CN105010215B - Circulating water culture system design device and method based on flow control - Google Patents

Circulating water culture system design device and method based on flow control Download PDF

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CN105010215B
CN105010215B CN201510405900.9A CN201510405900A CN105010215B CN 105010215 B CN105010215 B CN 105010215B CN 201510405900 A CN201510405900 A CN 201510405900A CN 105010215 B CN105010215 B CN 105010215B
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biofilter
day
parameter
flotation tank
water
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CN105010215A (en
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杨景峰
于建华
胡宗福
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Inner Mongolia University for Nationlities
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81Aquaculture, e.g. of fish

Abstract

A kind of circulating water culture system design device and method based on flow control are provided, it first has to set basic parameter according to breed variety, by calculating aquaculture organism system oxygen demand, further according into, it is discharged oxyty, calculate system total flow, calculating machine filter parameter carries out type selecting again, flotation tank volume is calculated again and efficiency carries out type selecting, the parameter type selecting of biofilter is calculated again, biofilter oxygen consumption is obtained according to total ammonia nitrogen yield, further according to this numerical computations air charge, circulating water culture system is carried out modularization decomposition by the present invention, user can be according to aquaculture organism feature and local environment feature, determine the parameter of each module, corresponding module is produced by Design of Industrial Enterprises, the method structure circulating water culture system of user's assembling, facilitate its operation and maintenance.

Description

Circulating water culture system design device and method based on flow control
Technical field
The present invention relates to aquacultural engineering technical field, more particularly to a kind of circulating water cultivation based on flow control System design device and method.
Background technology
The core of circulating water cultivation be circulating water culture system (Recirculation aquaculture systems, RAS), RAS is the formula factory aquaculture system that has the function of breeding water purified treatment and can be recycled, special Sign is by the way that each metabolic waste generated in breeding process is removed or is degraded, and recycled the methods of physics, chemistry, biology It utilizes.RAS is a kind of high-density cultivation system, and respectively processing of the component to breeding water is respectively made up of system, at most can be with It is recycled the 90-99% of breeding water, this makes it possible accurately to control breeding environment and water quality parameter, so as to reach Best cultivating condition.
But circulating water culture system is big etc. there is also design complexity, cost height, operation cost height, operation management difficulty Restraining factors.In addition, water cycle also leads to higher power cost, and water reuse ratio it is higher, corresponding cost increase It is more.
In general, RAS includes aquaculture pond, mechanical filter, biofilter, water pump system and control causal organism The component parts such as disinfection apparatus.Since RAS designs extremely complex, only a small number of R&D institutions both at home and abroad and enterprise can be at present A full set of circulating water culture system design is provided.But since cultivation unit personnel lacks the circulating water cultivation knowwhy of system, User is difficult to understand various equipment and the functional characteristics of facility, and Operation and Maintenance difficulty is big, and since circulating water cultivation is high density Intensive culture, once there is equipment operation failure, caused by loss it is very big.
Invention content
For current RAS operation costs it is high the problem of, the present invention proposes that method based on flow control carries out system design, Water circulating consumption is utmostly reduced, is cut operating costs;It is not easy to grasp for system design, operating difficulties, existing design side The problems such as method is cumbersome provides a kind of circulating water culture system design device and method based on flow control, with modularization Design, parameter designing is easy, and calculating process is succinct, easy to operation.Circulating water culture system is subjected to modularization decomposition, Yong Huke According to aquaculture organism feature and local environment feature, to determine the parameter of each module, corresponding module produced by Design of Industrial Enterprises, The method structure circulating water culture system of user's assembling.Since user clearly respectively forms partial function, feature, it is also convenient for its operation And maintenance.
Circulating water culture system design device includes system using the selection designing method based on flow control, computing device Oxygen supply and flow parameter computing device, mechanical filter parameter calculation apparatus, flotation tank parameter calculation apparatus, biofilter ginseng Number computing device;Cultivation basic parameter is determined according to cultivation characteristic first, basic parameter value is inputted on device, first passes through system Oxygen supply and flow parameter computing device, then by mechanical filter device, then by flotation tank parameter calculation apparatus, finally by Biofilter parameter calculation apparatus calculates respective relevant parameter respectively.
Type selecting device working procedure is:
Step 1: determining basic parameter, first have to according to breed variety and ability setting RAS controls temperature, maximum cultivation Then density, cultivation fish average weight, the aquaculture pond depth of water, the aquaculture pond gross area calculate breeding water body total volume, maximum biology Amount, maximum biomass, the bait situation setting finally fed according to breed variety and plan feed rate, calculate day maximum and feed Amount;
Step 2: computing system oxygen supply and flow parameter, are joined by maximum biomass and aquaculture organism unit respiratory rate Number calculates aquaculture organism system oxygen demand, further according to water-in and water-out oxyty, calculates system total flow;
Step 3: calculating machine filter parameter, is estimated that according to aquaculture organism digestibility and maximum day feeding volume Day solid waste yield (PSS), go out solid waste further according to system total flow and day solid waste Production rate and be averaged day concentration, Mechanical filter concentration index and suitable mechanical filtration efficiency are estimated, so as to carry out type selecting to mechanical filter;
Step 4: calculating flotation tank parameter, can be calculated in flotation tank residence time according to system total flow and estimation water Go out air supporting pond body product, obtain needing flotation tank according to solid waste yield is removed the day of day solid waste yield and mechanical filter The amount of solid of removal obtains flotation tank efficiency parameters, so as to carry out type selecting to flotation tank volume and efficiency;
Step 5: calculating biofilter parameter, flotation tank is subtracted according to bait day feeding volume and mechanical filter removes Amount of solid the yield of total ammonia nitrogen (TAN) is calculated in conjunction with the nitrogen content in protein content, protein in bait (PTAN), a day amount of makeup water is calculated further according to estimation day maximum the concentration of nitrate nitrogen, is obtained often in conjunction with the concentration of water outlet total ammonia nitrogen The amount of TAN that day biofilter needs convert, further according to expected rate of nitrification RNCalculate required nitrification area SN, Biofilter material volume V is obtained further according to the biofilter material specific surface area of selectionBiofilm, and biofilter oxygen consumption according to Total ammonia nitrogen yield obtains, then can be according to this numerical computations air charge.
Circulating water culture system designs device, and basic parameter and industry experience value parameter are manually entered in device interface: Breed variety, temperature of cultivation, highest cultivation density, cultivation fish average weight, the aquaculture pond depth of water, the aquaculture pond gross area, maximum are supported It grows quantity, feed rate, aquaculture pond into water-soluble oxygen, aquaculture pond go out water-soluble oxygen, solid waste estimates percentage, mechanical filter effect Protein content, cultivation water TAN concentration, cultivation water maximum nitre in rate, air-flotation process time, air supporting solids removal rate, feed Sour nitrogen concentration, estimated rate of nitrification, filtrate specific surface area, filtrate depth after input unit, are equipped with formula operation list in device Member, through operation output result be culturing pool volume, maximum biomass, maximum cultivate quantity, day maximum feeding volume, aquaculture organism Oxygen demand, flow system flow, solid waste yield, mechanical filter filter capacity, total solid matters averagely flow into concentration, total solid Object highest flows into concentration, total solid matters aqueous concentration, total solid matters mechanical filter removal amount, flotation tank volume, air supporting solid Object removal amount, TAN yields, system amount of makeup water, TAN biofiltrations removal amount, required nitrification area, filtrate volume, filter Expect occupied area, biofilter oxygen demand, mechanical filter, air supporting can be completed to circulating water culture system according to these results Pond, the Selection and Design of biofilter.
Using the selection method based on flow control, that is, first pass through the first computing system oxygen supply of basic parameter and flow ginseng Number, aquaculture organism system oxygen demand is calculated by maximum biomass and aquaculture organism unit respiratory rate parameter, further according into, Oxyty is discharged, machine calculation system total flow calculates mechanical filter, flotation tank, biological mistake according to system total flow later The parameter of filter and type selecting.
Its theoretical calculation method is as follows:
Basic parameter determines, first has to be put down according to breed variety setting RAS controls temperature, maximum cultivation density, cultivation fish The parameters such as equal weight, the aquaculture pond depth of water, the aquaculture pond gross area is determined according to cultivation ability, then calculates breeding water body totality Product, the parameters such as maximum biomass (BM), maximum biomass, the bait situation finally fed according to breed variety and plan, which is set, throws The rate of feeding, calculates day maximum feeding volume.
System supplies oxygen and flow parameter determines, the oxygen consumption in aquaculture pond is mainly spontaneous nitre in aquaculture organism oxygen consumption and water Change acts on oxygen consumption, and under the premise of the nitrification oxygen consumption in aquaculture pond is ignored, in order to ensure that dissolved oxygen in water is supplied, flow system flow can To be calculated by following formula:
In formula:QS--- flow system flow, L/day;RDOfsih--- aquaculture organism oxygen total flow, kg/day;CDOinInto Water-soluble oxygen concentration, mg/L;CDOout--- water outlet oxyty, mg/L.
Water inlet dissolved oxygen height determines aquaculture pond dissolved oxygen deliverability, and under normal circumstances, which is set in 14mg/L (28 DEG C, 200% saturation degree), if desired for higher oxygen supply amount, need to use pure oxygen as oxygen supply source.CDOoutFor cultivation Dissolved oxygen in water concentration after fish breathing, theoretically, it can be provided cultured fishes minimum requirements oxyty, however, to ensure that Fish fast-growth, the value cannot set too low, be generally located in more than 5mg/L (28 DEG C, 70% saturation degree).
Aquaculture organism oxygen demand can be calculated simply by unit respiratory rate and aquaculture organism amount:
RDofish=Rfish×BM×24×10-6 (2)
In formula:Rfish--- aquaculture organism unit respiratory rate, mg/ (kgh);BM --- system maximum biomass, kg;
Wherein aquaculture organism unit consumption rate can be determined according to the Biological characteristics of aquaculture organism.
Mechanical filter parameter determines that mechanical filter can remove the solid waste being made of in RAS residual bait and excrement, High quality can only leave few residual bait with feed, and the quantity of excrement is determined by aquaculture organism digestibility, and general cooperation is raised Material can form 20%~40% solid waste, can calculate a day solid according to this ratio and maximum day feeding volume and give up Produce amount (PSS).Total solids concentration into mechanical filter is:
In formula:CSSin--- mechanical filter enters horizontal equal solids concentration, mg/L;PSS--- solids total output, kg/ day;QS--- flow system flow.
Since RAS cultivates feature, solids mainly concentrates generation in bait throwing in and after digestion, it is believed that solids is concentrated Generation time is 4h, therefore when determining mechanical filter parameter, and maximum water inlet SS concentration cannot be below 6 times of mean concentration. According to parameters such as above-mentioned flows, mechanical filter type selecting is carried out, and according to the filter efficiency of mechanical filter, it can be with calculating machine The solids removal amount of filter:
RMSS=PSS×EMSS (4)
In formula:RMSS--- mechanical filter solids removal amount, kg/day;EMSS--- mechanical filter efficiency, %.
Flotation tank parameter determines that the tiny solid object that mechanical filter cannot remove can be by Protein Skimmer, gas The equipment such as floating pond further remove, and flotation tank is discussed herein primarily.Pneumatically supported effect depends on the diameter of bubble, solid and gas liquid Than the factors such as solid surface activity substance.According to flotation tank design requirement, the available depth of flotation tank generally takes 2.0~2.5m, The flow residence time is generally 10~20min in pond;The required volume of flotation tank can be calculated:
In formula:VFoam--- flotation tank volume, m3;tFoam--- water is in air supporting residence time, min.
Flotation tank can generally remove 30%~80% solids, can calculate air supporting according to the efficiency of flotation tank Pond removes the amount of solids:
RFSS=(PSS-RMSS)×EPSS (6)
In formula:RFSS--- air supporting solids removal amount, kg/day;EFSS--- flotation tank removal efficiency, %.
Biofilter parameter determines that biofilter is the core of RAS, and function is will to be generated during cultivation Total ammonia nitrogen (TAN) decompose, from biofilter flow out water in ammonia-nitrogen content reach breeding water requirement.Ignoring fish nitrogen Under the premise of assimilation, the yield of total ammonia nitrogen can be represented by Percent protein in feed:
PTAN=(FA-RMSS-RFSS) × PC × 6.5% (7)
In formula:FA --- bait day feeding volume, kg/day;PC --- protein content in bait, %;6.5% --- egg Nitrogen content in white matter.
TAN in water is converted into nitrate, in order to which amount of makeup water can be by following formula by biofilter by nitrification It calculates:
In formula:Q --- amount of makeup water, L/day;NMax--- maximum the concentration of nitrate nitrogen, mg/L.
Supplement water will be warming up to cultivating system set temperature, thus the amount for supplementing water determines the consumed energy that heats up, Supplement requirement is low as possible, and the 10% of general no more than system total Water.Maximum the concentration of nitrate nitrogen is the nitrate nitrogen upper limit in system, It can be given birth to according to fish and the tolerance degree of nitrate nitrogen is set, generally could be provided as 150~200mg/L.It is dense to be discharged total ammonia nitrogen Degree is determined that most of fish settings are all safe to 1.8~2.0mg/L, and biofilter is daily by cultured fishes tolerance level Needing the amount of the TAN converted can be calculated by following formula:
RTAN=PTAN-Cout×Q×10-6 (9)
In formula:RTAN--- the total ammonia nitrogen amount removed daily, kg/day;Cout--- the concentration of water outlet total ammonia nitrogen, mg/L.
Biofilter is made of porous biofilter material, the hole on biofilter material be nitrification place, nitrification Area can be calculated with following formula:
In formula:SN--- required nitrification area, m2;RN--- it is expected that rate of nitrification, g/ (m2·day)。
Rate of nitrification and system water temperature are directly proportional, and range is from 0.15 to 1g/ (m2Day), most of RAS can reach 0.5g/(m2·day).The specific surface area numerical value of a variety of different biofilter materials is different, and range is in 100~300m2/m3Between, it is raw The volume of object filter can be calculated by following formula:
In formula, VBiofilm--- biofilter material volume, m3;S --- filtrate specific surface area, m2/m3
The nitration reaction process oxygen demand carried out in biofilter is very big, according to basic biochemistry reaction equation, often The TAN of 1g, which is oxidized to nitrate, needs the oxygen of oxygen consumption 4.57g.Thus biofilter oxygen consumption can be by following formula meter It calculates:
RBNOD=RTAN×4.57 (12)
Biofilter-as using air blower using air oxygenation, be carried out at the same time aeration, can be according to this numerical computations Air charge.
According to above-mentioned theoretical calculation method, electronic software is designed, for example pressed in electrical form interface by respective formula Cultivation and design experiences determine partial parameters, finally determine systematic parameter.In electrical form, the finger being manually entered will be denoted as After marking relevant parameter input, you can other relevant parameters are calculated, and when input parameter changes, relevant parameter is counted automatically Calculate variation.The composition parts such as mechanical filter, comprehensive flotation tank, biofilter, disinfection oxygenation pond are designed in systems, according to Process flow chart finally determines designing scheme.
1 circulating water culture system parameter designing table of table
Note:* the letter in bracket represents the row number being listed in electrical form;
* gauge outfits occupy the first and second rows;
The formula involved in digitized representation text in * * brackets.
Description of the drawings
Fig. 1:Circulating water culture system designs schematic device
Fig. 2:Circulating water culture system process flow chart
Specific embodiment
The design of one complete circulation of progress is illustrated how with specific embodiment:
Data collection and basic parameter determine:
For designing a set of Cynoglossus semilaevis circulating water culture system, it is 60kg/m to design maximum cultivation density3, listing rule Lattice are determined as averagely per tail 1500g.Electrical form shown in relevant parameter input table 1, calculates other parameter automatically.
According to Cynoglossus semilaevis Biological characteristics, the aquaculture pond depth of water is designed as 0.5m.The breeding water body of system can be according to building If place situation designs, can also be calculated with expected volume and maximum cultivation density.According to place is built in this example, it is set as 1280m2, therefore the cultivation water scale of construction of system is 640m3
Circulating water culture system maximum cultivation density can reach 100kg/m3More than, it is contemplated that Cynoglossus semilaevis cannot be abundant Using Water space, maximum cultivation density is designed as 60kg/m2, system maximum cultivation amount is 38400kg.The system is intended plan and is supported The big specification adult fishes of more than 500g are grown, go out pond specification plan for 1500g/ tails, whole system can cultivate about 25600 tails.
According to cynoglossus semilaevis cultivation feature, it is 0.8% to draft and feed rate day, and maximum day feeding volume is 307.20kg/day.
Calculate circulating water culture system flow:
55mg/ (kgh) is set as according to the consumption rate of Cynoglossus semilaevis, the oxygen that fish are calculated according to formula (2) disappears Consumption is 50.69kg/day.If being 16mg/L into water-soluble oxygen, go out water-soluble oxygen for 7mg/L, calculated according to formula (1) to meet Oxygen supply demand, minimum water flow are 6532000L/day, i.e. 3911.11L/min.
Final design operating parameter 4000L/min, highest can reach 6000L/min.
Mechanical filter parameter calculates:
Feed becomes solid waste estimation percentage and is set as 25%, according to feedstuff feeding amount, will generate solid waste 76.80kg/day according to formula (3), calculates water-outlet body solids and averagely flows into as 13.64mg/L, peak concentration can reach 81.82mg/L.It is assumed that mechanical filter efficiency is 60%, mechanical filter can be calculated according to formula (4) and can remove 30.72kg/day is discharged a concentration of 8.18mg/L of overall object.
By indexs such as water flows, finally determining mechanical filter is by maximum processing capability 360m3/ h, maximum water inlet solids Concentration 100mg/L, highest water outlet solids concentration 8mg/L, treatment effeciency are designed type selecting not less than 60%.
Comprehensive flotation tank parameter calculates:
This example uses dispersed-air floatation pond, and by flotation tank design requirement, the air-flotation process time cannot be below 10min, air supporting It handles elevation and is not less than 2.5m.By formula (5), flotation tank minimum volume can be calculated.It is assumed that flotation tank treatment effeciency is 30%, the amount that air supporting removal solids can be calculated according to formula (6) is 13.82kg/day.
Final comprehensive flotation tank is not less than 30% by water total solid matters 10mg/L, processing time 10min, treatment effeciency is flowed into It is designed into every trade.
Biofilter parameter calculates:
Cynoglossus semilaevis adult fish culture need to feed the mixed feed of more than 50% protein content, calculated by formula (7) and be TAN total outputs of uniting are 8.54kg/day.Total ammonia nitrogen control contains within 1.00mg/L keeping system nitric nitrogen in aquaculture pond Amount is not higher than 150mg/L hereinafter, being 56908.80L/day, i.e., about 57m according to the rate of water make-up of formula (8) computing system3/day。
By formula (9), biofilter TAN removal amounts are calculated as 8.48kg/day.Biofilter rate of nitrification is about For 0.1~1.0g/ (m2Day), this programme is set to 0.4g/ (m2Day), biofilter material material determines specific surface area, this programme Plan is 200m with specific surface area2/m3Filtrate can calculate area needed for biofiltration as 21198.53m automatically2(formula 10), body Product is 105.99m3(formula 11).If biofilter elevation is set as 2.5m, the area of biofilter needs to occupy 42.40m2
Total oxygen demand that biofilter is calculated according to formula (12) is 38.75kg/day.
Finally determining biofilter parameter:Biofilter material volume is no less than 120m3, specific surface area be not less than 200m2/m3、 Processing water flow reaches flow system flow requirement, dissolved oxygen content is not less than 40kg/day.
Other parameter calculates:
Water circulating pump parameter:With 2 for 1, meet operation not less than 4000L/min, highest is not less than 6000L/min recycle streams Amount requirement.
Sterilization pool parameter:Reach Disinfection Effect.
Oxygenation parameter:Not less than the requirement of pure oxygen 50.69kg/day solvabilities.
Temperature control parameter:19 ± 2 DEG C of system water temperature.
The master-plan and lectotype selection of scheme are finally carried out according to above-mentioned parameter, completes whole circulating water cultivation cultivation system The construction of system.System passes through operation test, can reach design standard.
Although compareing above preferred embodiment, embodiment of the present invention is described, the present invention does not limit to In above-mentioned specific embodiments and applications field, the embodiment above is only schematical, directiveness rather than restricted 's.Those skilled in the art is under the enlightenment of specification, in the ambit for not departing from the claims in the present invention and being protected Under, many simple variations can also be made, these belong to the row of protection of the invention.

Claims (2)

1. a kind of circulating water culture system designs device, which is characterized in that it uses the selection designing method based on flow control, Computing device includes system oxygen supply and flow parameter computing device, mechanical filter parameter calculation apparatus, and flotation tank parameter calculates Device, biofilter parameter calculation apparatus;Cultivation basic parameter is determined according to cultivation characteristic first, is inputted on device basic Parameter value first passes through system oxygen supply and flow parameter computing device, then carries out calculating parameter, then lead to by mechanical filter device Flotation tank parameter calculation apparatus is crossed, finally by biofilter parameter calculation apparatus;
Type selecting device working procedure is:Step 1: determining basic parameter, first have to according to breed variety and ability setting RAS controls Then temperature processed, maximum cultivation density, cultivation fish average weight, the aquaculture pond depth of water, the aquaculture pond gross area calculate breeding water body Total volume, maximum biomass, maximum biomass, the bait situation setting finally fed according to breed variety and plan feed rate, Calculate day maximum feeding volume;Step 2: computing system oxygen supply and flow parameter, pass through maximum biomass and aquaculture organism unit Respiratory rate parameter calculates aquaculture organism system oxygen demand, further according to water-in and water-out oxyty, calculates system total flow; Step 3: calculating machine filter parameter, estimates day solid waste according to aquaculture organism digestibility and maximum day feeding volume and produces Amount goes out solid waste further according to system total flow and day solid waste Production rate and is averaged day concentration, estimates mechanical filter Concentration index and suitable mechanical filtration efficiency, so as to carry out type selecting to mechanical filter;Step 4: flotation tank parameter is calculated, According to system total flow and estimation water calculate flotation tank volume in flotation tank residence time, according to day solid waste yield with And the day removal solid waste yield of mechanical filter obtains the amount of solid that flotation tank is needed to remove, and obtains flotation tank efficiency parameters, So as to carry out type selecting to flotation tank volume and efficiency;Step 5: calculating the parameter of biofilter, subtracted according to bait day feeding volume The amount of solid that flotation tank and mechanical filter remove is gone to be calculated in conjunction with the nitrogen content in protein content, protein in bait The yield Ptan of total ammonia nitrogen calculates a day amount of makeup water, in conjunction with the total ammonia of water outlet further according to estimation day maximum the concentration of nitrate nitrogen The concentration of nitrogen obtains the amount of TAN that daily biofilter needs convert, and is calculated further according to expected rate of nitrification RN required Nitrification area SN obtains biofilter material volume V further according to the biofilter material specific surface area of selectionBiofilm, and biofiltration Device oxygen consumption is obtained according to total ammonia nitrogen yield, further according to this numerical computations air charge;
Wherein system water flow QSIt is calculated by following formula:QS=RDOfish/[(CDOin-CDOout)×10-6], RDOfishFor oxygen wastage in bulk or weight Amount, CDOinFor oxyty of intaking, CDooutTo be discharged oxyty;Aquaculture organism oxygen demand is exhaled simply by aquaculture organism unit It inhales rate and aquaculture organism amount is calculated:RDOfish=Rfish×BM×24h/day×10-6, RfishIt is exhaled for aquaculture organism unit Rate is inhaled, BM is system maximum biomass;The total solids concentration of mechanical filter is:CSSin=PSS×106/QS, CSSinFor machine Tool filter enters horizontal equal solids concentration, PSSFor solids total output;RMSS=PSS×EMSS, RMSSFor mechanical filter solid Object removal amount, EMSSFor mechanical filter efficiency;According to flotation tank design requirement, the available depth of flotation tank takes 2.0~2.5m, The flow residence time is 10~20min in pond;Calculate the required volume of flotation tank:VFoam=tFoam×QS/(1.44×10-6), VFoamFor flotation tank volume;The solids of flotation tank removal 30%~80%, according to the efficiency of flotation tank, calculates air supporting Pond removes the amount of solids:RFSS=(PSS-RMSS)×EFSS, RFSSFor air supporting solids removal amount, EFSSIt removes and imitates for flotation tank Rate;Biofilter parameter determines that the yield of total ammonia nitrogen is represented by Percent protein in feed:PTAN=(FA-RMSS- RFSS) × PC × 6.5%, PTAN are system total ammonia nitrogen yield, and FA is bait day feeding volume, and PC is protein content in bait, 6.5% is nitrogen content in protein;TAN in water is converted into nitrate, in order to reduce by biofilter by nitrification Nitrate nitrogen in system need to supplement water to system, and amount of makeup water Q is calculated by following formula:Q=PTAN×106/NMax, NMaxFor maximum nitre Sour nitrogen concentration;Maximum the concentration of nitrate nitrogen is set as 150~200mg/L, is discharged total ammonia nitrogen concentration CoutIt sets to 1.0~2.0mg/ L, biofilter need the T converted dailyANAmount calculated by following formula:RTAN=PTAN-Cout×Q×10-6;Nitrification area It is calculated with following formula:SN=RTAN×103/RN, RNFor expected rate of nitrification, range is from 0.15~1g/m2Day, it is most of RAS reaches 0.5g/m2·day;The specific surface area S numerical value of a variety of different biofilter materials is different, and range is in 100~300m2/m3 Between;The volume of biofilter is calculated by following formula:VBiofilm=SN/S;The nitration reaction mistake carried out in biofilter Journey oxygen demand is very big, and according to basic biochemistry reaction equation, the TAN per 1g, which is oxidized to nitrate, needs the oxygen of oxygen consumption 4.57g, Thus biofilter oxygen consumption is calculated by following formula:RBNOD=RTAN× 4.57, RBNODFor biofilter oxygen demand, biology Filter is oxygenated using air, aeration is carried out at the same time, according to this numerical computations air charge.
2. a kind of circulating water culture system design method, which is characterized in that it uses the selection method based on flow control, i.e., first It is supplied oxygen by basic parameter come first computing system and flow parameter, passes through maximum biomass and aquaculture organism unit respiratory rate is joined Number calculates aquaculture organism system oxygen demand, further according to water-in and water-out oxyty, calculates system total flow, later according to being Unite total flow calculate mechanical filter, flotation tank, biofilter parameter and type selecting;
It uses the selection method based on flow control, Step 1: determining basic parameter, first has to according to breed variety and ability RAS controls temperature, maximum cultivation density, cultivation fish average weight, the aquaculture pond depth of water are set, then the aquaculture pond gross area calculates Go out breeding water body total volume, maximum biomass, maximum biomass is finally set according to breed variety and the bait situation for intending feeding Surely rate is fed, calculates day maximum feeding volume;Step 2: computing system oxygen supply and flow parameter, by maximum biomass and are supported It grows biological units respiratory rate parameter and calculates aquaculture organism system oxygen demand, further according to water-in and water-out oxyty, calculate and be System total flow;Step 3: calculating machine filter parameter, estimates and consolidates day according to aquaculture organism digestibility and maximum day feeding volume Body waste production PSS goes out solid waste further according to system total flow and day solid waste Production rate and is averaged day concentration, estimates Mechanical filter concentration index and suitable mechanical filtration efficiency, so as to carry out type selecting to mechanical filter;Step 4: calculate gas Floating pond parameter calculates flotation tank volume, according to day solid according to system total flow and estimation water in flotation tank residence time The day of waste production and mechanical filter removal solid waste yield obtains the amount of solid that flotation tank is needed to remove, and obtains flotation tank Efficiency parameters, so as to carry out type selecting to flotation tank volume and efficiency;Step 5: the parameter of biofilter is calculated, according to bait Day feeding volume subtracts the amount of solid of flotation tank and mechanical filter removal in conjunction with the nitrogen in protein content, protein in bait Content meter calculates the yield Ptan of total ammonia nitrogen, and a day amount of makeup water is calculated, then tie further according to estimation day maximum the concentration of nitrate nitrogen The concentration for closing water outlet total ammonia nitrogen obtains the amount of TAN that daily biofilter needs convert, further according to expected rate of nitrification RN meters Nitrification area SN needed for calculating, biofilter material volume is obtained further according to the biofilter material specific surface area of selection VBiofilm, and biofilter oxygen consumption is obtained according to total ammonia nitrogen yield, is filled further according to this numerical computations air Enter amount;
Wherein system water flow QSIt is calculated by following formula:QS=RDOfish/[(CDOin-CDOout)×10-6], RDOfishFor oxygen wastage in bulk or weight Amount, CDOinWater inlet oxyty, CDooutTo be discharged oxyty;Aquaculture organism oxygen demand is breathed simply by aquaculture organism unit Rate and aquaculture organism amount are calculated:RDOfish=RDOfish×BM×24h/day×10-6, RfishIt is exhaled for aquaculture organism unit Rate is inhaled, BM is system maximum biomass;The total solids concentration of mechanical filter is:CSSin=PSS×106/QS, CSSinFor Mechanical filter enters horizontal equal solids concentration, PSSFor solids total output;RMSS=PSS×EMSS, RMSSConsolidate for mechanical filter Body object removal amount, EMSSFor mechanical filter efficiency;According to flotation tank design requirement, the available depth of flotation tank takes 2.0~ 2.5m, the flow residence time is 10~20min in pond;Calculate the required volume of flotation tank:VFoam=tFoam×QS/(1.44 ×106), VFoamFor flotation tank volume;The solids of flotation tank removal 30%~80% according to the efficiency of flotation tank, calculates outlet The amount of floating pond removal solids:RFSS=(PSS-RMSS)×EFSS, RFSSFor air supporting solids removal amount, EFSSIt removes and imitates for flotation tank Rate;Biofilter parameter determines that the yield of total ammonia nitrogen is represented by Percent protein in feed:PTAN=(FA-RMSS- RFSS) × PC × 6.5%, PTANFor system total ammonia nitrogen yield, FA is bait day feeding volume, and PC is protein content in bait, 6.5% is nitrogen content in protein;TAN in water is converted into nitrate, in order to reduce by biofilter by nitrification Nitrate nitrogen in system need to supplement water to system, and amount of makeup water Q is calculated by following formula:Q=PTAN×106/NMax, NMaxFor maximum nitre Sour nitrogen concentration;Maximum the concentration of nitrate nitrogen is set as 150~200mg/L, water outlet total ammonia nitrogen concentration C out settings to 1.0~2.0mg/ L, biofilter need the amount of the TAN converted to be calculated by following formula daily:RTAN=PTAN-Cout×Q×10-6;Nitrification area It is calculated with following formula:SN=RTAN×103/RN, RNFor expected rate of nitrification, range is from 0.15~1g/m2Day, it is most of RAS reaches 0.5g/m2·day;The specific surface area S numerical value of a variety of different biofilter materials is different, and range is in 100~300m2/m3 Between;The volume of biofilter is calculated by following formula:VBiofilm=SN/S;The nitration reaction mistake carried out in biofilter Journey oxygen demand is very big, and according to basic biochemistry reaction equation, the TAN per 1g, which is oxidized to nitrate, needs the oxygen of oxygen consumption 4.57g, Thus biofilter oxygen consumption is calculated by following formula:RBNOD=RTAN× 4.57, RBNODFor biofilter oxygen demand, biology Filter is oxygenated using air, aeration is carried out at the same time, according to this numerical computations air charge.
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