CN105236564A - Combined packing for biological aerated filter and application of combined packing - Google Patents

Combined packing for biological aerated filter and application of combined packing Download PDF

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Publication number
CN105236564A
CN105236564A CN201510727411.5A CN201510727411A CN105236564A CN 105236564 A CN105236564 A CN 105236564A CN 201510727411 A CN201510727411 A CN 201510727411A CN 105236564 A CN105236564 A CN 105236564A
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baf
cod
zeolite
biofilm
nut
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CN105236564B (en
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丁绍兰
谢林花
封香香
齐泽宁
杨倩
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention discloses combined packing for a biological aerated filter. The combined packing is composed of walnut shells and zeolite in a volume ratio of (2-4) : 1. The invention further discloses an application of the combined packing in the biological aerated filter. The combined packing for the biological aerated filter disclosed by the invention is fast in biofilm culturing speed in a same condition compared with other packing. The walnut shells and the zeolite are combined as the combined packing for the biological aerated filter, and therefore, the porosity, the adsorbability, the ion-exchange property and a relatively strong supporting effect of the zeolite are exerted; and the walnut shells are used as a solid carbon source so that no additional carbon source is needed, and the walnut shells further have a certain framework supporting effect, so that the combined packing is not prone to blockage. In addition, the walnut shells as an agricultural solid waste are wide in source and low in price.

Description

A kind of BAF combined stuffing and application
Technical field
The invention belongs to water-treatment technology field, be specifically related to a kind of BAF combined stuffing, the invention still further relates to the application of this combined stuffing in BAF.
Background technology
In recent years, because human living standard improves, and the reason such as the excessive use of agrochemical, a large amount of nitrogenous sanitary sewages and trade effluent enter water body, nitrogen is the principal element causing body eutrophication, and can be converted into the health of " three cause " material nitrite and the serious threat mankind.Therefore research and develop economy, efficiently denitrogenation of waste water treatment technology, become emphasis and the focus in Water Pollution Control Engineering field.In numerous denitride technologies, BAF (BAF) integrates bio-oxidation and retains suspended solids, eliminate follow-up secondary sedimentation basins, under the prerequisite ensureing treatment effect, treatment process is simplified, there is floor space few, processing efficiency is high, and effluent quality is good, is convenient to the advantages such as control automatically.Especially in recent years focus is become to the research of the nitrification and denitrification function of this reactor.
Filler is as microorganism carrier, it is the place that microorganism perches, breeds, play a part again to retain suspended matter in operational process simultaneously, it is one of core of BAF treatment technology, its material composition and surface property will directly affect the attachment of filling surface microorganism, growth, breeding and activity, and then affect microorganism colonization performance and contaminant degradation efficiency.The microbial film that different fillers is formed is different, and different biofilm states causes microbial ecological in system to occur difference, can have a huge impact the processing efficiency of reactor.
Natural silicate minerals filler and the compounded mix etc. by multiple filler combination such as spherical light porous biological potsherd filling, zeolite that the more aerating biological filter pool filler of current research mainly contains gac, fires for main raw material with flyash and clay.Gac is as filler, expensive, and in gac BAF, gas and the agitaion of the aqueous solution to gac make activated carbon bio-filter water outlet color burn and cause its delivery turbidity to increase, and are even greater than into water turbidity; Zeolite is as aerating biological filter pool filler, and due to its out-of-shape, flow resistance is large, and easily block, water distribution, gas distribution are not easily even.Zeolite surface with negative charge, separately as the biofilm formation growth being unfavorable for microorganism during aerating biological filter pool filler; Nut-shell is long as the biofilm time needed for aerating biological filter pool filler, and due to microbial decomposition cause long-play after filled column subside.Therefore, work out cheapness, wide material sources and efficiently bio-filter stuffing be required.
Summary of the invention
The object of this invention is to provide a kind of BAF combined stuffing, this combined stuffing biofilm speed is fast, and under optimum operation processing parameter, nitrogen removal performance is good, and wide material sources, price is inexpensive.
Another object of the present invention is to provide the application of a kind of aforesaid combination filler in BAF.
The technical solution adopted in the present invention is, a kind of BAF combined stuffing, is made up of nut-shell and zeolite, and wherein the volume ratio of nut-shell and zeolite is 2 ~ 4:1.
Feature of the present invention is also,
The median size of nut-shell and zeolite is 4 ~ 6mm.
Another technical scheme of the present invention is, the application of aforesaid combination filler in BAF, specifically implements according to following steps
Step 1, the static biofilm stage
Be nut-shell and the zeolite of 4 ~ 6mm by median size be that 2 ~ 4:1 mixes rear loading BAF by volume, and active sludge is injected in filter tank and carry out stewing exposing to the sun, make mud activity recovery, mud dosage is as the criterion to fill filter tank, intakes after seed sludge with the little water yield, and passes into air and carry out aeration agitation, every 24 hours by filter tank 1/3 upper solution take out, and supplement simulated wastewater, every day, periodic monitor reactor effluent quality, namely monitored pH, DO, COD and NH 4 +-N, and examine under a microscope microbial growth situation on filler; The cultured continuously stage is entered into after 7 days;
Step 2, the cultured continuously stage
Discharge and fail the suspension microorganism of effective biofilm, pass into air with simulated wastewater continuum micromeehanics, the hydraulic detention time keeping biological filter is 12h, keep dissolved oxygen concentration at 4mg/L during biofilm, under the prerequisite that dissolved oxygen concentration meets the demands, reduce aeration rate, timing every day detection reaction device effluent quality, namely monitors pH, DO, COD and NH as far as possible 4 +-N, and observe microbial growth situation on filler; If effluent quality fluctuation is less, COD and NH 4 +-N clearance tends towards stability, and to can be observed in water outlet containing more campanularian under the microscope, illustrates to cultivate through domestication after a while, and microbial film has been formed and growth and maturity just gradually, has stronger anti-load impact ability, determines biofilm success;
Step 3, the BAF operation phase
After biofilm success, pH value 7.5 ~ 8.5, inlet COD concentration are 300mg/L, NH 4 +-N concentration is run under 30mg/L condition, and every day, periodic monitor reactor effluent quality, namely monitored pH, dissolved oxygen, COD, NH 4 +-N, NO 2 --N and NO 3 --N water-quality guideline.
Feature of the present invention is also,
In step 1, aeration rate is 9L/h, adopts intermittent aeration, leaves standstill 1h with culturing micro-organisms after aeration 3h.
In step 3, aeration rate is 9 ~ 12L/h, hydraulic load 0.03 ~ 0.06m 3/ (m 2h), gas-water ratio is 3 ~ 12:1.
The invention has the beneficial effects as follows, BAF combined stuffing of the present invention, they are compared with other fillers, and under equal conditions, biofilm speed is fast; Nut-shell and combination of zeolites rise and are used as aerating biological filter pool filler, the porousness of zeolite, adsorptivity, ion-exchange performance and stronger supporting role can not only be played, and utilize nut-shell as solid carbon source, without additional carbon, nut-shell also has certain skeletal support effect, not easily blocks.In addition, nut-shell is as a kind of agricultural solid residue, wide material sources, cheap.
Accompanying drawing explanation
Fig. 1 is start-up period COD change curve;
Fig. 2 is start-up period NH4 +-N change curve;
Fig. 3 is the influence curve of BAF operation phase hydraulic load;
Fig. 4 is the influence curve of BAF operation phase gas-water ratio.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
A kind of BAF combined stuffing of the present invention, be made up of nut-shell and zeolite, wherein the volume ratio of nut-shell and zeolite is 2 ~ 4:1.
The median size of nut-shell and zeolite is 4 ~ 6mm.
The application of aforesaid combination filler in BAF, specifically implement according to following steps:
Step 1, the static biofilm stage
Be nut-shell and the zeolite of 4 ~ 6mm by median size be that 2 ~ 4:1 mixes rear loading BAF by volume, and active sludge is injected in filter tank and carry out stewing exposing to the sun, make mud activity recovery, mud dosage is as the criterion to fill filter tank, intake with the little water yield after seed sludge, and pass into air and carry out aeration agitation, aeration rate is 9L/h, adopt intermittent aeration, leave standstill 1h after aeration 3h with culturing micro-organisms, the microorganism that on filler, adhesion property is good can fully be grown, adheres to also fixed growth on filling carrier; Every 24 hours by filter tank 1/3 upper solution take out, and supplement simulated wastewater, every day, periodic monitor reactor effluent quality, namely monitored pH, DO, COD and NH 4 +-N, and examine under a microscope microbial growth situation on filler; The cultured continuously stage is entered into after 7 days;
Step 2, the cultured continuously stage
Discharge and fail the suspension microorganism of effective biofilm, pass into air with simulated wastewater continuum micromeehanics, the hydraulic detention time keeping biological filter is 12h, keep dissolved oxygen concentration at 4mg/L during biofilm, under the prerequisite that dissolved oxygen concentration meets the demands, reduce aeration rate as far as possible, so not only can reduce and filter material surface is washed away, also help attachment and the growth of microorganism, timing every day detection reaction device effluent quality, namely monitors pH, DO, COD and NH 4 +-N, and observe microbial growth situation on filler; If effluent quality fluctuation is less, COD and NH 4 +-N clearance tends towards stability, and to can be observed in water outlet containing more campanularian under the microscope, illustrates to cultivate through domestication after a while, and microbial film has been formed and growth and maturity just gradually, has stronger anti-load impact ability, determines biofilm success;
Step 3, the BAF operation phase
After biofilm success, pH value 7.5 ~ 8.5, inlet COD concentration are 300mg/L, NH 4 +-N concentration is 30mg/L, aeration rate is 9 ~ 12L/h, hydraulic load 0.03 ~ 0.06m 3/ (m 2h), gas-water ratio is run under 3 ~ 12:1 condition, and every day, periodic monitor reactor effluent quality, namely monitored pH, dissolved oxygen, COD, NH 4 +-N, NO 2 --N and NO 3 --N water-quality guideline.
Embodiment 1
By nut-shell and zeolite by volume for being applied in BAF after 3:1 mixing.
1. BAF start-up operating performance
(1) start-up period COD concentration and clearance thereof
As can be seen from Figure 1, BAF is during start-up, and at the continuum micromeehanics initial stage, COD clearance is about 60%, and when successive reaction proceeds to the 5th day, COD clearance has brought up to rapidly 90% by 61.5% of the day before yesterday.When entering organic matter of water concentration (COD) is within the scope of 218.4mg/L ~ 353.9mg/L, COD all maintains higher clearance (61.5% ~ 94%).It can also be seen that, except indivedual skies Special Circumstances, COD clearance is overall in rising trend in time, and phase upon actuation, even if inlet COD concentration fluctuation is comparatively large, but it also has higher clearance.This illustrates cultivates through domestication after a while, and microbial film has been formed and growth and maturity just gradually.And due to the specific surface area of Discussion of Biological Aerated Filter Medium large, make biomass in its per surface area high, can show stronger surge capability when larger change appears in applied load, the anti-load impact ability of reactor is stronger.
(2) NH between the starting period 4 +-N concentration and clearance thereof
As shown in Figure 2: the continuum micromeehanics initial stage, ammonia nitrogen removal frank increases comparatively fast in time, within two days, ammonia nitrogen removal frank has brought up to 85.96% by 73.7%, then when influent ammonium concentration changes within the scope of 35.4mg/L ~ 53.5mg/L, ammonia nitrogen removal frank all remains on more than 60%, can reach 86.5%.
Equally with organic removal also occur obvious fluctuation, on the whole BAF has good removal effect to ammonia nitrogen.Can also see that, when influent ammonium concentration remains on 50 ± 3mg/L, water outlet ammonia nitrogen is all at about 10mg/L.At the 20th day to the 26th day, influent ammonium concentration changed greatly, but ammonia nitrogen removal frank is more stable, and in 74.4% ~ 79.7% scope, this illustrates the domestication cultivation through after a while, and microbial film has formed growth and maturity gradually, has certain capacity of resisting impact load.
2. BAF startup optimization microscopy result
In initial start stage, reactor fluctuation of service, effluent quality is poor, and can be observed under the microscope has the microorganisms such as paramecium, wheel animalcule, tired branch worm in water outlet, and paramecium represents that system loading is low, and dissolved oxygen is low; Along with the operation of reactor, can be observed have a large amount of campanularian to exist in water outlet, the front end peristoma of its polypide has ciliated band (enclosing by two cilium that can stir to form), and polypide is typical bell-shaped, therefore claims campanularian, belongs to protozoon.No matter be single or the kind of colony, grow very abundant in the aeration tank and filter tank of biological wastewater treatment factory, the flocculation reaction of active sludge can be promoted, and can free bacteria be preyed in a large number and use clarification of water.Occurring in a large number of campanularian is the performance of Activated Sludge Growth maturation, represents that treatment effect is good.
3. the optimization of BAF operating parameter
(1) hydraulic load
Be 300mg/L, NH4 at pH value 7.5 ~ 8.5, inlet COD concentration +-N concentration is under the operational conditions of 30mg/L.Hydraulic load is from 0.03m 3/ (m 2h) 0.06m is changed to 3/ (m 2h) to COD, NH4 time +-N clearance affect situation.The impact of hydraulic load as shown in Figure 3.
As seen from Figure 3, COD clearance and ammonia nitrogen removal frank all first raise with the increase of hydraulic load and then reduce.When hydraulic load is by 0.03m 3/ (m 2h) 0.04m is risen to 3/ (m 2h) time, COD average removal rate is increased to 83.16% by 56.20%, when hydraulic load continues to be increased to 0.06m 3/ (m 2h), time, declining appears again in COD average removal rate, be reduced to 74%, therefore water conservancy load is 0.04m 3/ (m 2h), time), COD clearance is the highest.Equally, NH 4 +-N clearance is also with hydraulic load 0.04m 3/ (m 2h) maximum time, now, ammonia nitrogen removal frank is 81.26%, when hydraulic load is reduced to 0.03m 3/ (m 2or be increased to 0.06m h) 3/ (m 2h) ammonia nitrogen removal frank is reduced to 72.50% and 75.01% respectively.
Result shows: when ensureing enough hydraulic detention times, BAF has certain anti-hydraulic loading shock ability, when hydraulic load value is 0.03 ~ 0.06m 3/ (m 2h), time), BAF reactor can ensure higher organism, ammonia nitrogen removal frank level.
When hydraulic load is less than or greater than 0.03 ~ 0.06m 3/ (m 2h), time), COD clearance and ammonia nitrogen removal frank decline all to some extent.Because keep certain gas-water ratio, hydraulic load is too high, and the contact reacts time decreased of microorganism and substrate, is unfavorable for the removal of pollutent; Meanwhile, higher filtering velocity also increases Flow Velocity and hydraulic shear excessively between filtering layer, makes microbial film more easily by wash-out, thus the removal efficiency of pollutent is declined.And increase hydraulic load means reduction hydraulic detention time (HRT) simultaneously, grow slower nitrobacteria nitrite bacteria by with the competition of carbonization heterotrophic bacterium in be in disadvantageous status, general activity declines, thus reduces the nitrification ability of whole reactor.
(2) gas-water ratio
PH be 7.5 ~ 8.5, hydraulic load is 0.04m 3/ (m 2h), inlet COD concentration is 300mg/L, NH 4 +-N concentration is under the operational conditions of 30mg/L, to COD, NH when gas-water ratio is respectively 3:1,6:1,12:1 4 +the impact of-N clearance, the impact of different gas-water ratio the results are shown in Figure shown in 4.
As seen from Figure 4, with the increase gradually of gas-water ratio, BAF is to COD, NH 4 +the removal ability of-N also increases gradually.When gas-water ratio brings up to 6:1 by 3:1, COD, NH 4 +the clearance of-N is increased to 79.85%, 80.6% by 66.71%, 76.17% respectively, increases relatively obvious.When gas-water ratio brings up to 12:1 by 6:1, COD, NH 4 +the clearance increase of-N is not obvious, and COD clearance increased value is less than 1%.
Result shows: BAF has higher oxygen and utilizes and conversion capability.Can obtain good oxidation effect when gas-water ratio 6:1, aerobic bacteria can well be grown, and reactor shows stable treatment effect.Along with the increase of aeration rate, liquid less turbulence that air bubbling causes increases, and to be conducive in gas phase oxygen in water and the transmission of filling surface, in reaction system, the concentration of oxygen improves, for aerobic microbiological provides sufficient oxygen, therefore pollutants removal rate increases with aeration rate and improves.If but aeration rate is excessive, in reaction system, the concentration of oxygen is subject to the restriction of equilibrium solubility, and dissolved oxygen does not only increase, and excessively strong turbulent flow causes biomembranous on the parsing of oxygen in water and filler coming off on the contrary, reduce the concentration of immobilized microorganism, be unfavorable for the removal of pollutent.And aeration rate is excessive also can increase power consumption.
Embodiment 2
Using nut-shell and zeolite by volume for 2:1 mixes as aerating biological filter pool filler, startup optimization according to the same manner as in Example 1, monitoring result shows now BAF success biofilm and needs 23 days, COD and NH 4 +the clearance of-N is respectively 73.3% ~ 87.5% and 63.2% ~ 77.4%.
Embodiment 3
Using nut-shell and zeolite by volume for 4:1 mixes as aerating biological filter pool filler, startup optimization according to the same manner as in Example 1, monitoring result shows, and now BAF success biofilm needs 27 days, COD and NH 4 +the clearance of-N can reach 71.8% ~ 89.6% and 65.1% ~ 80.6% respectively.
BAF combined stuffing of the present invention, they are compared with other fillers, and under equal conditions, biofilm speed is fast, and biofilm success approximately only needs more than 20 day; To pollutent (COD, NH 4 +-N) removal effect is good,
And filler is common agricultural waste, wide material sources, cheap, be applicable to a large amount of use.

Claims (5)

1. a BAF combined stuffing, is characterized in that, is made up of nut-shell and zeolite, and wherein the volume ratio of nut-shell and zeolite is 2 ~ 4:1.
2. BAF combined stuffing according to claim 1, is characterized in that, the median size of nut-shell and zeolite is 4 ~ 6mm.
3. the application of combined stuffing in BAF, is characterized in that, specifically implements according to following steps:
Step 1, the static biofilm stage
Be nut-shell and the zeolite of 4 ~ 6mm by median size be that 2 ~ 4:1 mixes rear loading BAF by volume, and active sludge is injected in filter tank and carry out stewing exposing to the sun, make mud activity recovery, mud dosage is as the criterion to fill filter tank, intakes after seed sludge with the little water yield, and passes into air and carry out aeration agitation, every 24 hours by filter tank 1/3 upper solution take out, and supplement simulated wastewater, every day, periodic monitor reactor effluent quality, namely monitored pH, DO, COD and NH 4 +-N, and examine under a microscope microbial growth situation on filler, enter into the cultured continuously stage after 7 days;
Step 2, the cultured continuously stage
Discharge and fail the suspension microorganism of effective biofilm, pass into air with simulated wastewater continuum micromeehanics, the hydraulic detention time keeping biological filter is 12h, keep dissolved oxygen concentration at 4mg/L during biofilm, under the prerequisite that dissolved oxygen concentration meets the demands, reduce aeration rate, timing every day detection reaction device effluent quality, namely monitors pH, DO, COD and NH as far as possible 4 +-N, and observe microbial growth situation on filler; If effluent quality fluctuation is less, COD and NH 4 +-N clearance tends towards stability, and to can be observed in water outlet containing more campanularian under the microscope, illustrates to cultivate through domestication after a while, and microbial film has been formed and growth and maturity just gradually, has stronger anti-load impact ability, determines biofilm success;
Step 3, the BAF operation phase
After biofilm success, pH value 7.5 ~ 8.5, inlet COD concentration are 300mg/L, NH 4 +-N concentration is run under 30mg/L condition, and every day, periodic monitor reactor effluent quality, namely monitored pH, dissolved oxygen, COD, NH 4 +-N, NO 2 --N and NO 3 --N water-quality guideline.
4. the application of combined stuffing according to claim 3 in BAF, is characterized in that, in step 1, aeration rate is 9L/h, adopts intermittent aeration, leaves standstill 1h with culturing micro-organisms after aeration 3h.
5. the application of combined stuffing according to claim 3 in BAF, is characterized in that, in step 3, aeration rate is 9 ~ 12L/h, hydraulic load 0.03 ~ 0.06m 3/ (m 2h), gas-water ratio is 3 ~ 12:1.
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CN108328737A (en) * 2017-11-30 2018-07-27 河海大学 A kind of Tiny ecosystem matrix, preparation method and its application based on artificial wet land reinforced processing breeding wastewater
CN109489568A (en) * 2018-09-30 2019-03-19 南京大学 A kind of auxiliary device and measuring method of on-line determination Wastewater treatment filling material biofilm thickness
CN109928492A (en) * 2019-04-18 2019-06-25 南京清元景和环境科技有限公司 The preparation method of modified activated carbon biologic packing material for biofilter

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