CN103274578B - Surplus sludge dewatering method for aerobic granular sludge reactor - Google Patents
Surplus sludge dewatering method for aerobic granular sludge reactor Download PDFInfo
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- CN103274578B CN103274578B CN201310251554.4A CN201310251554A CN103274578B CN 103274578 B CN103274578 B CN 103274578B CN 201310251554 A CN201310251554 A CN 201310251554A CN 103274578 B CN103274578 B CN 103274578B
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Abstract
A surplus sludge dewatering method for an aerobic granular sludge reactor relates to a surplus sludge dewatering method. The method provided by the invention is to solve the technical problems in the existing surplus sludge dewatering method that the sludge dewatering effect is poor, the amount of CPAM (cationic polyacrylamide) is large, and the volume of supernatant is few after sedimentation for one hour. The method provided by the invention is as follows: 1, the surplus elutriated sludge in the aerobic granular sludge reactor is concentrated to remove the supernatant, and then aluminium polychlorid and cationic polyacrylamide solution are added; 2, the sulfuric acid modified fly ash is prepared; 3, the sulfuric acid modified fly ash and CaO are fed into the treated sludge to get the well-conditioned sludge; 4, the well-conditioned sludge is sucked into a plate-and-frame filter press to conduct mechanical dewatering after standing, and then the pressure is released to discharge so as to finish dewatering the surplus sludge. The moisture content of the dewatered sludge is less than 60%, and the volume of the supernatant is up to 25% to 35% after sediment after sludge conditioning. The surplus sludge dewatering method is applied to the field of treatment of surplus sludge.
Description
Technical field
The present invention relates to a kind of method of excess sludge dehydration.
Background technology
Along with the quickening of China's Development of China's Urbanization, a large amount of constructions of town sewage plant have caused sewage plant excess sludge amount to roll up, China has built up thousands of sewage works at present, the excess sludge that every day will be discharged water ratio approximately 99.2% by Mei Zuo sewage work reaches tons hundreds of and even up to ten thousand, annual sludge yield exceedes 3,000 ten thousand tons, due to the phenomenon of wastewater treatment in China factory ubiquity " the light mud of heavy water ", most of mud is not dealt carefully with, although sludge creation amount only accounts for 1%～2% of sewage disposal total amount, but comprise 50%～80% pollutant load, this has brought huge hidden danger to ecotope.The mud of these enormous amount will become a difficult problem following in need of immediate treatment.And that sludge treatment expense generally accounts for the half of whole sewage work working cost is even more, so, seek perfect sludge treatment scheme, be to reduce Sewage Plant running cost, solve one of main path of sludge problem.
Traditional sludge dewatering technology comprises concentrated, dehydration and the dry three aspects: of mud, domestic existing be the concentrated and dehydration technique of mud substantially.Common excess sludge organic content is high, complicated components, variability is large, particle is little and water ratio high (common more than 99%), dewaters very difficult, and excess sludge is after concentrated and dehydration, and general water ratio can only be reduced to 80% left and right.This also becomes the bottleneck problem of sludge treatment.Therefore, how to improve dewatering, the reduction moisture content of the cake of mud, be an important research topic always.
Aerobic Granular Sludge Technology has become one of the study hotspot in biological sewage treatment field at present, and it has made up many weak points of traditional activated sludge process.Its maximum advantage of aerobic particle mud is the characteristic that particle diameter is large, settling property good and have synchronous denitrification dephosphorizing, and in effectively removing pollutent, mud construction features are conducive to improve the dewatering of mud.The research of aerobic particle mud is mainly concentrated on to granule sludge cultivation and the law of purification to each pollutant both at home and abroad at present, research to aerobic granular sludge reactor excess sludge dehydration aspect is few, in practical study, find that aerobic granular sludge reactor can produce a large amount of elutriation mud in operational process, the excess sludge that simultaneous reactions device produces is also mainly to eluriate mud as main, in fact this class mud granule is tiny belongs to granule sludge broken or that disintegrate, water ratio is greater than 97%, mud wet density 1.016g/mL, sludge specific resistance 13.30 × 10
8s
2/ g is the main object of sludge treatment.
At present China overwhelming majority's aerobic particle mud is after gravity concentration, nitrated, this set of simple art breading of mechanical dehydration, and the water ratio of mud only drops to 80% left and right, sludge dewatering weak effect; CPAM is expensive, but sludge treatment effect stability is reliable, and in sewage work, CPAM dosage is generally 25～30mg/L, and CPAM dosage is large; After sludge settling 1h, supernatant liquor volume is 12%～20%, and after sedimentation 1h, supernatant liquor volume is few.15～20mg/L
Summary of the invention
The present invention will solve the sludge dewatering weak effect that the dewatering of existing residue aerobic particle mud exists, CPAM dosage is large, the few technical problem of supernatant liquor volume after sedimentation 1h, thereby a kind of method that provides excess sludge for aerobic granular sludge reactor to dewater.
The method of a kind of dehydration of the excess sludge for aerobic granular sludge reactor of the present invention is to carry out according to the following steps:
One, getting 1～2L water ratio is that the residue of 97.8% aerobic granular sludge reactor is eluriated mud, after concentrated 1～4h, remove supernatant liquor, in mud, add the polymerize aluminum chloride (PAC) of 80～150mg, stirring reaction 1～2min, flocculation agent cationic polyacrylamide (CPAM) solution that the concentration that continues interpolation 15～25mg is 0.05%, stirring reaction 1～2min;
Two, flyash is crossed after 200 mesh sieves, be immersed in the sulfuric acid that volumetric molar concentration is 1～5mol/L, use magnetic stirrer to stir 1～2 hour with the speed of 30～50r/min, then in the baking oven of 100～120 DEG C, dry 2～4 hours, prepare sulfuric acid modified flyash; Wherein, the mass volume ratio of flyash and sulfuric acid is 1g: 3～5L;
Three, the sulfuric acid modified flyash of preparing to the step 2 that adds 1000～1500mg in step 1 mud after treatment, stirring reaction 1～2min, then to the CaO that adds 1000～1500mg in mud, stirring reaction 1～2min, the mud that obtains modulating;
Four, leave standstill after 30～60min, mud step 3 being modulated by Variable plunger pump sucks plate-and-frame filter press to carry out after mechanical dehydration, and release blowing completes the excess sludge dehydration for aerobic granular sludge reactor; Wherein, the pressure of mechanical dehydration is 1.0～2.0MPa, and the time of mechanical dehydration is 45～60min.
The present invention includes following beneficial effect:
1, the present invention PAC used mainly plays strong charge neutrality effect to water-borne glue body material and the bridge formation adsorption to suspended matter in sludge dewatering; Polyacrylamide has flocculence, binding property, falls resistive and thickening property, is the most frequently used sludge flocculation agent of Sewage Plant; The ability that inorganic particle flyash has absorption and fills mud; Calcium oxide is combined with flyash while adding, can produce alkali excitation to flyash as coagulant aids, generates gelation product, and mud is played to adsorption bridging and sweep coagulation effect;
2, the present invention is directed to the excess sludge producing in aerobic granular sludge reactor operational process, by the complex art route of economical rationality, seek optimum sludge flocculation dehydration, improve the flocculating effect of excess sludge, and then improve the degree of dehydration of follow-up mechanical dehydration device, so that the moisture percentage in sewage sludge after dehydration drops to below 60% by common 80%, improve sludge dewatering effect, for the ultimate disposal of sewage sludge harmlessness and resource utilization provides reliable guarantee;
3, the present invention is by optimizing medicament proportioning, and CPAM dosage can further reduce, and in the time that CPAM usage quantity is 15mg/L, dehydrating effect is best, granular sludge reactor can be eluriated to sludge specific resistance and be reduced to 0.2 × 10
8～0.4 × 10
8s
2/ g;
4, the present invention, adopting corresponding amendment, reaches 25%～35% through sedimentation supernatant liquor volume after sludge conditioning, for the subsequent disposal of mud has reduced cost.
Embodiment
Embodiment one: the method for a kind of dehydration of the excess sludge for aerobic granular sludge reactor of present embodiment is to carry out according to the following steps:
One, getting 1～2L water ratio is that the residue of 97.8% aerobic granular sludge reactor is eluriated mud, after concentrated 1～4h, remove supernatant liquor, in mud, add the polymerize aluminum chloride (PAC) of 80～150mg, stirring reaction 1～2min, flocculation agent cationic polyacrylamide (CPAM) solution that the concentration that continues interpolation 15～25mg is 0.05%, stirring reaction 1～2min;
Two, flyash is crossed after 200 mesh sieves, be immersed in the sulfuric acid that volumetric molar concentration is 1～5mol/L, use magnetic stirrer to stir 1～2 hour with the speed of 30～50r/min, then in the baking oven of 100～120 DEG C, dry 2～4 hours, prepare sulfuric acid modified flyash; Wherein, the mass volume ratio of flyash and sulfuric acid is 1g: 3～5L;
Three, the sulfuric acid modified flyash of preparing to the step 2 that adds 1000～1500mg in step 1 mud after treatment, stirring reaction 1～2min, then to the CaO that adds 1000～1500mg in mud, stirring reaction 1～2min, the mud that obtains modulating;
Four, leave standstill after 30～60min, mud step 3 being modulated by Variable plunger pump sucks plate-and-frame filter press to carry out after mechanical dehydration, and release blowing completes the excess sludge dehydration for aerobic granular sludge reactor; Wherein, the pressure of mechanical dehydration is 1.0～2.0MPa, and the time of mechanical dehydration is 45～60min.
Present embodiment comprises following beneficial effect:
1, present embodiment PAC used mainly plays strong charge neutrality effect to water-borne glue body material and the bridge formation adsorption to suspended matter in sludge dewatering; Polyacrylamide has flocculence, binding property, falls resistive and thickening property, is the most frequently used sludge flocculation agent of Sewage Plant; The ability that inorganic particle flyash has absorption and fills mud; Calcium oxide is combined with flyash while adding, can produce alkali excitation to flyash as coagulant aids, generates gelation product, and mud is played to adsorption bridging and sweep coagulation effect;
2, present embodiment is for the excess sludge producing in aerobic granular sludge reactor operational process, by the complex art route of economical rationality, seek optimum sludge flocculation dehydration, improve the flocculating effect of excess sludge, and then improve the degree of dehydration of follow-up mechanical dehydration device, so that the moisture percentage in sewage sludge after dehydration drops to below 60% by common 80%, improve sludge dewatering effect, for the ultimate disposal of sewage sludge harmlessness and resource utilization provides reliable guarantee;
3, present embodiment is by optimizing medicament proportioning, and CPAM dosage can further reduce, and in the time that CPAM usage quantity is 15mg/L, dehydrating effect is best, granular sludge reactor can be eluriated to sludge specific resistance and be reduced to 0.2 × 10
8～0.4 × 10
8s
2/ g;
4, present embodiment, adopting corresponding amendment, reaches 25%～35% through sedimentation supernatant liquor volume after sludge conditioning, for the subsequent disposal of mud has reduced cost.
Embodiment two: present embodiment is different from embodiment one: concentrated 1h in step 1.Other is identical with embodiment one.
Embodiment three: present embodiment is different from embodiment one or two: the speed with 30r/min in step 2 stirs 2 hours.Other is identical with embodiment one or two.
Embodiment four: present embodiment is different from one of embodiment one to three: dry in the baking oven of 105 DEG C 2 hours in step 2.Other is identical with one of embodiment one to three.
Embodiment five: present embodiment is different from one of embodiment one to four: in step 2, the mass volume ratio of flyash and sulfuric acid is 1g: 3L.Other is identical with one of embodiment one to four.
Embodiment six: present embodiment is different from one of embodiment one to five: leave standstill 60min in step 4.Other is identical with one of embodiment one to five.
Embodiment seven: present embodiment is different from one of embodiment one to six: in step 4, the pressure of mechanical dehydration is 1.2～1.5MPa.Other is identical with one of embodiment one to six.
By following verification experimental verification beneficial effect of the present invention:
Test one: the method for a kind of dehydration of the excess sludge for aerobic granular sludge reactor of this test is by following realization:
One, getting 1L water ratio is that the residue of 97.8% aerobic granular sludge reactor is eluriated mud, after concentrated 1h, remove supernatant liquor, in mud, add the polymerize aluminum chloride (PAC) of 90mg, stirring reaction 2min, flocculation agent cationic polyacrylamide (CPAM) solution that the concentration that continues interpolation 15mg is 0.05%, stirring reaction 2min;
Two, flyash is crossed after 200 mesh sieves, be immersed in the sulfuric acid that volumetric molar concentration is 4mol/L, use magnetic stirrer to stir 2 hours with the speed of 30r/min, the baking oven of then putting into 105 DEG C is dried 2 hours, prepares sulfuric acid modified flyash; Wherein, the mass volume ratio of flyash and sulfuric acid is 1g: 3L;
Three, the sulfuric acid modified flyash of preparing to the step 2 that adds 1000mg in step 1 mud after treatment, stirring reaction 2min, then to the CaO that adds 1000mg in mud, stirring reaction 2min, the mud that obtains modulating;
Four, leave standstill after 60min, mud step 3 being modulated by Variable plunger pump sucks plate-and-frame filter press to carry out after mechanical dehydration, and release blowing completes the excess sludge dehydration for aerobic granular sludge reactor; Wherein, the pressure of mechanical dehydration is 1.2MPa, and the time of mechanical dehydration is 60min.
Moisture percentage in sewage sludge after this test dehydration is 60%, and elutriation sludge specific resistance is reduced to 0.26 × 10
8s
2/ g, reaches 35% through sedimentation supernatant liquor volume after sludge conditioning.
Test two: the method for a kind of dehydration of the excess sludge for aerobic granular sludge reactor of this test is by following realization:
One, getting 1L water ratio is that the residue of 97.8% aerobic granular sludge reactor is eluriated mud, after concentrated 1h, remove supernatant liquor, in mud, add the polymerize aluminum chloride (PAC) of 90mg, stirring reaction 2min, flocculation agent cationic polyacrylamide (CPAM) solution that the concentration that continues interpolation 15mg is 0.05%, stirring reaction 2min;
Two, flyash is crossed after 200 mesh sieves, be immersed in the sulfuric acid that volumetric molar concentration is 4mol/L, use magnetic stirrer to stir 2 hours with the speed of 30r/min, the baking oven of then putting into 105 DEG C is dried 2 hours, prepares sulfuric acid modified flyash; Wherein, the mass volume ratio of flyash and sulfuric acid is 1g: 3L;
Three, the sulfuric acid modified flyash of preparing to the step 2 that adds 1000mg in step 1 mud after treatment, stirring reaction 2min, then to the CaO that adds 1000mg in mud, stirring reaction 2min, the mud that obtains modulating;
Four, leave standstill after 60min, mud step 3 being modulated by Variable plunger pump sucks plate-and-frame filter press to carry out after mechanical dehydration, and release blowing completes the excess sludge dehydration for aerobic granular sludge reactor; Wherein, the pressure of mechanical dehydration is 1.5MPa, and the time of mechanical dehydration is 45min.
Moisture percentage in sewage sludge after this test dehydration is 60%, and elutriation sludge specific resistance is reduced to 0.29 × 10
8s
2/ g, reaches 30% through sedimentation supernatant liquor volume after sludge conditioning.
Claims (7)
1. a method of dewatering for the excess sludge of aerobic granular sludge reactor, is characterized in that the method for dewatering for the excess sludge of aerobic granular sludge reactor is to carry out according to the following steps:
One, getting 1～2L water ratio is that the residue of 97.8% aerobic granular sludge reactor is eluriated mud, after concentrated 1～4h, remove supernatant liquor, in mud, add the polymerize aluminum chloride of 80～150mg, stirring reaction 1～2min, the flocculation agent cationic polyacrylamide solution that the concentration that continues interpolation 15mg is 0.05%, stirring reaction 1～2min;
Two, flyash is crossed after 200 mesh sieves, be immersed in the sulfuric acid that volumetric molar concentration is 1～5mol/L, use magnetic stirrer to stir 1～2 hour with the speed of 30～50r/min, then in the baking oven of 100～120 DEG C, dry 2～4 hours, prepare sulfuric acid modified flyash; Wherein, the mass volume ratio of flyash and sulfuric acid is 1g: 3～5L;
Three, the sulfuric acid modified flyash of preparing to the step 2 that adds 1000～1500mg in step 1 mud after treatment, stirring reaction 1～2min, then to the CaO that adds 1000～1500mg in mud, stirring reaction 1～2min, the mud that obtains modulating;
Four, leave standstill after 30～60min, mud step 3 being modulated by Variable plunger pump sucks plate-and-frame filter press to carry out after mechanical dehydration, and release blowing completes the excess sludge dehydration for aerobic granular sludge reactor; Wherein, the pressure of mechanical dehydration is 1.0～2.0MPa, and the time of mechanical dehydration is 45～60min.
2. the method for a kind of dehydration of the excess sludge for aerobic granular sludge reactor according to claim 1, is characterized in that concentrated 1h in step 1.
3. the method for a kind of dehydration of the excess sludge for aerobic granular sludge reactor according to claim 1, is characterized in that in step 2, the speed with 30r/min stirs 2 hours.
4. the method for a kind of dehydration of the excess sludge for aerobic granular sludge reactor according to claim 1, is characterized in that in the baking oven of 105 DEG C, drying 2 hours in step 2.
5. the method for a kind of excess sludge for aerobic granular sludge reactor dehydration according to claim 1, is characterized in that in step 2, the mass volume ratio of flyash and sulfuric acid is 1g: 3L.
6. the method for a kind of dehydration of the excess sludge for aerobic granular sludge reactor according to claim 1, is characterized in that standing 60min in step 4.
7. the method for a kind of dehydration of the excess sludge for aerobic granular sludge reactor according to claim 1, the pressure that it is characterized in that mechanical dehydration in step 4 is 1.2～1.5MPa.
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| CN103865626B (en) * | 2014-03-11 | 2015-11-18 | 重庆工商大学 | A kind of anacidity alkali reclaiming process of useless machinery oil |
| CN104058568B (en) * | 2014-07-01 | 2015-09-30 | 彭宏方 | A kind of mud process for treating sludge |
| CN104193135B (en) * | 2014-09-18 | 2016-08-17 | 山东大学 | Deep dehydration method for sludge |
| CN107043170A (en) * | 2017-04-18 | 2017-08-15 | 中国矿业大学 | One kind traps CO in aerobic water treatment procedure2Method |
| CN115365280B (en) * | 2022-10-25 | 2023-10-20 | 江苏富淼科技股份有限公司 | Modified plant ash, modification method and application thereof |
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|---|---|---|---|---|
| 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 |
| CN102826733A (en) * | 2012-07-19 | 2012-12-19 | 南京林业大学 | Method for efficiently dewatering of sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN102826733A (en) * | 2012-07-19 | 2012-12-19 | 南京林业大学 | Method for efficiently dewatering of sludge |
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