CN104556379A - Sewage biological denitrifying device and process - Google Patents
Sewage biological denitrifying device and process Download PDFInfo
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- CN104556379A CN104556379A CN201410853111.7A CN201410853111A CN104556379A CN 104556379 A CN104556379 A CN 104556379A CN 201410853111 A CN201410853111 A CN 201410853111A CN 104556379 A CN104556379 A CN 104556379A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/166—Nitrites
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a sewage biological denitrifying device and process. The device includes a monitoring device as well as a homogeneous adjusting tank, a denitrifying system, a nitrifying pool and a secondary sedimentation tank all connected with one another in sequence through pipelines; the homogeneous adjusting tank is connected with an acid-base adding system; the denitrifying system includes a first-level denitrifying pool and a second-level denitrifying pool, both of which are connected in sequence through pipelines; the second-level denitrifying pool is connected with a silicon source adding system; the monitoring device includes a PLC and a display. The sewage biological denitrifying process includes the following steps: the sewage is mixed with a return fluid after the pH value of the sewage is adjusted, and denitrifying bacteria denitrify the nitrate nitrogen in the return fluid by utilizing organic carbon sources in the sewage; organic carbon sources are added to the mixed liquor, and the denitrifying bacteria use the additionally added organic carbon sources to completely remove the nitrate nitrogen in the mixed liquor; the nitrifying bacteria oxidize the ammonia nitrogen in the mixed liquor into nitrate nitrogen; the mixed liquor partially flows back to be subjected to denitrification treatment; the sludge and water in the mixed liquor are separated through precipitation, and then the clean water is discharged. According to the invention, the silicon sources that are required to be additionally added are not needed, and the economic cost is reduced.
Description
Technical field
The present invention relates to bio-denitrification technology field, in particular to a kind of bio-denitrifying sewage treatment facility and technique.
Background technology
In municipal effluent, nitrogen has four kinds of forms, i.e. organonitrogen, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen.Organic nitrogen in sewage, mainly from amino acid, peptide and protein, is all the product in bioprocess, and the increase of organonitrogen illustrates that water pollutions is serious.Ammonia nitrogen in sewage is the product of microbial activities, in collection, conveying sewage process, due to the effect of microorganism, organonitrogen is decomposed and becomes ammonia nitrogen.Ammonia nitrogen refers to the general name of ammonium ion and nitrogen, and it exists with ammonium root or nitrogen gas dissolved form, is shown below:
The size of ammonia nitrogen amount in water is one of index weighing water pollution degree.Nitrite nitrogen is the intermediate product of nature nitrogen cycle, and it is that proteinous material produces nitrite nitrogen after decomposing.General nitrite nitrogen is unstable, and it can change into nitrate nitrogen very soon.The existence of nitrate nitrogen, illustrates that water body has been subject to Organic and has polluted.
Current sewage disposal generally adopts bio-denitrification technology, and this technology is mainly based on the nitrification and denitrification effect of microorganism.Nitrification is under aerobic condition, and ammonium oxidation is the biological respinse of nitrite nitrogen and nitric nitrogen by nitrobacteria; Denitrification is under anoxic conditions, and nitric nitrogen, nitrite nitrogen and other reduction of nitrogen oxides are the biological respinse of nitrogen by denitrifying bacterium, and detailed process is as follows:
Nitrification process under aerobic condition: nitrobacteria → NH
4 +→ NO
2 -→ NO
3 -;
Denitrification process: NO under anoxia condition
3 -→ NO
2 -→ N
2o
-→ N
2.
The sewage disposal device realizing above-mentioned reaction process generally comprises nitrification tank and denitrification pond, in nitrification process, generally need the DO (dissolved oxygen amount) maintaining nitrification tank at more than 2mg/l, only having under this condition, can be just nitric nitrogen by ammonia nitrogen exhaustive oxidation; At denitrification process, carbon source, as the electron donor of denitrification process, is the important factor in order affecting denitrification process, if when in sewage, carbon-nitrogen ratio is on the low side, needs to consider to use the carbon source such as extraneous methanol, glucose to provide denitrification electron donor.
But, at present when using above-mentioned treatment facility to carry out the denitrogenation processing of sewage, in nitrification process, nitrite nitrogen is converted in nitric nitrogen process, consume a certain amount of oxygen, but in denitrification process, nitric nitrogen transforms in order to nitrite nitrogen again, so in this conversion process, cause oxygen depletion higher, simultaneously in nitrification process, also need gas blower or other aeration facilities to provide air for nitrification tank, cause mechanical energy consumption higher; In addition, prior art is in denitrification process, carbon source original in sewage is not utilized, but directly carbon source is added in denitrification pond, so the electron donor of denitrification process all depends on additional carbon source, add the usage quantity of carbon source, waste resource, improve the Financial cost of enterprise, not there is practicality.
Summary of the invention
For the not only oxygen depletion solving biological denitrificaion treatment process of the prior art existence is high, and mechanical energy consumption is high, and wastes the problems such as too much carbon source, the object of the present invention is to provide a kind of bio-denitrifying sewage treatment facility and technique.
For achieving the above object, a kind of bio-denitrifying sewage treatment facility is provided in the embodiment of the present invention, the homogeneous equalizing tank, denilrification system, nitrification tank and the second pond that comprise monitoring device and connected successively by pipeline, nitrification tank is connected by sewage backflow pipe with denilrification system, second pond is connected by mud return line with denilrification system, homogeneous equalizing tank connects soda acid add-on system, denilrification system comprises the one-level denitrification pond and secondary denitrification pond that are connected successively by pipeline, and pond connects carbon source add-on system to secondary denitrification;
The indicating meter that monitoring device comprises PLC, is connected with PLC, PLC is connected with soda acid add-on system, carbon source add-on system respectively.
In the technical program, this device structure is simple, by homogeneous equalizing tank, denilrification system, nitrification tank and second pond form Prepositive denitrification biological denitrificaion treatment facility, in this equipment, denilrification system is divided into one-level denitrification pond and secondary denitrification pond, in one-level denitrification pond, utilize the carbon source of sewage self to carry out anti-nitration reaction, in secondary denitrification pond, additionally add carbon source by carbon source add-on system complete remaining anti-nitration reaction, this denilrification system and existing denilrification system, reduce the addition of carbon source, save Financial cost, in addition soda acid add-on system is all connected with PLC with carbon source add-on system, PLC is according to the detection data of field instrument, automatically the addition of soda acid and carbon source is opened or closed, complete without the need to human assistance, improve the automatization that equipment runs, really accomplish telemanagement, save the working time of workman, reduce labour intensity, improve equipment operating efficiency, apparatus and process flow process is simple in addition, efficiently, floor space is little, be convenient to the construction of factory building, cost of investment is low, production efficiency is high, practical.
Further, carbon source add-on system comprises carbon source pond, and carbon source pond is connected with secondary denitrification pond by pump of constant delivery type; Soda acid add-on system comprises acid-base solution pond, and acid-base solution pond is connected with homogeneous equalizing tank by pump of constant delivery type, and pump of constant delivery type is connected with PLC.In the technical program, carbon source add-on system and soda acid add-on system are further described, are controlled the On/Off of pump of constant delivery type by PLC, carbon source and soda acid is regulated to be easy to addition, accurate control is accomplished to carbon source and pH value, has improve equipment operating efficiency, save manpower.
Further, all pH meter is installed in homogeneous equalizing tank, one-level denitrification pond, secondary denitrification pond and nitrification tank, in one-level denitrification pond, secondary denitrification pond and nitrification tank, also dissolved oxygen meter is installed,
Wherein, organic carbon detector and ammonia nitrogen tester are also installed in secondary denitrification pond; PH meter, dissolved oxygen meter, organic carbon detector and ammonia nitrogen tester are all connected with PLC.
In the technical program, pH meter for detecting the pH in each reaction tank, and will detect data transfer to PLC, be simultaneously displayed on display screen, when the pH in homogeneous equalizing tank is not in the required condition and range of reaction, then needs to start soda acid add-on system and regulate, in addition, dissolved oxygen meter is used for the dissolved oxygen amount in detection reaction pond, ensure that dissolved oxygen amount is in certain scope, if dissolved oxygen amount is not in the required scope of reaction, then need to start gas blower and supplement air, improve dissolved oxygen amount, in addition, organic carbon detector and ammonia nitrogen tester are also installed in secondary denitrification pond, when the carbon-nitrogen ratio in sewage is lower than set(ting)value, carbon source add-on system adds carbon source from trend secondary denitrification pond, achieve automatization, PLC adjusts the running status of each pump automatically according to field instrument data, operator can observe pH value in wastewater treatment efficiency and equipment in each treating pond intuitively by indicating meter, dissolved oxygen amount, total organic carbon, the indexs such as ammonia nitrogen, really accomplish telemanagement, save the working time of workman, reduce labour intensity, apparatus and process flow process is simple in addition, efficiently, floor space is little, be convenient to the construction of factory building, cost of investment is low, production efficiency is high.
Further, sewage backflow pipe, mud return line all connect reflux pump, under meter and variable valve, reflux pump, under meter are all connected with PLC with variable valve.
PLC receives the data of under meter, carrys out adjust flux variable valve, thus achieves the quantity of reflux that automatically can adjust sewage or mud.Sewage backflow pump and sludge reflux pump be used for respectively making nitrated after phegma and sludge reflux to denitrification pond in participate in denitrification process further, the microorganism that sludge reflux makes full use of in mud participates in reaction, and phegma backflow mainly makes the abundant denitrogenation of sewage.
Further, in one-level denitrification pond, secondary denitrification pond and digester, elastic biological filler is all installed, and the specific surface area of elastic biological filler is greater than 150m
2/ m
3;
Wherein, also agitator is installed in one-level denitrification pond and secondary denitrification pond; Nitrification tank inner bottom part immobilized film head, aeration head connects gas blower, and gas blower, agitator are all connected with PLC.
In the technical program, the object of all installing elastic biological filler in one-level denitrification pond, secondary denitrification pond and digester is the biomass increasing nitrobacteria or denitrifying bacterium needed for biological denitrificaion in pond, improves nitric efficiency; In addition, the effect of agitator to be mainly used in ensureing between sewage and microorganism Homogeneous phase mixing and fully to contact, and improves the efficiency of microorganism nitrification and denitrification process.Install online dissolved oxygen meter in denitrification pond, PLC according to the rotating speed of the height adjustment agitator of dissolved oxygen concentration, can improve intellectuality and automatization, practical.
Additionally provide a kind of bio-denitrifying sewage treatment process in the embodiment of the present invention, this technique comprises the following steps:
S101, water quality regulation: in sewage, add acid-base reagent, adjust ph is 7-8;
S102, the process of one-level denitrification: the sewage after pH value regulates and nitrification tank phegma form mixed solution, denitrifying bacterium utilizes the organic carbon source in sewage to carry out denitrification process to the nitric nitrogen in nitrification tank phegma, and controlling dissolved oxygen in this process is 0.2-0.4mg/l;
S103, the process of secondary denitrification: in mixed solution, add organic carbon source, denitrifying bacterium utilizes organic carbon source thoroughly to remove nitric nitrogen in mixed solution;
S104, nitration treatment: mixed solution carries out nitration treatment, the ammonium oxidation in mixed solution is nitric nitrogen by nitrobacteria;
S105, mixed solution are partly refluxed in step S102 and carry out the process of one-level denitrification;
After mixed solution in S106, step S104 after process carries out mud-water separation by precipitation, clear water discharges.
In the technical program, this treatment process and prior art ratio, the present invention adopts Prepositive denitrification biological denitrificaion treatment process, make sewage through twice denitrification process, first time denitrification process is reacted by using the carbon source of itself in sewage, adds Additional carbon sources, directly carbon source is added denitrification pond with prior art in the process of second time denitrification, present invention reduces the usage quantity of carbon source, and improve nitric efficiency; The concentration simultaneously controlling dissolved oxygen in mixed solution is 0.5-1mg/l, pH value is 7.8-8.5, this parameter area can ensure the normal activity of aerobic microbiological and nitrobacteria, the conversion of nitrite to nitrate can be limited again, which reduce nitrite transform to nitrate needed for oxygen, and then reduce wind supply quantity, save energy consumption; In addition realized the automatic operation of equipment by the automatic control system of testing instrument and PLC, both improve nitric efficiency, and in turn simplify operation.Directly as industrial circulating water, reclaimed water, municipal landscape water etc., both can be administered water pollutions and again saved water resources by the sewage after process of the present invention.
Further, in step S101, acid-base reagent is the vitriol oil or sodium hydroxide solution.When the original water quality of sewage is acid, use sodium hydroxide solution, when the original water quality of sewage is alkalescence, use concentrated sulfuric acid solution.
Further, in step S104, the concentration controlling dissolved oxygen in mixed solution is 0.5-1mg/l, pH value is 7.8-8.5.This parameter area can ensure the normal activity of aerobic microbiological and nitrobacteria, can limit again the conversion of nitrite to nitrate, and the control of dissolved oxygen and pH value is all realized by the running status of PLC adjustment gas blower and soda acid add-on system.In nitration reaction process, by the amount of control ph and dissolved oxygen, nitrobacteria can be stoped to be nitrate by nitrite-oxidizing, thus save oxygen depletion, and then after phegma is back to denilrification system, shorten the time needed for denitrification, decrease carbon source required in denitrification process.
Further, in step S105, the reflux ratio of mixed solution is 300%-500%.Increase return sludge ratio when the ammonia nitrogen concentration in nitration treatment process raises, reduce return sludge ratio when the ammonia nitrogen concentration in nitration treatment process reduces.
Further, carry out the process of one-level denitrification in the sludge reflux in step S106 after mud-water separation to step S102, its reflux ratio is 50%-100%.This range of circulating flow can ensure that the mud in second pond is back to one-level denitrification pond in time, improves the efficiency of sewage backflow efficiency and water treatment.
Beneficial effect of the present invention is: in a kind of bio-denitrifying sewage treatment facility provided in the present invention, denilrification system is divided into one-level nitrification tank and secondary nitrification tank, and carbon source is added in secondary nitrification tank, one-level nitrification tank carries out anti-nitration reaction by using the carbon source of sewage own, the carbon source of sewage self is made full use of, and add carbon source in secondary nitrification tank and thoroughly remove nitrite nitrogen and nitric nitrogen, compared with prior art, the present invention is owing to taking full advantage of the carbon source contained by sewage self, so reduce the usage quantity of additional carbon in denitrification process, in addition, in the nitration treatment of sewage, by using the concentration of PLC control ph and dissolved oxygen, nitrobacteria can be suppressed to greatest extent to be nitrate by nitrite-oxidizing, thus save oxygen depletion, and then after phegma is back to denilrification system, time shorten needed for denitrification, and decrease carbon source required in denitrification process, so the biological denitrificaion treatment process undertaken by treatment facility provided by the invention, technological operation is simple, all important parameters all can regulate automatically, save the usage quantity of carbon source and oxygen, improve and denitrogenate efficiency, reduce Financial cost.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of bio-denitrifying sewage treatment facility described in the embodiment of the present invention;
Fig. 2 is the schema of a kind of bio-denitrifying sewage treatment process described in the embodiment of the present invention.
In figure:
1, homogeneous equalizing tank; 2, denilrification system; 201, one-level denitrification pond; 202, one-level denitrification pond; 3, nitrification tank; 4, second pond; 5, sewage backflow pipe; 6, mud return line; 7, soda acid add-on system; 701, acid-base solution pond; 8, carbon source add-on system; 801, carbon source pond; 9, PLC; 10, indicating meter; 11, pump of constant delivery type; 12, pH meter; 13, dissolved oxygen meter; 14, organic carbon detector; 15, ammonia nitrogen tester; 16, reflux pump; 17, under meter; 18, variable valve; 19, elastic biological filler; 20, agitator; 21, aeration head; 22, gas blower.
Embodiment
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
Embodiment 1, as shown in Figure 1, a kind of bio-denitrifying sewage treatment facility described in the embodiment of the present invention, the homogeneous equalizing tank 1 comprising monitoring device and connected successively by pipeline, denilrification system 2, nitrification tank 3 and second pond 4, nitrification tank is connected by sewage backflow pipe 5 with denilrification system, second pond is connected by mud return line 6 with denilrification system, it is characterized in that, homogeneous equalizing tank connects soda acid add-on system 7, denilrification system comprises the one-level denitrification pond 201 and secondary denitrification pond 202 that are connected successively by pipeline, pond connects carbon source add-on system 8 to secondary denitrification,
The indicating meter 10 that monitoring device comprises PLC 9, is connected with PLC, PLC is connected with soda acid add-on system, carbon source add-on system respectively.
For composite wastewater Treatment stations, incessantly a kind of owing to arranging the sewage come, and their water quality and quantity is regular change, is very important so arrange homogeneous equalizing tank.The effect of homogeneous equalizing tank is the ununiformity overcoming sewage discharge, the change of the water quality of well-balanced adjustment sewage, the water yield, water temperature, store surplus, supplement shortage, make the flooding quantity of biological treatment facility even, thus the impact of discordance on succeeding level-two biological treatment facility reducing sewage affect.In addition, sour water and alkaline sewage can also carry out neutralizing treatment mutually in equalizing tank.Homogeneous equalizing tank tool following points effect: (1) makes the factory of batch production when stopping producing, still can continue input sewage to biological treatment system, maintain biological treatment system and run continuously and stably; (2) improve the surge capability to organic loading, prevent the sharply change of biological treatment system organic loading; (3) homogeneous is carried out to water, prevent high density toxic substance from entering biological treatment system; (4) the fluctuating widely of control ph, reduces the consumption of acid or alkali in N-process; (5) avoid the flow rate fluctuation entering coagulation device, the automated operation of the processes such as adding of agent is carried out smoothly; (6) the do not carry out a biological disposal upon factory of field arranges homogeneous pond, can control the sewage discharge to municipal systems, to alleviate the change of sewage power load distributing.
Denilrification system is mainly used in participating in anti-nitration reaction, denilrification system in the present invention comprises one-level denitrification pond and secondary denitrification pond, carry out twice anti-nitration reaction by using one-level denitrification pond and secondary denitrification pond and thoroughly eliminate nitric nitrogen in sewage, in addition in denitrification process, only in secondary denitrification pond, add carbon source, reduce the usage quantity of carbon source, reduce Financial cost.
Nitrification tank is mainly used in participating in nitration reaction, Simultaneous Nitrification reaction phegma enter denitrification wash in system complete further anti-nitration reaction removing nitric nitrogen, participate in anti-nitration reaction in sludge reflux to denilrification system simultaneously, make full use of the microorganism in mud.
The present invention, by denilrification system being divided into one-level denitrification pond and secondary denitrification pond, completes twice denitrifying process, connects carbon source add-on system in secondary denitrification pond simultaneously, and the process of carbon source interpolation is automatically realized by PLC, improve water treatment efficiency, for water treatment improves good control condition, device structure provided by the invention is simple simultaneously, easy to operate, not only save flow of oxygen, and save carbon source, reduce energy consumption, reduce Financial cost, practical.
Embodiment 2, as shown in Figure 1, a kind of bio-denitrifying sewage treatment facility described in the embodiment of the present invention, the homogeneous equalizing tank, denilrification system, nitrification tank and the second pond that comprise monitoring device and connected successively by pipeline, nitrification tank is connected by sewage backflow pipe with denilrification system, second pond is connected by mud return line with denilrification system, homogeneous equalizing tank connects soda acid add-on system, denilrification system comprises the one-level denitrification pond and secondary denitrification pond that are connected successively by pipeline, and pond connects carbon source add-on system to secondary denitrification;
The indicating meter that monitoring device comprises PLC, is connected with PLC, PLC is connected with soda acid add-on system, carbon source add-on system respectively.
Further, carbon source add-on system comprises carbon source pond 801, and carbon source pond is connected with secondary denitrification pond by pump of constant delivery type 11; Soda acid add-on system comprises acid-base solution pond 701, and acid-base solution pond is connected with homogeneous equalizing tank by pump of constant delivery type, and pump of constant delivery type is connected with PLC.Further, in homogeneous equalizing tank, one-level denitrification pond, secondary denitrification pond and nitrification tank, pH meter 12 is all installed, in one-level denitrification pond, secondary denitrification pond and nitrification tank, dissolved oxygen meter 13 is also installed, wherein, organic carbon detector 14 and ammonia nitrogen tester 15 is also installed in secondary denitrification pond; PH meter, dissolved oxygen meter, organic carbon detector and ammonia nitrogen tester are all connected with PLC.Further, sewage backflow pipe, mud return line all connect reflux pump 16, under meter 17 and variable valve 18, reflux pump, under meter are all connected with PLC with variable valve.Further, in one-level denitrification pond, secondary denitrification pond and digester, elastic biological filler 19 is all installed, and the specific surface area of elastic biological filler is greater than 150m
2/ m
3; Wherein, also install agitator 20 in one-level denitrification pond and secondary denitrification pond, the effect of agitator to be mainly used in ensureing between sewage and microorganism Homogeneous phase mixing and fully to contact, and improves the efficiency of microorganism nitrification and denitrification process; Nitrification tank inner bottom part immobilized film head 21, aeration head connects gas blower 22, and gas blower provides oxygen required in equipment, and gas blower, agitator are all connected with PLC.
In the technical program, biological denitrificaion treatment facility structure provided by the invention is simple, provides the supervisory system of intelligence, detects each important parameter in good time, and be presented at display by in-line meter
On, operator just can judge the processing efficiency of sewage by observing display screen, PLC controls the running status of each pumps such as agitator, carbon source supply device, soda acid supply device, Root's blower automatically in addition.
In addition, all install elastic biological filler in one-level denitrification pond, secondary denitrification pond and digester, the object of installing elastic biological filler is the biomass increasing nitrobacteria or meal nitrobacteria needed for biological denitrificaion in pond, improves nitric efficiency.
Embodiment 3, as shown in Figure 2, under additionally providing a kind of sewage condition of low ratio of carbon to ammonium in the embodiment of the present invention, save the bio-denitrifying sewage treatment process of additional carbon and energy consumption, this technique comprises the following steps:
This technique comprises the following steps:
S101, water quality regulation: in sewage, add acid-base reagent, adjust ph is 7-8, and this pH value is the suitable living environment of microorganism;
S102, the process of one-level denitrification: the sewage after pH value regulates and nitrification tank phegma form mixed solution, denitrifying bacterium utilizes the organic carbon source in sewage to carry out denitrification process to the nitric nitrogen in nitrification tank phegma, controlling dissolved oxygen in this process is 0.2-0.4mg/l, and this dissolved oxygen scope can ensure most of microorganism denitrifying bacterium normal biological activity in sewage simultaneously;
S103, the process of secondary denitrification: in mixed solution, add organic carbon source, denitrifying bacterium utilizes organic carbon source thoroughly to remove nitric nitrogen in mixed solution, online total organic carbon instrument and online ammonia nitrogen instrument are installed in secondary denitrification pond, when total organic carbon and ammonia nitrogen ratio lower than 4 time, carbon source adder starts automatically, in secondary denitrification pond, add organic carbon source;
S104, nitration treatment: mixed solution carries out nitration treatment, the ammonium oxidation in mixed solution is nitric nitrogen by nitrobacteria;
S105, mixed solution are partly refluxed in step S102 and carry out the process of one-level denitrification;
After mixed solution in S106, step S104 after process carries out mud-water separation by precipitation, clear water discharges.
Further, in step S101, acid-base reagent is the vitriol oil or sodium hydroxide solution.When the original water quality of sewage is acid, use sodium hydroxide solution, when the original water quality of sewage is alkalescence, use concentrated sulfuric acid solution.
Further, in step S104, the concentration controlling dissolved oxygen in mixed solution is 0.5-1mg/l, pH value is 7.8-8.5.This parameter area can ensure the normal activity of aerobic microbiological and nitrobacteria, can limit again the conversion of nitrite to nitrate, and dissolved oxygen and pH control extremely is all realized by the running status of PLC adjustment gas blower and soda acid supply device.Carry out nitration treatment to the mixed solution after process in step S103, the ammonium oxidation in mixed solution is nitrite nitrogen by nitrobacteria.
Further, in step S105, the reflux ratio of mixed solution is 300%-500%.Increase return sludge ratio when the ammonia nitrogen concentration in nitration treatment process raises, reduce return sludge ratio when the ammonia nitrogen concentration in nitration treatment process reduces.
Further, carry out the process of one-level denitrification in the sludge reflux in step S106 after mud-water separation to step S102, its reflux ratio is 50%-100%.This range of circulating flow can ensure that the mud in second pond is back to one-level denitrification pond in time.
A kind of bio-denitrifying sewage treatment facility provided by the invention utilizes the concrete steps of aforesaid method as follows:
(1) first sewage flow into homogeneous pond, and in homogeneous pond, sewage carries out the adjustment of water quality and the water yield, and according to the character of sewage supplied materials, to add in the vitriol oil or sodium hydroxide adjustment pH value of sewage water to biological denitrification process in denitrifying tolerance band;
(2) in homogeneous pond, sewage enters one-level denitrification pond and secondary denitrification pond by sewage pump in succession with constant flow.In one-level denitrification pond, first denitrifying bacterium utilizes a small amount of carbon source in sewage and the nitric nitrogen in nitrification tank phegma to carry out anti-nitration reaction, and be nitrogen by part nitrate-nitrogen reduction in mixed solution, this stage takes full advantage of the carbon source in sewage;
(3) in secondary denitrification pond, adding the carbon source as a supplement such as glucose or methyl alcohol by carbon source add-on system, proceeding anti-nitration reaction to not reacting nitric nitrogen thoroughly in one-level denitrification pond.Both improve nitric efficiency by two-stage denitrification process like this, took full advantage of again the organic carbon source in sewage, reduce the consumption of additional carbon; In one-level denitrification pond and secondary denitrification pond, all need to control in pond that pH value is between 7--8, control DO is between 0.2--0.4mg/l.In one-level denitrification pond and secondary denitrification pond, all stirrer or submersible agitator are installed, ensure the mixing of sewage and microorganism and contact.
(4) sewage that secondary nitrification tank flows out enters nitrification tank, is nitrite nitrogen or nitric nitrogen by the ammonium oxidation in sewage under the effect of sewage nitrobacteria in nitrification tank.Dissolved oxygen in control nitrification tank is between 0.5--1mg/l, and control pH, between 7.8--8.5, meets short distance nitration condition, is nitrite nitrogen by ammonium oxidation.So both saved and nitrite nitrogen had been oxidized to oxygen required for nitric nitrogen and oxygen supply energy consumption, can save the carbon source of nitrate-nitrogen reduction required for nitrite nitrogen in the denitrification stage again.
(5) nitrification tank water outlet enters second pond, and sewage carries out mud-water separation at second pond, and oettIed sewage discharges, and the mud in settling tank enters one-level denitrification pond by sludge reflux pump reflux.
Tested as follows by the bio-denitrifying sewage treatment facility using invention to provide:
Contrast experiment 1: certain pharmaceutical factory's bio-denitrifying sewage process transformation project, raw waste water BOD
5average out to 800mg/l, T-N average out to 240mg/l, process water outlet total nitrogen is not up to standard, and methanol consumption amount is 400kg every day, and wind supply quantity is 3800m
3/ h.
When using sewage disposal device provided by the invention and process operations, first sewage and phegma enter one-level denitrification pond, denitrogenation is carried out in one-level denitrification pond, then enter secondary denitrification pond, add organic carbon source in secondary denitrification pond, and the pH value controlled in denitrification pond is 7, dissolved oxygen DO value is 0.2mg/l, control the DO value 0.5mg/l of nitrification tank, pH value 7.8, control nitrification tank internal reflux ratio is 300% simultaneously, second pond return sludge ratio is 50%.
By implementing above-mentioned technique, process water outlet can stably reaching standard, BOD
5average 50mg/l, T-N average out to 20mg/l, compared with before project reconstruction, the consumption of organic carbon source methyl alcohol is 310kg, and wind supply quantity is 3400m
3/ h, saves the additional carbon of 20% and the oxygen-supplying amount of 10%.
Contrast experiment 2: certain industrial production bio-denitrifying sewage process transformation project, raw waste water BOD
5average out to 600mg/l, T-N average out to 400mg/l.
When using sewage disposal device provided by the invention and process operations, first sewage and phegma enter one-level denitrification pond, denitrogenation is carried out in one-level denitrification pond, then enter secondary denitrification pond, and add glucose in secondary denitrification pond, and the pH value controlled in denitrification pond is 7.5, dissolved oxygen DO value is 0.3mg/l, control the DO value 0.8mg/l of nitrification tank, pH value 8.1, control nitrification tank internal reflux ratio is 400% simultaneously, second pond return sludge ratio is 80%.
By implementing above-mentioned technique, ensureing sewage qualified discharge, simultaneously compared with before transformation, saving the additional carbon of 23% and the oxygen-supplying amount of 12%.
Contrast experiment 3: certain alcohol manufactures Sewage Treatment Project transformation, carries out biological denitrificaion after anaerobic digestion, before sewage disposal, and its BOD
5average out to 500mg/l, T-N average out to 700mg/l.
For above-mentioned water quality situation, treatment facility of the present invention is adopted to operate according to technical process provided by the invention, sewage enters one-level denitrification pond, secondary denitrification pond, nitrification tank successively, second pond, at the bottom of one-level denitrification pond, pond, secondary denitrification pond, the on-line monitoring instrument such as agitator and pH, dissolved oxygen, ammonia nitrogen, total organic carbon is installed, specific surface area is all installed at 150m in denitrification pond and nitrification tank
2/ m
3elastic biological filler.Control internal reflux reflux ratio 500%, controlling return sludge ratio is 100%, controlling denitrification pond pH value is 8, dissolved oxygen content is 0.4mg/l, control nitrification tank pH value 8.5, dissolved oxygen DO is between 1mg/l, add methyl alcohol as organic carbon source to secondary denitrification pond, methyl alcohol is by carbon source add-on system automatic feeding.
By said process and method, biological denitrificaion water outlet BOD
5average out to 30mg/l, T-N average out to 25mg/l, compared with before project reconstruction, saves the additional carbon of 25% and the oxygen-supplying amount of 15%.
The present invention relates to one at low C/N than under sewage condition, save the biological denitrificaion treatment process of additional carbon and energy consumption, mainly solve at low C/N than under condition, existing Prepositive denitrification biological denitrification method needs the problem of a large amount of additional carbon and greater energy consumption, mainly comprises the following steps: (1) sewage carries out the adjustment of water quality and quantity and pH in homogeneous pond; (2) traditional single denitrification pond is divided into one-level denitrification pond and the secondary denitrification pond of two series connection, adds carbon source in secondary denitrification pond; (3) control the indexs such as pH, DO of nitrification tank in the optimum range of short distance nitration, stop nitrobacteria to be nitrate by nitrite-oxidizing, thus save oxygen supply energy consumption and the carbon source amount needed for denitrification; (4) in one-level denitrification pond and secondary denitrification pond, submersible agitator is installed, ensures that sewage contacts with the mixing of biological sludge; (5) in denitrification pond and nitrification tank, elastic biological filler is all installed, to increase quantity and the concentration of denitrification organisms, improves biological denitrificaion efficiency; (6) control of the key index such as pH, DO all adopts PLC automatically to control.
For the biological denitrification process of low carbon-nitrogen ratio sewage, major embodiment of the present invention goes out following technical characterstic: in denitrification processing links, denitrification pond is divided into one-level denitrification pond and secondary denitrification pond, in secondary denitrification pond, adds carbon source, compared with prior art, carbon source dosage is saved; 2) in nitration treatment link, control ph and dissolved oxygen DO, under short distance nitration condition, had both reduced oxygen supply energy consumption, save carbon source again create condition for denitrification; 3) at nitrification tank and denitrification pond, the larger 3 D elastic filler of specific surface area is all installed, to improve denitrification organisms amount and nitric efficiency.The carbon source dosage of more than 20% can be reduced, the oxygen supply energy consumption of 10% can be saved simultaneously.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a bio-denitrifying sewage treatment facility, the homogeneous equalizing tank (1) comprising monitoring device and connected successively by pipeline, denilrification system (2), nitrification tank (3) and second pond (4), nitrification tank is connected by sewage backflow pipe (5) with denilrification system, second pond is connected by mud return line (6) with denilrification system, it is characterized in that, homogeneous equalizing tank connects soda acid add-on system (7), denilrification system comprises the one-level denitrification pond (201) and secondary denitrification pond (202) that are connected successively by pipeline, secondary denitrification pond connects carbon source add-on system (8), the indicating meter (10) that monitoring device comprises PLC (9), is connected with PLC, PLC is connected with soda acid add-on system, carbon source add-on system respectively.
2. bio-denitrifying sewage treatment facility according to claim 1, is characterized in that, carbon source add-on system comprises carbon source pond (801), and carbon source pond is connected with secondary denitrification pond by pump of constant delivery type (11); Soda acid add-on system comprises acid-base solution pond (701), and acid-base solution pond is connected with homogeneous equalizing tank by pump of constant delivery type, and pump of constant delivery type is connected with PLC.
3. bio-denitrifying sewage treatment facility according to claim 1, it is characterized in that, in homogeneous equalizing tank, one-level denitrification pond, secondary denitrification pond and nitrification tank, pH meter (12) is all installed, dissolved oxygen meter (13) is also installed in one-level denitrification pond, secondary denitrification pond and nitrification tank
Wherein, organic carbon detector (14) and ammonia nitrogen tester (15) are also installed in secondary denitrification pond; PH meter, dissolved oxygen meter, organic carbon detector and ammonia nitrogen tester are all connected with PLC.
4. bio-denitrifying sewage treatment facility according to claim 1, it is characterized in that, sewage backflow pipe, mud return line all connect reflux pump (16), under meter (17) and variable valve (18), reflux pump, under meter are all connected with PLC with variable valve.
5. bio-denitrifying sewage treatment facility according to claim 1, is characterized in that, all install elastic biological filler (19), and the specific surface area of elastic biological filler is greater than 150m in one-level denitrification pond, secondary denitrification pond and digester
2/ m
3;
Wherein, in one-level denitrification pond and secondary denitrification pond, agitator (20) is also installed; Nitrification tank inner bottom part immobilized film head (21), aeration head connects gas blower (22), and gas blower, agitator are all connected with PLC.
6. a bio-denitrifying sewage treatment process, is characterized in that, this technique comprises the following steps:
S101, water quality regulation: in sewage, add acid-base reagent, adjust ph is 7-8;
S102, the process of one-level denitrification: the sewage after pH value regulates and nitrification tank phegma form mixed solution, denitrifying bacterium utilizes the organic carbon source in sewage to carry out denitrification process to the nitric nitrogen in nitrification tank phegma, and controlling dissolved oxygen in this process is 0.2-0.4mg/l;
S103, the process of secondary denitrification: in mixed solution, add organic carbon source, denitrifying bacterium utilizes organic carbon source thoroughly to remove nitric nitrogen in mixed solution;
S104, nitration treatment: mixed solution carries out nitration treatment, the ammonium oxidation in mixed solution is nitric nitrogen by nitrobacteria;
S105, mixed solution are partly refluxed in step S102 and carry out the process of one-level denitrification;
After mixed solution in S106, step S104 after process carries out mud-water separation by precipitation, clear water discharges.
7. bio-denitrifying sewage treatment process according to claim 6, is characterized in that, in step S101, acid-base reagent is the vitriol oil or sodium hydroxide solution.
8. bio-denitrifying sewage treatment process according to claim 6, is characterized in that, in step S104, the concentration controlling dissolved oxygen in mixed solution is 0.5-1mg/l, pH value is 7.8-8.5.
9. bio-denitrifying sewage treatment process according to claim 6, is characterized in that, in step S105, the reflux ratio of mixed solution is 300%-500%.
10. bio-denitrifying sewage treatment process according to claim 6, is characterized in that, carries out the process of one-level denitrification in the sludge reflux in step S106 after mud-water separation to step S102, and its reflux ratio is 50%-100%.
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Application publication date: 20150429 |