CN106745689B - Biological rotating disc treatment method for synthetic leather wastewater - Google Patents
Biological rotating disc treatment method for synthetic leather wastewater Download PDFInfo
- Publication number
- CN106745689B CN106745689B CN201710079775.6A CN201710079775A CN106745689B CN 106745689 B CN106745689 B CN 106745689B CN 201710079775 A CN201710079775 A CN 201710079775A CN 106745689 B CN106745689 B CN 106745689B
- Authority
- CN
- China
- Prior art keywords
- peanut shell
- rotating cage
- water
- filler
- rotating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C02F3/02—Aerobic processes
- C02F3/08—Aerobic processes using moving contact bodies
- C02F3/082—Rotating biological contactors
-
- 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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/38—Polymers
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a biological rotating disc treatment method for synthetic leather wastewater, wherein a rotating cage is directly made of chitosan fiber mesh instead of a disc, and modified peanut shell filler is added into the rotating cage. The biomembrane can be fixed on the surface of the filler and the rotating cage, the lower half part of the rotating cage is immersed in water, and the carrier and the biomembrane on the rotating cage are alternately exposed in the air and immersed in the water along with the rotation of the rotating cage, so that the purposes of oxygenating and treating wastewater are achieved. The reactor has the advantages of simple equipment, easy manufacture, low investment cost and the like.
Description
Technical Field
The invention belongs to the technical field of synthetic leather wastewater treatment, and particularly relates to a biological rotating disc treatment method for synthetic leather wastewater.
Background
The biological rotating disk (RBC) method for treating sewage/wastewater has been used for more than 50 years, is a technology for treating wastewater by a biological membrane method, is developed on the basis of a biological filter, and is widely applied to treatment of various domestic sewage and industrial wastewater.
The biological rotating disk is composed of a series of disks mounted on a horizontal rotating shaft, the waste water enters an oxidation tank at a certain flow rate, the disk part is immersed in water (about 40% -45%), when the disk rotates in the tank at a low linear speed, microorganisms adsorbed on the disk are alternately contacted with organic matters in the waste water and oxygen in the air to perform facultative anaerobic and aerobic digestion, so that the organic matters and certain ions in the waste water are degraded, and the aim of purifying the waste water is fulfilled.
The factors influencing the wastewater treatment of the biological rotating disk include disk material, rotating speed, Hydraulic Retention Time (HRT), organic load and hydraulic load, the number of stages of the rotating disk, temperature, disk immersion area and the like, wherein the disk material, namely a carrier of a biological membrane is the most critical factor, and the performance of the disk material directly determines the decontamination effect of the rotating disk. The existing biological rotating disk mainly adopts corrugated plastic plates, glass steel plates and the like, and the disk is single in shape, small in specific surface area, poor in film forming performance, low in treatment efficiency, short in service life and the like, so that finding a disk material with large specific surface area, good film forming performance, light weight and corrosion resistance is a main direction of current RBC research. In the experiment, active carbon is used as a carrier attached to a biological membrane to prepare a biological rotating disc plate, and the decontamination effect of the biological rotating disc on organic matters in sewage is investigated.
Chitosan is a natural cationic polysaccharide obtained by deacetylating chitin. The chitosan molecule has free amino, is easy to form salt in acid solution and has cationic property. The chitosan has the characteristics of nature, no toxicity, biodegradability and the like, and the chitin serving as a raw material for preparing the chitosan widely exists in the nature. The chitosan and the derivatives thereof as environment-friendly materials can be used as flocculating agents, adsorbents, chelating agents, scale inhibitors, sludge conditioners and the like, and are particularly widely applied to water treatment as flocculating agents.
Disclosure of Invention
The invention aims to provide a disc material for treating wastewater by a biological rotating disc and a preparation method thereof.
The biological rotating disk is realized by the following technical scheme that a rotating cage is directly made of chitosan fiber mesh to replace a disk, modified peanut shell filler is added into the rotating cage, a biological membrane can be fixed on the filler and the surface of the rotating cage, the lower half part of the rotating cage is immersed in water, and along with the rotation of the rotating cage, a carrier and the biological membrane on the rotating cage are alternately exposed in the air and immersed in the water, so that the purposes of oxygenation and wastewater treatment are achieved. The reactor has the advantages of simple equipment, easy manufacture, low investment cost and the like.
The chitosan fiber is a high molecular functional material with certain strength prepared by dissolving chitosan serving as a main raw material in a proper solvent to prepare a spinning solution with certain concentration and then carrying out processes of spinning, solidification, stretching and the like.
The modified peanut shell filler is prepared by respectively washing peanut shells with tap water and deionized water, airing, crushing and sieving to prepare peanut shell particles with the particle size of 250-350 mu m. Extracting the peanut shell particles for 50 min at constant temperature of 318K under 5-7 MPa by using absolute ethyl alcohol as a solvent and liquefied CO2 as an expansion gas in a material-liquid ratio of 1:5(g: mL) and under 5-7 MPa, slowly discharging CO2 gas to automatically separate gas from liquid, combining and collecting an ethanol leaching liquor and a washing liquor, and performing centrifugal separation to obtain the peanut shell extracted effective component with natural activity. Washing the separated residue with water, and drying at 300K to obtain the modified peanut shell filler.
To further verify the difference in soil removal performance between the modified peanut shell filler and the unmodified peanut shell filler, the inventors conducted the following comparative tests.
Experimental data
1. RBC is a single-shaft four-stage serial rotary disk, the net effective volume is 8.50L, and the total number of disks is 16. Modified peanut shell filler is filled in the rotating cage of one set of four-stage serial rotating discs, and unmodified peanut shell filler is filled in the rotating cage of the other set of four-stage serial rotating discs.
2. The COD mass concentration is determined by adopting a standard potassium dichromate titration method; the mass concentration of ammonia nitrogen adopts a nano-grade reagent spectrophotometry, a 752N ultraviolet spectrophotometer, and lambda =420 nm.
3. The biofilm thickness observation method was analyzed using an optical microscope with a cursor. A filler with a biofilm was taken out, carefully gripped with forceps, a 1 to 1.5 mm thin sheet was cut out in the radial direction with a razor blade, placed on a glass slide, several points of clean water were dropped, the film thickness and growth were measured under a microscope, and a photograph was taken with an RKC series USB2.0 digital camera.
4. The wastewater used in the experiment is taken from wastewater discharged from a synthetic leather production line of the company, barrel washing water and the like.
5. The activated sludge was obtained from a sewage treatment plant in the area of Yinan county. Diluting the activated sludge and the synthetic leather wastewater according to the volume ratio of 4: 2, and adding the diluted activated sludge and the synthetic leather wastewater into an oxidation tank, wherein the diluted activated sludge and the synthetic leather wastewater account for about 30% of the effective volume of the turntable. Starting the turntable to rotate, so that microorganisms in the water body can be attached to the disk sheet to grow; the rotating speed of the disc is 4-5 r/min, and the disc continuously runs; the water inlet and outlet modes are intermittent and continuous; taking out part of the mud-water mixture every 3 d, settling the mud-water mixture, injecting the settled mud back into the oxidation tank, and adding newly-prepared wastewater according to the volume ratio of the mud to the water of 4: 2 until the whole oxidation tank is filled with water. When a layer of stick-slip matter is attached to the disc, a certain amount of low-load simulated wastewater can be properly added to culture and domesticate the biological membrane. When the operation lasts for about 20 days, the biological membrane acclimation is considered to be finished when the COD removal rate is more than 80 percent and the NH 3-N removal rate is more than 70 percent. After the biofilm formation is successful, the inoculated sludge can be removed and water inflow is started, and the wastewater treatment performance of the biological membrane is detected.
6. Observation of surface biological phase of fillers before and after modification of peanut shells
The thickness of the biological film in the starting process of the film hanging is observed and measured by an optical microscope and an RKC series USB2.0 digital camera, the thickness of the biological film in different periods is shown in table 1, and the obvious difference of the thickness of the biological film after the film hanging is successful can be seen compared with that of the biological film which is not modified.
TABLE 1 biofilm thickness on surface of 2 fillers at different times
The biofilm thickness on the surface of 2 fillers increased with the growth time. The modified peanut shell filler surface biological film grows fastest, is thick and loose, has small mass transfer resistance and is beneficial to improving the sewage treatment capacity. The unmodified filler biological film has slow growth speed, and the filler biological film is thinner and more compact.
On the basis of the experiment, the company carries out pilot test treatment on the synthetic leather wastewater discharged from the production line of the company according to the biological rotating disc used in the experiment, the pilot test result is similar to the experiment result, and the treatment result is shown in the following table. The biological rotating disc has better capability of treating synthetic leather wastewater.
As can be seen from the above table, the modified peanut shell filler has a significantly improved COD removal rate compared to the unmodified peanut filler, which is mainly attributed to the increased specific surface area and the greatly increased biomass after the filler is modified. In addition, the microorganism forms a biological surface layer with large aperture by virtue of the space structure of protein molecules, which can improve mass transfer efficiency and is beneficial to removing pollutants. The rotating cage is made of chitosan fibers, grooves are formed in the surfaces of the chitosan fibers, the rotating cage is of a microporous structure, the diameters of the chitosan fibers immersed in water are slightly increased, the moisture absorption and expansion of the chitosan fibers increase the water-facing area, and the rotating cage is favorable for the propagation and growth of microorganisms.
Detailed Description
The biological rotating disk directly uses chitosan fiber net to make rotating cage instead of disk, modified peanut shell filler is added into the rotating cage, the biological membrane can be fixed on the filler and the surface of the rotating cage, the lower half part of the rotating cage is immersed in water, along with the rotation of the rotating cage, the carrier and the biological membrane on the rotating cage are alternatively exposed in the air and immersed in the water, thus achieving the purposes of oxygenation and wastewater treatment. The chitosan fiber is a high molecular functional material with certain strength prepared by dissolving chitosan serving as a main raw material in a proper solvent to prepare a spinning solution with certain concentration and then carrying out processes of spinning, solidification, stretching and the like. The modified peanut shell filler is prepared by respectively cleaning peanut shells with tap water and deionized water, air drying, pulverizing, and sieving to obtain 300 μm peanut shell granules. Extracting the peanut shell particles at constant temperature of 318K under 6 MPa for 50 min by using absolute ethyl alcohol as a solvent and liquefied CO2 as an expansion gas at a material-liquid ratio of 1:5(g: mL) and under 6 MPa, slowly discharging CO2 gas to automatically separate gas from liquid, combining and collecting an ethanol leaching liquor and a washing liquor, and performing centrifugal separation to obtain the peanut shell extracted effective components with natural activity. Washing the separated residue with water, and drying at 300K to obtain the modified peanut shell filler.
Claims (1)
1. A process for treating the sewage generated by synthesizing leather by rotating disk includes such steps as preparing the rotating cage with chitosan fibre net instead of disk, adding modified peanut shell filler, dissolving chitosan fibre in proper solvent to obtain spinning solution, spinning, solidifying and stretching to obtain high-molecular functional material, and features that the modified peanut shell filler is prepared from chitosanWashing peanut shell with tap water and deionized water, air drying, pulverizing, sieving to obtain 250-350 μm peanut shell granule, and liquefying CO with anhydrous ethanol as solvent2The expanding gas is prepared by extracting peanut shell particles at constant temperature of 318K and pressure of 5-7 MPa in a material-liquid ratio of 1g to 5mL for 50 min, and slowly releasing CO2Gas, gas-liquid automatic separation, combining and collecting ethanol leaching liquor and washing liquor, obtaining peanut shell extract effective components with natural activity after centrifugal separation, washing the separated residue with water, and drying at 300K to obtain the modified peanut shell filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710079775.6A CN106745689B (en) | 2017-02-15 | 2017-02-15 | Biological rotating disc treatment method for synthetic leather wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710079775.6A CN106745689B (en) | 2017-02-15 | 2017-02-15 | Biological rotating disc treatment method for synthetic leather wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106745689A CN106745689A (en) | 2017-05-31 |
| CN106745689B true CN106745689B (en) | 2020-11-13 |
Family
ID=58957027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710079775.6A Active CN106745689B (en) | 2017-02-15 | 2017-02-15 | Biological rotating disc treatment method for synthetic leather wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106745689B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6146535A (en) * | 1994-06-24 | 2000-11-14 | Sutherland; George | Organic recovery method using hollow fiber microfilters |
| CN1603407A (en) * | 2004-11-01 | 2005-04-06 | 北京航空航天大学 | Preparation of chitosan imbedded microbe sphere and method for biological treatment of sewage using same |
| CN103055821A (en) * | 2012-12-17 | 2013-04-24 | 福州赛孚玛尼环保科技有限公司 | Chemical modification method of purification peanut shells |
| CN203007016U (en) * | 2013-01-18 | 2013-06-19 | 重庆大学 | Novel combined-type biological rotating disc |
-
2017
- 2017-02-15 CN CN201710079775.6A patent/CN106745689B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6146535A (en) * | 1994-06-24 | 2000-11-14 | Sutherland; George | Organic recovery method using hollow fiber microfilters |
| CN1603407A (en) * | 2004-11-01 | 2005-04-06 | 北京航空航天大学 | Preparation of chitosan imbedded microbe sphere and method for biological treatment of sewage using same |
| CN103055821A (en) * | 2012-12-17 | 2013-04-24 | 福州赛孚玛尼环保科技有限公司 | Chemical modification method of purification peanut shells |
| CN203007016U (en) * | 2013-01-18 | 2013-06-19 | 重庆大学 | Novel combined-type biological rotating disc |
Non-Patent Citations (2)
| Title |
|---|
| 乙醇改性花生壳前后对其处理含Cd2+废水的研究;陈伟华等;《上饶师范学院学报》;20151231;第35卷(第6期);57-62页 * |
| 水处理生物膜载体研究进展;蒋凯凤等;《浙江林学院学报》;20100630;第27卷(第3期);451-455页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106745689A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106745726B (en) | Hydrogen-based bio-membrane reactor and method for removing perchlorate in underground water by using same | |
| Wang et al. | Optimization of microalgal bead preparation with Scenedesmus obliquus for both nutrient removal and lipid production | |
| CN115055170A (en) | Wood-based modified nano-cellulose water purification material with high adsorption performance and preparation method and application thereof | |
| CN109576159B (en) | Chlorella W4 capable of removing heavy metals in water with high heavy metal content and application thereof | |
| Onyshchenko et al. | Influence of microalgae wastewater treatment culturing conditions on forward osmosis concentration process | |
| Yang et al. | The performance and microbial communities of Anammox and Sulfide-dependent autotrophic denitrification coupling system based on the gel immobilization | |
| Li et al. | Characterization of Microcystis Aeruginosa immobilized in complex of PVA and sodium alginate and its application on phosphorous removal in wastewater | |
| CN109504642B (en) | Denitrifying bacterium and application thereof | |
| CN107381821B (en) | Method for treating overproof mercury in seawater by using microalgae | |
| CN106745689B (en) | Biological rotating disc treatment method for synthetic leather wastewater | |
| CN109576160B (en) | Chlorella W3 capable of removing heavy metals in water with high heavy metal content and application thereof | |
| Sun et al. | Optimization of entrapping conditions of nitrifying bacteria and selection of entrapping agent | |
| Zhang et al. | Preparation of tannin-immobilized collagen/cellulose bead for Pb (II) adsorption in aqueous solutions | |
| He et al. | Preparation of different activated sludge immobilized carriers and their organic wastewater treatment performance by microbial community | |
| CN107227260B (en) | Biological adsorbent for adsorbing thallium ions and preparation method and application thereof | |
| CN111389350A (en) | Preparation method of hydrothermal carbon adsorbent for removing heavy metal cadmium in water | |
| CN111621423A (en) | High-phosphorus-loading living microalgae and preparation method and application thereof | |
| CN108546650B (en) | Chlorella W6 capable of quickly removing heavy metals in water with high heavy metal content and application thereof | |
| CN114477452B (en) | Method for removing tetracycline antibiotics in landfill leachate | |
| CN109576161B (en) | Chlorella W1 capable of removing heavy metals in water with high heavy metal content and application thereof | |
| Wu et al. | Characterization of the immobilized algae-based bioreactor with external ceramic ultrafiltration membrane to remove nutrients from the synthetic secondary wastewater effluent | |
| CN113604361A (en) | Method for culturing modified living microalgae by using high-salinity wastewater and application thereof | |
| CN107364971B (en) | Method for treating excessive copper in seawater by using microalgae | |
| Zielinska et al. | Membrane filtration for valorization of digestate from the anaerobic treatment of distillery stillage | |
| CN113457645B (en) | High-adsorptivity water treatment diaphragm coated with nitrogen-doped porous carbon and preparation process thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 276300 Economic Development Zone, Yinan County, Linyi City, Shandong Province Patentee after: Shandong Zhongxing Zehui New Material Co.,Ltd. Address before: 276300 Industrial Park, Yinan County, Linyi City, Shandong Province Patentee before: SHANDONG ZEHUI HI-TECH CO.,LTD. |