CN103113002A - Method for processing organic sewage - Google Patents
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Abstract
The invention discloses a method for processing organic sewage. The method comprises the following steps of: culturing and acclimating activated sludge, adding magnetic powder to mixed liquid after the activated sludge is matured, stirring for 6-8 days and ending culturing, wherein 1.5-2.5g of magnetic powder is added per liter of mixed liquid; enabling the sewage to enter a regulation pool; pumping the sewage to a pulse tank of an anaerobic pool for hydrolytic acidification; enabling the sewage to enter an aerobic pool for aerobic treatment; after the treatment, enabling outlet water to enter a secondary sedimentation pool, and enabling sludge to return to the aerobic pool; and directly discharge outlet water of the secondary sedimentation pool if the COD (Chemical Oxygen Demand) of the outlet water of the secondary sedimentation pool is less than 50 mg/L, enabling the outlet water of the secondary sedimentation pool to enter a coagulation and flocculation pool and then enter a final sedimentation pool if the COD is more than 50 mg/L, draining outlet water, and pumping sludge to a sludge pressing machine so as to be subjected to dewatering. The method disclosed by the invention has the beneficial effects that the operating cost is low, the medicated amount of PAC (Polyaluminum Chloride) and PAM (Polyacrylamide) is small, the organic removal rate is high, the sludge sedimentation effect is good, the sludge amount is effectively reduced by 24-32%, and meanwhile, the outlet water can reach the requirements of upgrading standards.
Description
Technical field
The present invention relates to a kind of sewage water treatment method, particularly relate to a kind for the treatment of process of organic sewage.
Background technology
Along with the raising of Chinese Industrialization level, the trend risen steadily also appears in quantity of wastewater effluent.Calendar year 2001, the quantity of wastewater effluent of China was 428.4 hundred million tons, reached 617.3 hundred million tons by 2010, approximately increased every year on average 18.9 hundred million tons.Within 2010, than 2009, increasing by 28.1 hundred million tons, has been a year of increment maximum since 2005.
Correspondingly, the wastewater treatment in China industry is advanced by leaps and bounds, and by the end of the year 2011, national urban wastewater treatment firm adds up to dispose of sewage 393.13 billion cubic meters the whole year, increases on year-on-year basis by 45.72 billion cubic meters, increases by 13.12%.By in by the end of June, 2012, national city, county's accumulative total are built up 3243 of urban wastewater treatment firms, and processing power reaches 1.39 billion cubic meters/day.
When the water yield increases, technical indicator is also promoting, estimate that " 12 " wastewater treatment rate in latter stage will approach developed country's level, in " " 12 " principal pollutant overall control planning establishment technique guide ", point out, the existing sewage work that carries out secondary discharge standard of China will bring up to one-level B standard during " 12 ", one-level A or stricter standard need to be brought up in some areas, and the sewage work in the whole nation 60% need to increase the denitrogenation dephosphorizing facility.
The main method of waste water control at present is chemical method and biological process.Chemical method is by adding chemical reagent pollution degradation material, but Xiang Shuizhong has increased chemical composition, easily cause secondary pollution, and cost is higher.The biological process floor space is larger, and the cycle is longer, and has certain biological limits, drops to certain concentration and just is difficult to breakthrough bottleneck again, and many new intensive treatment technology are arisen at the historic moment.
Magnetic treatment is to utilize magnetic field to the effect of nonferromagnetic fluid, makes the character that is used thing produce the variation of some expectation, thereby improves a kind of technology of production effect and utilization benefit.The many researchists of recent domestic have carried out a large amount of test and studies, some valuable theoretical models have been proposed, mainly contain 6 kinds of theories about magnetic treatment mechanism at present: 1. magnetic field changes charge distribution and the crystalline structure of water: the lorentz's force of the polarized rear Magnetic Field on Water molecule of water is strengthened, the second hydration layer that causes water structure is squeezed and come off, be the disperse of unit molecule water in water system, nucleus of crystal is increased, cause crystalline state to change, form loose, veined structure.2. hydrocarbon polymer in magnetic field, easily from spin singlet state (S state) spin three pure state (T state) that jump, and prohibited, and the molecule number in the T state in liquid is increased, and causes molecule that hydrogen bond rupture to a certain degree occurs by T → S transition.3. magnetic field will cause the internal resonance of fluid molecule and bring out the electric dipole moment effect, make intramolecular bonding change or break, and change molecular configuration, cause the variation of physical property of liquid.4. the action of a magnetic field is conducive to form double electrical layers around the charged particle of liquid, and the stability of solution is increased, and crystallisation process changes.5. magnetic field causes liquid phase-change, by disordered state, changes to ordered state, by symmetrical structure, becomes unsymmetrical structure, by the mesh-structured laminate structure that becomes.6. magnetic field energy causes additional magnetic moment in liquid, thereby produces complementary field and additional energy, and the comprehensive action of these additional content reduces the force of cohesion of diamagnetism liquid, and the molecule potential barrier reduces, and causes the variation of physical properties.
Magnetic separation technique is that development in recent years a kind of novel utilizes the water technology that in waste water, the magnetic of impurity particle is separated.For the particle of non magnetic in water or weak magnetic, utilize the magnetic inoculation technique can make them there is magnetic.Magnetic separation technique is applied to wastewater treatment three kinds of methods: direct magnetic separation method, indirect magnetic separation method and microorganism-magnetic separation method.The magnetization technology of research mainly comprises magnetic reunion technology, the coprecipitated technology of molysite, Powder by Iron Powder, ferrite process etc. at present, and representative magnetic separating apparatus is disk magnetic separator and high gradient magnetic filter.
Magnetic separation technique has that separation efficiency is high, velocity of separation is fast, granularity separation mixture can reach the advantage such as very little, can make some adopt the more difficult or indissociable system of traditional separation method successfully to be separated.
In conventional sewage treatment process, the settling property of mud directly affects the operation of Sewage Plant, especially sludge bulking phenomenon, almost Europe 50%, the sewage work of the U.S. 60% all can occur every year, has affected the effect of sewage disposal, and has expended a large amount of manpowers and material resources.Due to magneticstrength be the hundreds of of gravity field strength to several thousand times, so the magnetic separation technique efficiency far is higher than gravity separation.The appearance of magnetic separation technique, provide a new thinking for solving sludge bulking.Magnetic separation technique, obtaining suitable achievement aspect food, oily(waste)water, municipal effluent and treatment of dyeing wastewater, has goodish effect for heavy metal, oils, superfine suspended substance, particularly pathogenic micro-organism, bacterium, algae removal.
But magnetic separation technique is processed waste water and had following technical difficulty and limitation: the remanent magnetism of medium makes magnetic separating apparatus when the system back flushing, be difficult to being rinsed well by the magnetic-particle that magnetic matrix adsorbed, because affect the working efficiency of next cycle, in order to improve field gradient, must select the magnetic matrix of high magnetic saturation, selection to magnetic matrix has certain technical difficulty, and increases the expense of operation.
Magnetic separation technique has mainly used the high specific gravity characteristic of magnetic, under the effect of coagulating agent and flocculation agent, form with pollutent the flco that proportion is higher separates from waste water, but magnetization can be broken up larger molecular organics as the characteristic of small organic molecule and well do not used, and also has the problem of remanent magnetism problem and expense increase.
Summary of the invention
Based on this, be necessary for the problems referred to above, a kind for the treatment of process of organic sewage is provided.
A kind for the treatment of process of organic sewage, comprise the steps:
(1) carry out cultivation and the domestication of active sludge in Aerobic Pond;
The cultivation of described active sludge is: active sludge is dropped in Aerobic Pond, add tap water and obtain mixed solution, then add BOD
5: the nutrition source that N:P is 100:5:1, cultivate 2-4 days, to the flco appearance, continue to add above-mentioned nutrition source, once a day, cultivate 10-11 days, to the SV of mixed solution
30for 23-27%, i.e. active sludge maturation, then add magnetic in mixed solution, and stir 6-8 days, cultivate and finish; The addition of described magnetic is: in every liter of mixed solution, add 1.5-2.5g; In described whipping process, stirring velocity is 50-200 rev/min, and dissolved oxygen is 2-3mg/L;
Being domesticated for of described active sludge: add sewage in cultured active sludge, keep stirring and aeration, domestication 6-8 days, stable to water outlet COD, i.e. domestication finishes;
(2) sewage enters equalizing tank;
(3) by the sewage lifting in the described equalizing tank of step (2) to the acidifying that is hydrolyzed in the anaerobic pond Impulsive tank;
(4) sewage after step (3) acidication enters in the described Aerobic Pond of step (1) and carries out aerobic treatment;
(5) after step (4) aerobic treatment, water outlet enters second pond, the sludge reflux Aerobic Pond;
(6) if second pond water outlet COD is less than 50mg/L, directly discharge; If COD is greater than 50mg/L, enter the coagulation-flocculation pond, then enter final deposition pool, the water outlet discharge, sludge lifting, to pressing the dehydration of mud machine, gets final product;
In some embodiment, in the described Aerobic of step (4), add magnetic in Aerobic Pond therein, within every 1-2 days, add once; The addition of described magnetic is: in every liter of Aerobic Pond sewage, add 1.8-2.2g.
In some embodiment, the described magnetic addition of step (1) is therein: add 1.8-2.2g in every liter of mixed solution, churning time is 6.5-7.5 days, and stirring velocity is 100-200 rev/min.
In some embodiment, the interpolation point of described magnetic is located at the underwater of Aerobic Pond water inlet place therein.
In some embodiment, described magnetic is iron oxide magnetic powder therein.
In some embodiment, the sewage in the described equalizing tank of step (2) mixes in the mode of aeration therein, and adjusting pH is 6-9.
In some embodiment, in the described Aerobic Pond of step (4), establish air-blast device and whipping appts therein, described air blast adopts the turbulent flow type aeration, and the rotating speed of stirring is 100-200 rev/min.
In some embodiment, in the described Aerobic Pond of step (4), sludge concentration is 2-3g/L, SV therein
30for 25-30%.
In some embodiment, the described return sludge ratio of step (5) is 100% therein.
In some embodiment, in the described coagulation-flocculation of step (6) pond, add PAC and PAM therein, and stir; The speed of described stirring is 50-150 rev/min; The dosage of described PAC and PAM is: in every liter of coagulation-flocculation pond sewage, add respectively: 0.5-1.5mg, 0.45-0.55mg.
The treatment process of organic sewage of the present invention has following advantage and beneficial effect:
(1) the method working cost is low, and the dosage of PAC and PAM is few, and organic removal rate is high, and the sludge settling effect is good, effectively reduces the sludge quantity of 24-32%.
(2) the method effectively reduce medicament expense with and the sludge treatment expense, the while guarantees again that water outlet reaches and proposes the mark requirement, has economic benefit and environmental benefit preferably.
The accompanying drawing explanation
The process flow sheet of the treatment process that Fig. 1 is organic sewage;
Fig. 2 is the COD of sewage removal effect figure processed through embodiment 1;
Fig. 3 is the COD of sewage removal effect comparison diagram through embodiment 1 and traditional wastewater disposal methods.
Embodiment
The treatment process of a kind of organic sewage of the present invention, mainly utilize microbiological deterioration and magnetized synergy, because larger molecular organics belongs to the composition of difficult for biological degradation, trade effluent particularly, many biodegradable organic constituents that are difficult to are arranged, be that biodegradability is poor, B/C is than low, conventional acidication also is difficult to macromole is broken up, based on this, the present invention is by adding magnetic, and the magnetization of magnetic can be broken up larger molecular organics the small organic molecule for being degraded by bio-absorbable, in conjunction with the effect of microorganism, pollution substance is removed fully the most at last again.The magnetic of adsorb organic compound and microorganism, in conjunction with generating flco, because the proportion of magnetic is larger, can effectively prevent sludge bulking, also be beneficial to the settlement separate process of mud at second pond, reduce the added amount of chemical of PAC and PAM, reduce the risk of secondary pollution, reduce working cost.
Technical terms " COD " related in the present invention is chemical oxygen demand (COD), the English Chemical OxygenDemand that claims; BOD
5for biochemical oxygen demand (BOD), the English Biology Oxygen Demand that claims; SV
30for sludge settling ratio; PAC is polymerize aluminum chloride, the English Polyaluminium Chloride that claims; PAM is polyacrylamide, the English Polyacrylamide that claims; DO is dissolved oxygen, and English is called Dissolved Oxygen.
The process flow sheet of the treatment process of a kind of organic sewage of the present invention is referring to Fig. 1.
Below with reference to specific embodiment, the present invention will be further described.
A kind for the treatment of process of organic sewage, comprise the steps:
(1) cultivation of active sludge and domestication;
The cultivation of described active sludge is: using the active sludge in the municipal wastewater Aerobic Pond as seed sludge, drop in the described Aerobic Pond of step (4), add tap water and obtain mixed solution, then add BOD
5: the nutrition source that N:P is 100:5:1, cultivate solution after 3 days and start to present yellow, there is ambiguous flco to occur simultaneously, continue to cultivate, and continue to add BOD
5: the nutrition source that N:P is 100:5:1, once a day, after cultivating 5 days, occur that a large amount of foams and stink are extremely dense, now should adopt aeration to keep the dissolved oxygen abundance in water, cultivate after 6 days, foam fades away, SV
30reach 90% left and right, settling property is poor, and microscopy has a small amount of amoeba, and major part is still packing, cultivate after 12 days SV
30be 75%, and the separation surface of mud and sewage is clear, microscopy can be seen many swimming type ciliates, and the cultivation of this phenomenon explanation active sludge is in mid-term stage, cultivate after 14 days, settling property is fabulous, SV is 25%, microscopy is found a large amount of zoogloeas, and with a small amount of campanularian and other active protozoons, it is the active sludge maturation, add again the iron oxide magnetic powder of 2g/L in ripe active sludge intermixture, stir, magnetic is fully contacted with mud, but stirring velocity is unsuitable excessive, be controlled at 180 rev/mins, avoid flco is broken up, keep aeration rate and nutrition source simultaneously, the control dissolved oxygen is 2.5mg/L, stir after 7 days, magnetic gel basically forms, microbe population is more, active, gel group arranges closely, settling property is good, cultivate and finish,
Being domesticated for of described active sludge: add sewage in above-mentioned cultured active sludge, progressively replace the sewage of required processing, concentration progressively improves, and keeps stirring and aeration simultaneously, tames 7 days, stable to water outlet COD, i.e. domestication finishes.
(2) sewage enters equalizing tank:
Pending sewage is introduced into equalizing tank, and equalizing tank carries out former water fully to mix with homogenizing water quality in the mode of aeration, avoids variation water quality to impact biochemical system, regulates the pH value simultaneously, is controlled between 6-9;
(3) by the sewage lifting of the described equalizing tank of step (2) to the acidifying that is hydrolyzed in the anaerobic pond Impulsive tank, specific as follows:
The sewage of the described equalizing tank of step (2) is entered into to the anaerobic pond Impulsive tank by lifting system, under the acidication effect of anerobe, the macromole in sewage is converted into to micromolecular compound, be beneficial to the back segment aerobic treatment;
(4) step (3) enters Aerobic Pond through the sewage of acidication, carries out aerobic treatment, specific as follows:
Step (3) is entered to Aerobic Pond through the sewage of acidication, establish air-blast device and whipping appts in Aerobic Pond, described air-blast device adopts the larger turbulent flow type aeration of aeration rate, should not adopt micro-pore aeration, can adopt jet-flow aeration in the little situation of the water yield, control DO at 2-4mg/L; Stirring velocity is unsuitable too fast, and rotating speed is 140 rev/mins, prevents from flco is broken up; Add the 2g iron oxide magnetic powder in every liter of Aerobic Pond sewage, add every day once, add and a little be located at below the Aerobic Pond front end water inlet place water surface, owing to containing the active sludge of having tamed in Aerobic Pond, contain magnetic and abundant microorganism in this active sludge, the adsorbable a large amount of larger molecular organics of magnetic, magnetization also can be broken up larger molecular organics into small organic molecule simultaneously, the effect of enhanced hydrolysis acidifying, then digested by aerobic microbiological, pollution substance is removed fully the most at last;
(5) after aerobic treatment, water outlet enters second pond, and the sludge reflux Aerobic Pond is specific as follows:
Water outlet through aerobic treatment in step (4) is entered to the second pond rapid precipitation, sludge reflux Aerobic Pond, reflux ratio 100%, the point that refluxes adds a little for the magnetic in step (4), conveniently with magnetic and water inlet, fully mix, control sludge concentration in Aerobic Pond is 2-3g/L simultaneously, SV
30for 25-30%.
(6) if second pond water outlet COD is less than 50mg/L, directly discharge; If COD is greater than 50mg/L, enter the coagulation-flocculation pond, add 1mgPAC and 0.5mgPAM in every liter of coagulation-flocculation pond sewage, stir, stirring velocity is 100 rev/mins, then enters final deposition pool, the water outlet discharge, sludge lifting is pressed the dehydration of mud machine, gets final product.
Get the sewage that COD concentration is different, after embodiment 1 processes, the COD removal effect can be referring to Fig. 2.
Take embodiment 1 as test group, identical with the present embodiment 1 sewage water treatment method, but the traditional treatment method of not adding magnetic in the cultivation of step (1) active sludge and domestication neutralization procedure (4) Aerobic Pond is control group, the sewage water treatment method that does not add magnetic is control group, comparative analysis is through the COD of the sewage of two kinds for the treatment of process gained value, and result is referring to Fig. 3.
From Fig. 2 and Fig. 3, the influent COD of test group is 120-160mg/L, and water outlet COD is 20-47mg/L, and organic removal rate is 58%-87%; And the influent COD of control group is at 120-160mg/L, water outlet COD is 70-100mg/L, and organic removal rate is at 33-53%; Contrast knownly, the test group organic removal rate is apparently higher than control group.
Water outlet can reach proposes the mark requirement, and sedimentation effect is better, and mud production rate lowers 1%-2%, and sludge quantity reduces 24%-32%, and dosage reduces PAC and PAM, saves working cost.
Embodiment 2
The treatment process of the described organic sewage of the present embodiment, step is substantially the same manner as Example 1, different: in the culturing process of step (1) active sludge, add the iron oxide magnetic powder of 1.5g/L in ripe active sludge intermixture, stirring velocity is 50 rev/mins, churning time is 6 days, and control DO is 2mg/L; In step (4), in Aerobic, rotating speed is 70 rev/mins, and the dosage of magnetic is: in every liter of Aerobic Pond sewage, add the 1.8g iron oxide magnetic powder.
The control group sewage water treatment method of the present embodiment, referring to the control group of embodiment 1.
Get the sewage that COD is 120mg/L, after embodiment 2 processes, result shows: influent COD is 120mg/L, and water outlet COD is 50mg/L, and organic removal rate is 58%; And the influent COD of control group is at 120mg/L, water outlet COD is 75mg/L, and organic removal rate is 37.5%; Contrast knownly, the test group organic removal rate is apparently higher than control group.
Water outlet can reach proposes the mark requirement, and sedimentation effect is better, and mud production rate lowers 1%, and sludge quantity reduces 24%, and dosage reduces PAC and PAM, saves working cost.
The treatment process of the described organic sewage of the present embodiment, step is substantially the same manner as Example 1, different: in the culturing process of step (1) active sludge, add the iron oxide magnetic powder of 2.5g/L in ripe active sludge intermixture, stirring velocity is 120 rev/mins, churning time is 8 days, and control DO is 3mg/L; In step (4), in Aerobic, rotating speed is 140 rev/mins, and the dosage of magnetic is: in every liter of Aerobic Pond sewage, add the 2.2g iron oxide magnetic powder.
The control group sewage water treatment method of the present embodiment, referring to the control group of embodiment 1.
Get the sewage that COD is 160mg/L, after embodiment 3 processes, result shows: influent COD is 160mg/L, and water outlet COD is 21mg/L, and organic removal rate is 87%; And the influent COD of control group is at 160mg/L, water outlet COD is 75mg/L, and organic removal rate is 53%; Contrast knownly, the test group organic removal rate is apparently higher than control group.
Water outlet can reach proposes the mark requirement, and sedimentation effect is better, and mud production rate lowers 2%, and sludge quantity reduces 32%, and dosage reduces PAC and PAM, saves working cost.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the treatment process of an organic sewage, is characterized in that, comprises the steps:
(1) carry out cultivation and the domestication of active sludge in Aerobic Pond;
The cultivation of described active sludge is: active sludge is dropped in Aerobic Pond, add tap water and obtain mixed solution, then press BOD
5: the ratio that N:P is 100:5:1 adds nutrition source, cultivates 2-4 days, to the flco appearance, continues to add above-mentioned nutrition source, once a day, cultivates 10-11 days, to the SV of mixed solution
30for 23-27%, then add magnetic in mixed solution, stir 6-8 days, to gel formation; The addition of described magnetic is: add magnetic 1.5-2.5g in every liter of mixed solution; In described whipping process, stirring velocity is 50-200 rev/min, and dissolved oxygen is 2-3mg/L;
Being domesticated for of described active sludge: add sewage in cultured active sludge, keep stirring and aeration, domestication 6-8 days, stable to water outlet COD, i.e. domestication finishes;
(2) sewage enters equalizing tank;
(3) by the sewage lifting in the described equalizing tank of step (2) to the acidifying that is hydrolyzed in the anaerobic pond Impulsive tank;
(4) sewage after step (3) acidication enters in the described Aerobic Pond of step (1) and carries out aerobic treatment;
(5) after step (4) aerobic treatment, water outlet enters second pond, the sludge reflux Aerobic Pond;
(6) if second pond water outlet COD is less than 50mg/L, directly discharge; If COD is greater than 50mg/L, enter the coagulation-flocculation pond, then enter final deposition pool, the water outlet discharge, sludge lifting, to pressing the dehydration of mud machine, gets final product.
2. treatment process according to claim 1, is characterized in that, the described magnetic addition of step (1) is: add 1.8-2.2g in every liter of mixed solution, churning time is 6.5-7.5 days, and stirring velocity is 100-200 rev/min.
3. treatment process according to claim 1, is characterized in that, in the described Aerobic of step (4), adds magnetic in Aerobic Pond, within every 1-2 days, adds once; The addition of described magnetic is: in every liter of Aerobic Pond sewage, add 1.8-2.2g.
4. treatment process according to claim 3, is characterized in that, the interpolation point of described magnetic is located at the underwater of Aerobic Pond water inlet place.
5. according to the described treatment process of claim 1-4 any one, it is characterized in that, described magnetic is iron oxide magnetic powder.
6. treatment process according to claim 1, is characterized in that, the sewage in the described equalizing tank of step (2) mixes in the mode of aeration, and adjusting pH is 6-9.
7. treatment process according to claim 1, is characterized in that, in the described Aerobic Pond of step (4), establishes air-blast device and whipping appts; Described air blast adopts the turbulent flow type aeration, and the rotating speed of described stirring is 100-200 rev/min.
8. treatment process according to claim 1, is characterized in that, in the described Aerobic Pond of step (4), sludge concentration is 2-3g/L, SV
30for 25-30%.
9. treatment process according to claim 1, is characterized in that, the described return sludge ratio of step (5) is 100%.
10. treatment process according to claim 1, is characterized in that, in the described coagulation-flocculation of step (6) pond, adds PAC and PAM, and stir; The speed of described stirring is 50-150 rev/min; The dosage of described PAC and PAM is respectively: in every liter of coagulation-flocculation pond sewage, add 0.5-1.5mg and 0.45-0.55mg.
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| CN108178444A (en) * | 2018-01-10 | 2018-06-19 | 广东益康生环保科技有限公司 | A kind of pulsed integrated sewage treating apparatus |
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| CN106186571A (en) * | 2016-08-31 | 2016-12-07 | 泉州中投文化发展有限公司 | A kind of integrated sewage treating apparatus with anaerobic and aerobic process function |
| CN108178444A (en) * | 2018-01-10 | 2018-06-19 | 广东益康生环保科技有限公司 | A kind of pulsed integrated sewage treating apparatus |
| CN108395053A (en) * | 2018-02-10 | 2018-08-14 | 南京锐康环境工程有限公司 | A kind of industrial wastewater landscape type purification system |
| CN110436749A (en) * | 2019-06-22 | 2019-11-12 | 桂林理工大学 | Accelerate the method for activated sludge sinking speed using magnetization micron ferroso-ferric oxide |
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