CN117776389A - Quick culture method and application of chopped modified basalt fiber aerobic granular sludge - Google Patents
Quick culture method and application of chopped modified basalt fiber aerobic granular sludge Download PDFInfo
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Abstract
The invention discloses a rapid culture method and application of chopped modified basalt fiber aerobic granular sludge, which belong to the technical field of wastewater treatment, wherein chopped modified basalt fiber is used as a framework structure for capturing microorganisms in a net manner so as to enable the microorganisms to be agglomerated and wrapped on the surface of C-MBF, and the chopped modified basalt fiber aerobic granular sludge is of a spherical or ellipsoidal structure with irregular internal anoxic and external aerobic edges. According to the invention, the water inlet of the aerobic granular sludge for cultivating the chopped and modified basalt fiber is actual wastewater, the COD concentration of the wastewater is 500-590 mg/L, the COD concentration of the wastewater reaches 700-750 mg/L, the ammonia nitrogen concentration of the wastewater is 90-95 mg/L, the total phosphorus concentration of the wastewater is 15-20 mg/L, the removal rate of each pollutant reaches more than 80%, and the formation time of the aerobic granular sludge can be shortened to 13-17 days by using C-MBF.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a rapid culture method and application of chopped modified basalt fiber aerobic granular sludge.
Background
Livestock and poultry raising wastewater has become a research hotspot in the field as one of the main sources of agricultural pollution, wherein the pig raising wastewater is a major concern due to large discharge and pollutant "contribution". Not only pig raising waste waterHas high COD (3000-12000 mg/L) and high NH 4 + N (800-2200 mg/L) and high solids suspended SS (100-200 mg/L), and antibiotic contaminants, which if not properly treated, can have serious impact on water environment and human health. Therefore, it is imperative to explore a technical method for efficiently treating pig raising wastewater. The Aerobic Granular Sludge (AGS) is an aggregate with microorganism self-immobilization, and has compact structure and high sludge concentration compared with common activated sludge, and can remove nitrogen and phosphorus while removing organic matters; the sedimentation performance is excellent, the mud-water separation effect is good, and excessive surplus sludge is not easy to generate; in addition, AGS can bear the load impact of high-concentration organic wastewater, and has great advantages in the aspects of removing refractory and toxic pollutants. Therefore, the AGS technology can be used as an aerobic biological method with great potential for biological treatment of pig raising wastewater.
However, AGS technology still has problems in the treatment of swine wastewater. Firstly, the AGS forming speed is low, and researches show that when simulated pig raising wastewater is taken as water inlet, the AGS can be formed after 50 days of inoculation sludge; when AGS is cultured by using actual pig raising wastewater, the microbial community structure inside the sludge is obviously affected, the formation speed is slower, and the particle size is smaller. In addition, AGS is affected by external factors (such as microbial community structure, microbial metabolism, extracellular polymers, oxygen mass transfer, pH and temperature), and is easily decomposed, so that the biological system collapses, and the quality of effluent water is affected, which limits the practical application of AGS technology. Therefore, how to shorten the formation time of AGS and optimize the internal structure of AGS to ensure long-term stable operation of AGS is two problems that need to be solved in the process of treating pig raising wastewater by the technology.
Disclosure of Invention
The invention aims to provide a rapid culture method and application of chopped modified basalt fiber aerobic granular sludge, so as to solve the problems in the prior art. The invention aims to solve the problems of low forming speed and unstable operation of the existing aerobic granular sludge technology in engineering application, provides a novel method for rapidly culturing AGS, establishes the AGS technology which can stably operate for a long time and efficiently treat wastewater, and has more practicability.
One of the technical schemes provided by the invention is as follows:
the chopped modified basalt fiber aerobic granular sludge takes chopped modified basalt fibers (C-MBF) as a framework structure for capturing microorganisms, and the microorganisms are agglomerated and wrapped on the surface of the C-MBF; the chopped and modified basalt fiber aerobic granular sludge is of a sphere or ellipsoid structure with irregular edges and aerobic inside and anoxic outside.
The outer surface of the chopped and modified basalt fiber aerobic granular sludge is an aerobic layer, and a large amount of nitrifying bacteria are mainly enriched for nitrification, so that aerobic reaction is carried out; the middle layer which is in transition inwards is an anoxic layer, and a large amount of denitrifying bacteria are mainly enriched for denitrification to perform anoxic reaction; the chopped and modified basalt fiber aerobic granular sludge is a microbial aggregate, and can utilize abundant microorganisms to degrade macromolecular organic matters in wastewater.
The basalt fiber is flexible micron-sized inorganic fiber, and has the advantages of excellent mechanical property, large effective specific surface area, capability of being dispersed and wound in water, low cost and environment-friendly production process. The invention prepares Modified Basalt Fiber (MBF) by the method provided by patent CN 115057526A, cuts and screens the prepared MBF to obtain C-MBF with the monofilament diameter of 7-21 mu m and the length of 0.1-0.4 mm.
The C-MBF is a micron-sized flexible inorganic fiber, has good water dispersibility and biological affinity, can effectively increase the contact area between microorganisms and a carrier, is beneficial to the adhesion growth of the microorganisms on the surface of the carrier, and can load more biomass.
The C-MBF has good water dispersibility and biological affinity, can effectively increase the contact area between microorganisms and a carrier, is beneficial to the adhesion growth of the microorganisms on the surface of the carrier, and accelerates the granulation speed of sludge. In addition, the C-MBF is different from powdery crystal nucleus, is micron-sized flexible inorganic fiber, has a diameter of 13 mu m and a length of 0.1-0.6 mm, and can form a net structure through lap joint action so as to net and catch microorganisms, so that the microorganisms are agglomerated and wrapped on the surface of the C-MBF. The above process can make the formed granular sludge structure more stable.
Preferably, the monofilament diameter of the chopped modified basalt fiber is 13 μm and the length is 0.2mm.
The second technical scheme provided by the invention is as follows:
according to the rapid culture method of the chopped modified basalt fiber aerobic granular sludge, the chopped modified basalt fiber and the inoculated sludge after aeration activation are mixed, then the wastewater is added, the water inlet, aeration, standing sedimentation and water drainage are sequentially and repeatedly carried out through an intermittent operation method, the chopped modified basalt fiber is used as a framework structure, microorganisms in the sludge are caught in an internet manner, and the chopped modified basalt fiber aerobic granular sludge is formed by winding from less microorganisms to more microorganisms.
The obtained chopped modified basalt fiber aerobic granular sludge is in a sphere or spheroid structure, the chopped modified basalt fiber aerobic granular sludge sequentially comprises an anoxic layer and an aerobic layer from inside to outside, the anoxic layer and the aerobic layer are composed of facultative microorganisms and aerobic microorganisms, and the chopped modified basalt fiber aerobic granular sludge takes chopped modified basalt fibers as a framework structure so as to intercept the microorganisms and enable the microorganisms to be continuously wound, so that the aerobic granular sludge is finally formed.
The inoculated sludge after aeration and activation can provide a large amount of microorganisms for the formation of the short-cut modified basalt fiber aerobic granular sludge, and the wastewater can provide necessary nutrient substances for the growth and propagation of the microorganisms.
The invention relates to a culture bioreactor of chopped modified basalt fiber aerobic granular sludge, which is a Sequencing Batch Reactor (SBR), wherein the diameter and the effective height of a reaction device are respectively 50mm and 550mm, an aeration head is arranged at the bottom of the bioreactor, aeration can be realized, the rising air speed is controlled by a gas flowmeter, and the aeration rate is 2.5L/min; the inflow water is pumped to the bottom of the bioreactor by peristaltic pumps, the flow rate can be regulated, and the inflow amount of the inflow water can be controlled; the water outlet is connected with the water outlet tank and is controlled by the electromagnetic valve, and is discharged by gravity flow; wherein the peristaltic pump, the inflator pump and the electromagnetic valve are all automatically controlled by a microcomputer time control switch, and the experimental device is shown in figure 1.
The invention cultures the chopped modified basalt fiber aerobic granular sludge by an intermittent operation method, which comprises the following specific operation steps:
1) Adding inoculated sludge into a bioreactor, recovering activity through aeration, adding chopped modified basalt fibers, and pumping wastewater into the reactor by a peristaltic pump controlled by a time control switch until the water inlet reaches the expected water inlet position of the bioreactor, wherein the water inlet time is 12min;
2) After water inflow is finished, a time control switch (PLC) is used for controlling an inflator pump to perform aeration, and air is filled through an aeration head at the bottom of the bioreactor, so that inoculated sludge and chopped modified basalt fibers are fully mixed and collided; the chopped modified basalt fiber is freely dispersed under the action of hydraulic shearing force, the chopped modified basalt fiber is used as a skeleton structure to catch microorganisms in inoculated sludge, the microorganisms are continuously gathered and grown through winding and interception, and the chopped modified basalt fiber aerobic granular sludge with the diameter of 1-2cm is finally formed, and the aeration time is 134-161min;
3) After aeration is finished, standing and settling for 3-30min, then starting an electromagnetic valve controlled by a time control switch (PLC) to drain, and draining sludge with poor settling property out of the reactor by using selective pressure for 4min;
4) Repeating the operations of step 1), step 2) and step 3), wherein the operations of water inlet, aeration, standing sedimentation and drainage are repeatedly performed, one cycle of water inlet, aeration, standing sedimentation and drainage is repeated for 8 cycles each day, and each cycle time is 3 hours.
Preferably, the concentration of dissolved oxygen in the bioreactor is 0.5-5.0 mg/L; the reaction temperature is 20-35 ℃ and the pH value is 6-9.
Preferably, the wastewater volume exchange rate of the water inlet and outlet operations of the bioreactor is 50% in one cycle.
Preferably, the ratio of the addition amount of the chopped modified basalt fiber to the inoculation sludge is 1mg/L to 130mg/LMLSS to 1mg/L to 50mg/L MLSS per liter of wastewater.
The selective pressure in the invention is that the standing time is 3-30min, most of sludge is settled below a water outlet in 30min, only a small part of sludge with poor settling property is discharged in the process of water discharge, more and more sludge with poor settling property is discharged along with gradual shortening of settling time, and the selective pressure is acting force for sludge discharge in the process of gradual shortening of settling time.
The third technical scheme provided by the invention is as follows: .
The rapid culture method of the aerobic granular sludge or the application of the aerobic granular sludge in wastewater treatment.
The chopped and modified basalt fiber aerobic granular sludge has the advantages of common aerobic granular sludge structure in the wastewater treatment process, has the advantages of external aerobic and internal anoxic properties and large biomass, and can remove nitrogen and phosphorus while removing organic matters.
The invention has the beneficial effects that:
the invention provides a rapid culture method of aerobic granular sludge, which solves the problems of low formation speed, easy disintegration and instability of common aerobic granular sludge in the long-term operation process, and establishes an AGS technology which can stably operate for a long time and efficiently treat wastewater, so that the sludge granulation technology has more practicability.
According to the invention, the influent water of the aerobic granular sludge is actual wastewater, the COD concentration of the wastewater is 500-590 mg/L, the COD concentration of the wastewater reaches 700-750 mg/L after supplementing a carbon source, the ammonia nitrogen concentration of the wastewater is 90-95 mg/L, the total phosphorus concentration of the wastewater is 15-20 mg/L, the pollutant removal rate reaches more than 80%, and the aerobic granular sludge can be formed on 13-17 days by utilizing the chopped modified basalt fiber.
The aerobic granular sludge obtained by the rapid culture method of the aerobic granular sludge can be recycled, and can continuously treat the wastewater for half a year under the condition that the wastewater treatment is required every day.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a cultivation bioreactor for aerobic granular sludge according to the present invention;
FIG. 2 is a macroscopic photograph of aerobic granular sludge obtained by culturing in example 1 of the present invention;
FIG. 3 is a photograph of aerobic granular sludge of different particle sizes obtained by culturing in the example of the present invention.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The bioreactor for cultivating the short-cut modified basalt fiber aerobic granular sludge is a Sequencing Batch Reactor (SBR), and the reactor cultures the aerobic granular sludge by an intermittent operation method. The inoculated sludge is activated sludge in an aeration tank of a sewage treatment plant in Zhenjiang city, aeration is carried out before the bioreactor is used for water inflow to recover the activity, and the chopped modified basalt fiber is quantitatively added into the bioreactor before operation.
An aeration head is arranged at the bottom of the bioreactor, so that aeration can be realized, and the ascending air speed is controlled by using an air flow meter; the inflow water is pumped to the bottom of the SBR by peristaltic pump, the flow rate can be regulated, and the inflow water inflow is controlled; the water outlet is connected with the water outlet tank and is controlled by the electromagnetic valve, and is discharged by gravity flow; wherein peristaltic pump, air compressor (PLC), solenoid valve are all controlled by microcomputer time control switch automatically, figure 1 is schematic diagram of bioreactor.
The chopped modified basalt fibers added in the embodiment of the invention are crushed for a plurality of times by a ball mill, and the chopped modified basalt fibers with the lengths of 0.2mm, 0.4mm and 0.6mm are respectively screened out by a special slapping screen in a laboratory.
Example 1A method for rapid cultivation of short cut modified basalt fiber aerobic granular sludge
The wastewater discharged from a Zhenjiang pig farm is used as a treatment object, and the intermittent operation method provided by the invention is adopted to perform domestication culture of aerobic granular sludge and wastewater treatment, and the quality of inflow water is shown in a table 1.
TABLE 1
| Index of water quality | Water temperature (DEG C) | pH | COD(mg/L) | NH 4 + -N(mg/L) | TP(mg/L) | TN(mg/L) |
| Content of | 25 | 8～9 | 700～750 | 90～95 | 15～20 | 130～135 |
The specific culture method is as follows:
firstly, quantitative chopped modified basalt fiber (50 mg/L) with the diameter of a single wire of 13 mu m and the length of 0.2mm is added into an SBR bioreactor, and inoculated sludge with the concentration of 5000mg/L is added, wherein the inoculated sludge is activated sludge for aeration for 24 hours. After the wastewater is subjected to primary screening, the wastewater is pumped into a reactor by a water distribution tank, aeration is started, the aeration time is gradually increased from 134min to 161min (the aeration time on day 1 is 134min, the aeration time on day 2 is 144min, the aeration time on day 3 is 154min, the aeration time on day 4 is 158min, the aeration time on day 5 is 161 min), the sedimentation time is gradually reduced from 30min to 3min (the sedimentation time on day 1 is 30min, the sedimentation time on day 2 is 20min, the sedimentation time on day 3 is 10min, the sedimentation time on day 4 is 6min, the sedimentation time on day 5 is 3 min), the effluent is discharged from a water outlet in the middle of the reactor, and the volume exchange rate of the wastewater in the water inlet and drainage operation is 50%.
The bioreactor operates for 8 periods every day, after 10 days (aeration time and sedimentation time are 161min and 3min respectively in 6 th to 10 th days), aerobic granular sludge based on the chopped modified basalt fiber forms a rudiment with the diameter of about 0.5mm, and then the bioreactor keeps the sedimentation time and aeration time to be 3min and 161min respectively to operate, and mature chopped modified basalt fiber aerobic granular sludge can be formed after 17 days; in the running process, the pH value of the wastewater in the bioreactor is detected, the fluctuation range is 8.0-9.0, and the dissolved oxygen value (0.5-5.0 mg/L) and the hydraulic shear force of the bioreactor are controlled by adjusting the aeration flow. FIG. 2 is a macroscopic photograph of the chopped and modified basalt fiber aerobic granular sludge obtained by the culture in the embodiment; FIG. 3 is a photograph of the chopped and modified basalt fiber aerobic granular sludge with different grain sizes obtained by the culture in the embodiment.
The system runs continuously for 50 days, the COD average concentration of the effluent is 91mg/L, the ammonia nitrogen average concentration is 9mg/L, the total nitrogen average concentration is 37mg/L, and the total phosphorus average concentration is 13mg/L.
Example 2
The same as in example 1 was found only in that the addition amount of the chopped modified basalt fiber was 50mg/L and the concentration of the added inoculation sludge was 6500mg/L.
Example 3
The same as in example 1 was found only in that the addition amount of the chopped modified basalt fiber was 50mg/L and the concentration of the added inoculation sludge was 2500mg/L.
Example 4
In the same way as in example 1, under the condition that other production conditions and processes of the device are unchanged, the pig raising wastewater is used as the inlet water to culture the chopped modified basalt fiber aerobic granular sludge, and the water quality conditions are as follows: COD concentration is 700mg/L, NH 4 + The concentration of N is 95mg/L, the concentration of TP is 17mg/L and the concentration of TN is 135mg/L.
Example 5
The only difference from example 4 is that the length of the added modified basalt fiber was 0.1mm.
Example 6
The same as in example 1 was found only in that the chopped modified basalt fiber aerobic granular sludge formed after 13 days was used as mature aerobic granular sludge.
Comparative example 1
The only difference from example 4 is that the length of the added modified basalt fiber was 0.4mm.
Comparative example 2
The only difference from example 4 is that no modified basalt fiber was added.
The results of wastewater treatment in examples 4-5 and comparative examples 1-2 are shown in Table 2.
TABLE 2
As can be seen from table 2: a comparison of the length of the chopped modified basalt fiber to the forming performance and the decontamination efficiency of the aerobic granular sludge shows that when the chopped modified basalt fiber is not added or the length of the added chopped modified basalt fiber is too long (0.4 mm), the formed aerobic granular sludge has poor sludge performance, decontamination efficiency and sludge stability. When the length of the chopped modified basalt fiber is 0.2 and 0.1mm, the formed aerobic granular sludge has optimal performance, and the formed aerobic granular sludge has the same sludge concentration and sedimentation performance, wherein the high sludge concentration indicates that the aerobic granular sludge obtained by the rapid culture of the invention has high biological activity; the high sedimentation performance shows that the aerobic granular sludge obtained by the rapid culture has good sedimentation performance, is not easy to expand and is not easy to be discharged out of the reactor, and can exert larger biological removal effect. COD and NH 4 + The removal rate of N is above 87% and 90%, but the OD600 value of the aerobic granular sludge formed by the short-cut modified basalt fiber with the length of 0.2mm is lower, which shows that the stability is better, and the aerobic granular sludge formed by the short-cut modified basalt fiber with the length of 0.2mm is preferably selected from the aspect of long-term operation.
The incubation time was set forth in example 6The mature chopped modified basalt fiber aerobic granular sludge is obtained after 13 days of shortening, thus the measured sludge has better sedimentation performance and high sludge concentration (the SVI (mL/g) value of the sludge is in a better range, which means that the sedimentation performance is better, the MLSS (mg/L) measured value is higher than that of the example 4, which proves that the sludge has very high biological activity), and compared with the example 1, the sludge has even COD and NH 4 + The removal rate of N tends to decrease, but the OD600 measurement is lower, which proves that the aerobic granular sludge with good stability can be obtained as a whole.
Comparative example 3
The difference from example 4 is that the aeration time was 158min.
Comparative example 4
The difference from example 4 is only that the sedimentation times are all 10min.
Comparative example 5
The same as in example 4 was found only in that the addition amount of the chopped modified basalt fiber was 50mg/L and the concentration of the added inoculation sludge was 2500mg/L.
Comparative example 6
The same as in example 4 was found only in that the addition amount of the chopped modified basalt fiber was 50mg/L and the concentration of the added inoculation sludge was 6500mg/L.
The results of wastewater treatment in comparative examples 3 to 6 are shown in Table 3.
TABLE 3 Table 3
And (3) performing aerobic granular sludge recycling test:
in order to prove that the aerobic granular sludge prepared by the rapid culture method of the aerobic granular sludge can be recycled, on the basis of the embodiment 1, wastewater is continuously treated every day until the sludge sedimentation performance, the sludge concentration, the effluent COD concentration and NH 4 + The N concentration and TN concentration can not reach the standard, and the continuous treatment time can reach half a year.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (10)
1. The aerobic granular sludge is characterized in that the chopped modified basalt fiber is used as a framework structure to net catch microorganisms, so that the microorganisms are agglomerated and wrapped on the surface of the chopped modified basalt fiber;
the chopped and modified basalt fiber aerobic granular sludge is of a sphere or ellipsoid structure with irregular edges and aerobic inside and anoxic outside.
2. The aerobic granular sludge of chopped and modified basalt fiber according to claim 1, wherein the monofilament diameter of the chopped and modified basalt fiber is 7-21 μm and the length is 0.1-0.4 mm.
3. The aerobic granular sludge of short-cut modified basalt fiber according to claim 2, wherein the monofilament diameter of the short-cut modified basalt fiber is 13 μm and the length is 0.2mm.
4. A method for rapid cultivation of the aerobic granular sludge of the chopped modified basalt fiber as claimed in any one of claims 1 to 3, characterized in that the chopped modified basalt fiber is mixed with the inoculated sludge after aeration activation, and then added with the wastewater; and (3) sequentially and repeatedly carrying out water inlet, aeration, standing sedimentation and water drainage by an intermittent operation method, and using the chopped modified basalt fiber as a framework structure to net catch microorganisms in the sludge and winding to form the chopped modified basalt fiber aerobic granular sludge.
5. The rapid culture method according to claim 4, wherein the specific operation method is as follows: adding inoculated sludge into a bioreactor, recovering activity through aeration, adding chopped modified basalt fibers, pumping wastewater into the bioreactor by a peristaltic pump to a water inlet position, aerating by an inflator pump after water inlet is finished, and filling air through an aeration head at the bottom of the bioreactor, wherein the inoculated sludge and the chopped modified basalt fibers are fully mixed and collided; after aeration is finished, standing and settling, and then draining water; and repeating the operations of water inflow, aeration, standing sedimentation and drainage by an intermittent operation method, wherein the operations of water inflow, aeration, standing sedimentation and drainage are repeated for one cycle, 8 cycles are repeated every day, each cycle time is 3h, and the short-cut modified basalt fiber aerobic granular sludge with the diameter of 1-2cm is formed after continuous transportation for 13-17 days.
6. The method according to claim 5, wherein the ratio of the addition amount of the chopped modified basalt fiber to the inoculation sludge is 1mg/L to 130mg/LMLSS to 1mg/L to 50mg/L MLSS per liter of wastewater.
7. The rapid culture method according to claim 5, wherein the concentration of dissolved oxygen in the bioreactor is 0.5-5.0 mg/L, the reaction temperature is 20-35 ℃, and the pH value is 6-9.
8. The rapid culture method according to claim 5, wherein the aeration time is 134 to 161min and the settling time is 3 to 30min.
9. The rapid culture method according to claim 5, wherein the volume exchange rate of wastewater in the water inlet and water outlet operation of the bioreactor is 50% in one cycle.
10. Use of the chopped modified basalt fiber aerobic granular sludge of any one of claims 1 to 3 or the rapid culture method of any one of claims 4 to 9 in wastewater treatment.
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