carbons according to the invention.
The alkane of said low-carbon (LC) is that carbon number is C
1～C
8Between (comprise C
1And C
8) alkane, representational compound has methane, ethane and propane.The alkene of said low-carbon (LC) is that carbon number is C
2～C
5Between (comprise C
2And C
5) alkene, representational compound has ethene, propylene.The alkynes of said low-carbon (LC) is that carbon number is C
2～C
5Between (comprise C
2And C
5) alkynes, representational compound has acetylene and propine.The aromatic hydrocarbons of said low-carbon (LC) is that carbon number is C
6～C
8Between (comprise C
6And C
8) aromatic hydrocarbons, representational compound has benzene and toluene.The naphthenic hydrocarbon of said low-carbon (LC) is that carbon number is C
3～C
8Between (comprise C
3And C
8) naphthenic hydrocarbon, representational compound has Trimetylene.
Low-carbon oxygen-containing organism according to the invention is made up of one or more different components in these 6 types of oxygen-containing organic compounds the insides of ester of the aldehyde of the acid of the ketone of the ether of the alcohol of low-carbon (LC), low-carbon (LC), low-carbon (LC), low-carbon (LC), low-carbon (LC) and low-carbon (LC) any a type or the multiclass.
Necessarily contain methyl alcohol component and/or dme component in the low-carbon oxygen-containing organism according to the invention.
The alcohol of said low-carbon (LC) is C for carbon number
1～C
4Between (comprise C
1And C
4) alcohol, representational compound has methyl alcohol.The ether of said low-carbon (LC) is that carbon number is C
2～C
5Between (comprise C
2And C
5) ether, representational compound has dme.The ketone of said low-carbon (LC) is that carbon number is C
3～C
6Between (comprise C
3And C
6) ketone, representational compound has dimethyl ketone.The acid of said low-carbon (LC) is C for carbon number
1～C
4Between (comprise C
1And C
4) acid, representational compound has acetate.The aldehyde of said low-carbon (LC) is that carbon number is C
1～C
5Between (comprise C
1And C
5) aldehyde, representational compound has acetaldehyde.The ester of said low-carbon (LC) is that carbon number is C
2～C
5Between (comprise C
2And C
5) ester, representational compound has ETHYLE ACETATE.
A kind of recovery low-carbon (LC) hydro carbons of the present invention and the organic sewage treatment process of low-carbon oxygen-containing; Be specially adapted to handle the organic gross weight content of sewage, especially low-carbon (LC) hydro carbons and low-carbon oxygen-containing that converting methanol to prepare low carbon olefin (MTO) installs and/or olefin separation produces and be not more than 50% sewage.
The present invention compared with prior art has the following advantages:
1) technology according to the invention can be handled the sewage that MTO device and/or olefin separation produce, obtain after treatment purify waste water in methyl alcohol and two kinds of material gross weights of dme content be not more than 100ppm, satisfy sewage-farm feedwater quality requirement.
2) technology according to the invention can reclaim the main products component of MTO devices such as the ethene that is dissolved in the sewage and propylene, and the recovery of ethene and propylene all reaches more than 90%, and higher all can reach more than 95%, and Gao Junke reaches more than 99%.And what recovery obtained is master's low-carbon (LC) hydro carbons with ethene and propylene, does not contain water and low-carbon oxygen-containing organism, and they can be used as the raw material entering olefin separation of olefin separation further separates, and also can be used as other purposes.Technology outstanding feature according to the invention is that to avoid in the sewage be that master's low-carbon (LC) hydrocarbons is because of heavily advance in the MTO device reaction device to participate in reaction loss that causes and the harm that catalyzer is caused with ethene and propylene.
3) technology according to the invention can reclaim multiple low-carbon oxygen-containing organic constituentses such as methyl alcohol in the sewage, dme.The most of recovery of low-carbon oxygen-containing organic constituents can reach more than 90%, and higher reaches more than 95%, can reach more than 99%.The raw material that they both can be used as preparing low carbon olefinic hydrocarbon with methanol returns the MTO device, also can be used as other purposes.
4) technology according to the invention is told the low-carbon oxygen-containing organic constituents that low-carbon (LC) hydro carbons and boiling point are lower in the sewage because of adopting the flash separation jar from flash separation jar top, can reduce the steam consumption of the stripping tower of handling flash separation pot bottom sewage.Make that also the stripping tower operation is more steady.
5) technology according to the invention is because of being provided with bypass on the pipeline of purifying waste water, and flexible operation is strong to the low-carbon (LC) hydro carbons and the low-carbon oxygen-containing organism flexibility of various concentration in the sewage.
Specify the present invention through accompanying drawing and embodiment below, but do not limit the scope of the invention.
Accompanying drawing and description of drawings
Fig. 1 is the schema among the prior art CN101139118A.
Fig. 2 is a kind of simple process flow diagram of the present invention.
Reference numeral shown in Fig. 2 is:
1-MTO device sewer pipeline, 2-olefin separation sewer pipeline, 3-raw material water tank, 4-sump pump, 5-interchanger; The 11-compressor, 12-oxide removal tower feed exchanger, 13-oxide removal tower, 14-contain the low-carbon oxygen-containing organism pipeline of less water, 15-oxide removal tower condensing surface; 16-oxide removal tower return tank, 17-oxide removal tower reflux pump, 18-low-carbon (LC) hydro carbons pipeline, 19-oxide removal tower reboiler, 20-stripping tower charging water pump; 21-sewage-the interchanger of purifying waste water, 22-stripping tower, 23-stripping tower reboiler, 24-oxide gas water cooler, 25-stripping tower return tank; 26-stripping tower reflux pump, 27-low-carbon oxygen-containing organism pipeline, the 28-pipeline of purifying waste water, 29-first flow variable valve; 30-second regulating valve, 31-flash separation jar, 33-first by-pass line, 34-second by-pass line.
Embodiment
As shown in Figure 2; The sewage that comes from MTO device and olefin separation mixes through MTO device sewer pipeline 1 and olefin separation sewer pipeline 2 incoming stock water pots 3 respectively; Be not more than 50% sewage from the low-carbon (LC) hydrocarbons that includes components such as ethene, propylene of raw material water tank 3 and the low-carbon oxygen-containing organism that includes components such as methyl alcohol, dme, acetone and acetaldehyde and low-carbon (LC) hydrocarbons and low-carbon oxygen-containing organism gross weight content, through sump pump 4 carry with interchanger 5 heat exchange after entering flash separation jar 31.Flash separation jar 31 service temperatures are 5～100 ℃, and working pressure is 0.05～0.6Mpa.Flash separation jar 31 tops produce contains ethene, propylene and a spot of water and the organic gaseous mixture of low-carbon oxygen-containing gets into oxide removal tower 13 after compressor 11 pressurizations and 12 heat exchange of oxide removal tower feed exchanger.The liquid mixture that contains a small amount of low-carbon oxygen-containing organism and big water gaging of flash separation jar 31 bottoms generation gets into stripping tower 22 through 20 pressurizations of stripping tower charging water pump after the heat exchange of purifying waste water at the bottom of the tower of sewage-purify waste water interchanger 21 and stripping tower 22.
Said oxide removal tower 13 cat head working pressures are 1.0～1.8MPa, are preferably 1.2～1.7Mpa, and oxide removal tower 13 column bottom temperatures are 90 ℃～190 ℃, are preferably 110～150 ℃.
Said oxide removal tower 13 is divided into two sections, and cat head is a rectifying section to feed entrance, and feed entrance is a stripping section at the bottom of tower, and oxide removal tower 13 has 10～60 theoretical stages, and its opening for feed is opened from the 3-30 piece theoretical stage of cat head to the tower truth of a matter.
Said oxide removal tower return tank 16 service temperatures are 2～35 ℃, are preferably 5～20 ℃, and the mole reflux ratio is 1～50.
Heat strippings with steam through stripping tower reboiler 23 at the bottom of the tower of stripping tower 22.The organic gaseous mixture of low-carbon oxygen-containing that contains that stripping tower 22 cats head produce gets into stripping tower return tank 25 after 24 coolings of oxide gas water cooler; Boost through stripping tower reflux pump 26; A part is returned stripping tower 22 cats head as backflow; Another part is seen off through low-carbon oxygen-containing organism pipeline 27; The raw material that can be used as preparing low carbon olefinic hydrocarbon with methanol returns MTO device reaction part, but also carrying device is done other purposes outward, and preferentially the raw material as preparing low carbon olefinic hydrocarbon with methanol returns MTO device reaction part.
What come out at the bottom of stripping tower 22 towers is that methyl alcohol and two kinds of material gross weights of dme content are not more than purifying waste water of 100ppm, through sewage-purify waste water interchanger 21 cooling backs through purifying waste water pipeline 28 outside installing.The pipeline 28 of purifying waste water is provided with first by-pass line 33 and communicates with stripping tower charging water pump 20, on this first by-pass line 33 first flow variable valve 29 is set.The pipeline 28 of purifying waste water is provided with second by-pass line 34 and communicates with raw material water tank 3, and second regulating valve 30 is set on this second by-pass line 34.When come out at the bottom of stripping tower 22 towers purify waste water in methyl alcohol and two kinds of material gross weights of dme content when being less than or equal to 100ppm, the first flow variable valve 29 and second regulating valve 30 are in closing condition.When come out at the bottom of stripping tower 22 towers purify waste water in methyl alcohol and two kinds of material gross weights of dme content during greater than 100ppm; Open the first flow variable valve 29 and/or second regulating valve 30; Adjusting is through the flow and/or regulate the flow of purifying waste water through second regulating valve 30 of purifying waste water of first flow variable valve 29, makes to go out methyl alcohol at the bottom of the stripping Tata and two kinds of material gross weights of dme content is not more than purifying waste water of 100ppm.
Claims (6)
1. one kind is reclaimed low-carbon (LC) hydro carbons and the organic sewage treatment process of low-carbon oxygen-containing, it is characterized in that process step is:
1) contains the organic sewage raw material of low-carbon (LC) hydro carbons and low-carbon oxygen-containing and after heat exchange, get into the flash separation jar; Flash separation jar service temperature is 5～100 ℃; Working pressure is 0.05～0.6MPa; Flash separation jar upper gaseous phase product gets into step 2), flash separation pot bottom liquid product gets into step 3);
2) from the charging of the flash separation jar upper gaseous phase product of step 1) as the oxide removal tower; After pressurization and heat exchange, get into the oxide removal tower; Oxide removal column overhead working pressure is 1.0～1.8MPa; Temperature is 90 ℃～190 ℃ at the bottom of the oxide removal Tata, and oxide removal Tata bottom product is the logistics of low-carbon oxygen-containing organism, as the raw material of MTO device or deliver to outside the device; The logistics that the oxide removal column overhead is come out gets into oxide removal tower return tank after cooling and condensation; The liquid phase of oxide removal tower return tank is returned the oxide removal column overhead as backflow, and the gas phase of oxide removal tower return tank is the low-carbon (LC) hydro carbons that contains ethene, propylene, and it is outer or as the raw material of olefin separation to deliver to device as product; Said oxide removal tower is divided into two sections, and cat head is a rectifying section to feed entrance, and feed entrance is a stripping section at the bottom of tower, and the oxide removal tower has 10～60 theoretical stages, and its opening for feed is opened from the 3-30 piece theoretical stage of cat head to the tower truth of a matter;
3) from the flash separation pot bottom liquid product of step 1) as the stripping tower charging; After heat exchange, get into stripping tower; The stripping tower overhead product is for containing the organic logistics of low-carbon oxygen-containing, and as the raw material of MTO device or deliver to outside the device, stripper bottoms product is for purifying waste water.
2. technology according to claim 1 is characterized in that: step 2) in oxide removal column overhead working pressure be 1.2～1.7MPa, temperature is 110～150 ℃ at the bottom of the oxide removal Tata.
3. technology according to claim 1 is characterized in that: behind the incoming stock water pot of said sewage raw material, heat exchange again gets into the flash separation jar afterwards.
4. technology according to claim 1 is characterized in that: said oxide removal tower return tank service temperature is 2～35 ℃, and the mole reflux ratio is 1～50.
5. technology according to claim 4 is characterized in that: said oxide removal tower return tank service temperature is 5～20 ℃.
6. technology according to claim 1; It is characterized in that: the stripping tower charging is behind the charging water pump; Through heat exchange admission stripper; Purify waste water through purifying waste water pipeline to device, the pipeline of purifying waste water is provided with first by-pass line and communicates with stripping tower charging water pump, on this first by-pass line the first flow variable valve is set; Behind the incoming stock water pot of sewage raw material, heat exchange again gets into the flash separation jar afterwards, and the pipeline of purifying waste water is provided with second by-pass line and communicates with raw material water tank, on this second by-pass line second regulating valve is set.
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| CN200910172576A CN102060403B (en) | 2009-11-17 | 2009-11-17 | Sewage treatment process capable of recovering low-carbon hydrocarbons and low-carbon oxygen-containing organic matters |
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| CN200910172576A CN102060403B (en) | 2009-11-17 | 2009-11-17 | Sewage treatment process capable of recovering low-carbon hydrocarbons and low-carbon oxygen-containing organic matters |
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| Title |
|---|
| JP特开2006-205135A 2006.08.10 |
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| CN102060403A (en) | 2011-05-18 |
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