Tgp chi Khoa hoc Tni&ngDgi hgc Cdn Dio Phdn 4 Khoahgc Tunhien Cong nglie vd Moi tnr&ng'''' 29 (20!3j 31 36 Tap chi Khoa hoc Tri/dng Oai hoc Can Thci ''''•''''^^''''^'''' website sj ctu edu vn VAI TRO CUA BON BON TRO[.]
Tgp chi Khoa hoc Tni&ngDgi hgc Cdn Dio Phdn 4: Khoahgc Tunhien Cong nglie vd Moi tnr&ng' 29 (2 Tap chi Khoa hoc Tri/dng Oai hoc Can Thci '•'^^'^' website: sj.ctu.edu.vn VAI TRO CUA BON BON TRONG HE THONG DAT NGAP NlTdC KIEN TAO Xtr LY Nl/dC THAI AO NUOI CA TRA THAM CANH TUAN HOAN KIN Lam Thi My Nhien^ va Ngo Thuy Diem Trang^ ' Phdng Tdi nguyin vd Mdi trudng thdnh phd Sdc Trdng tinh Sdc Trdng - Khoa Mdi trudng & Tdi nguyin Thien nbien, Trudng Bai hgc Cdn Tha Thong tin chung: Ngd}- nhdn: 23 05/2013 Ngdy chdp nhan: 24 12/2013 Title: The role ofTypha orientalis in constructed wetlands for treatment close-recirculated intensive catfish culture Tir khoa: Bdn bdn, cd Tra ddt ngdp nudc kiin tgo, dgm, ldn, xu ly bdng thuc vdt Keywords: Typha orientalis L., Pangasianodon hypoplithalmus, consti-ucted wetlands, nitrogen, phosphorus, phvtoremedialion ABSTRACT The purpose of the study was to evaluate treatment performance oj vegetated and unvegetated horizontal sub-surface flow in constructed wetlands in purifying intensive catfish waste-water The re-growth ability of Typha orientalis L , its biomass and nutrient uptake were determined in this study The treatment systems were operated with recirculation rale of 200% offish tank volume per day Excessive nutrients of discharged water fi-om fish tank were purified in the wetlands and re-circulated back to the original tank Nitrogen and phosphorus concentration were in a suitable range for normal catfish grmi th during the culture period of months without any water-exchanged Remarkably, T orientalis helped to further remove about 17%N and 34%Pfi-omwastewater via vegetative uptake In addition, algae growth and clogging were observed solely in the unplanted wetlands The results indicated that T orientalis played an important role in nutrient removal and in improving wetlands condition by time TOM TAT Muc dich cua nghien ciru ndy Id ddnh gid hieu qud xir ly cua he thdng ddt ngdp nudc kien tgo chdy ngdm ngang cd trdng cdy vd klidng trdng cdy Wong viic ldm sgch nudc thdi nudi cd Tra thdm canh Khd ndng tdi sinh, sinh khdi i d hdp thu dinli dirong ciia Bdn bdn (Typha orientalis L.) dugc ddnh gid nghien ciru ndy Cdc he thdng xir ly dugc vdn hdnh vdi tdc ludn hodn la 200% the tich nudc be cd mdi ngdy Binh dudng thira nudc he nuoi cd se duoc ldm sgch tgi hi thdng ddt ngdp nuac kiin tao vd sau dugc bam trd lgi bi cd Ndng dgm vd ldn nudc be cd vdn ddm bdo su phdt trien binh throng cho cd Tra sudt thdng nudi khdng thay nudc Dgc biet, Bdn bdn da gop phan logi bd 17%N vd 33,8%P tu nudc thai thdng qua qud trinh hdp thu vdo sinh khdi thuc vdt Ngodi hien tuang ldo phdt triin vd chdt nen bi chi ghi nhdn trin hi thdng klidng trdng cdy Kit qud cho thdy Bdn bdn ddng vai trd quan trong viic logi bd chdt dinh dudng vd cdi thien diiu hin hi thdng xir ly theo thdi gian Gl6fITHl£U Trong nhiing ndm gdn da> Dong bang sdng Ciiu Long (DBSCL) la mpt nhiing vimg nuoi thiiy sin ldn nhit d Viet Nam vd ca Tra dugc xem Ii loai dugc nudi chii luc Md hinh nudi ci Tra thim czmh tgi day da tang nhanh chdng ca vi dien Tap chi Khoa hgc Truang Dgi hgc Cdn Tha Plidn A • Kboa hgc Tu nhien Cong nghi vd Mdi iruang: 29 (2013/ 31-36 tich va mat dp nudi Tuy nhien, thyc tl dd cho thiy nuoi ca theo huifa tfaiic thim canfa da cd tie ddng rat ldn din mdi trudng thiic an du thira chdt thai dgng phdn vd chdt bii tilt bi ticfa tu Iai nudc vi nin day Lugng nudc tir cdc ao nudi dugc thay thudng xuyen vd ting dan theo thdi gian thu hoach va the tich nudc thay frong ao khodng tir 30-100% Trong thyc ti, lugng chat thai ndy hdu hit dugc bom tryc tiep sdng hay kinh rach cic hp nudi chua cd phuang dn xu ly Tren tfal gidi, di cd mdt sd nghiin eiiu vl xir Iy cfadt thai tir ao nudi ed fra ddng thdi tan dung dinh dudng vdi nfaieu muc dicfa HI tfadng xii Iy bdng dit nggp nudc (DNN) ket h ^ vdi nudi tring ihiiy sin tuan hodn da dugc nghien eiiu d DBSCL vdi kit qua thi xii ly nudc thii (Trang, 2009; Konnerup et al, 2011) Mdt frong nhCing phin gdp phan ldm ling hieu qua xir ly cho he thdng DNN la thyc vdt frdng frong h | thong Thyc vgt he thong DNN ddng vai fro rdt Idn, chiing CO kha ning giai phdng oxy vi van chuyin oxy vao viing re ciy thiic day phdn hiiy hiiu va nifrate hda Bin cgnh dd re ciia chiing cdn lam gii bim cho cic vi sinh vit tao ming sinh hpc 6k ting cudng cho cac qui frinh chuyin hda nita hip tfau cac cfait dinh dudng (Brix, 2003) Do dd, vile lya chpn thyc vit phii hgp la tiiu chi quan trpng nhim lam tdng cong cho qui trinh xu ly cOa cdc he ' thing DNN Theo nghien ciiu ciia Trang (2002) khing djnh rdng ciy Bon bdn {Typha sp.) dugc xem li thuc vat cd tiem ning frong xii ly nudc thai chin nuoi va la lodi cd tuoi dugc gia siic thich an nhit loai cay dugc nghien ciiu Do dd, cay Bon bdn dugc sii dung frong nghien cuu hiln tgi di danh gii kha nang xii ly dam, ldn frong nudc thai bl nudi ca Tra thdm canh ciia he thing DNN ngdm ngang Khi ning tij sinh, sinfa khdi va hdp thu dmh dudng ciia Bon bin (Typha orientalis L.) dugc khio sit nhim dinh gii vai frd ciia Bdn bin frong he thing xir ly PHU'ONG PHAP NGHIEN ClTU 2.1 Bd tri tfai nghiem Bdn he thong dit nggp nudc (DNN) chdy ngim theo phuong ngang da dugc thiit ki vd v§n hdnh frln thing tir cac tfai ngfai|m trudc (Le Minh Long 2011; Nguyin Tfai Tfado Nguyin, 2011) Tuv nhiin cd mdt sd chinh sixa he thdng di gidm bdt nhiing hgn chi_ gap phai frong tfai ngfailm cu nhu:fadeddu vio bi ngam ngang dugc dd dd (01020mm) chieu cao ngang vdi mdt chit nin (20cm) (fagn cfaefaientugng tdo no hoa dfapcdiu vao), va bd fri lai mdi he thdng xii ly nude thdi gdm mdt bi cd dieu phdi vdo faai be DNN eiing loai hinh (Hinh I) cd frdng cay va nghiim thiic khong fring ciy dupe xem Ii ddi chiing {6h xdc dinfa ro vai fro cua thyc vgt qui trinh xii Iy) Mdi hi thing xii ly dugc bo tri ldn lip Iai di xir ly nudc tfaai be nudi ca Tra tfadm canfa tudn hoin kin 2.2 Thiet ke h$ tbong xir ly Mdi he thing xu Iy bao gdm: (I) Be cd Tra (thi tich nudc nudi Im'): mgt dd nuoi la 110 con/m-\ frpng lugng cd ban ddu trung binh 1.6kg (cfao cd dn 3% frpng lugng ci ban ddu bdng thuc an vien nil 25% N (2 Idn/ngiy) sau dd cho dn dya theo nhu ciu dn ciia cd); (2) hai bl DNN (tuong iing ldn lip lgi); va (3) be thu gom cd gin mdy bom chim va phao ndi dl bom nudc tudn hodn Igi bi ca (Hinh 1) HI thdng DNN kiin tgo thilt ki vdi ddng chay ngam Uieo phuong ngang (200cm ddi x 70 cm ngang x 30 cm cao) ddu vio moi bi se dugc ngdn 1fapcdai khodng 30cm vd dugc di (01020 mm) cao bing vdi mat chat nin, ldp chit nin day 20 cm (khodng 190L) Id vo so (02-5mm), myc nudc ludn giii thip hon mat chdt nin 5cm Ciy Bdn bon frong he thdng: da dugc tfau faogch phin than (chira lai 30 cm) kit thiic thi ngfailm trudc Trong nghiin ciiu nay, khd ning tii sinh, toe dp ting trudng va hdp thu dinh dudng ciia Bdn bin dugc theo ddi Hinh 1: S a d i bo tri he thing chdy ngam ngang c6 cay (A), ngim ngang kfaong tring c3y (B) Ghi chu- X Id vi tri ihu mdu Tap chi Khoa hgc Tnr&ng Dgi hgc Cdn Tha Phdn Khoa hgc Tu nbien Cong nghe vd Mdi tnr&ng: 2912013)- 31-36 2.3 Vdn faanh b | thing mau tgi thdng ddu tien li mdi tuan/ldn, thing sau vdi tin suit tuin/ldn Ndng dp TKN (tdng dam Kjeldahl, NO:-N (dam nitrite) NO3-N (dam nifrate) vi TP (tdng lin) nudc dugc pfadn ticfa theo quy trinh tiiu cfauin danfa gii nudc vd nudc thai (APHA era/., 1998) Thyc vit: Trudc bat ddu thi nghiim, thyc vdt frln hi thong dugc cat bd phan than phia trin chat nin, nhung di chilu cao cdn lai khodng 30 cm tinh tir bl mit chat nen Vao thang thii sau bit diu nghiin ciiu, tien hanh thu hoach thyc vit frln he thdng cay bat diu ngimg tdng trudng vi cd bilu failn ldo hda (ciy hoa, la gid) O tfadi 2.4 Tfau va phin ticfa mau diem nay, cay cung dugc thu hoach tdt cd phan Cfadt lugng nudc: Mau nudc dugc thu than va dl Igi chilu cao khoang 30 cm Sau dd tilp be ca vd ddu cda cdc he thing DNN Trong bl cd tyc theo ddi ldng trudng ciia cay din kit thiic mdu nudc dugc thu d nfaiiu vi tri va nhilu ldng thi nghiim (ngay thir 105) Sinh khdi vd hdm lugng khac nhau, sau ir^n diu vd ldy miu dgi diln dam, Idn frong ciy dugc thu vd pfadn tich vao thdi Riing mdu nudc lai diu cua cac he tfadng DNN diim bat ddu va kit thiic thi nghiem Phuong phip dupe thu fryc tiip qua ong diu Tdn sudt thu pfain lich mau thyc vit dupe tfal hiln d Bing thirc vat Bing 1: Cac cbi tieu va phmmg pfaip pban tich mlu Nudc thdi tir mpt bl cd dugc bom tdi hai bi DNN ciing ciia mdt loai fae thdng, nudc diu ciia cdc bl dugc tip trung lgi d mpl bl thu gom vi bom frd lai bl ci mpt each ty dong nfad mdy bom thd chim kit ndi vdi phao diln (Hinfa 1) Cdc fae thdng hoat ddng nhd bp h?n gid vd dugc cii ddt 13 phiit bom, 26 phiit ngfai vdi tdc dp bom la 3.840 mL/phiit Toe dp nudc dugc dilu cfainfa bdng cac van dl dam bdo dgt 200% luu lugng nudc frong bi ci dugc xii ly vd ludn hoan frong ngdy dim (Trang, 2009) Chi tiiu Don vj Sinh khdi tuoi g Sinh khdi kfad g N tdng sd %N P tdng sd %P 2.5 Phin tich va xiJ 1^ s6 li^u Pfauong pfaap Cin Siy d nhilt dp lOS^C din trpng lugng khdng doi Chung cit Kjeldafal Phuang phap acid ascorbic, so mau KET QUA VA THAO LU4.N Tit ca sd lilu vl chit lugng nudc, hdm lugng 3.1 Chat lirgng nirdc be ea dam, lin frong thyc vdt dugc thu thgp, phin tich Trudc van hanh he thdng, cdc thong so vl thdng kl, so sanh kit qua trung binh giiia nghi|m chat lugng nudc ban ddu cua cdc bl ca (dugc xem thiic dya vdo phdn mem Excel vi phin mim thdng li ddu vao cua cac he thdng xir ly tuong iing) duge ke Statgraphics Centurion XV (SlalPoint, Inc., thu va phin tich nhim danfa gid chat lugng nudc USA) ban diu (Ddu vu) Bdng 2: N6ng dp ciia TN, TP nudc bat dau va ket thuc tfai nghiim ciia hai he thong DNN co cay vd kfadng cay TFl :mga,) TN (mg/L) Tile Tile fia u vu Cuoi vu' Cuoi vy* {)au vu 7,0 1:0.7 0,6 9,2 1:15,1 10,0 HT BNN CO cay 11,4 9,9 1:0,9 1,0 11,4 1:11,5 HT DNN khong cSy Ao t h i r l " S.9 12.2 1:2,1 1.2 0,5 1:0,4 4,5 9,2 1:2,0 0.8 0,9 1:1.1 Aothu-2" 6,4 9,9 1:1,6 1,0 0,7 1:0.7 Aothir3" Ghi chu - HT: he ihdng '• Cuoi Vfl vdo cuoi tt g ihu " \ghien cuu cua Cao Vdn Thich (2008) Nong dp tdng dgm (TN) bao gdm tdng ndng TKN, NO2-N vd NO5-N dugc trinh biy frong Bing Kit qua cho thdy sau thd ca dugc thi ndng dp TN TP ciia cac be cd nghiin ciiu da cd ddu hieu d nhilm Sau dd, h | thong xir ly bdt diu dupe van hinh vi sau gin thing nghien ciiu cho thay ndng dp TN cd xu hudng gidm so vdi ban dau mac dii nudc be ca hoan toin khong thay mdi Trong d nghiin cuu cda Cao Van Thich (2008) cho thiy ndng dp TN diu lang vi cudi vu d ca ao, tdng tir 1,6-2 lan Sy gia lang lien quan din sy U'ch liiy cic vgt chat dinfa dudng Tgp chi Khoa hgc Tnr&ng Dai hgc Can Tho Phdn A' Khoa bgc Tunhien Cong nghi vd Moi Inrang: 29 (2013)- 3l-3i frong ao nudi, mdc dii ngoii tfayc lien nudc ao dupe thay thudng xuyln die biet vdo cudi vy Doi vdi ning dp ting ldn (TP) thi frong nghien ciiu hiln tgi cho thiy c6 sy tich lOy sau thing nghien ciiu, frong dd frong nghien ciiu ciia Cao Van Thich (2008) hiu nhu lupng TP khong co sy tich luy frong ao Nhu da phdn tich phan frln, nudc vi bim diy frong ao nudi thuy sdn ngoii thyc tl dugc thay thudng xuyen, qua dd lam giam ndng TP dang ki Nfaimg frong he tfadng ciia nghiin ciiu hien tgi, nudcfaodntoin kfadng dugc thay mdi nen cd sy tich luy TP frong nudc be ci thirc an thira, phan cd va xic bi thyc vat, tio Thong thudng ldn frong ao nudi khong li ylu td gdy ddc cho ca nhung ndng dp lan cao gdy hiln lugng lao no hoa frong nudc nlu khdng dupe xii ly vd xd thai kinh rgch (Konnerup el ai, 2011) Tuy nfailn, day Idfaetfadng tuin hoin nudc (kfadng xi tfadi ngodi moi trudng), dd hgn che dugc phdn nao hiln tupng phil dudng hoa d nguon nudc mdt thing cd cay vd khdng cay ldn lugt Id 100% va 97.2% Ngodi ra, he sd chuyin hda thiic an cua ca hai he thdng Id khodng 1,3 Dilu cho tfaiy vi^ kit hgp he tfadng DNN ngam ngang md fainh nudi ci Tra tham canh tudn faoan kin da mang lgi kit qui kha tfai frong vile gidm ndng dd dam, ting hi|u qua su dyng nudc, hgn chl xa thai nfaung vdn dam bao chit lugng nudc cfao cd phat triln tdt 3.2 Sucan bdng dinh dudng cac h^ thong Trong sudt thdi gian thi nghiem, ngudn dpi (N) lan (P) dugc cung cap dau vao cho cdc h? thing chii yiu qua ngudn thiic an ciia cd,frongthjt ci va nudc bl nudi ban dau (diu vio), bo qua thdnh phan dgm vd Idn frong nudc may thim vao qua frinh bdc thodt hai nudc (vi ndng dp TN TP nudc may rit it) Dya theo kit qua phan tich ndng dp N vd P frong thiic dn (Trang, 2009) va frong thit cd (Cao Van Thich, 2008) di tinh sy cin bdng dinh dudng dgm, ldn frong cac he thing (Bang 3) Qua thing nghiin ciiu cd frong ci hai he thong diu phit trien binh thudng vdi ti 11 sdng d he Bang 3: Su cdn bang lirgng dam va lan cac h i thong Thitc an' Ca" Nuoc Dau vao Tonf; ddu vao Ca" , , Nuoc Dau Tons ddu Lugng mat di % mat di Ghi chu Dam (B/be) HT khdng cSy HT CO cay 410,1 410,1 36,7 36,7 11,4 10,0 456.8 458,2 192,9 189,4 7,0 9.9 199.9 199,3 256,9 258,9 56,2 56,5 HT c6 caj 105,8 23,5 0,6 129.9 55,3 9,2 64.5 65,4 50,3 Lan (g/be) HT Ithong cav 105,8 23,5 1,0 130.3 54,3 11,4 65,7 64,6 49,6 - HT h? ihdng Kit qua cho thdy lupng dam mat di ciia hai loai he thdng gdn nhu gidng (Bing 3) Tuy nhiin bin chit logi bd N thi khac nhau, frong he thing khdng cay thi lugng dam mit di chu yeu dugc giu lgi frong chat nen d he thong cd cay mdt phin lugng dam mit di se dugc thyc vdt hip thu, va phan ldn se dugc giir Igi frong he thing bdi chdt nin va rl cay Thyc tl quan sat chit nin he thdng khdng cay theo thdi gian di bj cfait ran frong nudc thai vd xic tdo lich luy cdng nfaiiu Khong gidng nhu dam, lan kfaong co thinh phdn nin chu frinh lan dugc xem la chu trinh kin (Le Anh Tuin et al 2009) Theo Kadlec & Knight (1996) cho ring, qud frinh chinh loai bo lan DNN Ii cac qua trinh kit tiia, hap phy, hap thu cua thuc vdt vi vi sinh vat Nhu da giii thich d phdn frln thi d he thdng cd cdy, thyc vit gop phin vao vile logi bd ldn qua qua trinhfadpthu tao sinh khoi (hap thu 33,8% lugng lin mdt di), cdn dii vdi cdc h? thing khdng cay thi lin chii yiu dugc giii lgi chat nen 3.3 Vai trd ciia thijre vat he thing Thyc vat ddng vai fro quan frpng frong he thing DNN, nd sii dung chit dinh dudng DNN di tgo sinh khdi vi lam gid bim cho cdc vi sinh vgt phan hiiy chdt huu co (Kadlec & Knight, 1996; Brix 2003) Thyc vgt he thing hi|n tgi dugc sii dung tir ngudn cdy tdi sinh tir nghiin ciru frudc (Ll Minh Long 2011; Nguyen Thj Thio Top cbi Khoa hgc Tru&ng Dgi hgc Cdn Tho Phdn A: Khoa hgc Tu nbien Cong nghe vd Mdi truang- 29 12013): 31-36 Nguyen, 2011) Trudc kfai tiin fadnh tfai nghiem thyc vgt dugc cat bd phdn thdn frln, chi di Iai khodng 30 cm phin thin tinh tii be mil chdt nin Sau gdn tfaang thi nghipm, ciy Bdn bdn dugc thu hoach phan tfadn (cfaiia khoing 30 cm phdn tfadn tinfa tir mdt chat nen) nhim lira tdng kfai nang xii ly cua he thong Bdi vi neu ciy frdng khdng dugc thu hoach thi phdn Idn cdc chat dinfa dudng da dugc dua vdo md thyc vat sl fri lai vao he thing thdng qua qud frinh phan buy (Brix, 2003) Trong nghiin ciiu sinh khdi ciia cdy Bon bon dugc tinh Id phan than (tinh tir be mat chat nin) Cay Bdn bdn ed tdc dp tang trudng sinfa khdi cao nhit frong hai thdng dau thi nghiem Tuy nhien, nguon cay Bdn bdn cua he thdng dugc sir dung tir nguon cdy tdi sinh cua thi ngfaifm trudc nen tdc dp tang trudng sinfa khdi tuai di giam nhieu frln ciing he thing (238,6 g/m-.ngay theo Le Minh Long, 2011) Bang 4: Toe dp tdng tnrdng sinfa kfaii tirui (g/m^.ngay) cua cay Bon bon tren he thdng ngdm ngang theo thcri gian Toe tSng triT&ng 0 Thoi gian (ngay) 53 79 173,8'±17,0 7,5'±6,2 105 64, I ' i 9,5 Trung binh 81,8±31,3 Ghi chu- So lieu duac trinh bdy trung binh - sai so chudn, n^2 Nhirng gid tn Irong cung mgt hdng cd ky lir °- ''gidng thi khong khdc biel ve mat thong ke (p>0,05: dua vdo hem dinh Tukey) Bdn bdn frong he thdng cd nang hap thu chdt dinfa dudng frong nudc thdi nudi cd dl tgo sinfa khdi, kit qud cho thdy Bdn bdn dd gdp phdn frong viec logi bd 17%N vd 33,8%P, Kha nang loai bd dgm cua Bdn bdn he thdng tuong duong vdi nghiin ciru cua Van de Steen et al (1998), ghi nhin beo cam giiip logi bd 18%N frong tdng lugng dam diu vdo Trong nghiin ciiu xii Iy nudc thii bl nudi ci Rd phi thim canh tuin hoin bang hi thong DNN frdng xa Idch, rau mudng vd cay hue nudc, Trang & Brix (2012) da ghi nfadn dugc ba loii ciy frdng chi giup logi bd 6%N vi 7%P tong lupng ddu vio se dugc loai bd hoin toan khdi he thdng thdng qua qui frinh thu hoach tfayc vdt Trong d hi thdng khdng frdng cay, phan ldn him lugng chit dinh dudng dugc giii lgi frong chat nen vd lugng lio frln bl mil chdt nen Ngoii qua quan sil thyc tl cfao tfady Idp chat nin cd bilu hiln bj nghin dong chiy theo thai gian cin bafairuca va xdc tdo pfadn huy Trong bp re Bdn bon d he thdng ed frdng cay giiip tgo lo hdng frong chdt nin, nin khdng cd hiln tugng chdy frdn be mat Do dd, d h | thdng ngdm ngang khong trdng ciy nlu vin hinfa lau dai se din den hiln tugng chdt dinh dudng fri lgi cho he tfadng, kfadng dugc logi bd hoan toan Bang 5: Him lirgng dgm va lan trung binh cdy Bon bon Dam(gN/m^) Lan (gP/m^) Ban dau 5.8 ± 0,5 3,0 ± 0,2 Kit tfaiic 24,1 ± 0.4 12.3 ± 0.2 Lugng tang them 18.3 J: 0.8 9,3 ± 0.4 KET LUAN VA DE XUAT 4.1 Kit ludn Nong dam frong be ci khong tich luy theo thdi gian cd hai he thdng, nhiin cd sy lich liiy ldn d cuoi thi nghiem Bdn bin giiip logi bo 17%N vi 33,8%P frong tdng lugng dau vdo va kha ndng hip thu N vi P cua Bdn bdn d he thdng trdng cay la khodng 0.17 gN/m-.ngiy vi 0.09 gP/m-.ngiy Kfad ndng hdp thu N vi P ciia Bdn bon d h | tfadng frdng cay Id 0,17 gN/m-.ngdy va 0.09 gP/m^.ngdy Kit qua ndy thip hon ve ndng hdp thu dgm (0,38 gN/m-.ngay) nhung tuong duong vi ndng hdp tfau lin (0,098 gP/m-.ngiy) frong ghi nfain cua Konnerup et al (2011) sii dyng cay Hue nude frong frong he thdng DNN ngira ngang xir Iy nudc thai ao nudi cd Ro phi ban thara canh tudn hoan kin Qua dd cho thiy, mac dii lugng dgm, Ian raat di cua ci hai he thing tuong duang nhung d he thing ngim ngang cd trdng cdy thi cdc him lugng dinh dudng ndy da dugc tich liiy frong Bon bdn va - Trong sudt qua frinh nudi kfaong can thay nuoc mdi nhtmg chdt lugng nudc vdn nam frong gidi han cho phep de nudi ca Tra dac biet cd sy kit hgp he thdng dit ngap nudc ngim ngang cd frdng Bdn bdn 4.2 Di xuat - Cd the img dyng he thdng ddt nggp nudc ngdm ngang dl xu 1> dam frong nudc ao nudi cd Tra dac bill kit hgp viec trdng Bdn bdn frong he Tap cbi Kboa hgc Tnrang Dgi bgc Can Tlio Phdn A: Khoa hoc Tu nbien C^g ngbe vd Mdi tru&ng- 29 (2013): 31-36 thdng Tuy nhien, cdn nghien ciiu d quy md ngoai thyc tl dl cd kit luan ro ring hon - Tii kit qui nghiin cim cho thay can thu hogch Bdn bin mdi thing di tdng hieu suat xii ly ciia he thong va la bien phip logi bd hdn dgm, lan khoi hi thdng Nghien ciiu them logi chit nin cd ning hip phy lin failu quafrongthdi gian ddi LCn CAM TA Dy an niy dugc ho frg kinh pfai tii dy an PfaysCAM, chinh phii Dan Mach tai frg Tac gii chin cam on Bd mdn Khoa fapc Mdi trudng da nhilt tinh hd trg phong thi nghiera, giiip chiing toi hodn tdt kit qui nghiin cuu niy TAI LIfU THAM KHAO American Public Health Association (APHA), American Water Works Association (AWWA), Water Confrol Federation (WCF) (1998) Standard raethods for the examination of water and wastewater, 20tfa ed Washington D.C., USA Brix H (2003), "Plants used in constructed wetlands and their function", 1st International seminar on The use of aquatic macrophytes for wastewater treatment in constructed wetlands May 8-10, 2003, Portugal J Cao Van Thi'ch (2008), Chdt lugng nudc vd tich luy vdl chdt dinh dudng ao nudi cd Tra (Pangasius hypophthalmus Sauvage, 18 78) thdm canh d qudn O Mdn, Thdnh Cdn Tha Luin van Thgc sT chuyen nginh Thuy sin Trudng Dai hpc Cin Tho - Kadlec, R.H., and R.L Knight (1996), Treannent Wetlands, CRC Press Boca Raton USA Konnerrup D N.T.D Trang, H Brix (2011) "Treatment of fishpond water by recirculating horizontal and vertical flow constructed wetlands in the fropics", Aquaculture (313), 57-64 Ll Anh Tudn, Le Hoang Viet, G Wyseure (2009), Bdt ngdp nudc kien tgo Nha xuit bdn Ndng nghiip, Thanh phd Ho Chi Minh: 84 trang Ll Minh Long (2011), Ddnh gid khd nang xu ly dam nudc bi nuoi cd Tra thdm canh bdng hi thdng DNN kien tao Luin van Thgc si Khoa hgc Mdi trudng Trudng Dai hpc Cdn Tlio Nguyen Thi Thao Nguyin (20ll),£>dnAgj'a khd ndngxd ly ldn nudc be nudi cd Tra thdm canh bdng hi thong DNN kiin tgo Luan vdn Tfaac sT Khoa hpc Mdi trudng Truong Dgi hpc Cin Tha Trang N.T.D., J.B Liang, Liao, X.D., Yaziz, M.I (2002), Growth and nutritive value of some tropical plant species grown in cattle wastewater In Proceeding of Malaysian Science and Technology Congress 12*-M*^ December 2002, Kuching, Sarawak, Malaysia, BR 15 10 Trang, N.T.D (2009), Plants as bioengineers: treatment of polluted waters in the tropics Doctoral Thesis, Aarhus University, Denmark 11 Trang, N.T.D., and Brix, H (2012), Use of planted biofilters in integrated recirculating aquaculture-hydroponics systems in the Mekong Delta, Vietnam Aquaculture Research In press 12 Van de Steen, P., Brenner, A Oron, G (] 998), An integrated duckweed and algae pond system for nitrogen removal and renovation Water Science and Technology 38, 335-343 ... fainh nudi ci Tra tham canh tudn faoan kin da mang lgi kit qui kha tfai frong vile gidm ndng dd dam, ting hi|u qua su dyng nudc, hgn chl xa thai nfaung vdn dam bao chit lugng nudc cfao cd phat triln... 84 trang Ll Minh Long (2011), Ddnh gid khd nang xu ly dam nudc bi nuoi cd Tra thdm canh bdng hi thdng DNN kien tao Luin van Thgc si Khoa hgc Mdi trudng Trudng Dai hpc Cdn Tlio Nguyen Thi Thao... wetlands May 8-10, 2003, Portugal J Cao Van Thi''ch (2008), Chdt lugng nudc vd tich luy vdl chdt dinh dudng ao nudi cd Tra (Pangasius hypophthalmus Sauvage, 18 78) thdm canh d qudn O Mdn, Thdnh Cdn Tha