CN105236564B - A kind of BAF combined stuffing and application - Google Patents

A kind of BAF combined stuffing and application Download PDF

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Publication number
CN105236564B
CN105236564B CN201510727411.5A CN201510727411A CN105236564B CN 105236564 B CN105236564 B CN 105236564B CN 201510727411 A CN201510727411 A CN 201510727411A CN 105236564 B CN105236564 B CN 105236564B
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cod
baf
aeration
walnut shell
biofilm
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CN105236564A (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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    • 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 a kind of BAF combined stuffing, it is made up of walnut shell and zeolite, wherein the volume ratio of walnut shell and zeolite is 2~4:1.The invention also discloses application of the combined stuffing in BAF.BAF combined stuffing of the present invention, it is compared with other fillers, and biofilm speed is fast under equal conditions;Walnut shell and combination of zeolites, which rise, is used as aerating biological filter pool filler, porous, adsorptivity, ion-exchange performance and the stronger supporting role of zeolite can not only be played, and it is used as solid carbon source by the use of walnut shell, without additional carbon, walnut shell also there is certain skeletal support to act on, and be not susceptible to block.It is wide material sources, cheap in addition, walnut shell is as a kind of agricultural solid residue.

Description

A kind of BAF combined stuffing and application
Technical field
The invention belongs to water-treatment technology field, and in particular to a kind of BAF combined stuffing, the present invention also relate to And application of the combined stuffing in BAF.
Background technology
In recent years, because human living standard improves, and agrochemical excessively uses etc. reason, substantial amounts of nitrogenous life Sewage and industrial wastewater living are discharged into water body, and nitrogen is the principal element for causing body eutrophication, and can be converted into " three cause " thing Matter nitrite and the health of the serious threat mankind.Therefore economic, efficient denitrogenation of waste water treatment technology is researched and developed, it has also become The emphasis and focus in Water Pollution Control Engineering field.In numerous denitrogenation technologies, BAF (BAF) collection biological oxidation With retention suspended solid in one, follow-up secondary sedimentation tank is eliminated, makes handling process simple on the premise for the treatment of effect is ensured Change, have floor space few, treatment effeciency is high, and effluent quality is good, the advantages that being easy to automatically control.Especially in recent years to the reaction The research of the nitrification and denitrification function of device turns into focus.
Filler is the place that microorganism inhabites, bred, while play cut again in the process of running as microorganism carrier The effect of suspended material is stayed, is one of the core of BAF treatment technology, its material composition and surface property will be direct Attachment, growth, breeding and the activity of filler surface microorganism are influenceed, and then influences microorganism colonization performance and contaminant degradation effect Rate.The biomembrane that different fillers is formed is different, and different biofilm states cause microbial ecological in system difference occur, The treatment effeciency of reactor can be had a huge impact.
Study at present more aerating biological filter pool filler mainly active charcoal, burn by primary raw material of flyash and clay The spherical light porous biological potsherd filling of system, the natural silicate minerals filler such as zeolite and formed by a variety of filler combinations Compounded mix etc..Activated carbon is expensive as filler, and in activated carbon BAF gas and the aqueous solution to activity The agitaion of charcoal makes activated carbon bio-filter water outlet color burn and causes its delivery turbidity to increase, and is even greater than turbid into water Degree;For zeolite as aerating biological filter pool filler, because its is in irregular shape, resistance to water-flow is big, easily blocks, water distribution, gas distribution are not easy Uniformly.Zeolite surface carries negative electrical charge, is unfavorable for the biofilm formation growth of microorganism during separately as aerating biological filter pool filler;Walnut Shell is grown as the biofilm time needed for aerating biological filter pool filler, and because microorganism decomposition causes filled column after long-play Collapse.Therefore, it is required to work out cheap, wide material sources and efficient bio-filter stuffing.
The content of the invention
It is an object of the invention to provide a kind of BAF combined stuffing, and the combined stuffing biofilm speed is fast, most preferably Nitrogen removal performance is good under run parameter, and wide material sources, and price is inexpensive.
It is a further object to provide a kind of application of combinations thereof filler in BAF.
The technical solution adopted in the present invention is a kind of BAF combined stuffing, to be made up of walnut shell and zeolite, Wherein the volume ratio of walnut shell and zeolite is 2~4:1.
The features of the present invention also resides in,
The average grain diameter of walnut shell and zeolite is 4~6mm.
Another technical scheme of the present invention is application of the combinations thereof filler in BAF, tool Body is implemented according to following steps
Step 1, the static biofilm stage
It is 2~4 by volume by walnut shell and zeolite that average grain diameter is 4~6mm:1 it is well mixed after load aeration life Thing filter tank, and activated sludge is injected in filter tank and carry out stewing exposure, makes sludge activity recovery, sludge dosage using fill filter tank as Standard, intake with small water after seed sludge, and be passed through air and carry out aeration agitation, every 24 hours molten by filter tank 1/3 upper strata Liquid takes out, and supplements simulated wastewater, daily periodic monitor reactor effluent quality, that is, monitors pH, DO, COD and NH4 +- N, and The upgrowth situation of microorganism on micro- Microscopic observation filler;Continuous cultivation stage is entered after 7 days;
Step 2, continuous cultivation stage
Discharge fails the suspension microorganism of effective biofilm, with simulated wastewater continuum micromeehanics and is passed through air, keeps biological filter The hydraulic detention time in pond is 12h, dissolved oxygen concentration is kept during biofilm in 4mg/L, before dissolved oxygen concentration meets to require Put, reduce aeration quantity as far as possible, the reactor effluent quality of timing detection daily, that is, monitor pH, DO, COD and NH4 +- N, and observe The upgrowth situation of microorganism on filler;If effluent quality fluctuates smaller, COD and NH4 +- N clearances tend towards stability, under the microscope It can be observed to contain more campanularian in water outlet, illustrate through domestication culture after a while, biomembrane has been formed and just gradually life It is long ripe, there is stronger anti-load impact ability, determine biofilm success;
Step 3, the BAF operation phase
After biofilm success, pH value 7.5~8.5, inlet COD concentration 300mg/L, NH4 +Under the conditions of-N concentration is 30mg/L Operation, daily periodic monitor reactor effluent quality, that is, monitor pH, dissolved oxygen, COD, NH4 +-N、NO2 -- N and NO3 -- N water quality refers to Mark.
The features of the present invention also resides in,
Aeration quantity is 9L/h in step 1, and using intermittent aeration, 1h is stood to cultivate microorganism after being aerated 3h.
Aeration quantity is 9~12L/h, 0.03~0.06m of hydraulic load in step 33/(m2H), gas-water ratio is 3~12:1.
The invention has the advantages that BAF combined stuffing of the present invention, it is compared with other fillers, equal bar Biofilm speed is fast under part;Walnut shell and combination of zeolites, which rise, is used as aerating biological filter pool filler, can not only play the more of zeolite Permeability, adsorptivity, ion-exchange performance and stronger supporting role, and by the use of walnut shell as solid carbon source, without outer Add carbon source, walnut shell also there is certain skeletal support to act on, be not susceptible to block.In addition, walnut shell is as a kind of agricultural solid Body discarded object, it is wide material sources, cheap.
Brief description of the drawings
COD change curves during Fig. 1 is start-up;
NH4 during Fig. 2 is start-up+- N change curves;
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
The present invention is described in detail with reference to the accompanying drawings and detailed description.
A kind of BAF combined stuffing of the present invention, be made up of walnut shell and zeolite, wherein walnut shell and zeolite Volume ratio is 2~4:1.
The average grain diameter of walnut shell and zeolite is 4~6mm.
Application of the combinations thereof filler in BAF, specifically implements according to following steps:
Step 1, the static biofilm stage
It is 2~4 by volume by walnut shell and zeolite that average grain diameter is 4~6mm:1 it is well mixed after load aeration life Thing filter tank, and activated sludge is injected in filter tank and carry out stewing exposure, makes sludge activity recovery, sludge dosage using fill filter tank as Standard, intake with small water after seed sludge, and be passed through air and carry out aeration agitation, aeration quantity 9L/h, using intermittent aeration, 1h is stood to cultivate microorganism after aeration 3h so that the good microorganism of adhesion property can fully grow, adhere to and fix on filler It is grown on filling carrier;In filter tank 1/3 upper solution is taken out, and supplements simulated wastewater within every 24 hours, timing daily is supervised Reactor effluent quality is surveyed, that is, monitors pH, DO, COD and NH4 +- N, and the growth shape of microorganism on filler is observed under the microscope Condition;Continuous cultivation stage is entered after 7 days;
Step 2, continuous cultivation stage
Discharge fails the suspension microorganism of effective biofilm, with simulated wastewater continuum micromeehanics and is passed through air, keeps biological filter The hydraulic detention time in pond is 12h, dissolved oxygen concentration is kept during biofilm in 4mg/L, before dissolved oxygen concentration meets to require Put, reduce aeration quantity as far as possible, so can not only reduce and filter material surface is washed away, also help the attachment and life of microorganism It is long, the reactor effluent quality of timing detection daily, that is, monitor pH, DO, COD and NH4 +- N, and observe the life of microorganism on filler Long situation;If effluent quality fluctuates smaller, COD and NH4 +- N clearances tend towards stability, and can be observed to contain in water outlet under the microscope There is more campanularian, illustrate that, through domestication culture after a while, biomembrane has formed and has just been grown into maturation, there is stronger resist Load impact ability, determine biofilm success;
Step 3, the BAF operation phase
After biofilm success, pH value 7.5~8.5, inlet COD concentration 300mg/L, NH4 +- N concentration is 30mg/L, aeration quantity For 9~12L/h, 0.03~0.06m of hydraulic load3/(m2H), gas-water ratio is 3~12:Run under the conditions of 1, daily periodic monitor Reactor effluent quality, that is, monitor pH, dissolved oxygen, COD, NH4 +-N、NO2 -- N and NO3 -- N water quality index.
Embodiment 1
It is 3 by volume by walnut shell and zeolite:It is applied to after 1 mixing in BAF.
1. BAF start-up operational effect
(1) COD concentration and its clearance during start-up
From figure 1 it appears that BAF is during start-up, continuum micromeehanics initial stages, COD clearances are 60% or so, when successive reaction proceeds to the 5th day, COD clearances have brought up to 90% rapidly by the 61.5% of the previous day.Enter COD maintains higher clearance (61.5% when water organic concentration (COD) is in the range of 218.4mg/L~353.9mg/L ~94%).It can also be seen that in addition to indivedual days special circumstances, COD clearances are overall in rising trend with the time, and are starting In the later stage, even if inlet COD concentration fluctuation is larger, but it also has higher clearance.This explanation is through domestication after a while Culture, biomembrane have formed and have just been grown into maturation.And because the specific surface area of Discussion of Biological Aerated Filter Medium is big, make its list Biomass is high on bit surface area, and stronger buffer capacity can be shown when applied load varies widely, and reactor resists Load impact ability is stronger.
(2) NH during starting4 +- N concentration and its clearance
As shown in Figure 2:Continuum micromeehanics initial stages, ammonia nitrogen removal frank increase with the time it is very fast, within two days, ammonia nitrogen removal frank by 73.7% has brought up to 85.96%, then when influent ammonium concentration changes in the range of 35.4mg/L~53.5mg/L, ammonia nitrogen Clearance is held at more than 60%, can reach 86.5%.
With also occurring obvious fluctuation as the removal of organic matter, on the whole BAF has very well to ammonia nitrogen Removal effect.It can also be seen that when influent ammonium concentration is maintained at 50 ± 3mg/L, water outlet ammonia nitrogen is in 10mg/L or so. At the 20th day to the 26th day, influent ammonium concentration changed greatly, but ammonia nitrogen removal frank is relatively stable, in 74.4%~79.7% scope Interior, for this explanation through domestication culture after a while, biomembrane, which has been formed, is grown into maturation, there is certain anti-shock loading energy Power.
2. BAF startup optimization microscopy result
In initial start stage, reactor fluctuation of service, effluent quality is poor, can be observed have grass in water outlet under the microscope The microorganisms such as worm, wheel animalcule, tired branch worm are carried out, paramecium represents that system loading is low, and dissolved oxygen is low;It is considerable with the operation of reactor Observe with the presence of a large amount of campanularians in water outlet, the front end peristoma of its polypide is by ciliated band (cilium that can be stirred by two circles forms), worm Body is in typical bell-shaped, therefore claims campanularian, belongs to protozoan.Either single or colony species, in wastewater biological Very abundant is grown in the aeration tank and filter tank for the treatment of plant, the flocculation reaction of activated sludge can be promoted, and can largely prey on free Bacterium and use clarification of water.The a large amount of of campanularian occur being the ripe performance of Activated Sludge Growth, represent that treatment effect is good.
3. the optimization of BAF operational factor
(1) hydraulic load
In pH value 7.5~8.5, inlet COD concentration 300mg/L, NH4+- N concentration is under 30mg/L service condition.Water Power load is from 0.03m3/(m2H) it is changed to 0.06m3/(m2To COD, NH4 when h)+The influence situation of-N clearances.Waterpower is born The influence of lotus is as shown in Figure 3.
As seen from Figure 3, COD clearances and ammonia nitrogen removal frank are first raised with the increase of hydraulic load and then reduced.Work as water Power load is by 0.03m3/(m2H) 0.04m is risen to3/(m2When h), COD average removal rates are increased to by 56.20% 83.16%, when hydraulic load continues to increase to 0.06m3/(m2When h), COD average removal rates decline again, are reduced to 74%, therefore water conservancy load is 0.04m3/(m2When h)), COD clearance highests.Equally, NH4 +- N clearances are also with hydraulic load 0.04m3/(m2It is maximum when h), now, ammonia nitrogen removal frank 81.26%, when hydraulic load is reduced to 0.03m3/(m2H) or Increase to 0.06m3/(m2H) ammonia nitrogen removal frank is respectively reduced to 72.50% and 75.01%.
As a result show:In the case where ensureing enough hydraulic detention times, BAF has certain water resistant power to bear Lotus impact capacity, when hydraulic load value is 0.03~0.06m3/(m2When h)), BAF reactor can guarantee that higher Organic matter, ammonia nitrogen removal frank it is horizontal.
When hydraulic load is less than or greater than 0.03~0.06m3/(m2When h)), COD clearances and ammonia nitrogen removal frank have Declined.Because keeping certain gas-water ratio, hydraulic load is too high, and the haptoreaction time of microorganism and substrate is reduced, and is unfavorable for The removal of pollutant;Meanwhile higher filtering velocity also increases excessively stream speed and the hydraulic shear between filtering layer, make biomembrane be more easy to by Elution, so that the removal efficiency of pollutant declines.And increase hydraulic load means to reduce hydraulic detention time simultaneously (HRT) unfavorable status will be in being carbonized in the competition of heterotroph by, growing slower nitrobacteria nitrite bacteria, overall Activity decrease, so as to reduce the nitrification ability of whole reactor.
(2) gas-water ratio
PH be 7.5~8.5, hydraulic load 0.04m3/(m2H), inlet COD concentration 300mg/L, N H4 +- N is dense Spend under the service condition for 30mg/L, gas-water ratio is respectively 3:1、6:1、12:To COD, NH in the case of 14 +The shadow of-N clearances Ring, the influence result of different gas-water ratios is as shown in Figure 4.
As seen from Figure 4, with the gradual increase of gas-water ratio, BAF is to COD, NH4 +- N removal ability Gradually increase.When gas-water ratio is by 3:1 brings up to 6:When 1, COD, NH4 +- N clearance is respectively by 66.71%, 76.17% increase To 79.85%, 80.6%, increase is relatively obvious.When gas-water ratio is by 6:1 brings up to 12:When 1, COD, NH4 +- N clearance Increase but unobvious, COD clearance value addeds are less than 1%.
As a result show:BAF has higher oxygen utilization and conversion capability.In gas-water ratio 6:It can obtain when 1 Good oxidation effect so that aerobic bacteria can well grow, and reactor shows stable treatment effect.With aeration quantity Increase, liquid less turbulence caused by air bubbling increase, be advantageous to oxygen in gas phase into water and filler surface transmission, reaction The concentration of oxygen improves in system, the oxygen of abundance is provided for aerobic microbiological, therefore pollutants removal rate increases and carried with aeration quantity It is high.But if aeration quantity is excessive, the concentration of oxygen is limited by equilbrium solubility in reaction system, and dissolved oxygen does not increase not only, mistake Strong turbulent flow causes coming off for biomembrane in the parsing and filler of oxygen in water on the contrary, reduces the dense of immobilized microorganism Degree, is unfavorable for the removal of pollutant.And aeration quantity is excessive can also increase power consumption.
Embodiment 2
It is 2 by volume by walnut shell and zeolite:1 it is well mixed be used as aerating biological filter pool filler, it is same by embodiment 1 Mode startup optimization, monitoring result shows that now BAF success biofilm needs 23 days, COD and NH4 +- N removal Rate is respectively 73.3%~87.5% and 63.2%~77.4%.
Embodiment 3
It is 4 by volume by walnut shell and zeolite:1 it is well mixed be used as aerating biological filter pool filler, it is same by embodiment 1 Mode startup optimization, monitoring result shows, now BAF success biofilm needs 27 days, COD and NH4 +- N removal Rate respectively reaches 71.8%~89.6% and 65.1%~80.6%.
BAF combined stuffing of the present invention, it is compared with other fillers, and biofilm speed is fast under equal conditions, biofilm Success only about needs more than 20 days;To pollutant (COD, N H4 +- N) removal effect is good,
And filler is common agricultural discarded object, wide material sources are cheap, are adapted to a large amount of use.

Claims (1)

1. application of a kind of combined stuffing in BAF, it is characterised in that specifically implement according to following steps:
Step 1, the static biofilm stage
It is 3~4 by volume by walnut shell and zeolite that average grain diameter is 4~6mm:1 it is well mixed after load aeration and biological filter Pond, and activated sludge is injected in filter tank and carries out stewing exposure, make sludge activity recovery, sludge dosage is defined to fill filter tank, connects Intake after kind sludge with small water, and be passed through air and carry out aeration agitation, taken in filter tank 1/3 upper solution within every 24 hours Go out, and supplement simulated wastewater, daily periodic monitor reactor effluent quality, that is, monitor pH, DO, COD and NH4 +- N, and micro- The upgrowth situation of microorganism on Microscopic observation filler, enters continuous cultivation stage after 7 days;
Aeration quantity is 9L/h in step 1, and using intermittent aeration, 1h is stood to cultivate microorganism after being aerated 3h;
Step 2, continuous cultivation stage
Discharge fails the suspension microorganism of effective biofilm, with simulated wastewater continuum micromeehanics and is passed through air, keeps biofilter Hydraulic detention time is 12h, and dissolved oxygen concentration is kept during biofilm in 4mg/L, on the premise of dissolved oxygen concentration meets to require, Aeration quantity is reduced as far as possible, the reactor effluent quality of timing detection daily, that is, monitors pH, DO, COD and NH4 +- N, and observe filler The upgrowth situation of upper microorganism;If effluent quality fluctuates smaller, COD and NH4 +- N clearances tend towards stability, considerable under the microscope Observe and contain more campanularian in water outlet, illustrate to have been formed and just gradually grown into through domestication culture after a while, biomembrane It is ripe, there is stronger anti-load impact ability, determine biofilm success;
Step 3, the BAF operation phase
After biofilm success, pH value 7.5~8.5, inlet COD concentration 300mg/L, NH4 +- N concentration is run under the conditions of being 30mg/L, Daily periodic monitor reactor effluent quality, that is, monitor pH, dissolved oxygen, COD, NH4 +-N、NO2 -- N and NO3 -- N water quality index;
Aeration quantity is 9~12L/h, 0.03~0.06m of hydraulic load in step 33/(m2H), gas-water ratio is 3~12:1.
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CN108328737B (en) * 2017-11-30 2020-10-20 河海大学 Micro-ecological substrate for strengthening treatment of aquaculture wastewater based on artificial wetland, preparation method and application thereof
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