CN105174676B - Electric Fenton source sludge reduction method and system based on electrochemistry sludge pretreatment - Google Patents
Electric Fenton source sludge reduction method and system based on electrochemistry sludge pretreatment Download PDFInfo
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Abstract
A kind of electric Fenton source sludge reduction method and system based on electrochemistry sludge pretreatment, belong to Disposal Technology of Residual Sludge field.The condition and feature of the invention for fully combining electroplating sludge reaction and the electric Fenton oxidation of sludge, its system includes sewage plant aeration tank, sewage plant second pond, the main reaction pond circulatory system and the sludge circulation pump I for circulating connection successively, and the sewage plant second pond connects sewage plant aeration tank by sludge reflux pipeline；The electric Fenton Treatment of Sludge main reactor system includes electric Fenton main reactor, sludge circulation pump II and sludge storage tank, and electric Fenton main reactor end connects sewage plant second pond, sludge storage tank end connection sludge circulation pump I.Sludge after present invention processing, original microbial cell structure is totally disrupted, is conducive to further being recycled back to aeration tank aerobic sigestion.Crack gained using carbon source by the further catabolism of microorganism so that at source reduce sewage plant excess sludge discharge, realize the sludge reduction onsite of sludge.
Description
Technical field
The invention belongs to Solid Waste Treatment technical field, and in particular to a kind of electricity consumption chemical sludge pretreatment and electric Fenton
The mode being combined realizes that sludge deep is cracked, the pH adjusted entrance sewage plant aeration tank of the sludge after cracking, so as to realize dirt
The sludge reduction onsite of water factory's excess sludge.
Background technology
Excess sludge is a kind of inevitable accessory substance of municipal sewage plant's Wastewater Treated by Activated Sludge Process waste water, such material tool
There is moisture content high and water degree of adhesion is big, dewatering is poor, poisonous and harmful class substance classes complicated, solid reclaims difficult, follow-up locate
It is set to the features such as this is high.Therefore, sludge yield how is reduced from source, it is mesh to explore new mud decrement sludge reduction onsite technology
The hot issue of preceding sewage treatment industry research.
Current sludge in-situ decrement is mainly by terms of three below：One is the Sludge Reduction Technologies based on recessive growth；
Two be the Sludge Reduction Technologies grown based on uncoupling；Three be the Sludge Reduction Technologies based on microorganism predation.Wherein uncoupling is given birth to
The uncoupler thrown outside growth process easily causes secondary environmental pollution, and microorganism predation is although environment-friendly and cost is relatively low, still
The more difficult control of the value volume and range of product of microfauna in system.Therefore it is mesh that the lysis effect based on recessive growth, which carries out mud decrement,
The major control means of preceding Sludge Reduction Technologies.Conventional lysis technology includes heating, acid adding plus alkali, ultrasonic wave, ozone, two
Aoxidize oxychloride, addition enzyme preparation etc..But exist in the above method application process medicament it is costly/energy consumption is big/accessory substance poisons
The problems such as acting on strong.
Therefore, the problem of current sludge in-situ decrement is that medicine consumption cost is high and system energy consumption is big, system regulation complex process,
The later use of sludge is influenceed, environmental benefit is poor.
The content of the invention
For above-mentioned technical problem, present invention aims at provide a kind of preelectrolysis-electricity Fenton to promote sludge former
The method of position decrement, by being electrolysed in advance and electric Fenton oxidation Combined Treatment excess sludge, one side destruction sludge flocculation structure
With internal microbial body eucaryotic cell structure, the release of intracellular water is promoted sludge dewatering decrement, on the other hand promote macromolecular in sludge
Organic matter resolves into small-molecule substance, and pH adjusted pond, which is nursed one's health to suitable pH, returns to aeration tank in sewage plant, as available
Carbon source reaches sludge in-situ reduced training by the further catabolism of microorganism, fundamentally solves what excess sludge was brought
A series of environmental problems.
The present invention is achieved through the following technical solutions：
A kind of electric Fenton source sludge reduction method based on electrochemistry sludge pretreatment of the present invention, including following step
Suddenly：
(1) excess sludge electrolysis pretreatment：After solid content 3%-5% excess sludge enters reactor, pre- electricity is carried out
Solution reaction, when pH value, temperature conditionss reach electric Fenton processing requirement, that is, starts next step；
(2) the electric Fenton oxidation processing of sludge：Sludge pH Jing Guo electrolysis pretreatment, temperature conditionss are reached at electric Fenton
After reason is required, the aerator that reactor bottom closes on negative electrode starts aeration, and iron powder is put into reactor,；
(3) sludge pH is adjusted：Sludge after being handled to electric Fenton oxidation adds the Ca (OH) of concentration 5%2Solution is adjusted
The pH value of sludge is to 6-7, Ca (OH)2Dosage be 0.02-0.05g/g mud dry weights；
(4) sludge aeration pond digestion process：The sludge adjusted by pH is returned to through pump circulation in the aeration tank of sewage plant, is made
Absorbed for nutriment by activated sludge.
Further, excess sludge electrolysis pretreatment in described (1) step：Voltage gradient 2-6V/cm, pretreatment time is
20-30min。
Further, the pH of sludge electricity Fenton oxidation processing is controlled in 2-4 in described (2) step, is put into reactor
Iron powder is 0.005-0.008 with mud dry weight ratio.
Further, Ca (OH) in described (3) step2Dosage ratio with mud dry weight is 0.02-0.05.
Further, including be sequentially communicated sewage plant aeration tank, sewage plant second pond, electric Fenton Treatment of Sludge main reaction
Device system, sludge circulation pump I and pH regulating reservoirs, the sewage plant second pond connect sewage plant by sludge reflux pipeline and are aerated
Pond；The electric Fenton Treatment of Sludge main reactor system includes main reactor, sludge circulation pump II and the dirt that circulation is sequentially connected
Mud storage tank, main reactor end connection sewage plant second pond, sludge storage tank end connection sludge circulation pump I.
Further, the main reactor is to set multiple fixed in barrel mast formula electrolyser construction, barrel mast formula electrolytic cell
Aerator, is evenly distributed in electrolytic cell, and its outer barrel is NACF negative electrode, and inside is set in column DSA anodes, outer barrel
Detection pH, throughput, flow quantity, the sensor of temperature are additionally provided with wall, outer barrel top sets iron powder supply device.
Compared with prior art, the invention has the advantages that and effect：
1. preelectrolysis-electricity Fenton oxidation integrated processes of the present invention, fully combine electroplating sludge reaction and the electric Fenton of sludge
The condition and feature of oxidation, by additional iron powder, make H2O2Produced in cathodic reduction, without outer throwing H2O2, reagent cost is saved,
Both electrochemical reaction and Fenton's reaction are mutually promoted, and greatly improve treatment effeciency.At preelectrolysis-electricity Fenton oxidation joint
Sludge after reason, MLSS clearances are greatly reduced up to 65% or so by electrochemical oxidation process internal solids material, are constituted
The organic substance of flco is oxidized to the solvable small molecule being easily decomposed by the microorganisms, and original microbial cell structure is complete
Destruction, is conducive to further being recycled back to aeration tank aerobic sigestion.The supernatant for cracking gained can rich in a large amount of SCOD, nitrogen P elements
For the nutrient solution of denitrification dephosphorization technique, absorbed as nutriment by activated sludge, so as to reduce sewage plant at source
The discharge of excess sludge, realizes the sludge reduction onsite of sludge.
2. barrel mast formula electrolyser construction is set in main reactor of the present invention, with higher utilization rate of electrical.DSA materials
Column anode and NACF negative electrode material can significantly lift reaction efficiency.In electric Fenton oxidation stage, cathode anode
Breaking sludge is acted on simultaneously, and the iron powder of input is removed participates in reaction as catalyst, is also used as three-diemsnional electrode and promotes electroxidation
Effect.Other main reaction pond, sludge storage tank, sludge circulation pump can constitute sludge circulation reaction system again, pass through the continuous of sludge
Circulation, both beneficial to practical operation, lifts the treatment effect of sludge again.
3. the electric Fenton source mud decrement system for the electrochemistry sludge pretreatment that the present invention is built, technological process is brief,
Simple to operate, it is easy to control, investment cost is low.And combined closely with traditional sludge handling process, it is easy to carry out sewage disposal
The transformation of factory, a new approaches are provided for China's specific resistance to filtration.
Brief description of the drawings
Fig. 1 is system structure diagram of the invention.
Fig. 2 is the main reactor structural representation in Fig. 1.
In figure:1- aeration tanks, 2- second ponds, 31- sludge circulation pumps I, 32- sludge circulation pumps II, 4-pH regulating reservoirs, 5- master
Reactor, 6- sludge storage tanks, 7- iron powder supply devices, 8- negative electrodes, 9- sensors, 10- anodes, 11- aerators.
Embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
Embodiment 1：A kind of electric Fenton source sludge reduction method based on electrochemistry sludge pretreatment of the present invention, including
Following steps：
(1) excess sludge electrolysis pretreatment：After solid content 3%-5% excess sludge enters reactor, pre- electricity is carried out
Solution reaction, when pH value, temperature conditionss reach electric Fenton processing requirement, that is, starts next step；
(2) the electric Fenton oxidation processing of sludge：Sludge pH Jing Guo electrolysis pretreatment, temperature conditionss are reached at electric Fenton
After reason is required, the aerator that reactor bottom closes on negative electrode starts aeration, and iron powder is put into reactor；
(3) sludge pH is adjusted：Sludge after being handled to electric Fenton oxidation adds the Ca (OH) of concentration 5%2Solution is adjusted
The pH value of sludge is to 6-7, Ca (OH)2Dosage be 0.02-0.05g/g mud dry weights；
(4) sludge aeration pond digestion process：The sludge adjusted by pH is returned to through pump circulation in the aeration tank of sewage plant, is made
Absorbed for nutriment by activated sludge.
Excess sludge electrolysis pretreatment in described (1) step：Voltage gradient 2-6V/cm, pretreatment time is 20-30min.
The pH of sludge electricity Fenton oxidation processing is controlled in 2-4, the iron powder and sludge put into reactor in (2) step
Dry weight ratio is 0.005-0.008.
Ca (OH) in (3) step2Dosage ratio with mud dry weight is 0.02-0.05.
As shown in Figure 1 and Figure 2, the electric Fenton source sludge reduction system based on electrochemistry sludge pretreatment in this example, bag
Include the sewage plant aeration tank being sequentially communicated, sewage plant second pond, electric Fenton Treatment of Sludge main reactor system, sludge circulation pump I
With pH regulating reservoirs, the sewage plant second pond connects sewage plant aeration tank by sludge reflux pipeline；At the electric Fenton sludge
Reason main reactor system includes main reactor, sludge circulation pump II and sludge storage tank that circulation is sequentially connected, and main reactor end connects
Connect sewage plant second pond, sludge storage tank end connection sludge circulation pump I.
The main reactor is that multiple fixed aerators are set in barrel mast formula electrolyser construction, barrel mast formula electrolytic cell,
It is evenly distributed in electrolytic cell, its outer barrel is NACF negative electrode, and inside sets and also set on column DSA anodes, outer tube inner wall
Detection pH, throughput, flow quantity, the sensor of temperature are equipped with, outer barrel top sets iron powder supply device.
The present invention the course of work be：The excess sludge of secondary sedimentation tank of sewage treatment work is acted on by sludge circulation pump 3 to be entered
In main reaction pond 5, simultaneity factor is passed through at direct current, the electrolysis that column DSA anodes 10, tubular NACF negative electrode 8 are constituted
Reason system carries out electroxidation processing to sludge.Sensor 9 is monitored to pH value in system and temperature, reaches electro-Fenton reaction bar
After part, the bottom aerator 11 of main reaction pond 5 starts aeration, and the top iron powder throwing device 7 of main reaction pond 5 adds iron powder, starts
Electric Fenton oxidation reaction.Gas flow sensor 9 is monitored to gas flow in system, with the journey reacted electric Fenton oxidation
Degree is adjusted.Sludge is reacted due to the presence of sludge circulation pump 3 and sludge storage tank 6, can repeatedly be recycled into main reaction pond 5
Reacted.Reach that the sludge of processing requirement enters pH regulating reservoirs regulation pH to 6-7 by sludge circulation pump 3, subsequently into dirt
Water factory aeration tank 1 is consumed as nutriment, realizes the sludge reduction onsite of sludge.
As illustrated in fig. 1 and 2, by taking certain sludge of sewage treatment plant mixed liquor as an example, its mixed liquor sludge concentration MLSS=
7800mg/L, takes 20L mixed liquors to put into sludge storage tank 6, starts sludge circulation pump 3 and sludge is delivered into main reactor 5, be passed through
Direct current, voltage gradient 4-6V/cm.The electrolysis system that column DSA anodes 10, tubular NACF negative electrode 8 are constituted is right first
Sludge carries out electrocatalytic oxidation processing, is handled by 20min electrolysis, and sludge pH drops to 3.0 by initial 7.3, and temperature is by 15
DEG C appreciate 45 DEG C, reached to electric Fenton oxidation condition.It is passed through by the bottom aerator 11 of main reactor 5 to main reactor 5
Air, aeration quantity is 0.02L air/gDS.The input iron powder of top iron powder throwing device 5 of main reaction pond 5, iron powder throwing amount, which compares, is
0.005g/gDS or so.Sludge does not stop to enter in main reactor 5 by recycle unit carries out electric Fenton oxidation reaction.React 30-
After 60min, the sludge MLSS inside main reaction pond 1 is down to 2050mg/L, and sludge is after centrifugation or filter-press dehydration in gained liquid
COD, TP, TN content are substantially increased.Mud discharging after pH regulations processing enters the biochemical reaction tank of certain water factory, is not apparent from
Microorganism character stabilization in the effluent quality of the biochemistry pool, pond is influenceed, the sludge reduction onsite of sludge is realized.
Embodiment 2：This example is as different from Example 1：Electric Fenton source sludge based on electrochemistry sludge pretreatment subtracts
Excess sludge electrolysis pretreatment in described (1) step in quantization method：Voltage gradient 6V/cm, pretreatment time is 30min.
The pH controls of sludge electricity Fenton oxidation processing are 3 in (2) step, and the iron powder put into reactor is done with sludge
Again than for 0.005.
(3) the step sludge pH adjustment：Sludge after being handled to electric Fenton oxidation adds the Ca (OH) of concentration 5%2It is molten
The pH value of liquid conditioning of mud is to 7, Ca (OH)2Dosage ratio with mud dry weight is 0.05.
Embodiment 3：This example is as different from Example 1：Electric Fenton source sludge based on electrochemistry sludge pretreatment subtracts
Excess sludge electrolysis pretreatment in described (1) step in quantization method：Voltage gradient 2V/cm, pretreatment time is 20min.
The pH controls of sludge electricity Fenton oxidation processing are 2 in (2) step, and the iron powder put into reactor is done with sludge
Again than for 0.005.
(3) the step sludge pH adjustment：Sludge after being handled to electric Fenton oxidation adds the Ca (OH) of concentration 5%2It is molten
The pH value of liquid conditioning of mud is to 7, Ca (OH)2Dosage ratio with mud dry weight is 0.03.
Embodiment 4：This example is as different from Example 1：Electric Fenton source sludge based on electrochemistry sludge pretreatment subtracts
Excess sludge electrolysis pretreatment in described (1) step in quantization method：Voltage gradient 4V/cm, pretreatment time is 25min.
The pH controls of sludge electricity Fenton oxidation processing are 3 in (2) step, and the iron powder put into reactor is done with sludge
Again than for 0.006.
(3) the step sludge pH adjustment：Sludge after being handled to electric Fenton oxidation adds the Ca (OH) of concentration 5%2It is molten
The pH value of liquid conditioning of mud is to 7, Ca (OH)2Dosage ratio with mud dry weight is 0.04.
Claims (4)
1. a kind of electric Fenton source sludge reduction method based on electrochemistry sludge pretreatment, it is characterized in that, including following step
Suddenly：
(1) excess sludge electrolysis pretreatment：After solid content 3%-5% excess sludge enters reactor, preelectrolysis is carried out anti-
Should, when pH value, temperature conditionss reach electric Fenton processing requirement, that is, start next step；
(2) the electric Fenton oxidation processing of sludge：Sludge pH Jing Guo electrolysis pretreatment, temperature conditionss are reached into electric Fenton processing
It is required that after, the pH value of sludge electricity Fenton oxidation processing is controlled in 2-4, and the aerator that reactor bottom closes on negative electrode starts to expose
Gas, iron powder is put into reactor, iron powder and the mud dry weight ratio of input are 0.005-0.008；
(3) sludge pH is adjusted：Sludge after being handled to electric Fenton oxidation adds the Ca (OH) of concentration 5%2Solution conditioning of mud
PH value is to 6-7, Ca (OH)2Dosage ratio with mud dry weight is 0.02-0.05；
(4) sludge aeration pond digestion process：The sludge adjusted by pH is returned to through pump circulation in the aeration tank of sewage plant, as
Nutriment is absorbed by activated sludge.
2. the electric Fenton source sludge reduction method as claimed in claim 1 based on electrochemistry sludge pretreatment, its feature exists
In：Described（1）Excess sludge electrolysis pretreatment in step：Voltage gradient 2-6 V/cm, pretreatment time is 20-30min.
3. a kind of be applied to the electric Fenton source sludge reduction method as claimed in claim 1 based on electrochemistry sludge pretreatment
System, it is characterised in that：It is anti-including the sewage plant aeration tank being sequentially communicated, sewage plant second pond, electric Fenton Treatment of Sludge master
Device system, sludge circulation pump I and pH regulating reservoirs are answered, the sewage plant second pond connects sewage plant by sludge reflux pipeline and is aerated
Pond；The electric Fenton Treatment of Sludge main reactor system includes main reactor, sludge circulation pump II and the dirt that circulation is sequentially connected
Mud storage tank, main reactor end connection sewage plant second pond, sludge storage tank end connection sludge circulation pump I.
4. system as claimed in claim 3, it is characterised in that：The main reactor is barrel mast formula electrolyser construction, barrel mast formula
Multiple fixed aerators are set in electrolytic cell, are evenly distributed in electrolytic cell, its outer barrel is NACF negative electrode, internal
Set and detection pH, throughput, flow quantity, the sensor of temperature, outer barrel top are additionally provided with column DSA anodes, outer tube inner wall
Iron powder supply device is set.
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| CN105731728B (en) * | 2016-02-29 | 2018-10-23 | 上海大学 | Improve the method and process unit of activated sludge settling property |
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| CN111333295A (en) * | 2020-02-19 | 2020-06-26 | 西安理工大学 | Electrochemical process method for promoting deep dehydration of sludge |
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| CN112624498A (en) * | 2020-12-02 | 2021-04-09 | 香港科技大学深圳研究院 | Sludge reduction promotion method based on electrochemical pretreatment |
| CN113845278B (en) * | 2021-09-17 | 2023-03-10 | 湖南凯迪工程科技有限公司 | electro-Fenton repair device and method for quickly removing organic matters of polluted bottom mud of rivers and lakes and improving dehydration rate |
| CN115417566B (en) * | 2022-08-30 | 2024-04-12 | 湖南凯迪工程科技有限公司 | electro-Fenton method for converting phosphorus morphology in river and lake polluted bottom mud |
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