CN105174668A - Sludge thermal-alkali pretreatment, separation and liquid-state fermentation method for improving production rate of organic acid - Google Patents
Sludge thermal-alkali pretreatment, separation and liquid-state fermentation method for improving production rate of organic acid Download PDFInfo
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- CN105174668A CN105174668A CN201510613700.2A CN201510613700A CN105174668A CN 105174668 A CN105174668 A CN 105174668A CN 201510613700 A CN201510613700 A CN 201510613700A CN 105174668 A CN105174668 A CN 105174668A
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Abstract
The invention provides a sludge treatment method. The sludge treatment method comprises the following steps of conducting thermal-alkali pretreatment on sludge so as to enable a solid-state carbon source in the sludge to dissolve in a liquid phase and conducting solid-liquid separation on the sludge subjected to the thermal-alkali pretreatment to obtain supernate. The invention further provides a method for utilizing sludge to produce fatty acid. The method comprises the steps of using the supernate obtained through the sludge treatment method as a substrate and performing anaerobic fermentation in an anaerobic reactor to produce the fatty acid.
Description
Technical field:
The invention belongs to organic solid castoff resource utilization field, particularly, relate to a kind of method that sludge hot oxygenation pretreatment liquid state fermentation improves organic acid productivity, it is applicable to Wood Adhesives from Biomass is voltaile fatty acid.
Background technology:
The approach that city excess sludge anaerobically fermenting utilizes as a kind of recycling sludge, is applied in many Sewage Plant.Sludge anaerobic fermentation to produce species is more, and the technology of existing application mainly contains fermentation methane production and anaerobic acid-production technology, and it is long to produce the biogas technology cycle of operation, and productive rate is on the low side, and substrate conversion efficiency is lower, uneconomical economically.Voltaile fatty acid, as the intermediate product of anaerobically fermenting, as the additional carbon strengthening denitrogenation dephosphorization technique of Sewage Plant, also as the raw material of other Industrial products, can have good economic benefit.
But Sewage Plant dewatered sludge solid content is too high, not diluted fermentation can be difficult to stir because viscosity is excessive and causes retort blocking etc. thus interrupt fermenting, and therefore, high concentration sludge anaerobically fermenting is difficult to realize scale operation always.And the mode of China's existing anaerobic sludge digestion technology many employings sequence batch fermentation, during fermentation, the solid content of mud is lower, and therefore reactor volume is huge, long operational time, and the output of product is on the low side.Based on above 2 points, city excess sludge anaerobic fermentation technology is subject to very big restriction.Relative to solid state fermentation, liquid state fermentation can process the higher sewage of organic concentrations, run duration stirring intensity is low, energy consumption is little, substrate not easily causes localized accumulated and suppresses subsequent fermentation, and be conducive to the continuous operation of reactor, put forward high acid efficiency, this is to the anaerobically fermenting efficiency important in inhibiting improving sludge concentration.
Mud solid content is higher, belongs to non-Newtonian fluid, and is not suitable for the anaerobic reactor for the treatment of liq, therefore, mud solid state fermentation is converted into liquid state fermentation, and to raising anaerobic sludge digestion speed, to improve organic loading significant.Sludge pre-treatment techniques is a kind of problem of extensive research, prior art mainly comprises thermal treatment, ultrasonication, acid-alkali treatment etc., can the organism major part in mud be dissolved in liquid phase, realize sludge treatment by the conversion of solid fermentation to liquid state fermentation, increase the available organism amount of microorganism, accelerate the hydrolysis rate of substrate.
High solids content sludge solid state fermentation is converted into liquid state fermentation by the present invention, systematically solves high solid mud and stir the problems such as difficulty, long operational time in anaerobic fermentation process; Realize high-level efficiency and produce voltaile fatty acid, and do not need in fermenting process to stir, easy to operate, there is the advantages such as energy consumption is low, output is high, fermentation period is short, production intensity is large.
Summary of the invention
Present method provides a kind of method of high-level efficiency continuous seepage voltaile fatty acid, described method is passed through alkaline Pretreatment mud solid-liquid separation, utilize the supernatant liquor after being separated to join in upflowing sludge anaerobic reactor to ferment, improve and produce the efficiency of voltaile fatty acid, for the fermentation of high solid sludge anaerobic provide a kind of newly, the method for resource continuous utilization more at a high speed.
In order to solve the problem existing for the acid of traditional sludge Produced by Solid-state Fermentation, technical scheme of the present invention is:
A kind of method improving organic acid productivity based on separated sludge hydrolyzed solution and liquid state fermentation, comprise certain density city excess sludge first through strengthening liquefaction processing, organism in solid phase is dissolved in liquid phase as far as possible, then mud solid-liquid separation is carried out, liquefaction processing parting liquid is fermented, produce the product based on voltaile fatty acid, specifically comprise the following steps:
(1) mud liquefaction processing and solid-liquid separation: by solid content be 5 ~ 20% city excess sludge carry out liquefaction processing (alkaline Pretreatment pH be 10 ~ 12, temperature is 90 ~ 105 DEG C, pretreatment time is 18 ~ 24h), make SCOD in liquid state (resolvable chemical oxygen demand) dissolution rate reach more than 70%.Mud is after liquefaction processing, and supernatant liquor is required fermentation substrate, and after liquefaction processing and solid-liquid separation, supernatant liquor SS (suspended solid) is lower than 10g/L.
(2) anaerobically fermenting: the granule sludge that interpolation has been tamed, to high-rate anaerobic reactor, adds the liquefaction processing parting liquid being rich in organic substrates afterwards, controlling reactor pH is 7-11, containing the target product based on voltaile fatty acid in fermented liquid.
Beneficial effect of the present invention: utilize organic solid castoff to do raw material, and promote that the organism in solid is dissolved in liquid by liquefaction processing, liquefaction processing supernatant liquor is isolated after sludge settling, mud liquefaction treatment solution joins anaerobically fermenting in the anaerobic reactor of inoculation domestication granule sludge, obtains high value-added product voltaile fatty acid.Advantage is as follows:
The first, realize reclaiming high value added product from difficult solid waste, achieve organic solid castoff recycling;
Second, promote the organic matter in solid waste, particularly while the organic a large amount of stripping of difficult degradation, be convenient to the dehydration of mud, increased considerably the output of voltaile fatty acid, productive rate reaches as high as 0.275g voltaile fatty acid (VFA)/g volatile solid (VS);
3rd, adopt liquefaction fermentation method, shorten sludge fermentation produce acid the cycle of operation, improve production efficiency, in same period, voltaile fatty acid day output average out to sequence batch (fermentation 2 ~ 3 times;
4th, fermented liquid SS content is lower, does not need to carry out sludge press filtration dehydration, is convenient to follow-up relevant treatment and purification of products, reduce the energy consumption of subsequent disposal simultaneously;
5th, in fermenting process, equipment does not need to stir, and operation energy consumption is low, simple to operate, is convenient to routine maintenance.
Particularly, the invention provides the following:
1. method for sludge treatment, said method comprising the steps of: carry out alkaline Pretreatment to mud and be dissolved in liquid phase to make the solid-state carbon source in described mud; And, solid-liquid separation is carried out to the mud after alkaline Pretreatment, obtains supernatant liquor.
2. the method for the 1st, wherein said mud is the mud that solid content reaches 5-20%.
3. the method for the 1st, wherein said mud takes from the second pond of municipal wastewater treatment plant or the excess sludge of settling tank.
4. the method for the 1st, the condition of wherein said alkaline Pretreatment is pH=10 ~ 12, temperature=90 ~ 105 DEG C, treatment time=18 ~ 24 hours.
5. the method for the 1st, wherein said alkaline Pretreatment makes resolvable chemical oxygen demand (SCOD) dissolution rate in the liquid phase of described mud reach more than 70%.
6. the method for the 1st, wherein said solid-liquid separation is undertaken by standing sedimentation.
7. the method for the 1st, the suspended solid (SS) in the supernatant liquor wherein obtained through described solid-liquid separation is lower than 10g/L.
8. utilize mud to produce the method for lipid acid, described method comprises carries out anaerobically fermenting product lipid acid using the supernatant liquor obtained by the method for 1-7 item as substrate in anaerobic reactor.
9. the method for the 8th, wherein said anaerobically fermenting is for continuously fermenting.
10. the method for the 8th, wherein said anaerobic reactor is upflow type anaerobic reactor.
Accompanying drawing illustrates:
Fig. 1: mud solubility rate change before and after liquefaction processing and in different time.
Fig. 2: before and after liquefaction processing and different time sludge dewatering situation change.
Fig. 3: voltaile fatty acid (VFA) the productive rate daily variation that the mud that liquefies after non-pretreating sludge sequence batch fermentation, liquefaction processing mud sequence batch fermentation, liquefaction processing continuously ferments.
Specific implementation method
Further describe the present invention below in conjunction with accompanying drawing and example, but the invention is not restricted to the following drawings and specific embodiment.
The excess sludge being applicable to the inventive method takes from second pond or the settling tank of municipal wastewater treatment plant, and in mud, essential substance is the organism such as protein, polysaccharide and organic acid, accounts for more than 50% of mud total mass.
Be applicable to second pond or anaerobically fermenting pond that anaerobically fermenting kind mud of the present invention can take from Sewage Plant, the source of mud is not particularly limited.The kind mud adding domestication in the anaerobically fermenting of mud belongs to the routine techniques in this area.In addition, the acclimation method of planting mud also belongs to the common technology in this field of sludge anaerobic fermentation and acid production, identical with method described in forefathers.
Embodiment 1
(Wuxi is large puts Sewage Plant to regulate city excess sludge with deionized water, Jiangsu) TS (total solid concentration) to 65g/L, and regulate its pH to be 11 by NaOH solution, sealing, slowly 2h is stirred, afterwards synthermal standing 22h under being placed in 90 ~ 105 DEG C of conditions.In addition, the pH of same concentration mud is adjusted to 11, sealing, slowly stir 2h under being placed in 90 ~ 105 DEG C of conditions, room temperature leaves standstill 22h afterwards.Compared by mud sample by above two kinds of different modes process, mud organic substance solubility rate and sludge dewatering situation compare sees Fig. 1 and Fig. 2.After thermokalite liquefaction processing 2h, cooling leaves standstill, and thermokalite liquefaction processing 24h substrate solubility rate increases 5.5%, and capillary water absorbing time reduces 54%, and viscosity reduces by 95%, and settlement separate supernatant liquor SS is 7.9g/L.
Embodiment 2
Get the city excess sludge that concentration is 65gTS/L, carry out liquefaction processing (pH10 ~ 12,90 ~ 105 DEG C, 18 ~ 24h) and standing separation supernatant liquor after liquefaction, after inoculating the domestication of 20 volume % afterwards, plant mud.Plant the conventional anaerobic granule sludge that mud takes from Wuxi Citric Acid Plant sewage disposal UASB reactor, can use after the manual simulation's waste water being substrate carries out the domestication of 2 weeks by a definite date in the UASB reactor of 5L in order to glucose.Mud after inoculation kind of mud is carried out respectively sequence batch fermentation and continous way fermentation, sequence batch fermentation is disposablely add substrate, and run duration does not enter discharge substrate, and continuously ferments as reactor run duration enters continuously and discharges substrate every day.Meanwhile, the excess sludge getting the same concentration of not carrying out above-mentioned liquefaction processing carries out sequence batch fermentation, in contrast.Between yeast phase, reactor temperature controls at 35 ± 2 DEG C, and pH controls 9 ~ 10, and after non-liquefaction processing mud sequence batch fermentation and liquefaction processing, mud sequence batch fermentation adopts shaker fermentation, and rotating speed is 120rpm.The supernatant liquor be separated after liquefaction processing continuously ferments and adopts useful volume to be the UASB reactor (Shanghai Pu Du company limited) of 5.0L, and organic loading is 10kgCOD/m
3/ d.The VFA that reaction was carried out in 12 days changes as shown in Figure 3.Result shows, and for the liquefaction processing mud carrying out continuously fermenting, VFA productive rate on average can reach 2.78g/L/d, reaches as high as 3.78g/L/d, and compared to other two kinds fermentations, productive rate improves 2.8 times.
Claims (10)
1. method for sludge treatment, said method comprising the steps of: carry out alkaline Pretreatment to mud and be dissolved in liquid phase to make the solid-state carbon source in described mud; And, solid-liquid separation is carried out to the mud after alkaline Pretreatment, obtains supernatant liquor.
2. the process of claim 1 wherein that described mud is the mud that solid content reaches 5-20%.
3. the process of claim 1 wherein that described mud takes from the second pond of municipal wastewater treatment plant or the excess sludge of settling tank.
4. the process of claim 1 wherein that the condition of described alkaline Pretreatment is pH=10 ~ 12, temperature=90 ~ 105 DEG C, treatment time=18 ~ 24 hours.
5. the process of claim 1 wherein that described alkaline Pretreatment makes resolvable chemical oxygen demand (SCOD) dissolution rate in the liquid phase of described mud reach more than 70%.
6. the process of claim 1 wherein that described solid-liquid separation is undertaken by standing sedimentation.
7. the process of claim 1 wherein that suspended solid (SS) in the supernatant liquor that described solid-liquid separation obtains is lower than 10g/L.
8. utilize mud to produce the method for lipid acid, described method comprises carries out anaerobically fermenting product lipid acid using the supernatant liquor obtained by the method for claim 1-7 as substrate in anaerobic reactor.
9. the method for claim 8, wherein said anaerobically fermenting is for continuously fermenting.
10. the method for claim 8, wherein said anaerobic reactor is upflow type anaerobic reactor.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106145579A (en) * | 2016-08-05 | 2016-11-23 | 华东理工大学 | Alkaline residue and excess sludge coupled rotational flow release carbon method and device |
| CN107285583A (en) * | 2017-08-07 | 2017-10-24 | 深圳市海源能源科技有限公司 | A kind of sludge treatment technique based on carbon source reuse |
| CN107881203A (en) * | 2017-10-25 | 2018-04-06 | 江南大学 | A kind of method for promoting excess sludge anaerobic fermentation and acid production |
| CN109231746A (en) * | 2018-08-24 | 2019-01-18 | 湖南大学 | A kind of method that iron electrode activation persulfate pretreating sludge optimization produces sour structure |
| WO2021169130A1 (en) * | 2020-02-25 | 2021-09-02 | 中山大学 | Method for implementing safe treatment of sludge and resource recovery by means of sludge liquefaction layering |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106145579A (en) * | 2016-08-05 | 2016-11-23 | 华东理工大学 | Alkaline residue and excess sludge coupled rotational flow release carbon method and device |
| CN106145579B (en) * | 2016-08-05 | 2020-07-28 | 华东理工大学 | Alkali residue and excess sludge coupling rotational flow carbon release method and device |
| CN107285583A (en) * | 2017-08-07 | 2017-10-24 | 深圳市海源能源科技有限公司 | A kind of sludge treatment technique based on carbon source reuse |
| CN107881203A (en) * | 2017-10-25 | 2018-04-06 | 江南大学 | A kind of method for promoting excess sludge anaerobic fermentation and acid production |
| CN109231746A (en) * | 2018-08-24 | 2019-01-18 | 湖南大学 | A kind of method that iron electrode activation persulfate pretreating sludge optimization produces sour structure |
| WO2021169130A1 (en) * | 2020-02-25 | 2021-09-02 | 中山大学 | Method for implementing safe treatment of sludge and resource recovery by means of sludge liquefaction layering |
| US11459259B2 (en) | 2020-02-25 | 2022-10-04 | Sun Yat-Sen University | Method for realizing sludge safe disposal and resource recovery through sludge liquefaction and stratification |
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