CN102718316A - Biological denitrification promotion method using carbon source supplemented by carrying out low-intensity ultrasonic sludge disintegration and hydrolytic acidification on disintegrated sludge and straws and application of method - Google Patents
Biological denitrification promotion method using carbon source supplemented by carrying out low-intensity ultrasonic sludge disintegration and hydrolytic acidification on disintegrated sludge and straws and application of method Download PDFInfo
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Abstract
The invention discloses a biological denitrification promotion method using carbon sources supplemented by carrying out low intensity ultrasonic sludge disintegration and hydrolytic acidification on disintegrated sludge and straws and application of the method. The method comprises the following steps of: firstly, disintegrating residual sludge through low intensity ultrasonic; then mixing disintegrated sludge with straws and carrying out hydrolytic acidification; and finally refluxing liquid subjected to hydrolytic acidification. The method has the advantages that crop straws are preprocessed in the way of being soaked in the residual sludge, and hydrolase present in the residual sludge are fully utilized, so that the effect of preprocessing the crop straws is improved, no additional carbon source is required, and the biological denitrification efficiency is enhanced. The method can be applied to upgrading reconstruction of biotreatment techniques of anaerobic-anoxic-aerobic and anoxic-aerobic sludge treatment plants, the biological denitrification efficiency is enhanced, and the reclamation of sludge and crop straws are realized.
Description
Technical field
The invention belongs to the biological wastewater treatment field, relate generally to method and application thereof that a kind of low intensity ultrasound breaking sludge and stalk acidication supplementary carbon source promote biological denitrificaion.
Background technology
Eutrophication problem is one of main water pollution problems of facing of the world today, and nitrogen, phosphorus are the principal elements that causes body eutrophication.Raising and domestic and international strictness day by day along with Public Environmental Awareness to nitrogen, phosphorus emission limit set standard.Bio-denitrification technology is a current application sewage water denitrification technology the most widely, promptly realizes the removal of nitrogen through nitrifier, denitrifying bacteria effect, and competent carbon source is to realize the key of efficient denitrification.It is generally acknowledged; When biological tank water inlet C/N is lower than 3.4; Need additional carbon to guarantee good Nitrogen removal effect, and the sewage C/N that the most of municipal sewage plant of China gets into biological tank is lower than this value than all, the organic carbon source deficiency causes the biological denitrificaion inefficiency in the sewage.For improving biological denitrificaion efficient, realize water outlet total nitrogen (TN) qualified discharge, need add methyl alcohol, the additional organic carbon source of ethanol, so just increased sewage work's running cost.It is thus clear that whether the solution of carbon source problem is concerning the height of biological denitrificaion efficient and the height of municipal sewage plant's running cost.There is organic carbon source in the excess sludge, but can be converted into voltaile fatty acid (VFAs), need seek new carbon source form again by the comparatively small amt that denitrifying bacteria utilizes.
In addition, the annual agricultural crop straw output of China is huge, and organic content is high in the agricultural crop straw, and can acidication be VFAs by denitrifying bacteria as utilization of carbon source.But the vast Rural areas in China, agricultural crop straw major part are all directly burned or discarded banking up.How to utilize organism raising biological denitrificaion efficient in the agricultural crop straw, China's agricultural crop straw is utilized for this and the low carbon-nitrogen ratio sewage bio-denitrification technology develops significant.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art; To the insufficient problem of carbon source in the excess sludge; The invention provides the technology that a kind of low intensity ultrasound breaking sludge and agricultural crop straw acidication supplementary carbon source promote biological denitrificaion and mud decrement, solve that present sludge discharge is big, agricultural crop straw is properly disposed, denitrifying carbon source adds the high problem of cost.
The object of the invention is achieved through following technical proposals:
A kind of low intensity ultrasound breaking sludge and stalk acidication supplementary carbon source promote the method for biological denitrificaion; Carry out according to following step: (be that step 1) utilizes low-intensity ultrasonic to crack excess sludge at first; After (being step 2) will be cracked excess sludge and stalk mixing pre-treatment then; The acidifying that is hydrolyzed (is that step 3) refluxes acidication liquid at last.
In the said step 1, cracking the pre-treatment surplus sludge volume is 5%-10% of flooding quantity (being the settling pit water outlet), and it is 2-3wt% that mud is concentrated into solid content, ultrasonic disintegration time 1-10min, preferred 3-8min; Cracking used ultrasonic processor form is many sonde-types (for example 4-8 probes), and ultrasonic frequency is 20-40kHz, and probe diameter is 20-30mm, and ultrasonic acoustic density is 0.2-0.8kW/m
3, preferred 0.5-0.8kW/m
3
In the said step 2; Said stalk can be selected agricultural crop straw (for example farm crop corn straw, wheat stalk, broomcorn straw, rice straw) for use; Utilize mechanical crusher that it is pulverized; It is subsequent use that grinding and sieving, the stalk after the screening leave air seasoning place preservation in, stalk powder gravel size decision 20～50 orders.
In the said step 2, the pre-treatment soak solution concentrates excess sludge (water ratio 97-98wt%) for cracking the back; During pre-treatment; Take by weighing screening back agricultural crop straw powder; According to solid-to-liquid ratio is 1:15～1:25 (stalk quality: crack the back and concentrate the excess sludge volume), and it is dropped into the stalk fermentation vat, is soaked in to concentrate in the excess sludge; Hydraulic detention time in the pond (HRT, i.e. pretreatment time) is 12-48h.
In the said step 2, excess sludge mixes the laggard hydrolysis acidulated pool acidification that is hydrolyzed of going into stalk, through abundant acidication; Degradable chemical at a slow speed in mud and the agricultural crop straw; Like material decomposition such as Mierocrystalline cellulose, semicellulose, protein, polysaccharide, lipids is a large amount of volatile fat acids materials (VFAs), and like acetate, propionic acid, butyric acid etc., this type material can be used as the required carbon source of denitrification; Realize the biological denitrification denitrogenation, the hydrolysis acidification pool optimal water power standing time is 24-72h.
In the said step 3, mixed-liquor return to biological anoxic pond front end behind the acidication, it is carbon source that denitrifying bacterium utilizes it, and nitrate nitrogen in the sewage is converted into nitrogen, realizes biological denitrificaion, the anoxic pond optimal water power standing time is 2-4h.
Compare with general excess sludge acidication supplementing denitrifying carbon source technology; The invention has the advantages that: adopt excess sludge to soak the pre-treatment agricultural crop straw, made full use of the lytic enzyme that exists in the excess sludge, improved the crop straw pre-treatment effect; Remedied the insufficient problem of acidication carbon source in the excess sludge; Make full use of the carbon source in excess sludge and the agricultural crop straw, need not additional carbon, improved biological denitrificaion efficient.The present invention can be applied to anaerobic-anoxic-aerobic (A2O) or anaerobic-aerobic (AO technology) sewage work biological treatment upgrading, newly-built biological dephosphorize denitrification technology etc.; After promoting, can improve biological denitrificaion efficient; Reduce sludge yield; Realize mud and agricultural straw resourceization, reduce working cost, produce significant environmental benefit and economic benefit.
Description of drawings
Fig. 1 is applied to the schema of anaerobism-anoxic-aerobic biological denitrification process for the present invention, the front end of backflow part mud to anaerobic pond in the second pond wherein, and the nitrification liquid of Aerobic Pond outlet is back to the front end of anoxic pond; Excess sludge is participated in the mixing of stalk and the front end that hydrolysis posthydrolysis liquid is back to anoxic pond after concentrated and low-intensity ultrasonic crack.
Embodiment
Below in conjunction with specific embodiment the present invention is further described; The flow process of the anaerobism-anoxic-aerobic biological denitrification process of employing shown in accompanying drawing 1; The front end of backflow part mud to anaerobic pond in the second pond wherein; With the usage quantity of mud in the assurance system, the nitrification liquid of Aerobic Pond outlet is back to the front end of anoxic pond, with the usage quantity of nitrification liquid in the assurance system; The part excess sludge is through after concentrating and cracking in the second pond, and after the mixing and hydrolysis of participation stalk, hydrolyzed solution is back to the front end of anoxic pond; The part excess sludge then discharges in the second pond.The settling pit aquifer yield is the flooding quantity Q of system.
Embodiment 1
It is 2.3% that the mud of 6%Q (Q is a flooding velocity) is concentrated into solid content through gravity, is delivered to 8 probe type ultrasonic treaters through sludge pump and cracks, and the ultrasonic reactor frequency is 20kHz, and probe diameter is 20mm, and acoustic density is 0.38kW/m
3, the time of cracking is 3min.Crack TCOD raising 1263mg/L in the mud liquid phase of back, improve 2 times before main lytic enzyme alpha-glucosidase activity cracks in the mud liquid phase, protease activity improves 3 times.
According to solid-to-liquid ratio is that 1:15 (stalk quality: crack back excess sludge volume) takes by weighing the corn straw powder that 20 mesh sieves are crossed in the screening back, with the corn straw powder with crack back excess sludge thorough mixing, guarantee that stalk is soaked in the excess sludge.In the stalk fermentation vat, handle 24h.Solution after pretreatment mutually in total COD (TCOD) improve 4463mg/L.
Soak back corn straw and the excess sludge mixed solution entering hydrolysis acidification pool acidification reaction 24h that is hydrolyzed; VFAs content reaches 5212mg/L in the mixed solution of reaction back; Mixed-liquor return to anoxic pond front end replenishes the required carbon source of denitrification afterwards, and the anoxic pond hydraulic detention time is 2h.Whole technology is moved 3 months continuously summer, the denitrification effect stability.Monitoring data is found, water inlet COD (COD) 100-200mg/L, total nitrogen (TN) 40-50mg/L; Second pond water outlet COD40-50mg/L, TN 8-12mg/L, water outlet reaches one-level A standard (GB18918-2002); And reduced the excess sludge discharge amount, realized mud decrement.
Embodiment 2
It is 2% that the mud of 8%Q (Q is a flooding velocity) is concentrated into solid content through gravity, is delivered to 4 probe type ultrasonic treaters through sludge pump and cracks, and the ultrasonic reactor frequency is 28kHz, and probe diameter is 25mm, and acoustic density is 0.50kW/m
3, the time of cracking is 4min.Crack TCOD raising 1742mg/L in the mud liquid phase of back, improve 2.3 times before main lytic enzyme alpha-glucosidase activity cracks in the mud liquid phase, protease activity improves 3.5 times.
According to solid-to-liquid ratio is that 1:20 (stalk quality: crack back excess sludge volume) takes by weighing the corn straw powder that 30 mesh sieves are crossed in the screening back, with the corn straw powder with crack back excess sludge thorough mixing, guarantee that stalk is soaked in the excess sludge.In the stalk fermentation vat, handle 48h.Solution after pretreatment mutually in total COD (TCOD) improve 6236mg/L.
Soak back corn straw and the excess sludge mixed solution entering hydrolysis acidification pool acidification reaction 30h that is hydrolyzed; VFAs content reaches 6314mg/L in the mixed solution of reaction back; Mixed-liquor return to anoxic pond front end replenishes the required carbon source of denitrification afterwards, and the anoxic pond hydraulic detention time is 4h.Whole technology is moved 3 months continuously autumn, the denitrification effect stability.Monitoring data is found, water inlet COD (COD) 100-200mg/L, and total nitrogen (TN) 30-45mg/L, second pond water outlet COD40-50mg/L, TN 10-12mg/L, water outlet reaches one-level A standard (GB18918-2002).
Embodiment 3
It is 2.5% that the mud of 10%Q (Q is a flooding velocity) is concentrated into solid content through gravity, is delivered to 6 probe type ultrasonic treaters through sludge pump and cracks, and the ultrasonic reactor frequency is 30kHz, and probe diameter is 30mm, and acoustic density is 0.68kW/m
3, the time of cracking is 9min.Crack TCOD raising 2327mg/L in the mud liquid phase of back, improve 2.6 times before main lytic enzyme alpha-glucosidase activity cracks in the mud liquid phase, protease activity improves 3.8 times.
According to solid-to-liquid ratio is that 1:15 (stalk quality: crack back excess sludge volume) takes by weighing the rice straw powder that 40 mesh sieves are crossed in the screening back, with rice straw powder and excess sludge thorough mixing, guarantees that stalk is soaked in the excess sludge.In the stalk fermentation vat, handle 48h.The middle mutually TCOD of solution after pretreatment improves 4256mg/L.
Soak back rice straw and the excess sludge mixed solution entering hydrolysis acidification pool acidification reaction 48h that is hydrolyzed; VFAs content reaches 6542mg/L in the mixed solution of reaction back; Mixed-liquor return to anoxic pond front end replenishes the required carbon source of denitrification afterwards, and the anoxic pond hydraulic detention time is 3h.Whole technology is moved 3 months continuously winter, the denitrification effect stability.Monitoring data is found, water inlet COD (COD) 100-200mg/L, and total nitrogen (TN) 30-45mg/L, second pond water outlet COD40-50mg/L, TN 10-15mg/L, water outlet reaches one-level A standard (GB18918-2002).
Embodiment 4
It is 2.8% that the mud of 9%Q (Q is a flooding velocity) is concentrated into solid content through gravity, is delivered to 8 probe type ultrasonic treaters through sludge pump and cracks, and the ultrasonic reactor frequency is 40kHz, and probe diameter is 20mm, and acoustic density is 0.76kW/m
3, the time of cracking is 8min.Crack TCOD raising 3673mg/L in the mud liquid phase of back, improve 2.5 times before main lytic enzyme alpha-glucosidase activity cracks in the mud liquid phase, protease activity improves 3.6 times.
According to solid-to-liquid ratio is that 1:20 (stalk quality: crack back excess sludge volume) takes by weighing the broomcorn straw powder that 30 mesh sieves are crossed in the screening back, with broomcorn straw powder and excess sludge thorough mixing, guarantees that stalk is soaked in the excess sludge.In the stalk fermentation vat, handle 12h.The middle mutually TCOD of solution after pretreatment improves 3562mg/L.
Soak back broomcorn straw and the excess sludge mixed solution entering hydrolysis acidification pool acidification reaction 48h that is hydrolyzed; VFAs content reaches 7042mg/L in the mixed solution of reaction back; Mixed-liquor return to anoxic pond front end replenishes the required carbon source of denitrification afterwards, and the anoxic pond hydraulic detention time is 4h.Whole technology is moved 3 months continuously autumn, the denitrification effect stability.Monitoring data is found, water inlet COD (COD) 150-230mg/L, and total nitrogen (TN) 35-50mg/L, second pond water outlet COD40-50mg/L, TN 10-15mg/L, water outlet reaches one-level A standard (GB18918-2002).
Embodiment 5
It is 2.2% that the mud of 9%Q (Q is a flooding velocity) is concentrated into solid content through gravity, and mud is delivered to 8 probe type ultrasonic treaters through sludge pump and cracks, and the ultrasonic reactor frequency is 28kHz, and probe diameter is 30mm, and acoustic density is 0.80kW/m
3, the time of cracking is 10min.Crack TCOD raising 2523mg/L in the mud liquid phase of back, improve 2.5 times before main lytic enzyme alpha-glucosidase activity cracks in the mud liquid phase, protease activity improves 3.6 times.
According to solid-to-liquid ratio be 1:25 (the stalk quality: the excess sludge volume) take by weighing the broomcorn straw powder that 40 mesh sieves are crossed in screening back, with the broomcorn straw powder with crack back excess sludge thorough mixing, guarantee that stalk is soaked in the excess sludge.In the stalk fermentation vat, handle 48h.The middle mutually TCOD of solution after pretreatment improves 4256mg/L.
Soak back broomcorn straw and the excess sludge mixed solution entering hydrolysis acidification pool acidification reaction 60h that is hydrolyzed; VFAs content reaches 8087mg/L in the mixed solution of reaction back; Mixed-liquor return to anoxic pond front end replenishes the required carbon source of denitrification afterwards, and the anoxic pond hydraulic detention time is 4h.Whole technology is moved 3 months continuously winter, the denitrification effect stability.Monitoring data is found, water inlet COD (COD) 100-200mg/L, and total nitrogen (TN) 30-45mg/L, second pond water outlet COD40-50mg/L, TN 10-15mg/L, water outlet reaches one-level A standard (GB18918-2002).
Embodiment 6
It is 3% that the mud of 7%Q (Q is a flooding velocity) is concentrated into solid content through gravity, is delivered to 8 probe type ultrasonic treaters through sludge pump and cracks, and the ultrasonic reactor frequency is 35kHz, and probe diameter is 20mm, and acoustic density is 0.2kW/m
3, the time of cracking is 1min.Crack TCOD raising 2673mg/L in the mud liquid phase of back, improve 1.5 times before main lytic enzyme alpha-glucosidase activity cracks in the mud liquid phase, protease activity improves 1.6 times.
According to solid-to-liquid ratio is that 1:20 (stalk quality: crack back excess sludge volume) takes by weighing the broomcorn straw powder that 30 mesh sieves are crossed in the screening back, with broomcorn straw powder and excess sludge thorough mixing, guarantees that stalk is soaked in the excess sludge.In the stalk fermentation vat, handle 48h.The middle mutually TCOD of solution after pretreatment improves 4256mg/L.
Soak back broomcorn straw and the excess sludge mixed solution entering hydrolysis acidification pool acidification reaction 72h that is hydrolyzed; VFAs content reaches 7042mg/L in the mixed solution of reaction back; Mixed-liquor return to anoxic pond front end replenishes the required carbon source of denitrification afterwards, and the anoxic pond hydraulic detention time is 4h.Whole technology is moved 3 months continuously autumn, the denitrification effect stability.Monitoring data is found, water inlet COD (COD) 150-230mg/L, and total nitrogen (TN) 35-50mg/L, second pond water outlet COD40-50mg/L, TN 10-15mg/L, water outlet reaches one-level A standard (GB18918-2002).
Embodiment 7
It is 3% that the mud of 5%Q (Q is a flooding velocity) is concentrated into solid content through gravity, is delivered to 8 probe type ultrasonic treaters through sludge pump and cracks, and the ultrasonic reactor frequency is 40kHz, and probe diameter is 30mm, and acoustic density is 0.76kW/m
3, the time of cracking is 10min.Crack TCOD raising 3673mg/L in the mud liquid phase of back, improve 2.5 times before main lytic enzyme alpha-glucosidase activity cracks in the mud liquid phase, protease activity improves 3.6 times.
According to solid-to-liquid ratio is that 1:20 (stalk quality: crack back excess sludge volume) takes by weighing the broomcorn straw powder that 30 mesh sieves are crossed in the screening back, with broomcorn straw powder and excess sludge thorough mixing, guarantees that stalk is soaked in the excess sludge.In the stalk fermentation vat, handle 12h.The middle mutually TCOD of solution after pretreatment improves 4256mg/L.
Soak back broomcorn straw and the excess sludge mixed solution entering hydrolysis acidification pool acidification reaction 48h that is hydrolyzed; VFAs content reaches 7042mg/L in the mixed solution of reaction back; Mixed-liquor return to anoxic pond front end replenishes the required carbon source of denitrification afterwards, and the anoxic pond hydraulic detention time is 4h.Whole technology is moved 3 months continuously autumn, the denitrification effect stability.Monitoring data is found, water inlet COD (COD) 150-230mg/L, and total nitrogen (TN) 35-50mg/L, second pond water outlet COD40-50mg/L, TN 10-15mg/L, water outlet reaches one-level A standard (GB18918-2002).
More than the present invention has been done exemplary description; Should be noted that; Under the situation that does not break away from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (9)
1. low intensity ultrasound breaking sludge and stalk acidication supplementary carbon source promote the method for biological denitrificaion; It is characterized in that; Carry out according to following step: (be that step 1) utilizes low-intensity ultrasonic to crack excess sludge at first; After (being step 2) will be cracked excess sludge and stalk mixing pre-treatment then, the acidifying that is hydrolyzed (was that step 3) refluxes acidication liquid at last.
2. a kind of low intensity ultrasound breaking sludge according to claim 1 and stalk acidication supplementary carbon source promote the method for biological denitrificaion; It is characterized in that; In the said step 1, cracking the pre-treatment surplus sludge volume is 5%-10% of flooding quantity, and it is 2-3wt% that mud is concentrated into solid content; Ultrasonic disintegration time 1-10min, preferred 3-8min; Cracking used ultrasonic processor form is many sonde-types, and ultrasonic frequency is 20-40kHz, and probe diameter is 20-30mm, and ultrasonic acoustic density is 0.2-0.8kW/m
3
3. a kind of low intensity ultrasound breaking sludge according to claim 2 and stalk acidication supplementary carbon source promote the method for biological denitrificaion, it is characterized in that, in the said step 1, said ultrasonic processor adopts many sonde-types of 4-8 probes; Said ultrasonic acoustic density is 0.5-0.8kW/m
3
4. a kind of low intensity ultrasound breaking sludge according to claim 1 and stalk acidication supplementary carbon source promote the method for biological denitrificaion; It is characterized in that in the said step 2, said stalk can be selected agricultural crop straw for use; Utilize mechanical crusher that it is pulverized; It is subsequent use that grinding and sieving, the stalk after the screening leave air seasoning place preservation in, stalk powder gravel size decision 20～50 orders.
5. a kind of low intensity ultrasound breaking sludge according to claim 4 and stalk acidication supplementary carbon source promote the method for biological denitrificaion, it is characterized in that said agricultural crop straw is corn straw, wheat stalk, broomcorn straw or rice straw.
6. a kind of low intensity ultrasound breaking sludge according to claim 1 and stalk acidication supplementary carbon source promote the method for biological denitrificaion, it is characterized in that, in the said step 2, the pre-treatment soak solution concentrates excess sludge, water ratio 97-98wt% for cracking the back; During pre-treatment, take by weighing screening back stalk powder, according to solid-to-liquid ratio stalk quality: cracking the back, to concentrate the excess sludge volume be 1:15～1:25, and it is dropped into the stalk fermentation vat, is soaked in to concentrate in the excess sludge, and hydraulic detention time is 12-48h in the pond.
7. a kind of low intensity ultrasound breaking sludge according to claim 1 and stalk acidication supplementary carbon source promote the method for biological denitrificaion; It is characterized in that; In the said step 2, excess sludge mixes the laggard hydrolysis acidulated pool acidification that is hydrolyzed of going into stalk, through abundant acidication; In mud and the agricultural crop straw at a slow speed degradable chemical be decomposed into a large amount of volatile fat acids materials, the hydrolysis acidification pool optimal water power standing time is 24-72h.
8. a kind of low intensity ultrasound breaking sludge according to claim 1 and stalk acidication supplementary carbon source promote the method for biological denitrificaion; It is characterized in that, in the said step 3, mixed-liquor return to biological anoxic pond front end behind the acidication; It is carbon source that denitrifying bacterium utilizes it; Nitrate nitrogen in the sewage is converted into nitrogen, realizes biological denitrificaion, the anoxic pond optimal water power standing time is 2-4h.
9. the application of the method that a kind of low intensity ultrasound breaking sludge as claimed in claim 1 and stalk acidication supplementary carbon source promote biological denitrificaion in anaerobic-anoxic-aerobic or anaerobic-aerobic sewage treatment process.
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| CN108408894A (en) * | 2017-02-09 | 2018-08-17 | 中国石油化工股份有限公司 | A kind of method and device of eddy flow enhanced biodegradation treated sewage |
| CN110054288A (en) * | 2019-05-22 | 2019-07-26 | 中国市政工程华北设计研究总院有限公司 | A method of using fruit juice waste liquid as sewage treatment plant's supplementary carbon source enhanced biological nitrogen removal |
| CN111392996A (en) * | 2020-05-14 | 2020-07-10 | 河南工业大学 | Method for breaking sludge by combining magnetization, acidification and ultrasound |
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| CN110054288A (en) * | 2019-05-22 | 2019-07-26 | 中国市政工程华北设计研究总院有限公司 | A method of using fruit juice waste liquid as sewage treatment plant's supplementary carbon source enhanced biological nitrogen removal |
| CN111392996A (en) * | 2020-05-14 | 2020-07-10 | 河南工业大学 | Method for breaking sludge by combining magnetization, acidification and ultrasound |
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Application publication date: 20121010 |