CN101219843B - Process for producing carbon source for processing wastewater - Google Patents

Process for producing carbon source for processing wastewater Download PDF

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Publication number
CN101219843B
CN101219843B CN2008100544861A CN200810054486A CN101219843B CN 101219843 B CN101219843 B CN 101219843B CN 2008100544861 A CN2008100544861 A CN 2008100544861A CN 200810054486 A CN200810054486 A CN 200810054486A CN 101219843 B CN101219843 B CN 101219843B
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acid
acid fermentation
fermentation reactor
carbon source
reactor
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CN101219843A (en
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李亚新
宋秀兰
端允
苏冰琴
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Treatment Of Sludge (AREA)

Abstract

The invention relates to a preparation method of carbon resource for treating wastewater, which belongs to the technical fields of environmental protection, the wastewater and sludge treatment.The invention is characterized in that the acidic fermentation preparation process is used for treating the carbon source of mine wastewater with sulfate and hydrochloric acid, which makes the sludge acidic fermentation products contain 42 percent-85 percent of propionic acid, 5 percent-18 percent of acetic acid and 10 percent-40 percent of butyrate, so the short chain fatty acid is unnecessary to be extracted from supernatant of acidic fermentation reactor; the supernatant of the acidic fermentation reactor is used as the carbon source of sulfate reducing bacteria and directly added into the mine wastewater with the sulfate and the hydrochloric acid and the obtained; the invention solves the key difficult problem that a biological method is used for treating the acidic mine wastewater. The sludge acidic fermentation process has simple operation and the fermentation products, propionic acid, acetic acid and butyrate, can be used as low cost carbon sources for treating acidic mine wastewater biologically; at the same time, the process achieves the quantity reduction, resource utilization and stabilization of the sludge.

Description

A kind of preparation method who handles the carbon source of waste water
One, technical field
A kind of preparation method who handles the carbon source of waste water of the present invention belongs to environment protection and waste water, technical field of sludge treatment.Specifically, be the technical scheme that adopts the carbon source of the acid mine wastewater of acid fermentation prepared biological treatment sulfur acid salt.
Two, background technology
Sulfuration be the mine in recovery process, contained sulfide is oxidized to sulfuric acid and produces a large amount of acidic mine waste waters that contains high concentration sulfate.Waste water contains the SO of high density 4 2-, but organic content is low, contains Cu in addition 2+, Mn 2+And Fe 2+Etc. heavy metal ion.Handle this class waste water at present and mainly adopt neutralization, chemical precipitation and electroosmose process, but these methods are very uneconomical, also can produce secondary pollution.The wetland method also can be used to same for treating acidic mine wastewater, but wetland method floor space is big, and degree of treatment is affected by environment very big, and remaining hydrogen sulfide overflow from soil can atmosphere pollution.The biological process same for treating acidic mine wastewater is according to nature sulphur cycle principle, under anaerobic utilizes sulphate reducing bacteria to make SO in the waste water 4 2-Be reduced to H 2S or S 2-, SO 4 2-Be reduced to H 2S or S 2-Process in can discharge basicity, the pH value is improved, again with biological process or chemical process with reduzate H 2S or S 2-Be oxidized to elemental sulfur.Biological process same for treating acidic mine wastewater treatment effect is good, non-secondary pollution, and can reclaim elemental sulfur.But the crucial difficult problem that biological process is handled this class waste water is to select the carbon source of technical feasibility, economical rationality.Different carbon source materials, sulphate reducing bacteria reduction SO 4 2-Speed also inequality, SO when sulphate reducing bacteria utilizes propionic salt, butyrates, acetate 4 2-Rate of reduction reduce successively.Sludge of sewage treatment plant acid fermentation product mainly is the short chain volatile lipid acid that comprises acetate, propionic acid, butyric acid etc.The directed acid fermentation of sludge of sewage treatment plant obtains the short chain volatile lipid acid of easy utilization of sulphate reducing bacteria, has great importance to improving the cost that biological process handles the efficient of this class waste water and reduce biological treatment of mine acidic wastewater.
Three, summary of the invention
A kind of preparation method who handles the carbon source of waste water of the present invention, purpose is in order to utilize the carbon source material in the sludge of sewage treatment plant to greatest extent and to make the sulfate reduction device that maximum reducing power be arranged, improve the ratio of the short chain volatile lipid acid that sulphate reducing bacteria utilizes easily in the sludge of sewage treatment plant acid fermentation product, solve the crucial difficult problem of biological process same for treating acidic mine wastewater, effectively reduce the cost of biological treatment of mine acidic wastewater, disclose a kind of technical scheme that adopts the acid fermentation prepared to handle the carbon source of the acid mine wastewater of sulfur acid salt.
A kind of preparation method who handles the carbon source of waste water, it is characterized in that it being to adopt the acid fermentation prepared to handle the technology of the carbon source of the acid mine wastewater of sulfur acid salt, this acid fermentation technology utilizes the acid fermentation treatment plant's mud of disposing of sewage to prepare carbon source exactly, the mud acid fermentation product of sludge of sewage treatment plant gained behind acid fermentation, it is the propionic acid content 42～85% in the supernatant liquor of acid fermentation reactor, acetic acid content 5～18%, butyric acid content 10～40%, supernatant liquor with the acid fermentation reactor is added to direct carbon source as sulphate reducing bacteria in the acid mine wastewater of sulfur acid salt, and its concrete processing step and condition are:
I. mud acid fermentation technology is carried out in the acid fermentation reactor;
II. inoculation aerobic activated sludge or direct inoculation acid fermentation reactor mud in the acid fermentation reactor start the acid fermentation reactor;
III. the acid fermentation reactor is a sequence batch (acid fermentation reactor, the basic technology parameter of sequence batch (acid fermentation reactor is: hydraulic detention time 3～6.6d, sequence batch (acid fermentation reactor adopts mechanical stirring, stirring velocity 60-180r/min, alr mode is intermittently to stir, per pitch time 40～60min, churning time 5-10min;
IV. sludge of sewage treatment plant is as the acid fermentation reactor feed, and the volatile solid concentration of charging represents that with VS VS is 18～22g/L;
V. suppress the growth of methanobacteria in the acid fermentation reactor, biochemical reaction is 5.5～6.5 in the pH in acid fermentation stage value in the acid fermentation reactor, and solid retention time is 3～10d;
VI. the dominant microflora in the acid fermentation reactor is the propionic acid flora, and the optimal temperature of propionic acid flora is about 37 ℃, and acid fermentation reactor controlled temperature is 26 ℃～38 ℃;
VII. the propionic acid flora is a facultative anaerobic bacteria, redox potential-140～-20mv, add FeCl 3Realize redox potential, its FeCl 3Dosage 160～320mg/L, with Fe 3+Meter, FeCl 3Dosage and controlled temperature be inversely proportional to, along with the rising of temperature, FeCl 3Dosage reduce; FeCl 3Add and promote to form propionic acid;
The supernatant liquor of the sequence batch (acid fermentation reactor that the combination of VIII. above-mentioned condition produces down directly is added in the acid mine wastewater of sulfur acid salt as the carbon source of sulphate reducing bacteria, and dosage is with mixed COD and SO 4 2-Ratio control, its span of control is 0.9～1.5.
Above-mentioned a kind of preparation method who handles the carbon source of waste water, it is characterized in that described acid fermentation reactor adopts when mixing reactor fully, behind mixed fully reactor, add a settling tank, the hydraulic detention time of settling tank is 3h, the supernatant liquor of settling tank directly is added in the acid mine wastewater of sulfur acid salt as the carbon source of sulphate reducing bacteria, and dosage is with mixed COD and SO 4 2-Ratio control, its span of control is 0.9～1.5.
A kind of sludge of sewage treatment plant acid fermentation of the present invention prepares the advantage and the purposes of the technology of sulphate reducing bacteria carbon source:
1) the acid fermentation reactor is simple to operate, and initial cost is low, can be at normal temperatures with lower temperature under operate, do not need heating.Can limit the growth of acetic acid and methane producing bacterium, improve the generation of volatile acid as far as possible.
2) in order to maximally utilise the carbon source material in the sludge of sewage treatment plant, carry out the directed acid fermentation of sludge of sewage treatment plant, improve in the tunning sulphate reducing bacteria ratio of the short chain fatty acid propionic acid of easy utilization as far as possible, make propionic acid content maximization in the mud acid fermentation product, this is favourable to the efficient that improves biological treatment of mine acidic wastewater.
3) acidic mine waste water SO 4 2-The concentration height, organic content is low, and the key of biological treatment of mine acidic wastewater is to select technical feasibility, the carbon source material of economical rationality.Sludge of sewage treatment plant is the solid waste of sewage work, the technological operation of mud acid fermentation is simple, its tunning acetate, propionic acid, butyric acid can be used as the carbon source of the cheapness of biological treatment of mine acidic wastewater, also make sludge reduction, resource utilization, stabilization simultaneously.
4) adopt the sequence batch (acidogenic reactor to handle high-concentration suspension solid mud, the hydraulic detention time and the biosolids residence time are separated, can keep the higher biosolids residence time, the acid production rate height.
5) sludge from wastewater treatment plant enormous amount increases rapidly, is the solid waste that needs to be resolved hurrily.Therefore, sludge from wastewater treatment plant is carried out acid fermentation handle, its tunning can be used as sulphate reducing bacteria reduction SO 4 2-The economical rationality carbon source, both made the process economics of biological process same for treating acidic mine wastewater feasible, make sludge of sewage treatment plant minimizing, resource utilization and innoxious again.
Four, embodiment
Embodiment 1: adopt the sequence batch (acidogenic reactor, use semicontinuous operation scheme, promptly hydraulic detention time equals the biosolids residence time, and hydraulic detention time is represented with HRT, the mean residence time of fingering material in reactor, the biosolids residence time is represented with SRT, refers to the mean residence time of microorganism in this reactor in the reactor, instantaneous water inlet, instantaneous water outlet, adopt mechanical stirring, stirring velocity is 60r/min, and alr mode is intermittently to stir, per pitch time 60min, churning time 10min, 37 ℃ of acidogenic fermentation temperature, pH5.5, charging VS=22g/L, HRT=3d, redox potential is-130mv not add FeCl 3Adopt semicontinuous operation scheme, row will stir before the mixed solution, discharge be muddy water mixed solution, add a settling tank after this operation scheme, carry out mud-water separation, its sedimentation time t=3h.
Embodiment 2: stirring velocity is 180r/min, per pitch time 40min, churning time 5min, pH6.0, charging VS=20g/L, HRT=4.4d, redox potential is-110mv that other is with embodiment 1.
Embodiment 3: 38 ℃ of acidogenic fermentation temperature, stirring velocity are 120r/min, per pitch time 50min, churning time 7min, pH6.5, charging VS=18g/L, HRT=3d, redox potential is-120mv that other is with embodiment 1.
Embodiment 4: 26 ℃ of acidogenic fermentation temperature, stirring velocity are 180r/min, per pitch time 60min, churning time 7min, pH5.5, charging VS=20g/L, HRT=6.6d, FeCl 3Dosage, with Fe 3+Meter, 320mg/L, redox potential-20mv.Other is with embodiment 1.
Embodiment 5: stirring velocity is 120r/min, per pitch time 50min, churning time 10min, pH6.0, charging VS=22g/L, HRT=4.4d, redox potential-50mv.Other is with embodiment 4.
Embodiment 6: 32 ℃ of acidogenic fermentation temperature, stirring velocity are 120r/min, per pitch time 40min, churning time 5min, pH5.5, charging VS=18g/L, HRT=6.6d, FeCl 3Dosage, with Fe 3+Meter, 160mg/L, redox potential-60mv.Other is with embodiment 1.
Embodiment 7: stirring velocity is 180r/min, per pitch time 50min, churning time 7min, pH6.5, charging VS=20g/L, HRT=4.4d, redox potential-80mv.Other is with embodiment 6.
Embodiment 8: adopt the sequence batch (acidogenic reactor, SRT is not equal to HRT, cycle of operation t=24h, flooding time 0.5h, reaction times is 21h, and sedimentation time 2h, water discharge time are 0.5h, adopts mechanical stirring, stirring velocity is 120r/min, and alr mode is intermittently to stir, per pitch time 40min, churning time 5min, 37 ℃ of temperature, pH5.5, charging VS=18g/L, HRT=3d, mud of two days rows, SRT is 1.5 times of HRT, and redox potential-140mv does not add FeCl 3
Embodiment 9: 38 ℃ of temperature, stirring velocity are 60r/min, per pitch time 60min, churning time 10min, pH6.0, charging VS=20g/L, HRT=4.4d, redox potential-120mv.Other is with embodiment 8.
Embodiment 10: 26 ℃ of temperature, stirring velocity are 120r/min, per pitch time 40min, churning time 5min, pH6.5, charging VS=22g/L, HRT=6.6d, FeCl 3Dosage, with Fe 3+Meter is 320mg/L, redox potential-50mv, and other is with embodiment 8.
Embodiment 11: stirring velocity is 180r/min, per pitch time 60min, churning time 7min, pH6.0, charging VS=20g/L, HRT=4.4d, redox potential-70mv, other is with embodiment 8.
Embodiment 12: 32 ℃ of temperature, stirring velocity are 120r/min, per pitch time 50min, churning time 5min, pH5.5, charging VS=18g/L, HRT=6.6d, FeCl 3Dosage, with Fe 3+Meter is 160mg/L, redox potential-80mv, and other is with embodiment 8.
Embodiment 13: stirring velocity is 180r/min, per pitch time 60min, churning time 10min, pH6.0, charging VS=20g/L, HRT=4.4d, FeCl 3Dosage, with Fe 3+Meter is 160mg/L, redox potential-100mv, and other is with embodiment 8.
Embodiment 14: adopt mixed fully reactor, 32 ℃ of temperature stir and are that continuously stirring, stirring velocity are 60r/min, pH6.0, charging VS=18g/L, HRT=SRT=3d, FeCl 3Dosage, with Fe 3+Meter is 240mg/L, and redox potential-90mv adds a settling tank behind mixed fully reactor, and the hydraulic detention time of settling tank is 3h.

Claims (1)

1. preparation method who handles the carbon source of waste water, it is characterized in that it being to adopt the acid fermentation prepared to handle the technology of the carbon source of the acid mine wastewater of sulfur acid salt, this acid fermentation technology utilizes the acid fermentation treatment plant's mud of disposing of sewage to prepare carbon source exactly, the mud acid fermentation product of sludge of sewage treatment plant gained behind acid fermentation, it is the propionic acid content 42～85% in the supernatant liquor of acid fermentation reactor, acetic acid content 5～18%, butyric acid content 10～40%, supernatant liquor with the acid fermentation reactor is added to direct carbon source as sulphate reducing bacteria in the acid mine wastewater of sulfur acid salt, and its concrete processing step and condition are:
I. mud acid fermentation technology is carried out in the acid fermentation reactor;
II. inoculation aerobic activated sludge or direct inoculation acid fermentation reactor mud in the acid fermentation reactor start the acid fermentation reactor;
III. the acid fermentation reactor is a sequence batch (acid fermentation reactor, the basic technology parameter of sequence batch (acid fermentation reactor is: hydraulic detention time 3～6.6d, sequence batch (acid fermentation reactor adopts mechanical stirring, stirring velocity 60-180r/min, alr mode is intermittently to stir, per pitch time 40～60min, churning time 5-10min;
IV. sludge of sewage treatment plant is as the acid fermentation reactor feed, and the volatile solid concentration of charging represents that with VS VS is 18～22g/L;
V. suppress the growth of methanobacteria in the acid fermentation reactor, biochemical reaction is 5.5～6.5 in the pH in acid fermentation stage value in the acid fermentation reactor, and solid retention time is 3～10d;
VI. the dominant microflora in the acid fermentation reactor is the propionic acid flora, and the optimal temperature of propionic acid flora is about 37 ℃, and acid fermentation reactor controlled temperature is 26 ℃～38 ℃;
VII. the propionic acid flora is a facultative anaerobic bacteria, redox potential-140～-20mv, add FeCl 3Realize redox potential, its FeCl 3Dosage 160～320mg/L, with Fe 3+Meter, FeCl 3Dosage and controlled temperature be inversely proportional to, along with the rising of temperature, FeCl 3Dosage reduce; FeCl 3Add and promote to form propionic acid;
The supernatant liquor of the sequence batch (acid fermentation reactor that the combination of VIII. above-mentioned condition produces down directly is added in the acid mine wastewater of sulfur acid salt as the carbon source of sulphate reducing bacteria, and dosage is with mixed COD and SO 4 2-Ratio control, its span of control is 0.9～1.5.
CN2008100544861A 2008-01-23 2008-01-23 Process for producing carbon source for processing wastewater Expired - Fee Related CN101219843B (en)

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Publication number Priority date Publication date Assignee Title
CN103387281A (en) * 2012-05-10 2013-11-13 天津恒英科技有限公司 Acetic acid mixed solution as sewage denitrification carbon source additive
CN106082436A (en) * 2016-08-19 2016-11-09 赛富威环境科技南通有限公司 Multidimensional compounded carbons compositions and its production and use
CN106755139B (en) * 2016-11-29 2021-07-30 湖南大学 Method for efficiently producing propionic acid and valeric acid by culturing anaerobic granular sludge in acidic environment
CN110563252A (en) * 2019-09-05 2019-12-13 安徽省地质矿产勘查局321地质队 Mixed treatment system of acid mining industry waste water and beasts and birds waste water
CN112458014A (en) * 2020-11-26 2021-03-09 广西科技大学 Method for preparing acid-resistant and low-temperature-resistant sulfuric acid reduction complex microbial inoculum by using cassava residues as carbon source and application of microbial inoculum

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Inventor after: Li Yaxin

Inventor after: Song Xiulan

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