CN102070286B - Method for improving sludge anoxic/aerobic digestion property by utilizing ultrasonic pretreatment - Google Patents
Method for improving sludge anoxic/aerobic digestion property by utilizing ultrasonic pretreatment Download PDFInfo
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- CN102070286B CN102070286B CN2010105624361A CN201010562436A CN102070286B CN 102070286 B CN102070286 B CN 102070286B CN 2010105624361 A CN2010105624361 A CN 2010105624361A CN 201010562436 A CN201010562436 A CN 201010562436A CN 102070286 B CN102070286 B CN 102070286B
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Abstract
The invention discloses a method for improving the sludge anoxic/aerobic digestion property by utilizing ultrasonic pretreatment. The method comprises the following steps of: supplying sludge to a sludge anoxic/aerobic digestion reactor and providing an anoxic/aerobic environment through intermittent aeration, wherein the sludge retention time is 12 days, 24 hours form a period, the aerobic time is 12 hours, the anoxic time is 12 hours, 8.3 percent of digested sludge is discharged every day, and sludge which is equivalent to the discharged sludge and pretreated through ultrasonic waves is input every day. In the invention, low-energy ultrasonic pretreatment and sludge anoxic/aerobic digestion are combined, thus the sludge is cracked to a certain extent, the bioactivity of the sludge is enhanced, and the anoxic/aerobic digestion property of the sludge is improved; compared with a technology singly adopting sludge anoxic and aerobic/anoxic digestion or the traditional ultrasonic-aerobic digestion technology, the method has the advantages of improving the sludge digestion efficiency and shortening the digestion time; and the method also has the advantages of reducing the aeration energy consumption and saving the energy expense.
Description
Technical field
The present invention relates to environment protection and comprehensive utilization of resources field, particularly a kind of method of utilizing ultrasonic pretreatment to improve mud anoxic/aerobic sigestion performance
Background technology
Excess sludge is the final product of biological sewage treatment.It contains heavy metal, pathogenic bacteria, organic pollutant and other objectionable impurities, if do not deal carefully with, possibly cause serious secondary pollution.Along with further the popularizing of sewage treatment facility, the increase of treatment capacity, the raising of handling standard and the expansion of processing capacity, the generation of mud will increase significantly.The processing of mud and disposal will become a great problem of environmental area.At present, the sludge treatment method of disposal has: sanitary landfill, Ocean dumping, sludge incineration, recycling sludge utilization etc.Sanitary landfill, Ocean dumping, sludge incineration all can produce secondary pollution and are restricted environment.
The recycling key of mud is the minimizing of mud, stabilization and innoxious.During the sludge organism minimizing is handled; Big-and-middle-sized sewage work adopts the method for anaerobic digestion to handle mostly; The biogas that produces in its treating processes can be used as secondhand energy and uses, thereby relatively is suitable for producing a large amount of mud and the generate electricity large-scale wastewater treatment plant of use device of methane is set synchronously.And for middle-size and small-size sewage work, it is too high to introduce methane use device cost, and the methane that adopts Anaerobic Digestion mud to produce can not be utilized effectively, and has become secondary pollution on the contrary.Therefore, sludge aerobic digestion is because of it has that initial cost is few, processing efficiency is high, operational management is convenient, working cost is lower, final product odorless and supernatant BOD
5Advantages such as concentration is low and in middle-size and small-size water factory, using more and more widely.Developed countries such as the U.S., Japan, Canada all have many medium and small sewage works to adopt aerobic sigestion to handle mud; Only just there are 20 these methods of small sewage treatment plants operation utilization in certain province of Canada: the mud of Denmark nearly 40% uses aerobic method to carry out stabilization treatment, and visible sludge aerobic digestion process has huge development potentiality.But this method energy consumption is high, and pH constantly descends in digestive process, influences the aerobic sigestion effect.So; The anoxic of mud/aerobic sigestion technology (Anoxic/Aerobic Digestion; A/AD) developed because solving these two problems, will help to improve the situation of a large amount of medium and small sludge of sewage treatment plant difficult treatment to the further research of mud A/AD technology.
The ultrasonic pretreatment technology can improve the biological activity and the degradable performance of mud because of it has advantages such as efficient, stable, safe aspect cytoclasis in the mud pre-treatment.Therefore, utilize the ultrasonic of suitable intensity to cause the concern that People more and more is many in the mud preprocessing technical field in recent years.
To the research of ultrasonication mud, mainly focus on the promotion aspect of UW from abroad, be applied to mud A/AD digestion process to it and do not see relevant report at present as yet anaerobic sludge digestion.
Summary of the invention
The objective of the invention is the sludge disposal problem that exists in the present municipal sewage treatment process for solving; Provide that a kind of processing cost is low, last effect good, digestion period is short, simple to operate, the residual sludge reduction method that is easy to manage, realize minimizing, stabilization and the resource utilization of sewage treatment plant residual mud.
The method of utilizing ultrasonic pretreatment to improve mud anoxic/aerobic sigestion performance of the present invention; The device that uses comprises a mud anoxic/aerobic sigestion reactor drum and a processor for ultrasonic wave at least, and processor for ultrasonic wave comprises a ultra-sonic generator and a ultrasonic response groove again; The top of said mud anoxic/aerobic sigestion reactor drum and ultrasonic response groove is equipped with agitator motor and mud inlet; The below is equipped with mud mouth; Mud anoxic/aerobic sigestion reactor bottom is provided with aerating apparatus, links to each other through conduit and the aerating regulation valve air compressor machine outside with placing reactor drum.
A kind of method of utilizing ultrasonic pretreatment to improve mud anoxic/aerobic sigestion performance of the present invention may further comprise the steps:
(1) at first adopt sludge pump with in mud suction mud anoxic/aerobic sigestion bio-reactor, (120r/min) fully stirs with electric mixer, makes mud be in even suspended state;
(2) with air compressor machine the mud in the mud anoxic/aerobic sigestion bio-reactor in the step (1) is carried out intermittent aeration, through intermittent aeration anoxic/aerobic alternate environment is provided, the residence time of mud is 12 days;
(3) whenever with sludge pump the mud in the anoxic in the step (1)/aerobic sigestion reactor drum was carried out spoil disposal at a distance from 24 hours and advance mud once, the sludge concentration of advancing mud is 9.5～11.5g/L;
(4) advance and carry out ultrasonic pretreatment to all advancing mud before the mud;
(5) with sludge pump with the mud anoxic/aerobic sigestion bio-reactor in the pretreated mud suction step (1) in the step (4);
Aeration mode provides anoxic/aerobic alternate environment through intermittent aeration in the above-mentioned steps (2), and 24 hours is one-period, aerobic 12 hours; Anoxic 12 hours, aerobic during, regulate air input by pipeline aeration switch; DO is controlled at 5.5～6.0mg/L, and temperature of reaction is controlled at about 25 ℃.
In above-mentioned steps (3) and (4) spoil disposal advance the mud amount be in mud anoxic/aerobic sigestion bio-reactor sludge quantity 8.3%.
The pretreated ultrasonic pretreatment parameters combination of sludge through ultrasonic waves is in the above-mentioned steps (4): ultrasonic frequency 28kHz, acoustic density 0.15W/mL, ultrasonic time 10min.
The present invention compared with prior art has following advantage and beneficial effect:
1. the present invention combines low-yield ultrasonic pretreatment first with mud anoxic/aerobic sigestion, not only to a certain degree having cracked mud, has also strengthened the biological activity of mud, thereby has improved mud anoxic/aerobic sigestion performance.Compare with independent employing anoxic/aerobic sigestion, improved sludge digestion efficient, shortened digestion time.
2. because anti-nitration reaction can take place in the anoxic stage in mud; This method will be higher than existing UW-aerobic sigestion technology to the clearance of mud total nitrogen, and is keeping pH and basicity balance and improving that all to be better than UW-aerobic sigestion aspect the dehydration property technological.This method has also reduced aeration energy consumption, has saved energy expenditure, has good economic benefit.
3. system's floor space and volume are little, and construction and working cost are lower, technical maturity, system stability.
Description of drawings
Fig. 1 is the system architecture synoptic diagram of sludge through ultrasonic waves-anoxic of the present invention/aerobic digestion device.
Wherein: 1 is that the master advances dredge pump; 2 advance dredge pump for son; 3 is sludge pump; 4 is the ultrasonic reaction groove; 5 is whisking appliance; 6 is air compressor machine; 7 is aeration head; 8 is mud discharging mouth; 9 is ultrasonic generator.
Fig. 2 is digestion process technological line figure of the present invention.
Embodiment
Embodiment 1:
(take from Guangzhou Li Jiao sewage work, moisture percentage in sewage sludge is 98.3%, and pH is 6.7 with raw sludge; MLSS is 10.5g/L, and MLVSS is 5.6g/L, and COD is 42mg/L in the mud supernatant; Ammonia nitrogen is 13mg/L, and TP is 4mg/L) inject in the reaction tank through advancing dredge pump, open the stirrer (120r/min) in the reaction tank; Through intermittent aeration anoxic/aerobic alternate environment is provided, the residence time of mud is 12 days; 24h is an one-period, aerobic 12h, anoxic 12h, aerobic during, regulate air input by pipeline aeration switch, DO is controlled at 5.5～6.0mg/L.Temperature is controlled at about 25 ℃ during reaction.Every at a distance from 24h the mud in the reactor drum carried out spoil disposal and advances mud once, spoil disposal advance the mud amount be in mud anoxic/aerobic sigestion bio-reactor sludge quantity 8.3%, the concentration of advancing dirt mud is 9.5～10.5g/L.Advance all to be advanced mud before the mud and carry out ultrasonic pretreatment, the UW radiation parameter is combined as: ultrasonic frequency 28kHz, acoustic density 0.15W/mL, ultrasonic time 10min.Behind the digestion reaction 11d, it is stable that sludge digestion reaches.The mud MLSS clearance and the MLVSS clearance of discharging reach 21.9% and 41.0% respectively, and the clearance of TCOD is 60.5%.Continue digestion, the maximum MLSS clearance and the MLVSS clearance of mud reach 35.3% and 55.1%.
Embodiment 2:
(take from Guangzhou Li Jiao sewage work, moisture percentage in sewage sludge is 97.3%, and pH is 7.1 with raw sludge; MLSS is 10.2g/L, and MLVSS is 5.4g/L, and COD is 40mg/L in the mud supernatant; Ammonia nitrogen is 12mg/L; TP is 10mg/L) inject respectively in two reaction tank A and the B through mud inlet, A reaction tank mud only carries out anoxic/aerobic sigestion, and B reaction tank mud carries out UW-anoxic/aerobic sigestion.Other experiment conditions are identical with instance 1.Behind the digestion 11d; The MLSS clearance of B reaction tank mud and MLVSS clearance have improved 10.23% and 13.03% and reach stable respectively than A reaction tank mud; The sludge digestion of A reaction tank just reaches stable after 20 days, so B reaction tank digestion time has shortened 9 days than A reaction tank.
Embodiment 3
(take from Guangzhou Li Jiao sewage work, moisture percentage in sewage sludge is 98.9%, and pH is 6.8 with raw sludge; MLSS is 11.5g/L, and MLVSS is 5.7g/L, and COD is 40.8mg/L in the mud supernatant; Ammonia nitrogen is 6mg/L; TP is 14mg/L) inject respectively in two reaction tank A and the B through mud inlet, A reaction tank mud carries out aerobic sigestion, and the B reaction tank carries out UW-anoxic/aerobic sigestion.Other experiment conditions are identical with instance 1.Behind the digestion 11d, the MLSS clearance of B reaction tank mud and MLVSS clearance and A pond approaching, but the clearance of total nitrogen reaches 38.7% in the B pond, is higher than the A pond, and the concentration of the ammonia nitrogen in the mud supernatant of B pond also will be far below the A pond.In addition, the resistivity of mud is 9.08 * 10 in the B pond
13M/kg, the resistivity of mud is 3.16 * 10 in the A pond
14M/kg explains that the dehydration property of mud after ultrasonic-anoxic/aerobic sigestion is better than the mud of aerobic sigestion.
Claims (5)
1. method of utilizing ultrasonic pretreatment to improve mud anoxic/aerobic sigestion performance is characterized in that may further comprise the steps:
(1) at first adopts sludge pump with in mud suction mud anoxic/aerobic sigestion bio-reactor, fully stir, make mud be in even suspended state with electric mixer;
(2) with air compressor machine the mud in the mud anoxic/aerobic sigestion bio-reactor in the step (1) is carried out intermittent aeration, through intermittent aeration anoxic/aerobic alternate environment is provided, the residence time of mud is 12 days;
(3) whenever with sludge pump the mud in the anoxic in the step (1)/aerobic sigestion reactor drum was carried out spoil disposal at a distance from 24 hours and advance mud once, the sludge concentration of advancing mud is 9.5～11.5g/L;
(4) advance and carry out ultrasonic pretreatment to all advancing mud before the mud;
(5) with sludge pump with the mud anoxic/aerobic sigestion bio-reactor in the pretreated mud suction step (1) in the step (4).
2. method according to claim 1; It is characterized in that: the device that this method is used comprises a mud anoxic/aerobic sigestion reactor drum and a processor for ultrasonic wave at least, and processor for ultrasonic wave comprises a ultra-sonic generator and a ultrasonic response groove again; The top of said mud anoxic/aerobic sigestion reactor drum and ultrasonic response groove is equipped with agitator motor and mud inlet; The below is equipped with mud mouth; Mud anoxic/aerobic sigestion reactor bottom is provided with aerating apparatus, links to each other through conduit and the aerating regulation valve air compressor machine outside with placing reactor drum.
3. method according to claim 1; It is characterized in that: aeration mode provides anoxic/aerobic alternate environment through intermittent aeration in the above-mentioned steps (2), and 24 hours is one-period, aerobic 12 hours; Anoxic 12 hours; During aerobic, regulate air input, DO is controlled at 5.5～6.0mg/L by pipeline aeration switch.
4. method according to claim 1 is characterized in that: in above-mentioned steps (3) and (4) spoil disposal advance the mud amount be in mud anoxic/aerobic sigestion bio-reactor sludge quantity 8.3%.
5. method according to claim 1 is characterized in that: the pretreated ultrasonic pretreatment parameters combination of sludge through ultrasonic waves is in the above-mentioned steps (4): ultrasonic frequency 28kHz, acoustic density 0.15W/mL, ultrasonic time 10min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102351391B (en) * | 2011-09-13 | 2013-06-19 | 大连力达环境工程有限公司 | Dewatered sludge anaerobic digestion pretreatment process and system |
| CN102583928A (en) * | 2012-01-19 | 2012-07-18 | 天津大学 | Method for performing mixed fermentation on low-intensity ultrasonically disintegrated sludge and crop straws and application of method in improving mesophilic anaerobic digestion |
| CN103043876B (en) * | 2012-12-25 | 2013-11-06 | 北京工业大学 | Method for reinforcing sludge digestion and synchronizing nitrogen and phosphorus removal |
| CN103803770B (en) * | 2014-02-26 | 2015-10-07 | 江苏理工学院 | Organic sludge high-temperature micro-aerobic-anaerobic digestion device and method |
| CN104030534B (en) * | 2014-06-30 | 2016-02-03 | 南京信息工程大学 | A kind of active sludge Water warfare reactor and application thereof |
| CN104926065B (en) * | 2015-05-25 | 2017-06-30 | 湛江远通高新技术有限公司 | Separator for mud and water |
| CN105251761A (en) * | 2015-11-10 | 2016-01-20 | 南京信息工程大学 | Ultrasonic degradation instrument and application thereof to aspect of soil organic pollutant degradation |
| CN108503159A (en) * | 2018-04-10 | 2018-09-07 | 中国科学院南京地理与湖泊研究所 | A kind of pre-treating method of water supply plant iron aluminium mud |
| CN111410361A (en) * | 2020-03-16 | 2020-07-14 | 上海世浦泰膜科技有限公司 | Multifunctional sewage treatment device and treatment process thereof |
| CN115784543A (en) * | 2022-11-21 | 2023-03-14 | 辽宁大学 | Sludge reduction device and sludge reduction method based on hydrodynamic cavitation coupled aerobic digestion |
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| CN101244882A (en) * | 2008-03-25 | 2008-08-20 | 哈尔滨工业大学 | Method for reducing sewage sludge in biological sewage treatment process by using ultrasound wave |
| WO2010122500A2 (en) * | 2009-04-21 | 2010-10-28 | Universita' Degli Studi Di Trento | Method for depuration of wastewaters with reduction of sludge production and plant thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101244882A (en) * | 2008-03-25 | 2008-08-20 | 哈尔滨工业大学 | Method for reducing sewage sludge in biological sewage treatment process by using ultrasound wave |
| WO2010122500A2 (en) * | 2009-04-21 | 2010-10-28 | Universita' Degli Studi Di Trento | Method for depuration of wastewaters with reduction of sludge production and plant thereof |
Non-Patent Citations (1)
| Title |
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| 林楚娟.超声波强化剩余污泥缺氧/好氧消化的研究.《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》.2008,(第8期),38-39、42-43. * |
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