CN102583949A - Application of ferrate in municipal sludge conditioning - Google Patents
Application of ferrate in municipal sludge conditioning Download PDFInfo
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- CN102583949A CN102583949A CN2012100254672A CN201210025467A CN102583949A CN 102583949 A CN102583949 A CN 102583949A CN 2012100254672 A CN2012100254672 A CN 2012100254672A CN 201210025467 A CN201210025467 A CN 201210025467A CN 102583949 A CN102583949 A CN 102583949A
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Abstract
The invention discloses a municipal sludge conditioning method. The technical scheme disclosed by the invention is that: concentrating surplus sludge for 24 hours to obtain thickened sludge, and then, entering a flocculating tank; adding ferrate to the flocculating tank for preconditioning, wherein the dosage of the ferrate, i.e. the mass ratio of the ferrate to the surplus thickened sludge is (0.10-0.15):1; firstly, rapidly stirring for 1 minute at the speed of 200-250r/min; then slowly stirring for 1-4 minutes at the speed of 50r/min; and finally, adding a few polyacrylamide flocculating agent while slowing stirring at the speed of 80-100r/min to end a sludge conditioning process, wherein the dosage of the polyacrylamide flocculating agent is 0.10-0.20 percent (dry basis). According to the method disclosed by the invention, the bound water content of the surplus sludge can be reduced, and the specific filtration resistance of the sludge can be reduced, and thereby, sludge dewatering is promoted, and the use level of the flocculating agent is reduced. The method disclosed by the invention also has the advantages of simple equipment, no investment, no toxin, environmental protection, convenience in operation management, low operating cost and the like, and is suitable for being applied to industrial sewage and urban domestic sewage treatment plants.
Description
Technical field
The present invention relates to a kind of perferrate conditioning mud that utilizes, improve the dehydration property of mud, thereby make the method for mud decrement.The process field that belongs to sewage sludge is specifically related to a kind of application of industrial solid castoff.
Background technology
Biological sewage treatment method based on active sludge is most widely used in the world at present dirty water living creature processing technique, but there is the drawback of a maximum in it always, can produce a large amount of excess sludges exactly.Because the aggregate that zoogloea that mud is formed by multiple mikrobe and adsorbed organic matter and inorganics are formed; Has special flco structure and highly hydrophilic; Water ratio is usually 95～99.9%, and is bulky, become the heavy economical load of sewage work.For reducing sludge volume, must carry out processed to mud, removal moisture as much as possible in dehydration obtains the high sludge cake of solid content, and this disposes all quite important to follow-up transportation and sludge treatment.Sludge dewatering is the valid approach of sludge reduction, and sludge dewatering efficient directly influences sludge reduction, stabilization, innoxious, recycling treatment.In sludge treatment methods of disposal such as burning, compost, landfill, comprehensive utilization, sludge dewatering is most important pre-treatment process, becomes economy, efficiently handles the bottleneck of mud.Then, mud has similar colloidal rock steady structure, and a large amount of combination water that comprises in the mud flco is difficult to slough, and causes the specific drainage pressure of mud big, and dewatering is poor, and dehydration is difficulty very.For destroying its colloidal structure, improve the dewatering of mud, must nurse one's health mud.The Opsonizing method of mud has chemical conditioning method, physical modulated logos, biological modulated logos three major types; And the chemical conditioning method is the method for present most popular conditioning municipal sludge, and it adopts the chemical agent (like molysite, aluminium salt, polyelectrolyte etc.) with coagulation to nurse one's health mud.Though price own is lower, coagulating efficient is low, causes dosage big for low-molecular inorganic coagulating agent (molysite, aluminium salt etc.), and processing costs is high, but also makes that the post precipitation sludge quantity is big, increases subsequent disposal and disposes difficulty.The organic polymer coagulating agent, like SEPIGEL 305, though coagulation efficiency is good, price own is high, and monomer whose has toxicity, and residue is difficult for being prone to cause secondary pollution by biological degradation.Though mud rate of water loss after conditioning is accelerated, still water ratio is high in the mud cake after the sludge dewatering.All mechanical dehydration methods can only make the dewatered sludge water ratio be reduced to about 75～80%, are difficult to further reduce again again.How, become the difficult point and the focus of domestic and international water treatment research field reducing flocculation agent or not increasing the dehydration property that improves mud under the prerequisite of flocculation agent consumption.
Summary of the invention
The objective of the invention is to deficiency to prior art; A kind of method of utilizing ferrate oxidation preconditioned mud is provided; This method not only can further improve the efficient and the stability of sludge dewatering, also can reduce the polyacrylamide flocculant consumption, reduces the cost of sludge dewatering.
For realizing above-mentioned purpose, the present invention is with mud elder generation and perferrate generation oxidizing reaction, with the outer polymer of the peripheral born of the same parents of ferrate oxidation mud flco; The colloidal structure that decomposes mud; Discharge the combination water in the mud flco, product-Fe3+ that oxidizing reaction produces is a kind of flocculation agent, can improve the flocculating settling performance of mud; Reach the purpose that promotes sludge dewatering, thereby reduce sludge quantity.
Nurse one's health mud with perferrate, promote the sludge reduction method of excess sludge dehydration, it is characterized in that excess sludge concentrated through 24 hours after; Thickened sludge gets into the flocculation jar; In the flocculation jar, add the perferrate preconditioned earlier, stir at a slow speed again after stirring fast, look the nature difference of excess sludge then; Add a small amount of polyacrylamide flocculant again, accomplish conditioning process mud.
Wherein the time of mud and ferrate oxidation preconditioned is 2～5 minutes; Stirring velocity is 200～250r/min fast, and churning time is 1 minute fast; Stirring velocity is 50～80r/min at a slow speed, and churning time is 1～4 minute at a slow speed.The dosage of perferrate (being perferrate and the mass ratio that remains thickened sludge) is 0.10～0.15: 1.Under 80～100r/min stirs at a slow speed, add a small amount of polyacrylamide flocculant at last, the dosage of polyacrylamide flocculant is 0.10～0.20% (butt).The perferrate of different sorts mud and the best of polyacrylamide flocculant add dosage maybe be different, and this is relevant with the character of excess sludge etc.Dosage is excessive, the preconditioned overlong time but perferrate adds, can be because the mud cell crack, and intracellular organic matter is excessive, can cause the flocculation dewatering degradation of mud on the contrary.
The present invention improves existing sludge conditioning method, and the method after the improvement can reduce the combination water content of excess sludge, reduces the sludge filtration resistivity, thereby promotes sludge dewatering, reduces the flocculation agent consumption.Method of the present invention has that equipment is simple, less investment, pollution-free, advantage such as operational management convenient, running cost is low, is fit to industrial sewage and the application of town domestic sewage treatment plant.
Marked improvement of the present invention and advantage are:
(1) promotes the mud flocculation dewatering.The combination water content of mud drops to about 1.2g/g from 16.8g/g, the specific drainage pressure of mud about 1 one magnitude that descends.Moisture percentage in sewage sludge can drop to about 70% after the press filtration by original 99%, and sludge volume significantly reduces, and has reduced the difficulty that follow-up sludge treatment is disposed, and has alleviated the pressure of landfill or burning, and disposal costs significantly reduces.
(2) the flocculation agent consumption is reduced to 0.10～0.20% (butt) from 0.7% (butt), practices thrift great amount of cost.
(3) need not to build in addition any treatment facility, do not have investment, convenient management, asepsis environment-protecting, running cost is lower.
Specific embodiments
Below in conjunction with embodiment technical scheme of the present invention is done further to describe.Following examples do not constitute qualification to technical scheme of the present invention.
Embodiment 1: adopt method of the present invention that the excess sludge of Ningbo sewage work is nursed one's health, the water ratio of mud is 99.7%, and normal temperature is operation down.The mass ratio of potassium ferrate and excess sludge is 0.1: 1, add potassium ferrate after, first 200r/min stirred 1 minute fast; 50r/min stirred at a slow speed 3 minutes then; Mud after the preconditioned adds the small amount of flocculant SEPIGEL 305; Consumption is 0.15% (butt), filter-press dehydration then, and the water ratio that records sludge cake is 69%; The combination water content of mud drops to about 1.2g/g from 16.8g/g, and the mud resistivity is from 4.51 * 10
11M/kg is reduced to 0.47 * 10
11M/kg.And do not pass through the mud of potassium ferrate preconditioned, and be 78% through the moisture content of the cake behind the filter-press dehydration, the mud resistivity is 1.39 * 10
11M/kg, the consumption of flocculation agent SEPIGEL 305 are 0.7% (butt).
Embodiment 2: adopt method of the present invention that the excess sludge of Ningbo sewage work is nursed one's health, sludge settling was removed supernatant after 2 hours, and the water ratio that records mud is 98.5%, and normal temperature is operation down.The mass ratio of potassium ferrate and excess sludge is 0.15: 1, add potassium ferrate after, first 250r/min stirred 1 minute fast; 80r/min stirred at a slow speed 4 minutes then, and the mud after the preconditioned adds the small amount of flocculant SEPIGEL 305, and consumption is 0.10% (butt), filter-press dehydration then, and the water ratio that records sludge cake is 70%, the mud resistivity is from 4.12 * 10
11M/kg is reduced to 0.57 * 10
11M/kg, and the mud of not handling through potassium ferrate is 78% through the moisture percentage in sewage sludge behind the filter-press dehydration, the mud resistivity is 1.51 * 10
11M/kg, the consumption of flocculation agent SEPIGEL 305 are 0.7% (butt).
Embodiment 3: adopt method of the present invention that the industrial excess sludge of the sewage works generation of Ningbo petroleum chemical enterprise is nursed one's health, sludge settling was removed supernatant after 2 hours, and the water ratio that records mud is 98.5%, and normal temperature is operation down.The mass ratio of potassium ferrate and excess sludge is 0.15: 1, add potassium ferrate after, first 250r/min stirred 1 minute fast; 60r/min stirred at a slow speed 4 minutes then, and the mud after the conditioning adds the small amount of flocculant SEPIGEL 305, and consumption is 0.20% (butt), filter-press dehydration then, and the water ratio that records sludge cake is 70%, the mud resistivity is from 4.77 * 10
11M/kg is reduced to 0.42 * 10
11M/kg.And the mud of not handling through potassium ferrate is 82% through the sludge cake water ratio behind the filter-press dehydration, and the mud resistivity is 1.49 * 10
11M/kg, the consumption of flocculation agent SEPIGEL 305 are 0.7% (butt).
Claims (6)
1. the application of perferrate in urban sludge conditioning is characterized in that may further comprise the steps: excess sludge is through about 24 hours concentrate, and thickened sludge gets into flocculation jar, in flocculation jar, adds the perferrate preconditioned earlier, stirs 1 minute fast earlier; Stirred at a slow speed again 1～4 minute, and then add a small amount of polyacrylamide flocculant, accomplish conditioning process mud.
2. method according to claim 1 is characterized in that the dosage (being perferrate and the mass ratio that remains thickened sludge) of perferrate is 0.10～0.15: 1.
3. method according to claim 1 is characterized in that quick stirring velocity is 200～250r/min, and churning time is 1 minute fast.
4. method according to claim 1 is characterized in that stirring velocity is 50～80r/min at a slow speed, and churning time is 1～4 minute at a slow speed.
5. method according to claim 1, the dosage that it is characterized in that polyacrylamide flocculant are 0.10～0.20% (butt).
6. method according to claim 1 is characterized in that perferrate, can be potassium ferrate, also can be Na2Fe04.
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| CN2012100254672A CN102583949A (en) | 2012-01-16 | 2012-01-16 | Application of ferrate in municipal sludge conditioning |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104973750A (en) * | 2015-06-29 | 2015-10-14 | 北京工业大学 | Combined conditioning method for sludge high-efficient dehydration |
| CN108383236A (en) * | 2018-03-30 | 2018-08-10 | 哈尔滨工业大学 | A method of microorganism flco is activated to improve cohesion and dephosphorization performance using ferrate |
| CN110183092A (en) * | 2019-04-10 | 2019-08-30 | 北京中持净水材料技术有限公司 | A kind of efficient anaerobic digested sludge deep dehydration conditioner and its application method |
| CN115814760A (en) * | 2023-01-09 | 2023-03-21 | 重庆三峡学院 | Preparation and application of sludge biochar |
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| CN101200343A (en) * | 2006-12-13 | 2008-06-18 | 天津科技大学 | High-effective sludge dehydration process |
| CN101503237A (en) * | 2009-03-18 | 2009-08-12 | 南京大学 | Chemical reagent combination and use thereof in sharp separation and water quality purification |
| CN101687720A (en) * | 2007-02-16 | 2010-03-31 | 维塔格公司 | Be used to the method handling mud and produce the mineral manure of biological organic enhanced high nitrogen-containing |
| CN101695649A (en) * | 2009-11-09 | 2010-04-21 | 湖南大学 | Modified flyash as well as preparation method and application thereof in urban sludge conditioning |
| CN101955249A (en) * | 2010-05-12 | 2011-01-26 | 合肥富通机电自动化有限公司 | Preparation method of dehydrating agent special for cow dung |
| WO2011119753A2 (en) * | 2010-03-23 | 2011-09-29 | University Of Utah Research Foundation | Methods for deactivating biomass |
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2012
- 2012-01-16 CN CN2012100254672A patent/CN102583949A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101200343A (en) * | 2006-12-13 | 2008-06-18 | 天津科技大学 | High-effective sludge dehydration process |
| CN101687720A (en) * | 2007-02-16 | 2010-03-31 | 维塔格公司 | Be used to the method handling mud and produce the mineral manure of biological organic enhanced high nitrogen-containing |
| CN101503237A (en) * | 2009-03-18 | 2009-08-12 | 南京大学 | Chemical reagent combination and use thereof in sharp separation and water quality purification |
| CN101695649A (en) * | 2009-11-09 | 2010-04-21 | 湖南大学 | Modified flyash as well as preparation method and application thereof in urban sludge conditioning |
| WO2011119753A2 (en) * | 2010-03-23 | 2011-09-29 | University Of Utah Research Foundation | Methods for deactivating biomass |
| CN101955249A (en) * | 2010-05-12 | 2011-01-26 | 合肥富通机电自动化有限公司 | Preparation method of dehydrating agent special for cow dung |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104973750A (en) * | 2015-06-29 | 2015-10-14 | 北京工业大学 | Combined conditioning method for sludge high-efficient dehydration |
| CN108383236A (en) * | 2018-03-30 | 2018-08-10 | 哈尔滨工业大学 | A method of microorganism flco is activated to improve cohesion and dephosphorization performance using ferrate |
| CN108383236B (en) * | 2018-03-30 | 2022-02-11 | 哈尔滨工业大学 | Method for improving coagulation and dephosphorization performance by activating microbial flocs with ferrate |
| CN110183092A (en) * | 2019-04-10 | 2019-08-30 | 北京中持净水材料技术有限公司 | A kind of efficient anaerobic digested sludge deep dehydration conditioner and its application method |
| CN115814760A (en) * | 2023-01-09 | 2023-03-21 | 重庆三峡学院 | Preparation and application of sludge biochar |
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Application publication date: 20120718 |