Cov khoom raug tshem tawm tsis zoo cuam tshuam rau txhua yam ntawm thaj av -raws li industrialized recirculating aquaculture systems. Yog li ntawd, kev tshem tawm cov khoom raug tshem tawm yog lub hom phiaj tseem ceeb ntawm kev kho dej aquaculture recirculating. Nyob rau hauv recirculating aquaculture systems, feem ntau ntawm hais los ntawm loj yog me dua 100 micrometers. Vim yog dej turbulence, biodegradation, thiab mechanical agitation, tshem tawm hais tias tsis tshem tawm tam sim ntawd tuaj yeem tawg mus rau hauv finer suspended hais, feem ntau me dua 30 micrometers. Nyob rau hauv cov xwm txheej no, kev kho sedimentation thiab mechanical filtration ua tsis tau zoo.
Foam fractionation yog ib qho txheej txheem siv los tshem tawm cov khoom uas raug tshem tawm. Nws suav nrog kev qhia huab cua rau hauv lub cev dej, tso cai rau cov surfactants hauv dej kom adsorbed mus rau microbubbles. Cov npuas no, nqa cov khoom adsorbed, nce mus rau saum npoo los ntawm buoyancy los ua npuas dej, yog li tshem tawm cov khoom yaj thiab tshem tawm ntawm cov dej. Tam sim no, ua npuas ncauj fractionation tau lees paub tias yog ib qho ntawm cov txheej txheem tseem ceeb rau kev tshem tawm cov khoom zoo hauv cov txheej txheem aquaculture recirculating thiab yog ib qho tseem ceeb ntawm cov tshuab no.
I. Txoj Cai ntawm Protein Skimmer
1. Txoj Cai Fractionation
Cov protein skimmer ua haujlwm feem ntau raws li lub hauv paus ntsiab lus ntawm kev ua npuas dej. Nyob rau hauv recirculating aquaculture systems, excretions los ntawm kab lis kev cai kab lis kev cai, uneaten pub, thiab lwm yam, muaj ntau cov organic teeb meem. Proteins thiab lwm yam surfactants nyob rau hauv cov organic teeb meem no muaj ib qho amphiphilic xwm (ob leeg hydrophilic thiab lipophilic). Thaum muaj coob tus microbubbles tau nkag mus rau hauv dej, cov tshuaj surfactant adsorb rau ntawm qhov chaw npuas. Thaum cov npuas nce, npuas nrog adsorbed proteins thiab lwm yam khoom tsim ua npuas ncauj txheej ntawm dej. Cov txheej ua npuas dej, muaj qhov ntom ntom ntom ntom, sib cais yooj yim ntawm lub cev dej, yog li tshem tawm cov protein thiab lwm yam khoom organic los ntawm dej.
2. Cov txheej txheem Physicochemical
Los ntawm kev pom microscopic, qhov nro saum npoo muaj nyob nruab nrab ntawm npuas thiab dej. Raws li npuas nce los ntawm cov dej, cov organic molecules nyob rau hauv cov dej aggregate ntawm npuas nto nyob rau hauv lub zog ntawm nto nro. Qhov no yog cov txheej txheem ntawm lub cev adsorption, nrog rau qee qhov kev hloov pauv tshuaj, xws li kev sib cuam tshuam ntawm cov organic molecules thiab tshuaj lom neeg cov tshuaj tiv thaiv nrog npuas nto. Piv txwv li, qee cov protein molecules tuaj yeem raug denaturation, ua rau lawv yooj yim adsorbed rau hauv npuas.
II. Lub luag haujlwm ntawm Protein Skimmers hauv Recirculating Aquaculture
(I) Kev lim dej
1. Kev tshem tawm cov organic teeb meem
Protein skimmers zoo tshem tawm cov organic teeb meem los ntawm dej, suav nrog cov proteins, rog, carbohydrates, thiab lwm yam. Yog tias cov organic tshuaj sib xyaw hauv dej, lawv yuav decomposed los ntawm cov kab mob, siv cov pa oxygen ntau ntau thiab tsim cov khoom tsis zoo xws li ammonia nitrogen thiab nitrite. Tshem tawm cov organics los ntawm cov protein skimmer txo lub nra ntawm cov tshuaj lom neeg tom ntej thiab txo qis cov khoom tsim teeb meem hauv dej. Piv txwv li, yam tsis muaj protein ntau skimmer, tshuaj Chemical Oxygen Demand (COD) hauv dej tuaj yeem nce siab dua 100 mg / L, thaum nrog cov protein skimmer, COD tuaj yeem tswj tau ib ncig ntawm 30 - 50 mg / L.
2. Kev txo qis ntawm Ammonia Nitrogen ntau lawm
Los ntawm kev tshem tawm nitrogen- muaj cov organic teeb meem zoo li cov proteins, cov protein skimmers txo cov peev txheej ntawm ammonia nitrogen hauv dej. Qhov no yog qhov tseem ceeb heev rau kev tswj hwm qhov tsis tshua muaj ammonia nitrogen concentration hauv recirculating aquaculture systems, raws li ammonia nitrogen yog heev lom rau kab mob kab mob.
(II) Kev Txhim Kho ntawm Dej Clarity
Thaum tshem tawm cov organic teeb meem, cov protein skimmers kuj tshem tawm qee qhov raug tshem tawm me dua 30 micrometers, yog li txhim kho cov dej ntshiab, uas muaj txiaj ntsig zoo rau kev loj hlob ntawm kab lis kev cai.
(III) Txo kev kis kab mob
Kev tshem tawm cov kab mob kab mob: Cov teeb meem organic thiab cov khoom raug tshem tawm hauv dej feem ntau ua haujlwm rau cov kab mob, xws li kab mob, kab mob, thiab kab mob cab. Los ntawm kev tshem tawm cov cab no, cov protein skimmer txo lub sijhawm rau cov kab mob sib kis hauv dej, txo qis kev pheej hmoo kis kab mob hauv kab lis kev cai.