CN111392859A - Application method of sulfur autotrophic denitrification biological carrier in anoxic tank - Google Patents
Application method of sulfur autotrophic denitrification biological carrier in anoxic tank Download PDFInfo
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- autotrophic denitrification
- sulfur autotrophic
- denitrification biological
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 69
- 239000011593 sulfur Substances 0.000 title claims abstract description 69
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000945 filler Substances 0.000 claims abstract description 34
- 239000000969 carrier Substances 0.000 claims abstract description 17
- 238000012856 packing Methods 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims description 16
- 238000009826 distribution Methods 0.000 claims description 13
- 239000011148 porous material Substances 0.000 claims description 13
- 239000004793 Polystyrene Substances 0.000 claims description 7
- 229920002223 polystyrene Polymers 0.000 claims description 7
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 4
- 239000004800 polyvinyl chloride Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229920006052 Chinlon® Polymers 0.000 claims description 2
- 239000004677 Nylon Substances 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 30
- 230000000694 effects Effects 0.000 abstract description 12
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000000712 assembly Effects 0.000 abstract description 2
- 238000000429 assembly Methods 0.000 abstract description 2
- 238000013048 microbiological method Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 28
- 239000010865 sewage Substances 0.000 description 21
- 238000010438 heat treatment Methods 0.000 description 14
- 229910052757 nitrogen Inorganic materials 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000000498 ball milling Methods 0.000 description 6
- 235000019738 Limestone Nutrition 0.000 description 5
- 239000006028 limestone Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 3
- 229910052683 pyrite Inorganic materials 0.000 description 3
- 239000011028 pyrite Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 description 1
- 229910000020 calcium bicarbonate Inorganic materials 0.000 description 1
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000019700 dicalcium phosphate Nutrition 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 235000006694 eating habits Nutrition 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
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Classifications
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- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses an application method of a sulfur autotrophic denitrification biological carrier in an anoxic pond, relates to the technical field of water treatment by a microbiological method, and aims to solve a series of problems caused by low mass transfer effect when a sulfur autotrophic denitrification technology is applied, wherein the technical scheme provided by the invention is as follows: filling sulfur autotrophic denitrification biological carriers into the filler unit assemblies to form filler units, wherein n groups of filler units are arranged in each anoxic tank, each group of filler units comprises m filler units, and m and n are positive integers not less than 1; the packing units in the same group are connected in series, and the adjacent packing units are connected with each other through ropes; and fixing each group of filler units at the bottom of the anoxic tank through the filler units connected in series at the head/tail positions, or suspending the filler units on a buoy or a truss, so that the filler units are dispersed in the anoxic tank. The method provided by the invention can greatly improve the denitrification efficiency of the anoxic tank.
Description
Technical Field
The invention relates to the technical field of microbiological water treatment, in particular to an application method of a sulfur autotrophic denitrification biological carrier in an anoxic pond.
Background
In recent years, with the rapid development of economy in China, the development of industrial and agricultural production systems and the rapid improvement of the living standard of people, nutrient elements such as nitrogen and phosphorus discharged into water are increased, a series of problems such as algae outbreak and water quality deterioration are caused, the stability of an aquatic ecosystem is damaged, and the safety of urban water supply and drinking water is seriously influenced. In order to reduce the adverse effect of the sewage discharge after treatment on the water environment quality of the receiving water body, advanced treatment on nitrogen and phosphorus in municipal sewage is urgently needed.
However, the traditional denitrification technology needs to consume a large amount of organic carbon sources, in addition, part of areas are influenced by the dietary habits of residents in China, and the C/N in municipal sewage is generally low, so that the denitrification effect in the anoxic pond with the traditional structure is extremely poor. Aiming at the problem in the current domestic and overseas research, the method for reducing nitrate by using elemental sulfur is mainly concerned, the elemental sulfur can be used as an electron donor under the anoxic or anaerobic condition, nitrate is used as an electron acceptor, and the nitrate is reduced into nitrogen to realize the denitrification process, and the reaction formula is as follows: 55S +20CO2+50NO3 -+38H2O+4NH4 +→4C5H7O2N+25N2+55SO4 2-+64H+. However, in the prior art, biological carriers are generally simply stacked together, and due to the proliferation of microorganisms and the deposition of by-product calcium sulfate, the transfer process of solutes in a solution can be greatly influenced, so that the utilization rate of sulfur-containing materials is reduced; and the anoxic tank has faster water flow, withThe contact time of the materials is short, so that the denitrification effect in the anoxic tank is poor.
Disclosure of Invention
In view of a series of problems caused by low mass transfer effect when the sulfur autotrophic denitrification technology is applied, the invention provides an application method of a biological carrier required by sulfur autotrophic denitrification in an anoxic tank, and solves the problems that the autotrophic denitrification is difficult to apply in the anoxic tank and the total nitrogen exceeds the standard in sewage treatment due to insufficient denitrification carbon source.
The method is suitable for treating the domestic sewage with lower C/N, namely the sewage has lower organic content and higher total nitrogen content. The method can be particularly applied to anoxic structures or anoxic equipment of municipal sewage treatment plants and integrated equipment for dispersed domestic sewage treatment.
In order to achieve the above purpose, the scheme adopted by the invention is as follows:
an application method of a sulfur autotrophic denitrification biological carrier in an anoxic pond comprises the following steps: filling sulfur autotrophic denitrification biological carriers into the filler unit assemblies to form filler units, wherein n groups of filler units are arranged in each anoxic tank, each group of filler units comprises m filler units, and m and n are positive integers not less than 1; the packing units in the same group are connected in series, and the adjacent packing units are connected with each other through ropes; and fixing each group of filler units at the bottom of the anoxic tank through the filler units connected in series at the head/tail positions, or suspending the filler units on a buoy or a truss, so that the filler units are dispersed in the anoxic tank.
The filler units are fixed at the bottom of the anoxic pond or suspended on the buoy or the truss and arranged in a manner of a dot matrix in rows and columns.
In some embodiments of the invention, the packing unit assembly is a spherical reticulated shell, a reticulated bag, or a porous hollow column.
Preferably, the spherical reticulated shell is made of polystyrene, polyvinyl chloride, polyamide, phenolic resin or stainless steel, the aperture of the reticulated shell is not larger than the particle size of the smallest particles in the sulfur autotrophic denitrification biological carriers filled in the reticulated shell, preferably 2-6mm, the diameter of the spherical reticulated shell is 8-12cm, the distance between two adjacent spherical reticulated shells in the same group of filler units is 8-12cm, and the parallel distance L1 between two adjacent groups of filler units on the same row or the same column is 10-40 cm., wherein the volume percentage of the sulfur autotrophic denitrification biological carriers filled in the reticulated shell is 40-70%.
Preferably, the net bag is made of chinlon, the aperture of the net bag is not larger than the particle size of the smallest particles in the sulfur autotrophic denitrification biological carriers filled in the net bag, preferably 4-6mm, the diameter of the net bag is 15-20cm after the biological carriers are filled in the net bag, and the distance L2 between two adjacent groups of net bags on the same row or the same column is 15-40 cm.
Preferably, the porous hollow column is made of polystyrene, polyvinyl chloride, polyamide, phenolic resin or stainless steel, the sum of pore areas accounts for 70-99% of the surface area of the column, the pore diameter is not larger than the particle diameter of the smallest particles in the sulfur autotrophic denitrification biological carrier filled in the column, preferably 4-10mm, the porous hollow column is preferably a cylinder, the diameter of the cross section of the porous hollow column is 8-12cm, and the distance L3 between adjacent porous columns in the same row or the same column is 10-20cm (not the distance between the connecting lines of the centers of the circles of the cylinders, but the distance between the side faces of the cylinders and the nearest position).
Preferably, the rope is a nylon rope. The adjacent packing units in the same group are connected in a detachable mode.
The mode of fixing or suspending each group of packing units is detachable fixing or suspending.
Preferably, the sulfur autotrophic denitrification biological carrier comprises an active carrier and an inert carrier.
Preferably, the active carrier is formed by melting, uniformly mixing and cooling a sulfur element and a common carrier, wherein the sulfur element is from a sulfur source, and the mass ratio of the active carrier to the inert carrier is as follows: 1, the particle diameter of the active carrier and the inert carrier is 5-30mm, and the mass ratio of the sulfur element in the sulfur source to the common carrier is as follows: 0.5-20 mol/g.
Preferably, the source of sulfur comprises one or both of elemental sulfur or pyrite.
Preferably, the common carrier comprises one or more of limestone, silica, bentonite, calcium bicarbonate, calcium hydrogen phosphate, calcium phosphate, zeolite, and Maifanitum; limestone is preferred.
Preferably, the inert carrier comprises one or more of silicon dioxide, titanium dioxide, zirconium dioxide, zeolite, polyurethane and waste bricks.
The common carrier and the inert carrier are both porous structures, have macropores of more than 10um, and have pore volume distribution of more than 70 percent; 2-50 nm mesopores, and the pore volume distribution is more than 10 percent; 600 < SBET＜1600m2/g。
The preparation method of the sulfur autotrophic denitrification biological carrier comprises the following steps: mixing a sulfur source and a common carrier according to a required proportion, ball-milling, carrying out heat treatment under the protection of argon, cooling, and then uniformly mixing with an inert carrier. The ball milling time is 1-5 h; the heating rate of the heat treatment is 10-20 ℃/min, the heat treatment temperature is 150-.
Preferably, the dosage of the biological carrier in the anoxic pond per unit volume is adjusted according to different application conditions, water quality conditions and the like, and the method specifically comprises the following steps:
wherein,
is a safety coefficient of the consumption of the biological carrier and is a constant,
1.1 to 1.4, preferably 1.3;
the reference dosage is a constant of 30-500 kg/m3；
Is the total nitrogen concentration of the inlet water;
the concentration of organic matter in water;
the hydraulic retention time of the anoxic pond is adopted;
time is consumed;
the sludge concentration of the anoxic pond is obtained;
is composed of
Unit concentration of (c).
Advantageous effects
The invention has the beneficial effects that:
the invention not only changes the distribution mode of the sulfur autotrophic denitrification biological carrier in the anoxic tank, but also changes the simple filling of the carrier in a reaction area (or wall) with a certain shape into the dispersion in the anoxic tank through a specific structure, so that the solute transfer process is not influenced, and the maximum utilization of the sulfur-containing material of the biological carrier is realized through the specific parameter setting, the denitrification efficiency of the anoxic tank is greatly improved on the basis of reducing the material consumption, meanwhile, the aim of reducing the whole consumption and volume of the sulfur autotrophic denitrification biological carrier can be realized only on the basis of greatly improving the utilization rate and the denitrification efficiency of the sulfur-containing material, and further, the scheme of dispersing the carrier in the anoxic tank through the specific structure can be adopted, otherwise, the consumption of the sulfur autotrophic denitrification biological carrier is too large and can be used only in a large amount, usually, the alternative method is to fill the whole reaction zone with the nitrogen-removing agent. In addition, limestone is preferably selected as a common carrier in the sulfur autotrophic denitrification biological carrier, so that the pH value in the solution can be better kept constant; the addition of the inert carrier does not reduce the denitrification efficiency due to the reduction of the common carrier, but improves the denitrification efficiency, probably because the addition of the inert carrier increases the microorganism load and the gaps between the common carriers, simultaneously increases the biological attachment area and improves the biological attachment quantity, thereby increasing the utilization rate of a sulfur source, the solute circulation efficiency and the total microorganism quantity. Finally, the invention adopts a specific dosage control method, thereby not only avoiding waste caused by excessive carriers, but also ensuring the highest denitrification efficiency. The anoxic tank is widely applied to domestic sewage treatment, sulfur autotrophic denitrification transformation can be implemented in the conventional anoxic tank, the denitrification efficiency in the sewage treatment process can be greatly improved, and the denitrification cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the distribution of carriers and the inlet and outlet of water in an anoxic tank in the method for applying sulfur autotrophic denitrification biological carriers in the anoxic tank in example 1;
FIG. 2 is the sewage treatment effect data of the method of applying the sulfur autotrophic denitrification biological carrier in the anoxic tank for seven consecutive days according to example 1;
FIG. 3 is a schematic diagram of the distribution of carriers and the inlet and outlet of water in the anoxic tank in the method for applying the sulfur autotrophic denitrification biological carriers in the anoxic tank in example 2;
FIG. 4 is the sewage treatment effect data of the method of applying the sulfur autotrophic denitrification biological carrier in the anoxic tank for seven consecutive days according to example 2.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Preparation example 1 preparation of Sulfur autotrophic Denitrification biological Carrier
Mixing a sulfur source and a common carrier according to a required proportion, ball-milling, carrying out heat treatment under the protection of argon, cooling, and then uniformly mixing with an inert carrier. The ball milling time is 2 h; the heating rate of the heat treatment is 15 ℃/min, the heat treatment temperature is 150 ℃, and the heat treatment time is 20 min.
The sulfur source is pyrite, the common carrier is limestone, and the inert carrier is silicon dioxide. The particle sizes of the common carrier and the inert carrier are 5-10mm, the common carrier and the inert carrier are both porous structures, and have macropores larger than 10um, and the pore volume distribution is larger than 70%; 2-50 nm mesopores, and the pore volume distribution is more than 10 percent; 600 < SBET＜1600m2(ii) in terms of/g. The mass ratio of the common carrier to the inert carrier is as follows: 2:1, the mass ratio of the amount of the sulfur element in the sulfur source to the mass of the common carrier is as follows: 10 mol/g.
Preparation example 2 preparation of Sulfur autotrophic Denitrification biological Carrier
Mixing a sulfur source and a common carrier according to a required proportion, ball-milling, carrying out heat treatment under the protection of argon, cooling, and then uniformly mixing with an inert carrier. The ball milling time is 3 h; the heating rate of the heat treatment is 10 ℃/min, the heat treatment temperature is 200 ℃, and the heat treatment time is 30 min.
The sulfur source is pyrite, the common carrier is limestone, and the inert carrier is silicon dioxide. The particle sizes of the common carrier and the inert carrier are 10-30mm, the common carrier and the inert carrier are both porous structures, and have macropores larger than 10um, and the pore volume distribution is larger than 70%; 2-50 nm mesopores, and the pore volume distribution is more than 10 percent; 600 < SBET＜1600m2(ii) in terms of/g. The mass ratio of the common carrier to the inert carrier is as follows: 3.5:1, the mass ratio of the amount of the sulfur element in the sulfur source to the mass of the common carrier is as follows: 10 mol/g.
Example 1 application of a Sulfur autotrophic Denitrification BioCarrier in anoxic tanks
The example is applied to domestic sewage treatment of a certain district in Beijing, and the sulfur autotrophic denitrification biological carrier prepared in the preparation example 1 is added into the spherical reticulated shell, wherein the addition amount of the biological carrier is calculated according to the following method, and the filling volume percentage of a single spherical reticulated shell is 50%.
The dosage calculation method specifically comprises the following steps:
wherein,
is a safety coefficient of the consumption of the biological carrier and is a constant,
1.3 is selected;
the reference dosage is constant and is 80kg/m3；
Is the total nitrogen concentration of the inlet water;
the concentration of organic matter in water;
the hydraulic retention time of the anoxic pond is adopted;
time is consumed;
the sludge concentration of the anoxic pond is obtained;
is composed of
Unit concentration of (c).
The spherical reticulated shell is made of polystyrene, and the diameter of the spherical reticulated shell is 10 cm.
The specific distribution pattern of the biological carrier in the anoxic pond is schematically shown in figure 1. The distance between every two adjacent strings (groups) of spherical reticulated shells on the same row/column is 20cm, the distance between the spherical reticulated shells on the same string (group) is 10cm, the spherical reticulated shells are hung on the truss, the aperture size of the spherical reticulated shells is 5 mm, the water inlet mode of the anoxic pond adopts the lower part water inlet mode and the upper part water outlet mode.
The sewage treatment effect of the residential area for seven continuous days is shown in figure 2. it can be seen from the figure that after the residential area domestic sewage is treated by the application method, the total nitrogen concentration of the effluent is 0.8-5.1 mg/L, the removal rate of the total nitrogen reaches more than 80%, and the total nitrogen stably reaches the first-class A standard of pollutant discharge Standard of urban Sewage treatment stations (GB 18918-2002).
The pH values of inlet and outlet water are monitored to find that: the pH value of the inlet water is 7.30-8.45, the pH value of the outlet water is 6.90-7.80, and the pH value of the outlet water is not greatly reduced, which indicates that the adopted biological carrier can sufficiently neutralize hydrogen ions, and the proportion of inert carriers and other components in the biological carrier is in a proper range.
Comparative example 1
Application of sulfur autotrophic denitrification biological carrier in anoxic tank
The comparative example is applied to the treatment of domestic sewage in a certain district of Beijing City, and the sulfur autotrophic denitrification biological carrier prepared in the preparation example 1 is added into the spherical reticulated shell, wherein the addition amount of the biological carrier is 200 kg/m3The percentage of the filled volume of the individual spherical reticulated shells was 50%.
The spherical reticulated shell is made of polystyrene, and the diameter of the spherical reticulated shell is 20 cm.
The specific distribution pattern of the biological carrier in the anoxic pond is schematically shown in figure 1. The distance between every two adjacent strings (groups) of spherical reticulated shells on the same row/column is 50cm, the distance between the spherical reticulated shells on the same string (group) is 20cm, the spherical reticulated shells are hung on the truss, the aperture size of the spherical reticulated shells is 5 mm, and the water inlet mode of the anoxic pond adopts the lower part water inlet mode and the upper part water outlet mode.
The effect of sewage treatment is observed for seven consecutive days, and the total nitrogen removal rate is 47 percent. Therefore, the experimental purpose is difficult to achieve without adopting the carrier distribution mode provided by the invention.
Example 2 application of Sulfur autotrophic Denitrification biological Carrier in anoxic tank
The example is applied to an anoxic tank of a certain municipal sewage treatment plant in an inner Mongolia autonomous region, the sulfur autotrophic denitrification biological carrier prepared in the preparation example 2 is added into a porous hollow column, wherein the addition amount of the biological carrier is calculated according to the consumption time of three years by the following method:
wherein,
is a safety coefficient of the consumption of the biological carrier and is a constant,
1.3 is selected;
the reference dosage is constant and is 80kg/m3；
Is the total nitrogen concentration of the inlet water;
the concentration of organic matter in water;
the hydraulic retention time of the anoxic pond is adopted;
time is consumed;
the sludge concentration of the anoxic pond is obtained;
is composed of
Unit concentration of (c).
The porous hollow column is cylindrical, is made of polystyrene, has a cross section diameter of 8cm, and has a total pore area accounting for 85% of the surface area of the column.
The specific layout form of the biological carrier in the anoxic tank is schematically shown in fig. 3, the distance between every two adjacent porous hollow columns on the same row is 15 cm, the distance between every two adjacent porous hollow columns on the same column is 10cm, the pore diameter of each porous hollow column is 10mm, the porous hollow columns are fixed at the bottom of the anoxic tank, and the water inlet mode of the anoxic tank adopts lower water inlet and upper water outlet.
The sewage treatment effect for seven continuous days is shown in figure 4, and it can be seen that after the effluent of the anoxic tank is treated by the application method, the total nitrogen concentration of the effluent is 7.0-15.0 mg/L, the removal rate of the total nitrogen basically reaches over 75 percent, and the effluent stably reaches the first-class A standard of pollutant discharge Standard of urban Sewage treatment stations (GB 18918-2002).
While the preferred embodiments and examples of the present invention have been described in detail, the present invention is not limited to the embodiments and examples, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (9)
1. A method for applying sulfur autotrophic denitrification biological carriers to anoxic ponds is characterized in that the sulfur autotrophic denitrification biological carriers are filled in a filler unit assembly to form filler units, n groups of filler units are arranged in each anoxic pond, each group of filler units comprises m filler units, wherein m and n are positive integers not less than 1, the filler units in the same group are connected in series, adjacent filler units are connected with each other through a rope, each group of filler units are fixed at the bottom of the anoxic pond through the filler units at the head/tail positions of the series connection or hung on a buoy or a truss, so that the filler units are dispersed in the anoxic pond, the filler units are fixed at the bottom of the anoxic pond or hung on the buoy or the truss in a distribution mode in rows and columns, the pore diameter of the reticulated shell is 2-6mm, the diameter of the reticulated shell sphere is 8-12cm, the distance between two adjacent reticulated shells in the same group of filler units is 8-12cm, the parallel distance between two adjacent groups of filler units in the same row or the same column is L1 cm, and the volume percentage of the sulfur autotrophic denitrification biological carriers in the reticulated shell is 70-40%.
2. The method for using the sulfur autotrophic denitrification biological carrier in the anoxic tank according to claim 1, wherein: the packing unit component is a spherical reticulated shell, a reticulated bag or a porous hollow column.
3. The method for using the sulfur autotrophic denitrification biological carrier in the anoxic tank according to claim 2, wherein: the spherical reticulated shell is made of polystyrene, polyvinyl chloride, polyamide, phenolic resin or stainless steel; the aperture of the reticulated shell is not larger than the particle size of the smallest particles in the sulfur autotrophic denitrification biological carrier filled in the reticulated shell.
4. The method for using the sulfur autotrophic denitrification biological carrier in the anoxic tank according to claim 2, wherein: the net bag is made of chinlon, and the aperture of the net bag is not larger than the particle size of the smallest particles in the sulfur autotrophic denitrification biological carrier filled in the net bag.
5. The method for applying the sulfur autotrophic denitrification biological carrier in the anoxic tank according to claim 4, wherein the diameter of the net bag is 4-6mm, the diameter of the net bag filled with the biological carrier is 15-20cm, and the distance L2 between two adjacent net bags on the same row or the same column is 15-40 cm.
6. The method for using the sulfur autotrophic denitrification biological carrier in the anoxic tank according to claim 2, wherein: the porous hollow column is made of polystyrene, polyvinyl chloride, polyamide, phenolic resin or stainless steel; the total area of the holes accounts for 70 to 99 percent of the surface area of the column; the pore diameter is not larger than the particle size of the smallest particles in the sulfur autotrophic denitrification biological carrier filled in the column.
7. The method for applying the sulfur autotrophic denitrification biological carrier in the anoxic pond according to claim 6, wherein the porous hollow column has a pore size of 4-10mm, the porous hollow column is a cylinder with a cross-sectional diameter of 8-12cm, and the distance L3 between adjacent porous columns in the same row or the same column is 10-20 cm.
8. The method for using the sulfur autotrophic denitrification biological carrier in the anoxic tank according to claim 1, wherein: the rope is a nylon rope or a steel wire rope; the adjacent packing units in the same group are connected in a detachable way; the mode of fixing or suspending each group of packing units is detachable fixing or suspending.
9. The method for using the sulfur autotrophic denitrification biological carrier in the anoxic tank according to claim 1, wherein: the sulfur autotrophic denitrification biological carrier comprises an active carrier and an inert carrier; wherein the mass ratio of the active carrier to the inert carrier is as follows: 1, the active carrier mainly comprises sulfur and a common carrier, wherein the mass ratio of the amount of the sulfur to the mass of the common carrier is as follows: 0.5-20mol/g, and the particle size of the active carrier and the inert carrier is 5-30 mm.
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| CN114477443B (en) * | 2022-04-18 | 2022-08-05 | 北京涞澈科技发展有限公司 | Biological frame based inserting plate type baffling anaerobic tank and sewage denitrification method |
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