CN113955849A - Slow-release carbon source for landscape water treatment and preparation method thereof - Google Patents
Slow-release carbon source for landscape water treatment and preparation method thereof Download PDFInfo
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- CN113955849A CN113955849A CN202111315060.9A CN202111315060A CN113955849A CN 113955849 A CN113955849 A CN 113955849A CN 202111315060 A CN202111315060 A CN 202111315060A CN 113955849 A CN113955849 A CN 113955849A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 claims abstract description 15
- 229920000903 polyhydroxyalkanoate Polymers 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 12
- 229920001817 Agar Polymers 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 11
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- 239000008272 agar Substances 0.000 claims abstract description 11
- 239000011782 vitamin Substances 0.000 claims abstract description 11
- 235000013343 vitamin Nutrition 0.000 claims abstract description 11
- 229940088594 vitamin Drugs 0.000 claims abstract description 11
- 229930003231 vitamin Natural products 0.000 claims abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 10
- 239000011707 mineral Substances 0.000 claims abstract description 10
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 8
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000000945 filler Substances 0.000 claims description 22
- 238000001125 extrusion Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 11
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 10
- 150000003722 vitamin derivatives Chemical class 0.000 claims description 8
- 239000004952 Polyamide Substances 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 6
- 230000003179 granulation Effects 0.000 claims description 6
- 229920002647 polyamide Polymers 0.000 claims description 6
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 5
- 239000001095 magnesium carbonate Substances 0.000 claims description 5
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 3
- 229920000604 Polyethylene Glycol 200 Polymers 0.000 claims description 2
- 229920002565 Polyethylene Glycol 400 Polymers 0.000 claims description 2
- 229920002582 Polyethylene Glycol 600 Polymers 0.000 claims description 2
- 229920002593 Polyethylene Glycol 800 Polymers 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 244000005700 microbiome Species 0.000 abstract description 7
- 235000015097 nutrients Nutrition 0.000 abstract description 5
- 230000007774 longterm Effects 0.000 abstract description 3
- 241000195493 Cryptophyta Species 0.000 description 7
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 6
- 238000005273 aeration Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 239000004155 Chlorine dioxide Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 235000019398 chlorine dioxide Nutrition 0.000 description 3
- 229910000365 copper sulfate Inorganic materials 0.000 description 3
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229920002988 biodegradable polymer Polymers 0.000 description 2
- 239000004621 biodegradable polymer Substances 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
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- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- HDTRYLNUVZCQOY-UHFFFAOYSA-N α-D-glucopyranosyl-α-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OC1C(O)C(O)C(O)C(CO)O1 HDTRYLNUVZCQOY-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 206010059866 Drug resistance Diseases 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 108010009736 Protein Hydrolysates Proteins 0.000 description 1
- HDTRYLNUVZCQOY-WSWWMNSNSA-N Trehalose Natural products O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 HDTRYLNUVZCQOY-WSWWMNSNSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- HDTRYLNUVZCQOY-LIZSDCNHSA-N alpha,alpha-trehalose Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 HDTRYLNUVZCQOY-LIZSDCNHSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 239000003124 biologic agent Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000002147 killing effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 229940038580 oat bran Drugs 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 230000002311 subsequent effect Effects 0.000 description 1
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- 238000003911 water pollution Methods 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
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
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Biological Wastes In General (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a slow-release carbon source for landscape water treatment, which is characterized by comprising the following raw materials in percentage by weight: 60-80% of polyhydroxyalkanoate, 10-20% of agar, 5-15% of polyethylene glycol, 1-5% of a polymer adhesive, 0.01-0.05% of mineral substances and 0.01-0.05% of vitamins. The invention also discloses a preparation method of the composition. The slow-release carbon source can provide long-term and stable carbon source and nutrient elements for microorganisms, thereby improving the biological denitrification efficiency and the landscape water treatment effect.
Description
Technical Field
The invention belongs to the technical field of landscape water treatment, and particularly relates to a slow-release carbon source for landscape water treatment and a preparation method thereof.
Background
Landscape water generally refers to a body of water used for visual appreciation and is generally divided into two categories: one is a natural waterscape like a natural lake, river, etc.; the other is artificial waterscape like fountain, artificial lake, small city river, etc. Along with the improvement of living standard, the requirements of people on living environment are higher and higher, and the urban water landscape is used as a component of the living environment, so that the ornamental value is increased, the water vapor circulation can be increased, and the microclimate adjusting effect is achieved. However, the landscape water pollution is increasingly prominent, and the deterioration of landscape water quality and water eutrophication can cause adverse effects on the surrounding environment.
Most of urban artificial water landscapes are closed systems, the self-purification capacity of water bodies is poor, designers often only consider the ornamental value of the urban artificial water landscapes when designing the water landscapes, and measures are not taken for maintaining the water quality, so that the water quality is deteriorated. The modern artificial water landscape has ornamental value and forms a micro-ecological system, namely the micro-ecological system of the artificial water landscape.
Landscape water generally comprises ponds, artificial lakes, small river channels flowing through cities and the like, and the landscape water treatment needs to be carried out according to local conditions and comprehensive treatment, and common methods comprise physical methods, biological methods and ecological methods. Assuming no sewage is discharged, landscape water is mainly subjected to the following main pollution factors: 1. organic matters and nitrogen and phosphorus elements in the surface and soil caused by rainwater surface runoff (the pollution degree of the rainwater on the surface is equivalent to that of domestic sewage); 2. foreign organic matters and nitrogen and phosphorus elements brought by atmospheric dust fall; 3. organic matters accumulated by dead biological communities derived from the lake and the like continuously; 4. the sun exposure in high temperature in summer causes a great amount of blue algae outbreak.
Current methods commonly used for treating landscape water include: physical, biological and chemical methods. The physical method comprises water diversion and water changing, aeration and oxygenation, ultraviolet ray algae removal, sterilization, precipitation and filtration/dirt interception and the like. Although the polluted water body can be replaced by water diversion and water replacement, the water quality is kept clear, the method is high in cost, and the pollution problem is not solved fundamentally. Aeration and aeration can improve the oxygen content of the water body and prevent and treat black and odorous water body, but the operation cost is high. The ultraviolet irradiation has short contact time and high speed, and does not need chemical medicine prick, but the ultraviolet irradiation has no subsequent effect and has high requirement on turbidity. The precipitation filtration/sewage interception method can intercept suspended matters and colloid impurities of smaller particles in water, but the filter can have the phenomena of blockage and cutoff in different degrees after being used for a period of time, so that the treatment effect is gradually reduced.
The chemical method comprises adding copper sulfate, chlorine dioxide, adding chemical air floatation method and coagulating sedimentation method. The addition of copper sulfate and chlorine dioxide has obvious killing effect on algae, bacteria and plankton, but the addition of the copper sulfate and the chlorine dioxide can cause secondary pollution, the algae can generate drug resistance, and the microbial variation and the like are caused. The chemical-adding air floatation method can effectively remove pollutants such as fine suspended particles, algae, solid impurities, phosphate and the like in water, so that the dissolved oxygen in the water is increased, but secondary pollution is caused, and the process flow is complex. The coagulating sedimentation can effectively remove suspended matters and algae in water, is simple and convenient to operate, and has long retention time and slow effect.
The biological method comprises biological contact oxidation, an aeration biological filter, biological agent addition and an aquatic animal and plant system. The biological contact oxidation and aeration biological filter has the advantages of high efficiency, energy conservation, strong impact load resistance and small occupied area, but has the defects of easy sludge expansion and difficult sludge treatment. The water quality can be purified to a certain degree by adding a proper amount of microorganisms, but the decomposition of the microorganisms can cause mass propagation of algae, and the water quality is deteriorated again; the operation cost is high. A set of integrally balanced aquatic animal and plant system is established in the landscape water body, the self-purification capacity of the water body can be improved, but the balance of the whole system is poor, and the change of the surrounding environment can destroy the balance, so that the water quality is deteriorated.
Research shows that insufficient carbon source supplement or unstable supply becomes an important factor for restricting biological denitrification efficiency, and sufficient carbon source can provide sufficient nutrient source for growth and metabolism of microorganisms. Therefore, the solution of the problem of low denitrification efficiency by adding carbon source is becoming a hot point of research in the field of water treatment.
As known from research reports on carbon source supplement, liquid carbon sources such as short-chain organic carbon such as methanol, ethanol, glucose and the like are mainly mature and most widely used, but the problems of high cost, toxicity, uncertain dosage, difficult transportation and the like also lead researchers to start to search and try for additional carbon sources. The hot spots mostly concentrate on how to optimize the traditional carbon source, such as adding a hydrolysis acidification process before a denitrification process, so as to improve the biodegradability and treatment rate of the raw sewage; developing non-traditional carbon sources as carbon sources which can be selected in the denitrification process, such as industrial wastewater, primary sludge hydrolysate, landfill leachate, plant straws and the like. However, these carbon sources have problems such as difficulty in controlling the amount of supply and insufficient supply at the early stage, which affect the metabolism of the microorganism and further the effect of the treatment.
CN 201711392022.7A biodegradable slow-release carbon source filler and its preparation method, the slow-release carbon source filler is composed of an external carbon source layer, an internal carbon source layer, and a connecting colloid, the external carbon source layer mainly comprises biodegradable polymer, starch, and emulsifier; the inner carbon source layer mainly comprises agar powder, oat bran powder, a microbial nutrient, xanthan gum and trehalose; the connecting colloid mainly comprises carbon nano tubes, polyvinylpyrrolidone and methyl cellulose; on the basis of the traditional method for preparing the slow-release carbon source by blending starch and a biodegradable polymer serving as a basic system, the external carbon source is prepared into powder, and the internal carbon source is wrapped in multiple layers by connecting colloids. However, the slow-release carbon source has complex components and high cost.
Based on the above, a slow-release carbon source for landscape water treatment is expected to provide a long-term and stable carbon source and nutrient elements for microorganisms, thereby improving the biological denitrification efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a slow-release carbon source for landscape water treatment and a preparation method thereof. The slow-release carbon source can provide long-term and stable carbon source and nutrient elements for microorganisms, thereby improving the biological denitrification efficiency.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
One aspect of the invention provides a slow-release carbon source for landscape water treatment, which comprises the following raw materials in percentage by weight: 60-80% of polyhydroxyalkanoate, 10-20% of agar, 5-15% of polyethylene glycol, 1-5% of a polymer adhesive, 0.01-0.05% of mineral substances and 0.01-0.05% of vitamins.
Preferably, the polyhydroxyalkanoate density: 1.25g/cm, melt index: 6-8 g/10min (190 ℃/2.16 kg).
Preferably, the polyethylene glycol is selected from one or more of PEG-200, PEG-400, PEG-600 and PEG-800.
Preferably, the polymer adhesive is at least one of polyamides, polyesters and polyurethanes.
Preferably, the vitamin is VB1And/or VB2。
Preferably, the mineral is potassium carbonate and/or magnesium carbonate.
The purpose of the invention and the technical problem to be solved are also realized by adopting the following technical scheme.
In another aspect of the present invention, there is provided a method for preparing a slow-release carbon source for landscape water treatment, comprising the steps of:
weighing polyhydroxyalkanoate, agar, polyethylene glycol, mineral substances and vitamins according to a ratio, fully mixing uniformly, placing in an open mill, controlling the temperature in a double roller of the open mill to be 120-150 ℃, cooling to room temperature after the materials are completely melted, and obtaining a primary filler;
feeding the preliminary filler into a granulator, and performing melt extrusion granulation to obtain particles;
and mixing the particles with the high-molecular adhesive, feeding the mixture into an extruder barrel, and carrying out extrusion forming through an extrusion die to obtain the slow-release carbon source filler.
By the technical scheme, the invention at least has the following advantages: the invention takes the polyhydroxyalkanoate as a main carbon source, makes full use of the properties of the polyhydroxyalkanoate as a carbon source and a storage substance of energy, and simultaneously, the polyhydroxyalkanoate is combined with the agar and the high molecular adhesive, so that the defect of instability of the polyhydroxyalkanoate can be effectively overcome, and the obtained slow-release carbon source energy slowly releases the carbon source and has stable performance. The slow-release carbon source is used for providing carbon sources, minerals, vitamins and other substances for floras in the denitrification process.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
According to the weight portion, 70 portions of polyhydroxyalkanoate (density: 1.25g/cm, melt index: 6-8 g/10min (190 ℃/2.16kg)), 15 portions of agar, 20010 portions of PEG, 0.02 portion of mineral substance (0.01 portion of potassium carbonate + 0.01 portion of magnesium carbonate) and 0.03 portion of Vitamin (VB)10.01 part + VB20.02 portion) and then placed in an open mill after being fully and uniformly mixed, the internal temperature of a double roller of the open mill is 135 ℃, and the mixture is cooled to room temperature after being completely melted, so as to obtain the primary filler. And (3) feeding the preliminary filler into a granulator, and performing melt extrusion granulation to obtain particles. And mixing the particles with 5 parts of polyamide polymer adhesive, feeding the mixture into an extruder barrel, and carrying out extrusion molding through an extrusion die to obtain the slow-release carbon source filler.
Example 2
60 parts of polyhydroxyalkanoate (density: 1.25g/cm, melt index: 6-8 g/10min (190 ℃/2.16kg)), 20 parts of agar, 15 parts of PEG-40015 parts, 0.03 part of mineral (0.02 part of potassium carbonate + 0.01 part of magnesium carbonate) and 0.02 part of Vitamin (VB)10.01 part + VB20.01 portion), fully and uniformly mixing, placing in an open mill, wherein the double-roller internal temperature of the open mill is 120 ℃, and cooling to room temperature after the materials are completely melted to obtain the primary filler. And (3) feeding the preliminary filler into a granulator, and performing melt extrusion granulation to obtain particles. And mixing the particles with 5 parts of polyamide polymer adhesive, feeding the mixture into an extruder barrel, and carrying out extrusion molding through an extrusion die to obtain the slow-release carbon source filler.
Example 3
Respectively weighing 80 parts of polyhydroxyalkanoate (density: 1.25g/cm, melt index: 6-8 g/10min (190 ℃/2.16kg)), 10 parts of agar, 8 parts of PEG-6008, 0.01 part of magnesium carbonate and 0.05 part of Vitamin (VB)10.02 part + VB20.03 portion), fully and uniformly mixing, placing in an open mill, controlling the internal temperature of a double roller of the open mill to be 150 ℃ until the materials are completely melted, and cooling to room temperature to obtain the primary filler. And (3) feeding the preliminary filler into a granulator, and performing melt extrusion granulation to obtain particles. Mixing the particles with 2 parts of polyamide polymer adhesiveMixing, feeding into an extruder barrel, and carrying out extrusion molding through an extrusion die to obtain the slow-release carbon source filler.
Example 4
According to the weight portion, 70 portions of polyhydroxyalkanoate (density: 1.25g/cm, melt index: 6-8 g/10min (190 ℃/2.16kg)), 14 portions of agar, 15 portions of PEG-80015, 0.01 portion of potassium carbonate and VB are respectively weighed10.01 part of the filler, and the mixture is placed in an open mill after being fully mixed, the internal temperature of a double roller of the open mill is 135 ℃, and the filler is cooled to room temperature after the materials are completely melted, so as to obtain the primary filler. And (3) feeding the preliminary filler into a granulator, and performing melt extrusion granulation to obtain particles. Mixing the particles with 1 part of polyamide polymer adhesive, feeding the mixture into an extruder barrel, and carrying out extrusion molding through an extrusion die to obtain the slow-release carbon source filler
Experimental example influence of carbon Source Components on Denitrification Effect and effluent COD
The experimental method comprises the following steps: taking 4 250mL conical flasks, adding 5g of carbon source in examples 1-4 into the 4 conical flasks respectively, adding the acclimatized sludge and test water, replacing 160mL of water distribution every day, controlling the retention time HRT in the reactor to be 24h, controlling the water inflow concentration every day to be 30mg/L, and taking water samples of inlet and outlet water to measure COD and NO3 -The influence of different carbon source components on the denitrification effect and the effluent COD is examined by the water quality indexes, and the results are shown in Table 1.
TABLE 1 influence of different carbon source components on denitrification effect and effluent COD
The results in Table 1 show that the denitrification effect of the carbon source of the present invention is obviously maintained at 95% or more, and the denitrification effect increases with time, and can reach 99.97% at most. In addition, the carbon source can be slowly released, so that COD is maintained in a relatively stable range, and the carbon release phenomenon is relatively obvious.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The slow-release carbon source for landscape water treatment is characterized by comprising the following raw materials in percentage by weight: 60-80% of polyhydroxyalkanoate, 10-20% of agar, 5-15% of polyethylene glycol, 1-5% of a polymer adhesive, 0.01-0.05% of mineral substances and 0.01-0.05% of vitamins.
2. The slow-release carbon source for landscape water treatment according to claim 1, wherein the polyhydroxyalkanoate has a density: 1.25g/cm, melt index: 6-8 g/10min (190 ℃/2.16 kg).
3. The slow-release carbon source for landscape water treatment according to claim 1, wherein the polyethylene glycol is selected from one or more of PEG-200, PEG-400, PEG-600 and PEG-800.
4. The slow-release carbon source for landscape water treatment according to claim 1, wherein the polymer adhesive is at least one of polyamides, polyesters and polyurethanes.
5. The slow-release carbon source for landscape water treatment according to claim 1, wherein the vitamin is VB1And/or VB2。
6. The slow-release carbon source for landscape water treatment according to claim 1, wherein the mineral is potassium carbonate and/or magnesium carbonate.
7. A method for preparing the slow-release carbon source for landscape water treatment as claimed in any one of claims 1 to 6, which comprises the following steps:
weighing polyhydroxyalkanoate, agar, polyethylene glycol, mineral substances and vitamins according to a ratio, fully mixing uniformly, placing in an open mill, controlling the temperature in a double roller of the open mill to be 120-150 ℃, cooling to room temperature after the materials are completely melted, and obtaining a primary filler;
feeding the preliminary filler into a granulator, and performing melt extrusion granulation to obtain particles;
and mixing the particles with the high-molecular adhesive, feeding the mixture into an extruder barrel, and carrying out extrusion forming through an extrusion die to obtain the slow-release carbon source filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN104292781A (en) * | 2013-07-16 | 2015-01-21 | 中国地质大学（北京） | Preparation method of controlled-release carbon source composite particles for use in biological nitrogen removal by denitrification |
| CN106517504A (en) * | 2016-11-22 | 2017-03-22 | 南京大学 | Slow-release carbon source filler as well as preparation method and application thereof |
| CN109160620A (en) * | 2018-11-02 | 2019-01-08 | 江苏中车环保设备有限公司 | One kind being suitable for rural sewage treatment slow release carbon source and preparation method thereof |
| CN109231431A (en) * | 2018-09-13 | 2019-01-18 | 同济大学 | A kind of method of urban water-body original position microorganism remediation |
| EP3604232A1 (en) * | 2018-08-02 | 2020-02-05 | Ulrich Martin | Use of carbonaceous biodegradable polymers for supplying carbon and nutrients to water plants and microorganisms |
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| CN104292781A (en) * | 2013-07-16 | 2015-01-21 | 中国地质大学（北京） | Preparation method of controlled-release carbon source composite particles for use in biological nitrogen removal by denitrification |
| CN106517504A (en) * | 2016-11-22 | 2017-03-22 | 南京大学 | Slow-release carbon source filler as well as preparation method and application thereof |
| EP3604232A1 (en) * | 2018-08-02 | 2020-02-05 | Ulrich Martin | Use of carbonaceous biodegradable polymers for supplying carbon and nutrients to water plants and microorganisms |
| CN109231431A (en) * | 2018-09-13 | 2019-01-18 | 同济大学 | A kind of method of urban water-body original position microorganism remediation |
| CN109160620A (en) * | 2018-11-02 | 2019-01-08 | 江苏中车环保设备有限公司 | One kind being suitable for rural sewage treatment slow release carbon source and preparation method thereof |
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