CN106517510A - Activated-sludge treatment method for electric desalting wastewater - Google Patents
Activated-sludge treatment method for electric desalting wastewater Download PDFInfo
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Abstract
The invention discloses an activated-sludge treatment method for electric desalting wastewater. The method comprises the following steps: (1) enabling the electric desalting wastewater to be in contact with an activated-sludge-containing material under the condition of hypoxic treatment, so as to carry out hypoxic treatment on the electric-desalting wastewater; (2) subjecting the mixture, obtained after contact, to aerobic treatment; and (3) returning part of the mixed material, which is subjected to the aerobic treatment, to the step (1) to be served as part of the activated-sludge-containing material, wherein the particle size of at least 60wt% of activated sludge in the part of the mixed material, which is subjected to the aerobic treatment, returned to the step (1) is not greater than 1mm. According to the technical scheme of the invention, the degradation and nitration efficacy of refractory organics in the electric-desalting wastewater is promoted, and the adding of agents and the strengthening of aeration of an aerobic tank are not required; and the method has the advantages of low operating cost and no byproduct.
Description
Technical field
The present invention relates to a kind of activated sludge treatment method of electro-desalting waste water.
Background technology
Existing more ripe electro-desalting wastewater processing technology typically adopts single-stage or two-stage air supporting dirty with activity
The combined treatment process of mud.A/O (anoxia/aerobic) techniques so which is stable, Operation and Maintenance simple,
Can the effective advantage such as denitrogenation first-selected technique always as electro-desalting biological wastewater treatment.
By taking desalting in oil refinery waste water as an example, petroleum substance content is up to 500mg/L or more, its Jing
After multiple-unit oil removing pretreatment, into A/O techniques raw water still containing a certain amount of colloidal type dispersed oil and
Oil emulsion, so that occur situation that these tiny oil droplets are adsorbed on active pollution index, coated.This
One side causes sludge mass transfer to be obstructed, activity is relatively low, on the other hand can produce a large amount of oil-containing excess sludges.
Due to desalting in oil refinery waste water toxic, the presence of persistent organic pollutants, remaining dirt certainly will be caused
The organic toxicity of restriction of mud.For desalting in oil refinery biological wastewater treatment residue biological sludge yield it is big,
Organic toxicity is high, it is difficult to the problem of recycling, often carries out useless process of endangering, or burning disposal at present.
Both processing modes all have that energy consumption is wasted and brings notable risk to environment.
Therefore, by the Optimal improvements of A/O processes, sludge Sources decreasing and toxicity source abatement is realized,
It is the primary selection for solving the problems, such as to refine oil electro-desalting waste water excess sludge.At present, conventional sludge source subtracts
Amount method be carry out aoxidizing by uncoupler in systems or ozone, using means such as supercritical ultrasonics technologies
It is back in Aeration tank after excess sludge is cracked and is degraded by microorganisms, reduce on source residue so as to reaches
The purpose of sludge yield, but these methods there are problems that secondary pollution, be difficult to control to, operating cost.
The tiny oil droplets remained in desalting in oil refinery waste water are adsorbed on active pollution index, are coated, and enter
And cause substrate (organic substrates or ammonia nitrogen etc.) difficult to sludge flco active region mass transfer, Aerobic Pond (O
Pond) dissolved oxygen (DO) be obstructed to sludge flco internal mass transfer, cause sludge activity low, and detest
Denitrifying carbon source in oxygen pond (A ponds) is not enough so that electro-desalting water treatment effect is reduced.For this
One problem, in existing engineer applied, usually through the air aeration intensity in reinforcing O ponds solving the problem.
The energy consumption of air aeration certainly will be so caused to waste.
The content of the invention
The invention aims to overcome above-mentioned front defect, there is provided one kind can improve activated sludge work
Property, the carbon source of anoxic treatment, and do not result in secondary pollution, the activity of lower-cost electro-desalting waste water
Method for sludge treatment.
To achieve these goals, on the one hand, the invention provides a kind of activated sludge of electro-desalting waste water
Processing method, the method are comprised the following steps：(1) under the conditions of anoxic treatment, make electro-desalting waste water with
The contact of material containing activated sludge, carries out the anoxic treatment of electro-desalting waste water；(2) by gained after contact
Mixture carries out Aerobic Process for Treatment；(3) the mixed material return to step (1) after the Aerobic Process for Treatment of part is made
For the part material containing activated sludge, wherein, at least 60 weights in the material containing activated sludge
The particle diameter of the activated sludge of amount % is not more than 1mm, preferably 0.5-1mm.
Preferably, the mistake of step (1) is back to by the mixed material after the part Aerobic Process for Treatment
Cheng Zhong, carries out eddy flow process to the mixed material after the part Aerobic Process for Treatment, makes to be back to step (1)
In the part Aerobic Process for Treatment after mixed material at least activated sludge of 60 weight % particle diameter
No more than 1mm, the eddy flow are processed and are carried out in cyclone.It is highly preferred that what the eddy flow was processed
Condition causes velocity gradient of the mixed material after the part Aerobic Process for Treatment in cyclone to be not less than
1100S-1, preferably 2800-5600S-1。
Preferably, the method also includes, is passed through carbon dioxide, dioxy during Aerobic Process for Treatment is carried out
It is 0.25-1 that the intake of change carbon causes the volume ratio of the carbon dioxide and oxygen being passed through:1.
Above-mentioned technical proposal of the invention, by the aerobic place in part that will be back in step (1)
The size controlling of at least activated sludge of 60 weight % in the mixed material after reason in no more than 1mm,
In the range of preferably 0.5-1mm, release can the organic matter exposure such as polysaccharide and protein in sludge
Put, the organic carbon source in anoxic treatment is supplemented with the mixed material, it is anti-during raising anoxic treatment
Nitrification denitrification efficiency；And in the case of preferably by eddy flow process, fluid shearing is carried out, sludge is made
The little oil droplet on surface is further discharged, and the activity of sludge is effectively improved, and enhances sludge
The mass-transfer performance at interface, promotes hardly degraded organic substance degraded and the efficiency for nitrifying in electro-desalting waste water.Cause
This, the present invention need not add the aeration in medicament and reinforcing O ponds, no coupling product low with operating cost
Advantage.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific embodiment
Hereinafter the specific embodiment of the present invention is described in detail.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explains the present invention, is not limited to the present invention.
In the following description of the present invention, the term " hydraulic detention time " for using refers to pending electro-desalting
Mean residence time of the waste water in reactor, that is, electro-desalting waste water and microbial action in reactor
Average reaction time, therefore, if the dischargeable capacity of reactor be V (m3), water velocity is Q
(m3/ h), then：Hydraulic detention time (HRT)=V/Q, i.e. hydraulic detention time is equal to reactor
The ratio of dischargeable capacity and water velocity.
" COD " i.e. COD, is to represent a how many index of reducing substanceses in water, COD
Value is bigger, illustrates all of COD value that water body is more serious by the pollution of Organic substance, is related in the present invention
It is the numerical value that potassium dichromate oxidation (GB11914-89) is measured.
The amount of the nitrogen that " ammonia-nitrogen content " is present with free ammonia and ammonium ion form in referring to every liter of water, abbreviation
For NH4 +-N。
" total nitrogen level " is abbreviated as TN in terms of the nitrogenous milligram number of every liter of water.
On the one hand, the invention provides a kind of activated sludge treatment method of electro-desalting waste water, the method bag
Include following steps：(1) under the conditions of anoxic treatment, electro-desalting waste water is made to connect with the material containing activated sludge
Touch, carry out the anoxic treatment of electro-desalting waste water；(2) mixture of gained after contact is carried out into Aerobic Process for Treatment；
(3) the mixed material return to step (1) after the Aerobic Process for Treatment of part is contained into activated sludge as part is described
Material, wherein, be back in the mixed material after the part Aerobic Process for Treatment in step (1)
The particle diameter of at least activated sludge of 60 weight % is not more than 1mm, preferably 0.5-1mm.
Hereinafter, " mixed material after the part Aerobic Process for Treatment in step (1) will be back to "
Together simply referred to as " backflow ".
It was found by the inventors of the present invention that crushing to the activated sludge in the backflow, and make which
In the particle diameter of at least activated sludge of 60 weight % be not more than 1mm, preferably 0.5-1mm, Neng Gouyou
The organic matters such as exocytosiss polysaccharide and protein in effect release sludge, and as organic carbon source in A ponds
Recycle.In addition, the broken removing for being accompanied by the oil phase wrapped up by sludge of sludge, the work after removing oil
Property free flora can form high activity sludge in biological treatment process of the A ponds to O ponds again, with strong
The biochemical activity of change system, can effectively in sludge Sources decreasing, and accelerating system biochemical activity, from
And complete the present invention.
According to the present invention, in situations where it is preferred, activity whole in the material containing activated sludge is dirty
The particle diameter of mud is not more than 2mm.
Although by the backflow, at least the size controlling of the activated sludge of 60 weight % is being not more than
1mm, preferably 0.5-1mm are capable of achieving the purpose of the present invention.But it is it was found by the inventors of the present invention that logical
Overwinding stream process cause the particle diameter of at least activated sludge of 60 weight % in the backflow to be not more than 1mm,
Preferably 0.5-1mm, that is, the mixed material after the part Aerobic Process for Treatment is back to step (1)
During, eddy flow process is carried out to the mixed material after the part Aerobic Process for Treatment, makes to be back to step
Suddenly the activated sludge of at least 60 weight % in the mixed material after the part Aerobic Process for Treatment in (1)
Particle diameter be not more than 1mm, the performance of sludge can be made to be further enhanced.The eddy flow processes excellent
Carry out in being selected in cyclone, in order to realize above-mentioned requirements, the condition that the eddy flow is processed causes the mixing
Velocity gradient of the material in cyclone is preferably not less than 1100S-1, more preferably 2800-5600S-1。
Although by the velocity gradient control of the mixed material in cyclone being within the scope of the invention
The goal of the invention of the present invention can be effectively realized.But it was found by the inventors of the present invention that by eddy flow is processed
Condition carry out following control, the exocytosiss in sludge in the mixed material of Jing process more can have
The release of effect ground, and be more conducive to the thalline that activated sludge discharges and form highly active sludge wadding again
Body.The condition that the eddy flow is processed is preferably included：Intake port with the cyclone is as 0.02-0.04m
On the basis of, the feed flow rate of cyclone is 1-8m/s, and charging aperture pressure is not less than 0.03MPa；The rotation
The charging aperture pressure of stream device is more than discharging opening pressure, and pressure differential is 0.03-0.15MPa.The present invention needs to refer to
Bright, the intake port increase of the cyclone, the charging rate of the backflow will reduce, press
Power will reduce.
According to the present invention, during the backflow is processed in cyclone, also include to described
Backflow carries out overflow, and the flow of the overflow is 2-5 volumes % of the backflow feed rate.It is logical
The flow for controlling the overflow is crossed, can effectively ensure speed ladder of the backflow in cyclone
Degree, so that the particle diameter of at least activated sludge of 60 weight % is not more than 1mm in the backflow,
Preferably 0.5-1mm.
According to the present invention, methods described also includes removing the tiny oil droplets come off after eddy flow is processed, to realize
The separation of profit, so that reduce the oil content of water outlet.The method according to the invention, the tiny oil droplets for coming off
Can be separated from the water under Strong shear stress in cyclone, so as to arrange from the overfall of cyclone
Go out.Herein it should be noted that when the backflow when containing Chuck Steak, needs are collected separately from overfall
The overflowing liquid of discharge, returns again to after oil removing into step (1)；When the backflow oil-containing is less,
The overflowing liquid discharged from overfall can be returned directly in step (1).
Present inventor have further discovered that, by being passed through carbon dioxide during Aerobic Process for Treatment, and
The intake of carbon dioxide is controlled so that the carbon dioxide being passed through is 0.25-1 with the volume ratio of oxygen:1, it is excellent
Select 0.5-1:1, the amino nitrogen of electro-desalting waste water that can be after further reduction is processed, nitrate and total nitrogen
Content.Wherein, the oxygen only refers to what is be additionally passed through with the carbon dioxide in the volume ratio of carbon dioxide
The amount of carbon dioxide.Wherein, oxygen and being passed through for carbon dioxide can be entered using method well known in the art
OK, the present invention will not be described here.
Although the method for the present invention can be applied to various electro-desalting waste water, the present inventor sends out
Existing, method of the invention is particularly suitable for COD value is 1500-2500mg/L, NH4 +- N is
60-100mg/L, NO3 -- N is 0-10mg/L, preferably 8-12mg/L, and the content of total nitrogen is 100-200
Mg/L, the content of petroleum substance is 800-1500mg/L, and the content of float (SS) is
200-400mg/L, the content of sulfide is 15-25mg/L, and basicity (with calcium carbonate) is
150-300mg/L, pH value are processed for the electro-desalting waste water of 7.5-9.5.It is highly preferred that of the invention
Method be particularly suited for oil plant discharge electro-desalting waste water.
Wherein, term " petroleum substance " refers to the nytrons such as alkane, aromatic hydrocarbons, asphalitine, colloid
Thing.
According to the present invention, in hypoxic/anaerobic technique, when the backflow in return to step (1)
When the ratio for carrying out the flow of the former electro-desalting waste water of anoxic treatment in flow and step (1) is 2-4,
Being capable of notable decrement discharge sludge by the broken sludge flco of backflow.The portion in return to step (1)
The former electro-desalting for carrying out anoxic treatment in the flow of the mixed material after point Aerobic Process for Treatment and step (1) is useless
The ratio of the flow of water is referred to as " internal reflux ratio " or " return current ratio of the mixed liquid ".Wherein, described " former electricity
Desalinization wastewater " is the electro-desalting waste water for initially carrying out anoxic treatment.
In the present invention, the condition of anoxic treatment and Aerobic Process for Treatment can be the condition of this area routine employing,
The condition of the anoxic treatment is preferably included：Dissolved oxygen is less than 1mg/L (such as 0.5-1mg/L), temperature
For 10-40 DEG C, hydraulic detention time is 2-6h.The condition of the Aerobic Process for Treatment is preferably included：Dissolved oxygen
For 2-4mg/L, temperature is 10-40 DEG C, and hydraulic detention time is 8-16h.
In the present invention, anoxic treatment and Aerobic Process for Treatment series connection are carried out, and do not have spy to its specific series system
Other requirement, for example, can be the series system of anaerobic-aerobic.As needed, can be with anoxia
Process and the strict anaerobic treatment (dissolved oxygen is 0) for controlling dissolved oxygen is set before Aerobic Process for Treatment.At anaerobism
The condition of reason generally includes temperature for 10-40 DEG C, and hydraulic detention time is 2-6h.
In the present invention, it is possible to use activated sludge commonly used in the art carries out biological denitrificaion, preferably feelings
Under condition, the sludge loading of the activated sludge that anoxic treatment and/or Aerobic Process for Treatment are used is 0.15-0.5kg
COD/ (kg sludge d).
In order to make full use of the activated sludge, present invention additionally comprises by after remaining part Aerobic Process for Treatment
Mixed material carries out solid-liquid separation, and the activated sludge return to step (1) that solid-liquid separation is obtained to mend
So that sludge concentration balance in being charged to whole processing system.Specific operation by those skilled in the art public affairs
Know, the present invention will not be described here.
In order to further improve effluent characteristics, the method for the present invention be additionally may included in into Aerobic Process for Treatment and
Before anoxic treatment, electro-desalting waste water is first carried out homogenizing and dissolved air flotation.The homogenizing is generally by stirring
Realization is mixed, the condition of dissolved air flotation is generally included：Relative to 1000m3Pending electro-desalting waste water,
The flow of the gas being passed through is preferably 200-400m3/ h, temperature are 0-40 DEG C, and the time is 0.5-1.0h.
Hereinafter will be described the present invention by embodiment.In following examples,
The assay method of COD value is dichromate titration (GB11914-89)；
The assay method of ammonia-nitrogen content (NH4+-N) is Berthelot spectrophotometry (HJ 535-2009)；
The assay method of total nitrogen level (NO3--N) clears up ultraviolet spectrophotometry for alkaline chitinase
(HJ 636—2012)；
The assay method of petroleum content be infrared spectrophotometer (HJ 637-2012), the survey of SS contents
Method is determined for gravimetric method (GB 11901-89)；
The assay method of sulfide content is the spectrophotography (GB/T 17133-1997) that directly develops the color；
The assay method of basicity is titrimetry (GB/T 15451-95)；
In cyclone, the velocity gradient of backflow is surveyed by U.S. YSI FlowTracker doppler velocimeters
It is fixed；
The particle diameter of activated sludge determines (Malvem Mastersizer by Malvem laser particle instruments
2000, Malvem, UK) determine；
The inlet diameter of cyclone is 0.02m.
The water quality of the electro-desalting waste water used in embodiment is as shown in table 1.
Table 1
Embodiment 1
Active sludge treatment (including anoxic treatment and Aerobic Process for Treatment) is carried out to electro-desalting waste water 1, it is described
The method of process according to "《Water Pollution Control Engineering》The 342-344 page：Water Pollution Control Engineering, king
Yu is edited, Lin Fengkai associate editors, Chemical Industry Press, and 2008 " carry out.Except for the difference that, aerobic
Cyclone is set on the reflux pipeline for returning anaerobism, and the flow velocity of cyclone charging aperture is 4-6m/s, feeds pressure
Power be 0.10-0.15MPa, charging aperture and discharging opening pressure differential be 0.10-0.15MPa, cyclone overflow
3.5 volumes % of the flow of head piece for inlet flow rate, from the mixed material (backflow) of Aerobic Process for Treatment
In cyclone, the velocity gradient of eddy flow is 4000S-1.The active pollution index of 80 weight % after eddy flow
Particle diameter is 0.5-1mm, and the particle diameter of all active pollution index is less than 2mm.Result such as table 2
It is shown.
Embodiment 2
Carry out active sludge treatment to electro-desalting waste water 2 (including anoxic treatment and Aerobic Process for Treatment).It is described
The method of process according to "《Water Pollution Control Engineering》The 342-344 page：Water Pollution Control Engineering, king
Yu is edited, Lin Fengkai associate editors, Chemical Industry Press, and 2008 " carry out.Except for the difference that, aerobic
Cyclone is set on the reflux pipeline for returning anaerobism, and the flow velocity of cyclone charging aperture is 1-4m/s, feeds pressure
Power be 0.03-0.06MPa, charging aperture and discharging opening pressure differential be 0.06MPa, the overfall of cyclone
Flow for inlet flow rate 2 volumes %, the mixed material (backflow) from Aerobic Process for Treatment is in eddy flow
In device, the velocity gradient of eddy flow is 2800S-1.After eddy flow, the particle diameter of the active pollution index of 60 weight % is
0.5-1mm, the particle diameter of all active pollution index are less than 2mm.Result is as shown in table 2.
Embodiment 3
Carry out active sludge treatment to electro-desalting waste water 3 (including anoxic treatment and Aerobic Process for Treatment).It is described
The method of process according to "《Water Pollution Control Engineering》The 342-344 page：Water Pollution Control Engineering, king
Yu is edited, Lin Fengkai associate editors, Chemical Industry Press, and 2008 " carry out.Except for the difference that, aerobic
Cyclone is set on the reflux pipeline for returning anaerobism, and the flow velocity of cyclone charging aperture is 6-8m/s, feeds pressure
Power be 0.08-0.10MPa, charging aperture and discharging opening pressure differential be 0.10MPa, the overfall of cyclone
Flow for inlet flow rate 5 volumes %, from Aerobic Process for Treatment mixed material in cyclone eddy flow
Velocity gradient is 5600S-1.After eddy flow, the particle diameter of the active pollution index of 90 weight % is 0.5-1mm,
The particle diameter of all active pollution index is less than 2mm.Result is as shown in table 2.
Embodiment 4-6
Electro-desalting waste water 1 is processed according to the method for embodiment 1, except for the difference that, in Aerobic Process for Treatment
During, carbon dioxide is passed through in aerobic unit, the amount of the carbon dioxide being passed through causes carbon dioxide
0.8 is respectively with the volume of oxygen：1,0.5：1 and 1：1.
Comparative example 1
Method according to embodiment 1 carries out biological denitrificaion, except for the difference that, in the aerobic backflow for returning anaerobism
Cyclone is not provided with pipeline, but is directly back to anaerobism workshop section.As a result it is as shown in table 2.
Table 2
As can be seen from Table 2, using technical scheme, by by least 60 weights in backflow
In 0.5-1mm, the particle diameter of all active pollution index is less than the size controlling of the activated sludge of amount %
In the case of 2mm, the CER of sludge can reach 60 volumes %, and electro-desalting waste water is also obtained
Effectively process.In the case where preferably carbon dioxide is passed through to Aerobic Process for Treatment, can further at reduction
The content of the amino nitrogen, nitrate and total nitrogen of the electro-desalting waste water after reason.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, can be to the technical side of the present invention
Case carries out various simple variants, and these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique described in above-mentioned specific embodiment is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, the present invention are no longer separately illustrated to various possible compound modes.
Additionally, combination in any between a variety of embodiments of the present invention, can also be carried out, as long as its
Without prejudice to the thought of the present invention, which should equally be considered as content disclosed in this invention.
Claims (10)
1. a kind of activated sludge treatment method of electro-desalting waste water, the method are comprised the following steps：
(1) under the conditions of anoxic treatment, electro-desalting waste water is contacted with the material containing activated sludge, enter
The anoxic treatment of row electro-desalting waste water；
(2) mixture of gained after contact is carried out into Aerobic Process for Treatment；
(3) it is described containing activity using the mixed material return to step (1) after the Aerobic Process for Treatment of part as part
The material of sludge；
Wherein, it is back in the mixed material after the part Aerobic Process for Treatment in step (1) at least
The particle diameter of the activated sludge of 60 weight % is not more than 1mm.
2. method according to claim 1, wherein, active in the material containing activated sludge
The particle diameter of sludge is not more than 2mm.
3. method according to claim 1, wherein, by after the part Aerobic Process for Treatment
During mixed material is back to step (1), the mixed material after the part Aerobic Process for Treatment is entered
The process of row eddy flow, in making the mixed material after the part Aerobic Process for Treatment being back in step (1)
The particle diameter of at least activated sludge of 60 weight % be not more than 1mm, the eddy flow is processed in cyclone
Carry out.
4. method according to claim 3, wherein, the condition that the eddy flow is processed causes described
Velocity gradient of the mixed material after the Aerobic Process for Treatment of part in cyclone is not less than 1100S-1, preferably
2800-5600S-1。
5. the method according to claim 3 or 4, wherein, the condition that the eddy flow is processed includes：
With the intake port of the cyclone as 0.02-0.04m on the basis of, the feed flow rate of cyclone is
1-8m/s, charging aperture pressure are not less than 0.03MPa, preferably 0.03-0.15MPa；The cyclone
Charging aperture pressure is more than discharging opening pressure, and pressure differential is 0.03-0.15MPa.
6. method according to claim 3, wherein, the method also includes：It is good in the part
During mixed material after oxygen process is processed in cyclone, after the part Aerobic Process for Treatment
Mixed material carry out overflow, the flow of the overflow is that the mixed material after the part Aerobic Process for Treatment enters
2-5 volumes % of stream amount.
7. method according to claim 1, wherein, the method also includes, remainder is good
Mixed material after oxygen process carries out solid-liquid separation, and the activated sludge return to step that solid-liquid separation is obtained
(1) as the material containing activated sludge described in another part.
8. method according to claim 1, wherein, the COD value of the electro-desalting waste water is
1500-2500mg/L, NH4 +- N content is 60-100mg/L, NO3 -- N content is 0-10mg/L, always
The content of nitrogen is 100-200mg/L, the content of petroleum substance is 800-1500mg/L, and float contains
Measure as 200-400mg/L, the content of sulfide is 15-25mg/L, the basicity with calcium carbonate is
150-300mg/L；Preferably, the electro-desalting waste water is the electro-desalting waste water from oil plant.
9. method according to claim 1, wherein, the part being back in step (1)
The electro-desalting waste water of anoxic treatment is carried out in the flow of the mixed material after Aerobic Process for Treatment and step (1)
The ratio of flow is 2-4.
10. method according to claim 1, wherein, the method also includes, is carrying out aerobic place
Carbon dioxide is passed through during reason, and the intake of carbon dioxide causes the carbon dioxide being passed through and oxygen
Volume ratio is 0.25-1:1.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102198976A (en) * | 2011-04-06 | 2011-09-28 | 尹军 | Technical improvement method for biological sewage treatment process |
| CN105565491A (en) * | 2014-10-16 | 2016-05-11 | 中国石油化工股份有限公司 | Activated sludge treatment method and system for wastewater |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102198976A (en) * | 2011-04-06 | 2011-09-28 | 尹军 | Technical improvement method for biological sewage treatment process |
| CN105565491A (en) * | 2014-10-16 | 2016-05-11 | 中国石油化工股份有限公司 | Activated sludge treatment method and system for wastewater |
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