CN1803663A - Multi-medium filtering biological denitrification process and apparatus thereof - Google Patents
Multi-medium filtering biological denitrification process and apparatus thereof Download PDFInfo
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- CN1803663A CN1803663A CN 200610002050 CN200610002050A CN1803663A CN 1803663 A CN1803663 A CN 1803663A CN 200610002050 CN200610002050 CN 200610002050 CN 200610002050 A CN200610002050 A CN 200610002050A CN 1803663 A CN1803663 A CN 1803663A
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Abstract
The disclosed denitrification method with least cost compared with prior art comprises: an in-out water system, a filter contained filter medium with size reducing gradually along the inlet direction, a backwash system, and a PLC control system. Wherein, the inlet pump (1) connects with the filter (11) with lower end linked both with the outlet valve (6) and the backwash pump (7) and upper end linked with the backwash outlet valve (9); it arranges the sensor (10) in the filter (11) to contact with water. When the SCOD achieves stable value but less than 100mg/L, putting the medium into filter; using PLC control program to adjust water residence time; backwashing for 2-3h with flux adjusted by the PLC control box; and repeating to filter and backwash. This invention simplifies operation and reduces cost without secondary pollution.
Description
Technical field
The present invention relates to nitric nitrogen in the waste water be removed, substitute the traditional active sludge biological denitrification process, be used for the secondary deep denitrogenation of municipal effluent and contain the trade effluent and the tap water of nitric nitrogen by the filter media mode.
Background technology
Although developed various biological treatments both at home and abroad to improve the sewage water denitrification effect, make nitric nitrogen finally be reduced to nitrogen discharge, but no matter be original sewage work upgrading or newly-built multi-functional sewage treatment plant, realizing that initial cost and running cost all exceed apparatus of the present invention under the same processing target situation.In addition, because the molecular weight ratio of nitric nitrogen is less, the coagulation technology of current widespread use is also of no avail.In traditional drinking water treatment, ion-exchange, biological denitrificaion, reverse osmosis desalination or electrodialysis are the methods of the current removal nitric nitrogen that may be utilized, though say so technically effectively, investment and working cost will exceed tens times of apparatus of the present invention.
Utilize to discharge resolvable chemical oxygen demand SCOD in this class filtration medium of shell itself and the sewage contact process,, thereby substitute traditional outer throwing carbon source, reduce working cost, simplify the operation course, reduce investment cost for anti-nitration reaction provides electron donor; The shell filtrate is promptly realized denitrification process as the carrier of denitrifying bacteria growth simultaneously, can play the effect of holding back suspended substance again, and the filtration medium that lost efficacy can be used to other industry, therefore, this multi-medium filtering biological denitrification process and device thereof are a kind of very promising municipal effluent biological denitrification process, and the theory of this utilization of waste material and measure play crucial effects to the Sustainable development of environment.
Its reaction equation can be expressed as:
Summary of the invention
There is following problem at existing bio-denitrification technology, develops a kind of multi-medium filtering biological denitrification process and device thereof.It mainly is methyl alcohol that existing municipal effluent biological denitrification process need add a large amount of additional carbons, simultaneously must exist active sludge just can finish the denitrification process of nitric nitrogen, not only increase initial cost and running cost, thereby and improved sludge yield and increase the sludge treatment expense.
The present invention is to about need not the innovation that active sludge and carbon source just can realize nitric nitrogen biological denitrification problem.The present invention as filtration medium, utilizes the characteristics of filtration medium self with this class plant materials of shell, gives full play in filtration medium and the sewage contact process to discharge solvability SCOD, simultaneously again as the advantage of denitrifying bacteria growing carrier.The present invention integrates the biological denitrification process of realizing nitric nitrogen with media filtration and two kinds of methods of biological denitrificaion.This device can be according to the on-line monitoring of on-line sensor, regulates hydraulic detention time HRT by the PLC Controlling System, though influent concentration change also can realize nitric nitrogen efficiently, remove fast.
The invention provides a kind of multi-medium filtering biological denitrification device, it is characterized in that, this device mainly comprises four big integral parts, the inlet and outlet system of forming by intake pump 1, inlet valve 2 and flowing water Valve 6, the strainer that contains upper strata filtrate 3, middle level filtrate 4 and lower floor's filtrate 5, by the back-purge system that backwashing pump 7, back flushing inlet valve 8 and back flushing flowing water Valve 9 are formed, include pH, ORP and the PLC Controlling System of temperature sensor 10 with the PLC housing 12 that links to each other with transmitter 10; The intake pump 1 of water inlet system links to each other with inlet valve 2, the pipeline that connects inlet valve 2 enters strainer 11, filtration medium upper strata filtrate 3, middle level filtrate 4,5 size gradings of lower floor's filtrate reduce step by step along the water inlet water (flow) direction, and flowing water Valve 6 links to each other with strainer 11 lower ends; The backwashing pump 7 of back-purge system links to each other with back flushing inlet valve 8, connects back flushing inlet valve 8 by pipeline and links to each other with strainer 11 lower ends, and back flushing flowing water Valve 9 links to each other with strainer 11 upper ends; Be installed in line sensor pH on the fixed support of strainer 11 upper ends, redox potential ORP, T on-line sensor 10 place strainer 11 inside, contact with processed water.
The invention provides a kind of multi-medium filtering biological denitrification process, it is characterized in that, may further comprise the steps:
1, upper strata filtrate 3, middle level filtrate 4 and lower floor's filtrate 5 replace 20-30 days input strainers 11 after filtration medium water outlet SCOD reaches stationary value＜100mg/L through adding water-discharging-Jia water-discharge cycle;
2, open intake pump 1, inlet valve 2 and flowing water Valve 6, close backwashing pump 7, back flushing inlet valve 8 and back flushing flowing water Valve 9, filter processed water, regulate hydraulic detention time according to the PLC sequence of control, be that the PLC Controlling System adopts temperature T, the indicator value of redox potential ORP and pH value on-line sensor 10 approaches 0 control signal as the water outlet nitrate nitrogen content; When being higher than 20-22 ℃ of Controlling System design temperature, reduces inflow temperature hydraulic detention time HRT, otherwise, increase HRT; When redox potential ORP value is higher than setting range 85-95mv, increase HRT, otherwise, reduce HRT; When Inlet and outlet water pH value variation range surpasses set(ting)value 0.3-0.4, reduce HRT, otherwise, increase HRT;
3, when Inlet and outlet water pH value is in stationary value, close intake pump 1, inlet valve 2 and flowing water Valve 6, open backwashing pump 7, back flushing inlet valve 8 and back flushing flowing water Valve 9 and carry out back flushing, according to the flow of on-line sensor indicator value adjusting backwashing pump 7 on PLC housing 12 dial plates, back flushing lasts 2-3 hour;
4, this system repeats 2,3 steps later on successively.
Adopt the parallel connection of a plurality of identical multi-medium filtering nitrogen rejection facility, but the same PLC Controlling System of common use.
Compare with existing activated sludge process biological denitrificaion, have following advantage:
(1) need not active sludge and carbon source and just can realize the nitric nitrogen biological denitrification, reduce volume and floor space, simplify the operation course, reduce investment and running cost;
(2) in operational process, need not manual operation and energy consumption, do not produce secondary pollution;
(3) according to the on-line sensor monitoring, but by PLC Controlling System real-time regulation system hydraulic detention time HRT;
(4) the water outlet concentration of suspension is low.
The present invention is used for the secondary deep denitrogenation of municipal effluent and contains the trade effluent and the tap water of nitric nitrogen.
The invention has the beneficial effects as follows, need not active sludge and carbon source and just can realize the nitric nitrogen biological denitrification, reduce volume and floor space, simplify the operation course, reduce investment and running cost; Need not manual operation and energy consumption in operational process, the shell filtrate of replacing can be processed into gac, does not produce secondary pollution, does not have any waste.
Description of drawings
Fig. 1 is apparatus of the present invention structure principle charts.
1 intake pump; 2 water intaking valves; 3 upper strata filtrates; 4 middle level filtrates; 5 lower floor's filtrates; 6 outlet valves; 7 backwashing pumps; 8 backwashing water water intaking valves; 9 backwashing water outlet valves; 10 on-line sensors; 11 strainers; The 12PLC housing
Embodiment:
Concrete operations step of the present invention has had detailed description at summary of the invention, and this place repeats no more.
Embodiment 1:
Nitrate that is made into respectively by tap water and nitrate, tap water and nitrite with certain laboratory and nitrite solution are as former water, and selected filtration medium is natural shell: apricot capsomere footpath 2～4cm.The selected quartz sand filter media particle diameter of upper and lower layer filtration medium is respectively 3-6cm, 0.5-1cm.Water intake mode is down to stream.Selected filtration unit is a cylindrical synthetic glass reactor, reactor diameter 19cm, high 38cm, reactor bottom quartz sand thickness is 5cm, the thickness of nut-shell is 18cm, and reactor top quartz sand thickness is 5cm, and the useful volume of carrying out the denitrification test is 7.9L.The on-line sensor fixed support is apart from reactor head 10cm, and testing temperature range of living in is 20-22 ℃.Nitrate and nitrite solution have been investigated in test, and the experimental concentration of two kinds of solution is respectively 15-22mg/L and 25mg/L-30mg/L.Test-results is found, with the same hydraulic detention time HRT9 of conventional activated sludge process hour condition under, under two kinds of influent concentration conditions, it is about 50% that the clearance of nitric nitrogen all improves, and the clearance of SS all improves 55-60%, and 100% saves aeration energy consumption, save the expense that aerator and outer carbon source add, do not produce secondary pollution, a normal filtration reaches 1 month working time, and back flushing lasts 2 hours can reply the normal filtration process.
Embodiment 2:
As former water, selected filtration medium is natural walnut capsomere footpath 1～2cm with certain factory industry waste water processing station high-nitrate state nitrogen waste water; The selected quartz sand filter media particle diameter of upper and lower layer filtration medium is respectively 3-6cm, 0.5-1cm.Water intake mode is down to stream.The continuous flow reactor that test is selected for use is an open reactor of rectangle, the long 93cm of reactor, wide 20cm, reactor bottom quartz sand thickness is 3cm, the thickness of nut-shell is 13cm, and reactor top quartz sand thickness is that 2cm is thick, and the useful volume of continuous flow reactor is 33.5L.Test has been investigated nitrate solution concentration and has been respectively 30mg/L-35mg/L and 50-52mg/L.Test-results is found, with 9 hours conditions of the same hydraulic detention time of conventional activated sludge process under, the clearance of nitric nitrogen all improves 43-47.5%, water outlet SS improves 42-46%, save aerator, save the expense that large-scale activated-sludge processing apparatus and outer carbon source add, need not sludge treatment device, need not manual operation, do not produce secondary pollution.The normal filtration process reaches 3 months, and back flushing lasts 3 hours and replys normal filtration, compares only several days normal filtration time with traditional quartz sand filtration device, even several hours, the back flushing frequency reduces greatly.
Claims (2)
1. multi-medium filtering biological denitrification device, it is characterized in that, this device mainly comprises four big integral parts, the inlet and outlet system of forming by intake pump (1), inlet valve (2) and flowing water Valve (6), the strainer that contains upper strata filtrate (3), middle level filtrate (4) and lower floor's filtrate (5), by the back-purge system that backwashing pump (7), back flushing inlet valve (8) and back flushing flowing water Valve (9) are formed, include pH, ORP and the PLC Controlling System of temperature sensor (10) with the PLC housing (12) that links to each other with transmitter (10); The intake pump of water inlet system (1) links to each other with inlet valve (2), the pipeline that connects inlet valve (2) enters strainer (11), filtration medium upper strata filtrate (3), middle level filtrate (4), lower floor's filtrate (5) size grading reduce step by step along the water inlet water (flow) direction, and flowing water Valve (6) links to each other with strainer (11) lower end; The backwashing pump of back-purge system (7) links to each other with back flushing inlet valve (8), connects back flushing inlet valve (8) by pipeline and links to each other with strainer (11) lower end, and back flushing flowing water Valve (9) links to each other with strainer (11) upper end; Be installed in line sensor pH on the fixed support of strainer (11) upper end, redox potential ORP, T on-line sensor (10) place strainer (11) inside, contact with processed water.
2, a kind of multi-medium filtering biological denitrification process is characterized in that, may further comprise the steps:
1) upper strata filtrate (3), middle level filtrate (4) and lower floor's filtrate (5) replace dropped into strainer (11) in 20-30 days after filtration medium water outlet SCOD reach stationary value＜100mg/L through adding water-discharging-Jia water-discharge cycle;
2) open intake pump (1), inlet valve (2) and flowing water Valve (6), close backwashing pump (7), back flushing inlet valve (8) and back flushing flowing water Valve (9), filter processed water, regulate hydraulic detention time according to the PLC sequence of control, be that the PLC Controlling System adopts temperature T, the indicator value of redox potential ORP and pH value on-line sensor (10) approaches 0 control signal as the water outlet nitrate nitrogen content; When being higher than 20-22 ℃ of Controlling System design temperature, reduces inflow temperature hydraulic detention time HRT, otherwise, increase HRT; When redox potential ORP value is higher than setting range 85-95mv, increase HRT, otherwise, reduce HRT; When Inlet and outlet water pH value variation range surpasses set(ting)value 0.3-0.4, reduce HRT, otherwise, increase HRT;
3) when Inlet and outlet water pH value is in stationary value, close intake pump (1), inlet valve (2) and flowing water Valve (6), open backwashing pump (7), back flushing inlet valve (8) and back flushing flowing water Valve (9) and carry out back flushing, according to the flow of on-line sensor indicator value adjusting backwashing pump (7) on PLC housing (12) dial plate, back flushing lasts 2-3 hour;
4) this system repeats 2 later on successively), 3) step.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100020509A CN100497195C (en) | 2006-01-24 | 2006-01-24 | Multi-medium filtering biological denitrification process and apparatus thereof |
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| CNB2006100020509A CN100497195C (en) | 2006-01-24 | 2006-01-24 | Multi-medium filtering biological denitrification process and apparatus thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1931750B (en) * | 2006-10-10 | 2010-10-06 | 江苏金山环保工程有限公司 | Petrochemical effluent treating and reusing process |
| CN103043786A (en) * | 2012-12-19 | 2013-04-17 | 清华大学 | Slow carbon source releasing media filter device and process with deep denitrification function |
| CN107308720A (en) * | 2017-08-17 | 2017-11-03 | 长兴上拓环境科技有限公司 | A kind of latent throwing formula sand filtration pretreatment system |
-
2006
- 2006-01-24 CN CNB2006100020509A patent/CN100497195C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1931750B (en) * | 2006-10-10 | 2010-10-06 | 江苏金山环保工程有限公司 | Petrochemical effluent treating and reusing process |
| CN103043786A (en) * | 2012-12-19 | 2013-04-17 | 清华大学 | Slow carbon source releasing media filter device and process with deep denitrification function |
| CN103043786B (en) * | 2012-12-19 | 2014-04-16 | 清华大学 | Slow carbon source releasing media filter device and process with deep denitrification function |
| CN107308720A (en) * | 2017-08-17 | 2017-11-03 | 长兴上拓环境科技有限公司 | A kind of latent throwing formula sand filtration pretreatment system |
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| Publication number | Publication date |
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| CN100497195C (en) | 2009-06-10 |
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Effective date of registration: 20150924 Address after: 72 No. 401121 Chongqing northern new hi tech Park Avenue Patentee after: Chongqing Kangda Environmental Protection Industry (Group) Co., Ltd. Address before: 100022 No. 100 Chaoyang District Ping Tian Park, Beijing Patentee before: Beijing University of Technology |