CN100400433C - Strengthened primary treatment method for internal electrolyzing sewage through aeration and catalyzing iron - Google Patents
Strengthened primary treatment method for internal electrolyzing sewage through aeration and catalyzing iron Download PDFInfo
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- CN100400433C CN100400433C CNB2005100288363A CN200510028836A CN100400433C CN 100400433 C CN100400433 C CN 100400433C CN B2005100288363 A CNB2005100288363 A CN B2005100288363A CN 200510028836 A CN200510028836 A CN 200510028836A CN 100400433 C CN100400433 C CN 100400433C
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Abstract
This invention relates to a primarily reinforced wastewater treatment method through aeration catalyzed iron internal electrolysis process. The method comprises: (1) pretreating wastewater with grill and sedimentation sand, introducing the pretreated wastewater into an aeration catalyzed iron internal electrolysis tank carrying copper and iron blended filler at a weight ratio of (0-0.5) : 1 (if the ratio is 0, the carbon content in iron must be more than 0.15%), and controlling the concentration of dissolved oxygen to be 0.1-8 mg/L; (2) discharging treated wastewater from the tank, performing sludge-water separating, and discharging after sedimentation. The method has such advantages as low volume of reaction tank, low cost of construction and operation, low energy consumption, short treatment time and no need for other treating agents. As for the low-concentration municipal wastewater (BOD lower than or equal to 80 mg/L), the treatment effect can be up to or superior to the secondary standard of the discharge standard of pollutants for municipal wastewater treatment plant.
Description
Technical field
The present invention relates to the primary reinforcement treatment process technical field of municipal effluent.
Background technology
In municipal sewage treatment, lower to organic clearance to be precipitated as main one-level processing, the suspended solids clearance is generally 40%～60%, BOD
5Clearance only is 20%～30%, and the COD clearance is about 50%.Only adopt one-level to handle, be difficult to effectively control water and pollute.Primary reinforcement is handled the clearance that can improve organism and other pollutent by less input significantly, and therefore, the primary reinforcement treatment technology causes the attention of domestic and international engineering of water treatment circle gradually, becomes new research focus.The usable condition that the municipal effluent primary reinforcement is handled mainly contains: (1) handles direct qualified discharge for the municipal effluent of lower concentration through primary reinforcement.This kind mode was adopted in the sewage disposal of samll cities and towns during China was many, can less investment cut down relatively large pollution load.(2) build one-level half treatment plant at no distant date earlier, processing obtains investment environment benefit preferably through primary reinforcement, builds complete second-stage treatment technology when waiting to have ready conditions again.(3) for be treated to main municipal sewage plant with two stage biological, handle, remove the organism, heavy metal and the inorganic salt that are difficult to the biochemical treatment removal, alleviate the load of second-stage treatment simultaneously, cut down the consumption of energy by primary reinforcement.
The more enhanced primary treatment technology of research mainly contains hydrolysis process, preaeration technology, biofloculation absorbing process, chemical flocculation technology etc. at present:
1, hydrolysis primary reinforcement treatment process adopts hydrolytic tank to replace preliminary sedimentation tank exactly, in the hydrolytic tank anaerobic fermentation process is controlled at hydrolysis and produces acid phase; Under the effect of hydrolysis acid-producing bacteria, the non-solubility organism in the sewage is hydrolyzed to dissolved organic matter, and macromolecular substance is degraded to small-molecule substance.Therefore, through behind the hydrolysis process, the biodegradability of sewage obtains bigger raising.If only adopting hydrolytic tank to carry out the sewage one-level handles, its effluent quality is difficult to reach secondary discharge standard, must follow-up second-stage treatment just can make effluent quality reach secondary or first discharge standard, and, required residence time of hydrolysis process is longer, influence factor is more, uses when generally only higher and biodegradability is bad in entering organic matter of water concentration.
2, preaeration primary reinforcement treatment process is the improvement on traditional one-level processing basis.Before sewage enters settling tank, carry out preaeration, improve the sedimentation function of suspended substance, impel the suspended substance flocculation that runs foul of each other, make proportion approach 1 molecule, after flocculating, in settling tank, be removed.The preaeration structures can unite two into one with aerated grit chamber, also can be before settling tank ad hoc preaeration tank, aeration time is got 20～30min.Preaeration primary reinforcement treatment process divides nature preaeration and biofloculation preaeration again, and the former is aeration only, and the latter then needs to add residual active sludge in preaeration tank.Compare with conventional one-level processing, natural preaeration is to SS and BOD
5Clearance only improve about 5%, strengthening effect is not too obvious.Biofloculation preaeration is higher to the SS clearance, but because the backflow excess sludge has strengthened the SS concentration that enters preliminary sedimentation tank, makes it go out water number and handles to compare with conventional one-level and be more or less the same; Biofloculation preaeration is to SS and BOD
5The more natural preaeration of clearance can improve about 15%, and effect is obvious.But it is bigger that this technology is only applicable to treatment scale, aerated grit chamber can be set, and surplus sludge volume is enough to the sewage work of continuous blow-down.After carrying out the preaeration reinforcement, its one-level treat effluent is difficult to reach secondary discharge standard, make treat effluent up to standard, must establish the subsequent biological treatment facility.
3, biofloculation primary reinforcement treatment process mainly is the flocculation adsorption that utilizes active sludge, improve the clearance of settling tank to non-solubility organic pollutant in the sewage, its essence is exactly biological absorption regeneration method, only the hydraulic detention time in each pond is short slightly, belongs to high loading absorption regeneration method.(BOD when organic pollution load is not high in the water inlet
5≤ 80mg/L), adopt this technology to substitute preliminary sedimentation tank, needn't add any medicament, can make water outlet reach secondary discharge standard.But still need aerator and mud to return heavy equipment in the technology, cause energy consumption higher, and its surplus sludge volume is bigger; In addition, when organic concentration increases in the sewage at a specified future date,, still need subsequent biological treatment technology for making the water quality reaching standard that dispatches from the factory.Make entire sewage treatment plant technology become adsorption biodegradation.Because structures and equipment that this technology is set up on the preliminary sedimentation tank basis are more, therefore, are not suitable for the primary reinforcement transformation of conventional one-level or B-grade sewage factory, are only applicable to newly-built Sewage Plant.
4, the principle of chemical flocculation strengthening treatment process is identical with coagulating sedimentation principle in the feedwater, by adding flocculation agent, small suspended solids, colloidal solid is taken off surely, assemble to form bigger particle, thus the raising deposition efficiency.Compare with conventional one-level processing, the chemical flocculation primary reinforcement is handled the removal efficient that can increase substantially organic pollutant, and strengthening effect is obvious, and better to the removal effect of total phosphorus, facility is simple; But exist sludge output big, to shortcomings such as pollution substance clearance imbalance, the increases of added amount of chemical ambassador cost.
Urban Pollution Control National Engineering Research Center of Tongji University once develops " method for the treatment of used water difficult to degradate by catalytic internal electrolysis of iron " at indegradable industrial effluent, and (patent No. is: CN_1382649A).Mainly be that biological sewage treatment method is carried out pre-treatment.This method is to grow up on the basis of internal electrolysis, iron is as the anode of galvanic cell, copper replaces carbon to become the negative electrode of galvanic cell, the zeolite that adds a certain amount of cats product modification simultaneously, this method is in order to make full use of the reductive action of iron, be under the situation of aeration not, to carry out, avoid iron by molecular oxygen oxidation.In fact, in this method to the treatment effect of waste water except reduction reaction and interior electrolytic reaction, the coagulation and the precipitating action that also have ferrous ion and iron ion, can make more pollutent obtain removing, but, can not get strengthening and making full use of under this situation that acts on aeration not on the one hand.
Summary of the invention
Purpose of the present invention just provides the municipal effluent primary reinforcement treatment process that a kind of cost is low and adaptability is extensive.
For realizing this purpose, the coagulation that the present invention makes full use of the ferrous and iron ion of nascent state carries out the primary reinforcement processing of municipal effluent.The concrete grammar principle is: put into iron copper mixed fillers in the aeration tank, with the anode of iron as galvanic cell, contained carbon all can be used as the negative electrode formation internal electrolysis of iron pond of galvanic cell in copper and the iron, the stripping of iron has been quickened in the aeration effect, ferrous and the iron ion of more nascent states is produced, the ferric hydroxide colloid that these iron ion hydrolysis generate is good flocculation agent, the Fe (OH) that obtains than general medicament hydrolysis
3Have stronger adsorptive power, the micelle structure can be expressed as: { m[Fe (OH)
3] nFeO
+(n-x) C
-}
X+XC
-, wherein C is the negatively charged ion in the solution.Ferric hydroxide colloid is positively charged in the waste water solution, it can with some materials of oppositely charged, and heavy poly-effect takes place in the ionogen in the solution.Therefore, the suspended substance in the waste water, colloidal solid and part macromolecular compound and some inorganicss all can be removed by this throwing out.
Aeration and catalyzing iron internal electrolysis sewage primary reinforcement treatment process of the present invention, its step comprises:
A, waste water enter electrolyzer in the aeration and catalyzing iron after pre-treatment, the control by aeration rate makes dissolved oxygen concentration in the pond at 0.1～8mg/L, places iron copper mixed fillers in the pond, and the ratio of copper and iron is W
Cu/ W
Fe=0～0.5, work as W
Cu/ W
Fe=0 o'clock, the carbon content of iron must be greater than 0.15%;
B, mud-water separation is carried out in the water outlet of electrolyzer in the aeration and catalyzing iron, the precipitated outlet water discharging.
Aeration and catalyzing iron internal electrolysis sewage primary reinforcement treatment process of the present invention, wherein the hydraulic detention time of the waste water of step a in the pond was generally 5～180 minutes.The porosity of the iron copper mixed fillers of placing in the pond is 10～80%.The pre-treatment of waste water is meant through grid, sand setting pre-treatment.
According to the different situations of waste water, also can in iron copper mixed fillers, add the zeolite of cats product modification, its content is 0%～20% of iron copper gross weight.The effect of cation-modified zeolite mainly is the assisting ion exchange interaction, simultaneously ammonia nitrogen is had certain removal effect.The water quality and the residence time determine its ratio, and dosage is excessive may to cause obstruction.
Different situations and processing requirements according to waste water can be provided with internal recycle, and the inner circulating reflux ratio is 0: 1～8: 1.The inner circulating reflux ratio is obtained big more, and power consumption will be big more.The effect of internal recycle mainly is to make waste water obtain the sufficient reaction times, and the length in reaction times is directly related with waste water quality.Normal conditions, influent concentration are not very high, hydraulic detention time neither too short situation under, can internal recycle or get less inner circulating reflux ratio; When the sewage water yield is little, the reaction tank floor space is little, and hydraulic detention time can adopt bigger inner circulating reflux ratio very in short-term.
Aeration and catalyzing iron internal electrolysis sewage primary reinforcement treatment process of the present invention, wherein the sedimentation time of step b is 1.5～3 hours, precipitating sludge can one day or a couple of days discharging once.
Beneficial effect of the present invention: aeration and catalyzing iron internal electrolysis sewage primary reinforcement treatment process of the present invention, needed reaction tank volume is little, and capital cost is low, energy consumption is low, the treating processes time is short, also no longer needs to add in addition medicament, and working cost is also very low.And after aeration and catalyzing iron internal electrolysis sewage primary reinforcement disposal methods of the present invention, the SS of municipal effluent, COD
Cr, BOD
5, TP-P etc. clearance reach 80% respectively, 60%, 60%, more than 85%, (water inlet BOD≤80mg/L), the These parameters of water outlet all can reach or be better than the requirement of country's " urban wastewater treatment firm pollutant emission standard " secondary standard (BB18918-2002) after process the present invention handled for low concentration municipal wastewater.
Embodiment
Embodiment 1: handle certain community life sewage with method of the present invention.
The COD of this sanitary sewage
Cr, BOD
5, SS, TP-P be respectively 400～700mg/L, 200～300mg/L, 100～500mg/L, 10～30mg/L, pH is 7.5～8.5.Adopt aeration and catalyzing iron internal electrolysis sewage primary reinforcement treatment process of the present invention that it is handled, idiographic flow is as follows:
1. sewage enters electrolyzer in the aeration and catalyzing iron through the grid pre-treatment, and dissolved oxygen is controlled at 4～8mg/L in the pond, and hydraulic detention time 180min, inner circulating reflux were than 0: 1, and copper and iron are pressed W
Cu/ W
Fe=0.1 ratio thorough mixing does not add modified zeolite, and the filler porosity is 10%.
2. the waste water that electrolyzer comes out in the aeration and catalyzing iron enters settling tank and carries out solid-liquid separation, and sedimentation time is 1.5 hours, and mud discharging in two days once.
Through above processing, effluent quality and clearance see the following form 1.Higher because of entering organic matter of water concentration, though water outlet fails to reach secondary discharge standard, the clearance of each index all is not less than the clearance that general chemistry flocculation primary reinforcement is handled, and especially phosphor-removing effect is fine.
Table 1
| Water-quality guideline | COD Cr(mg/l) | BOD 5(mg/l) | SS(mg/l) | TP-P(mg/l) |
| Water outlet | 80～278 | 70～120 | 10～75 | ≤3 |
| Clearance | ≥60％ | ≥60％ | ≥85％ | ≥90％ |
Embodiment 2: with method of the present invention certain city combined sewage is handled.
This city combined sewage requires to concentrate the mode of discharging with deep water in the entrance of Changjiang River after the pre-treatment, and the self-purification capacity that makes full use of water body is handled sewage effluent, reduces investment in the recent period.Because of the eutrophication phenomenon of entrance of Changjiang River external water area is serious, the time have red tide to take place, so comparatively strict requirement is arranged for the dephosphorization of sewage effluent.Adopt aeration and catalyzing iron internal electrolysis sewage primary reinforcement treatment process of the present invention that it is carried out pilot scale and handle research, concrete steps are as follows:
1. waste water enters electrolyzer in the aeration and catalyzing iron after the grid pre-treatment, and dissolved oxygen is controlled at 2～5mg/L in the pond, and hydraulic detention time 30min, inner circulating reflux were than 0: 1, and filler adopts the iron plane flower, does not add copper, and promptly copper and iron ratio are W
Cu/ W
Fe=0, add modified zeolite 20%, the filler porosity in the catalytic internal electrolysis of iron pond is 80%.
2. the waste water that electrolyzer comes out in the aeration and catalyzing iron enters settling tank and carries out solid-liquid separation, and sedimentation time is 2 hours, and mud discharging in a day once.
Through above processing, Inlet and outlet water water quality situation sees Table 2, and the every index of water outlet is removed BOD
5, other all can reach or be better than the regulation of national grade ii standard (GB18918-2002).
Table 2
| Water-quality guideline | COD Cr(mg/l) | BOD 5(mg/l) | SS(mg/l) | TP-P(mg/l) | pH |
| Water inlet | 130～272 | 42～114 | 52～320 | 1.0～6.8 | 6.8～7.8 |
| Water outlet | 45～90 | 10～43 | ≤30 | ≤0.6 | 7.0～8.0 |
| Clearance | ≥60％ | ≥60％ | ≥85％ | ≥90％ | ≥85％ |
Embodiment 3: with method of the present invention certain municipal effluent is handled
The existing technology of this municipal wastewater treatment plant is chemical flocculation primary reinforcement treatment process, adds poly-ferric chloride and PAM, and dosage is 40mg/LFeCl
3And 0.5mg/LPAM.Adopting aeration and catalyzing iron internal electrolysis sewage primary reinforcement treatment process of the present invention that this sewage is carried out pilot scale handles:
1. waste water is through grid, just enter electrolyzer in the aeration and catalyzing iron after the heavy pre-treatment, and dissolved oxygen is controlled at 0.1～2mg/L in the pond, and hydraulic detention time 5min, inner circulating reflux were than 5: 1, and copper and iron are pressed W
Cu/ W
Fe=0.5, add modified zeolite 6%, the filler porosity in the catalytic internal electrolysis of iron pond is 40%.
2. the waste water that electrolyzer comes out in the aeration and catalyzing iron enters settling tank and carries out solid-liquid separation, and sedimentation time is 2 hours, and mud discharging in a day once.
The variation of water of waste water after former technology and pilot scale processing sees Table 3, and the water outlet after the present invention handles is better than original place science and engineering skill.
Table 3
| Water-quality guideline | COD Cr(mg/L) | BOD 5(mg/L) | SS(mg/L) | TP(mg/L) |
| Water inlet | 135～450 | 70～300 | 50～350 | 2～9 |
| Former technology water outlet | 55～180 | 32～145 | ≤45 | ≤1.5 |
| Former technology clearance | ≥50％ | ≥50％ | ≥85％ | ≥83％ |
| The pilot scale water outlet | 45～128 | 25～116 | ≤40 | ≤0.9 |
| The pilot scale clearance | ≥60％ | ≥60％ | ≥85％ | ≥90％ |
Above-mentioned example shows that adopting the aeration and catalyzing iron internal electrolysis that municipal effluent is carried out primary reinforcement handles, and shorter because of required generally speaking hydraulic detention time, therefore the reaction tank volume that needs is little, and capital cost is low, and energy consumption is low; And no longer need to add in addition medicament, and it is few to produce sludge quantity, and working cost is also very low.And after aeration and catalyzing iron internal electrolysis sewage primary reinforcement disposal methods of the present invention, the SS of municipal effluent, COD
Cr, BOD
5, TP-P etc. clearance reach respectively more than 80%, 60%, 60%, 85%, phosphor-removing effect is especially remarkable.
Treatment effect of the present invention and cost are done comprehensive a comparison with general primary reinforcement treatment process, see Table 4:
Table 4 the present invention and the generally comparison of primary reinforcement treatment process
| Feature | The present invention | Hydrolysis | Preaeration | Biofloculation | Chemical flocculation |
| Reaction tank volume (floor space) | Little | Greatly | Little | Greatly | Little |
| Capital cost | Little | Greatly | Little | Greatly | Little |
| Medicament expense | Do not have | Do not have | Do not have | Do not have | Have |
| Energy consumption | Little | Little | In | Greatly | In |
| Working cost | Little | In | In | Greatly | In |
| The COD clearance | 60～80％ | 35～45％ | 25～45％ | 60～70％ | 50～70％ |
| BOD 5Clearance | 60～80％ | 30～40％ | 25～45％ | 60～70％ | 45～70％ |
| The SS clearance | ≥80％ | 70～90％ | 45～80％ | 70～90％ | 70～90％ |
| The TP clearance | ≥85％ | / | / | 20～30％ | ≥80％ |
Claims (8)
1. aeration and catalyzing iron internal electrolyzing sewage primary reinforcement treatment process, its step comprises:
A, waste water enter electrolyzer in the aeration and catalyzing iron after pre-treatment, the control by aeration rate makes dissolved oxygen concentration in the pond at 0.1～8mg/L, places iron copper mixed fillers in the pond, and the mass ratio of copper and iron is W
Cu/ W
Fe=0～0.5, work as W
Cu/ W
Fe=0 o'clock, the carbon content that requires iron was greater than 0.15%;
B, mud-water separation is carried out in the water outlet of electrolyzer in the aeration and catalyzing iron, the precipitated outlet water discharging.
2. aeration and catalyzing iron internal electrolyzing sewage primary reinforcement treatment process as claimed in claim 1 is characterized in that the waste water of step a hydraulic detention time in the electrolyzer in aeration and catalyzing iron is 5～180min.
3. aeration and catalyzing iron internal electrolyzing sewage primary reinforcement treatment process as claimed in claim 1 or 2 is characterized in that step a is provided with internal recycle, and the inner circulating reflux ratio is 0: 1～8: 1.
4. aeration and catalyzing iron internal electrolyzing sewage primary reinforcement treatment process as claimed in claim 1 or 2 is characterized in that, adding content in iron copper mixed fillers is that iron copper gross weight is 0%～20% zeolite.
5. aeration and catalyzing iron internal electrolyzing sewage primary reinforcement treatment process as claimed in claim 4 is characterized in that said zeolite is the zeolite of cats product modification.
6. aeration and catalyzing iron internal electrolyzing sewage primary reinforcement treatment process as claimed in claim 1 or 2 is characterized in that, the porosity of the interior iron copper mixed fillers of electrolyzer is 10～80% in the aeration and catalyzing iron.
7. aeration and catalyzing iron internal electrolyzing sewage primary reinforcement treatment process as claimed in claim 1 or 2 is characterized in that, the said pre-treatment of step a is meant through grid, sand setting pre-treatment.
8. aeration and catalyzing iron internal electrolyzing sewage primary reinforcement treatment process as claimed in claim 1 or 2 is characterized in that the sedimentation time of step b is 1.5～3 hours.
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|---|---|---|---|
| CNB2005100288363A CN100400433C (en) | 2005-08-16 | 2005-08-16 | Strengthened primary treatment method for internal electrolyzing sewage through aeration and catalyzing iron |
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|---|---|---|---|
| CNB2005100288363A CN100400433C (en) | 2005-08-16 | 2005-08-16 | Strengthened primary treatment method for internal electrolyzing sewage through aeration and catalyzing iron |
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| CN100400433C true CN100400433C (en) | 2008-07-09 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734826B (en) * | 2008-11-18 | 2013-01-02 | 南京理工大学 | Process method for treating coking wastewater |
| CN101913721A (en) * | 2010-05-25 | 2010-12-15 | 南京洁水科技有限公司 | Coking wastewater pretreatment method |
| CN102336454A (en) * | 2010-08-26 | 2012-02-01 | 隆润新技术发展有限公司 | Application of catalyzed inner electrolysis method in organosilicone waste water treatment |
| CN101941749B (en) * | 2010-09-27 | 2012-12-19 | 中国环境科学研究院 | Method for treating high-concentration copper-containing antibiotic wastewater and recovering copper by iron-carbon micro-electrolysis |
| CN113896312B (en) * | 2021-10-26 | 2022-09-16 | 一澄环境科技(武汉)有限公司 | Processing technology of phosphorus removal material for sewage treatment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5633423A (en) * | 1994-06-14 | 1997-05-27 | Campagnie Generale Des Matieres Nucleaires | Consumable anode, electrodissolution process applied to the decontamination of slightly radioactive liquid effluents and apparatus for performing the process |
| CN1353088A (en) * | 2000-11-09 | 2002-06-12 | 福建师范大学 | Electrochemical process for treating waste dye liquid |
| CN1382649A (en) * | 2002-05-31 | 2002-12-04 | 上海城市污染控制工程研究中心 | Process for treating used water difficult to degradate by catalytic internal electrolysis of iron |
-
2005
- 2005-08-16 CN CNB2005100288363A patent/CN100400433C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5633423A (en) * | 1994-06-14 | 1997-05-27 | Campagnie Generale Des Matieres Nucleaires | Consumable anode, electrodissolution process applied to the decontamination of slightly radioactive liquid effluents and apparatus for performing the process |
| CN1353088A (en) * | 2000-11-09 | 2002-06-12 | 福建师范大学 | Electrochemical process for treating waste dye liquid |
| CN1382649A (en) * | 2002-05-31 | 2002-12-04 | 上海城市污染控制工程研究中心 | Process for treating used water difficult to degradate by catalytic internal electrolysis of iron |
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