Top chi Khoa hgc Trudng Dgi hgc Cdn Tho Phdn A Khoa hgc Tv nhiin, Cdng nghi vd Mdt Irudng 35 (2014) 46 53 Tap chf Khoa hoc Tru''''dng Dai hoc Can Thd website sj ctu edu vn BANH GIA HI£U QUA XU" LY NlTdC[.]
Top chi Khoa hgc Trudng Dgi hgc Cdn Tho Phdn A: Khoa hgc Tv nhiin, Cdng nghi vd Mdt Irudng: 35 (20 Tap chf Khoa hoc Tru'dng Dai hoc Can Thd website: sj.ctu.edu.vn BANH GIA HI£U QUA XU" LY NlTdC THAI GIET MO GIA SUC T A P TRUNG CUA DiA QUAY SINH HOC VA LONG QUAY SINH HOC Le Hoang Viet', Nguyin Vo Chdu Ngan', Luu Trgng Tac^ va Le Thj Bich Vi" ' Khoa Moi truong & Tdi nguyen Thien nhien, Truong Dgi hgc Cdn Tho ^ Lop Ky thudt Moi trucmg K36, Trudng Dgi hgc Can Tha Thong tin chang: Ngdy nhdn: 03/09/2014 Ngdy chdp nhdn: 29/12/2014 Title: Evaluation ofslaughterhouse wastewater treatment efficiency of rotating biological contactor and package cage rotating biological contactor Tir khoa: DTa quay sinh hgc, long quay sinh hgc, nude thai giit mo gia sue Keywords: Rotating biological contactor, package cage biological contactor, slaughter-house wastewater ABSTRACT The study on "Evaluation of the slaughter-house wastewater treatment efficiency of rotating biological contactor and package cage rotating biological contactor" was done to evaluate the slaughter wastewater treatment efficiency of rotating biological contactor having PVC flexibleconduit medium, and packed cage rotating biological contactor with woolthread medium The testing results showed the treatment efficient of package cage rotating biological contactor was better than that of rotating biological contactor al the hydraulic retention time of hours and all of testing parameters of the effluent reach QCVN 40:2011/BTNMT (column B) The two-stage biological treatment of slaughter wastewater with package cage rotating biological contactor as the first stage and rotating biological contactor as the second stage gave the effluent having testing parameters to meet QCVN 40:2011/BTNMT (column A) Nghiin cuu "Ddnh gid hieu qud xir ly nuoc thdi giet mo gia sdc tgp trung ciia dta quay sinh hgc vd long quay sinh hgc" dugc thifc hien nhdm so sdnh hieu qud xu ly cua dia quay sinh hgc co gid the dng nhua dgng khoi dia vd long quay sinh hgc co gid thi bong tam Kit qud thi nghiim cho thdy hieu qud xir ly cua long quay sinh hgc cao han dia quay sinh hgc a thdi gian luu gia vd tdi cd cdc chi tiiu theo doi nude thdi sau XU ly dgt QCVN 40:2011/BTNMT cgt B Khi xir ly sinh hgc nuac thdi giit md hai giai dogn vdi giai dogn J la long quay sinh hgc vd giai dogn II la dTa quay sinh hgc cho nude thdi sau xir ly co nong dg cdc chi tieu theo doi dat QCVN 40:2011/BTNMT cgt A GIOfITHI|:U Cling vdi sfl phdt triln kinh ti xi hdi thi nhu ciu thyc phim cdng tdng cao, d§c bift Id sy gia ting nhu ciu cdc sin pham cd ngudn g^c td chin nudi nhu tbjt, trung, sfla tfl dd dan den hinh cac Id gilt mo gia sdc tap trung phuc vy nhu ciu tieu dflng hing cda ngudi Tuy nbiln, nude thdi phit sinh td phin ldn eic Id gilt md dugc thii sdng, hd, kenh, rgch mi chua qua xfl ly hogc xfl ly chua dgt tilu chuin gdy d nhilm nghiim ttgng mdi trudng xung quanh, logi nude thdi cd ndi^ dd SS, BOD, COD, N, P cao vd nhilu vi triing gdy benh Mot si nghien eflu xu ly loai nude thdi da dugc thyc hifn nhu nghiin eflu cfla Ngd Thi Phuong Nam et al (2008) xfl ly nude thai id gilt mo gia sdc bing qui trinh sinh hgc thi hdm cho nude thai ddu dat QCVN cgt B Ll Cdng Nhit Phuang et al (2012) nghiin cdu xu Tgp chi Khoa hgc Trudng Dgi hgc Cdn Tha Phdn A: Khoa hgc Tu nhiin, Cdng nghe vd Mdi tmcmg: 35 (2014): 46-53 ly ammonium frong nude thii giet md bang viec kit hgp qua trinh ni-trit hda mdt phin/anammox eho hifu suit xfl ly 92% d tii ttgng 0,04 kgNNH4/m\i^iy va 87,8% d tai ttgng 0,14 kgNNH4/m^.ngiy DTa quay sinh hgc la loai hinh xfl ly smh hpc bilu theo kieu tang trudng bim dinh dugc nghien eflu v i phit trien tgi Dflc vao nhung nim 1960, den hf thdng dia quay sinh hpc dugc ung dyng rdng rai tgi nhieu qudc gia frIn the gidi (Metcalf & Eddy, 2003) DTa quay smh hgc li cdc khdi dia frdn lam bing nhua PE hay PVC gin ttln mdt tryc, dia dugc dat ngip mot phan vao frong nude thdi Khi vin hanh dTa se duge eho quay cham xung quanh frue, sinh khdi se bam frIn bi mat dia tao ldp mang sinh hpc Khi khdi dTa quay xudng, vi sinh vit (VSV) nhdn chit nin (chit dinh dudng) ed frong nude thii; khdi dTa quay Ien, cic VSV liy d-xy dl d-xy hda cie chit huu co vi gidi phdng CO2 DTa quay smh hpc thudng dung de loai bd BOD frong nude thai hay diing dl chuyin hda a-mdn ni-friL Cdc loai nude thai thich hgp eho he thdng Id nude thii sinh hogt, nude thii benh vifn, vd nude thii mpt sd nginh cdng nghifp Uu dilm cfla dia quay sinh hpc Id thdi gian ton luu ngin, chi phi vin hanh va bao fri thip, hf thdng eho loai bun chua it nude, cd nang ling nhanh (Grady et 2004) Dk xfl ly nude tiiii cd nong dp chit hflu ca cao ngudi ta thudng sd dyng nhilu dia quay sinh hpc ndi tilp vdi nhau, mdi dia quay sinh hgc dugc coi li mot giai doan xu I^ Tuy nbiln, vifc ung dung d!a quay sinh hgc d cac nude dang phit triln bi hgn ehl chi phi nhgp cic khdi dTa niy kha cao Dl hg gia thinh vd don giin hda vifc chl tao dTa quay sinh hgc, ngudi ta da chl tao cdc Idng quay sinh hgc, diy la cdc long ludi ben chfla cdc gid thi de VSV bdm vio tgo ming sinh hpc (Suianuntapiboon, 2006) Nghiin cuu "Danh ^ a bifu qui xfl ly nude &ii gilt md gia sue tap trung bing dTa quay sinh hpc va Idng quay sinh hpc" dugc thuc hifn vdi muc tilu tdng quit la ddnh gia kha ning sfl dyng cdc vgt dyng phd biln tten thi trudng lam gid the chl tgo dia quay sinfa hpc (DQSH) vd long quay sinh hpc (LQSH); flng dyng DQSH vd LQSH di xfl i^ nude thai gilt md gia sfle Cdc cdng viec cu till cfla nghiin eiiu nhu sau: - Danh gid hifu qua xfl Iy nude thai gilt mh cfla DQSH cd gid the la dng nhua va LQSH cd gii the la bdng tam; tim thdng sd thiet ke v i vdn hdnh cua chdng dl cd thi dp dyng tiiyc te ddi vdi cic'loai nude thii tuong ty Danh gii hifu qui xfl ly sinh bge hai giai dogn cfla nude thii gilt md vdi giai dogn I Id LQSH va giai dogn II la DQSH PmrONG PHAP VA PHlTONG T I £ N 2.1 Thdi gian, dia diem thyc hifn dl tii Nghien eflu dugc tiin hanh tgi Phdng thi nghiim Xfl ly nude thii vi Phdng thi nghifm Sinh Ky tiiudt Mdi trudng cfla Bd mdn Ky thuit Mdi ttudng, Klioa Mdi trudng & Tai nguyin Thien nhien - Trudng Dai hgc Cin Tha Thdi gian tiiyc hifn tfl thdng 8/2013 din 1/2014 2.2 Bdi tugng thi nghifm 2.2.1 Gid thi Ddi vdi phuong phdp sinh ttudr^ bim dinh viec lya chgn gid thi rit quan ttgng, anh hudng ldn din hieu suit cung nhu chi phi diu tu Dl dim bio dat hifu suit xfl ly va chi phi dau tir thip cd thi sfl dung cdc vat dyng, dd dung sinh hoat gia dinh co cdc dac dilm nhu phd biln ttln tin trudng, re tien, df rdng cao, difn tich hi mat ldn, Dua tten ci^tilu^ chl dd, dng nhya ludn diy dien vi bdng tim duac chgn ldm gii thi dl thyc hifn nghiin cdu ndy a) Ong nhya (6ng day ludn dien) b) Luoi (bong tim) Hinh 1: Cic logi gii thi dugc sfr dung dl chi tgo DQSH va LQSH Tgp chi Khoa hgc Trudng Dgi hgc Cdn Tho Phdn A: Khga hgc Tu nhiin, Cdng nghi vd Moi Irudng: 35 (2014): 46-53 2.2.2 Nude thdi 2.2.S Cdc thong so cita mo hinh Nude thii gilt md gia sfle cua Xi nghifp chl bien thyc phim I (phudng An Binh - quin Ninh Kilu - tiianh phd Cin Tha) dugc thu tai hd thu gom nude tip trung cua xi nghifp, sau luge so bf bdng vai dl logi bd phin ldn long, da, phan v i ling 60 phut dk gidm ndng SS rdi phin tich cae tinh chit ly hda nude thai nhu pH, SS, COD, BOD5, TKN, TP, NH4'^, NO3" nhim ddnh gid mfle dg phu hgp cho qud ttinh xfl ly sinh hpc va ed bien p h ^ hifu chrnh ein thilt Mdu nude thai dugc thu Igp lgi ldn ttong ngiy liln tiip dk cd tinh dgi difn Thi tich thilt ki cfla bi ehua DQSH va LQSH la 52,5 L vdi cic thdng sd nhu sau: Chilu rpng bl: R - 400 mm Chiiu dai bl: Dbe = 750 mm Tdng chiiu eao cda bl: H = 270 mm Chiiu sau cdng tdc: hcaiigtac= 200 mm Chieu cao mat thoing: 70 mm Thi tich nude bi: V = 48 L, frong dd thi tich phin dTa quay chilm ch5 ia L (do tryc tiip) ttyc quay Hinh 2: Kich thudc cua DQSH Tgp chi Khoa hgc Trudng Dgi hgc Can Tha Phdn A: Khoa hgc Tv nhien, Cdng nghe vd Mdi iruang 35 (2014): 46-531* ^^ /~^ v6 Idng quay ttyc quay > „ _ r ^ ^ JHinh 3: Kich thudc cua LQSH Bang 1: Cic thdng si thilt ke va van hanh cua SQSH va LQSH STT Thdng so OQSH LQSH Dudng kinb cua dia quay D^a (mm) 350 350 Tdng chieu dii true Ltruc (mm) 750 750 Ti If DflFj/Lnvc 0,47 0,47 Chiiu dii true phin b6 hsa (mm) 680 680 Khoing cdch giua cdc dia (mm) 16 Chiiu diy dia di (mm) 100 So gid thi khOi dia 67 bong tam Tdng diln tich bl mgt (m^) 36,6 40,78 Dp sdu ngip nude (%) 40 40 10 Lugng nude ngp cho mdi md hinh (L) 200 200 11 Thai gian luu nude (gid) 6 2.2.4 Tiin hdnh thin b Bo tri thi nghiim a Giai dogn tgo mdng sinh hgc tren gid thi - Thi nghifm 1: van hinh song song md CHa DQSH vd LQSH hinh di dinh gid bleu qui xu l^ cda DQSH vi DQSH vi LQSH vin hdnh vdi nude thdi giit mo, ddng thdi bfln hogt tinh td bl bfln hoatti'nhcua Cdng ty TNHH Hdi sdn Viet Hdi (xi Long Thanh, huyfn Phung Hifp, tinh Hiu Giang) dugc dua vio lim nguon VSV tao mdng sinh hpc cho cdc gii thi Vgn hinh DQSH vi LQSH hen tyc cho din tiiiy ldp bdn nhdt xuat hiln ttln gid till thi tiln hdnh cae thi nghifm chinh thuc LQSH d thdi gian luu gid Tu kit qua cua thi nghifm I, chgn md hinh cd hifu qui xu \^ cao ban d i tiln hanh thi n^iem Thi nghifm 2: van hinh md hinh dugc lya chgn d thi nghifm I vdi thdi gian luu tdng h o ^ giim so vdi thdi gian luu d thi nghifm nhdm tim thdi gian luu toi thiiu dl nude thdi sau xfl ly vin edn dgt QCVN 40:2011 (eft B) Tgp chi Khoa hgc Trudng Dai hgc Can Tha Pltdn A: Khoa hgc Tg nhiin, Cong nghi vd Mdi trudng: 35 (2014): 46-53 Tbi nghilra 3: bd tri LQSH vi DQSH hogt dfng ndi tilp tao thdnh hf thdng xd ly 02 gim dogn dl ddnh gia hifu qui xu ly luu giai dogn nude thii gilt mo O cic thi nghiem tten mdu nude thai dau vio vi ddu eua hf thdng dugc thu liln tilp dk phan tfch eic chi tilu ein ddnh gid la SS, BOD5, COD, TKN, NH4^, NO3', TP Cic chi tieu ndy duge phan tich tiieo chi ddn eua APHA, AWWA & WEF (2005) b i i ^ cae thilt bi phdng thi nghifm thugc Bp radn Ky thuit Mdi trudng - Khoa Mdi trudng vd Tai nguyen Thiin nliien - Trudng Dai hpc cin Tho K I T QUA VA THAO LU.^N 3.1 9ac trung nude thai tir Id giet md eua Xi nghiip che bien thyc pham I Nude thdi dugc liy tfl Id giet md gia sue tip trung cfla Xi nghiip chl biin thyc pham I, dem ve xfl {•^ so bd vi phin tich di danh gid khd nang xfl {•^ sinh hpc Bang 2: None dp chat nhiem nirdc thai Id giet mo (*) Nhu vgy, nude thii tfl Id gilt md chi ein xu ly sa bp li cd the dua vdo xfl ly bdng DQSH khdng can dilu ehinh gi thim 3.2 Kit qua thi nghifm 3.2.1 Kit qua thi nghi&m 1: ddnh gid hiiu qud xi ly cua DQSH vd LQSH thai gian luu gio Tiln hanh lay raSu dau vdo vd dau cfla hai md hinh lin lap lgi lien tye dem phan ti'ch Kit qud eho thdy ngogi trfl ndng dg BOD5 sau xfl ly eua DQSH, ndng dg chit d nhilm cua nude thii sau xfl ly bdng DQSH va LQSH diu dgt quy chuin xi tiiai QCVN 40:2011/BTNMT (cdt B) Ndng dd SS, BODs, COD, TKN, NH,* sau xfl ly bang LQSH thip ban sau xfl ly bang DQSH Rieng ndng dp TKN va NO3" khdng cd quy dinh ttong quy chuin xd tiiii QCVN 40:20U/BTNMT nln ndng df hai chi tilu dung dl danh gid sy chuyen hda dgm huu co ttong nude thai TKN vi NH4* cua nude thdi dau thip hon nhilu so vdi dau vio, ttong dd NO3' ting chung td dam hflu ca da dupe chuyen hda dgm a-mdn vi sau dd bi d-xy hda thinh dgm ni-trit, nhien lugng dgm ni-trit ting lln khdng tuang xdng vdi mflc gidm cua dam huu co va a-mdn, chung td ttong bl cdn cd qud ttinb klifl ni-ttit dien Thdng so flma vj Trung binb (n = 3) pH 7,2 ±0,15 SS mg/L 178 ± 6,56 COD mg/L 1854,3 ±195,1 Ndng COD, BOD5 sau xfl ly bing LQSH BODj mg/L 969 ± 67,5 diu dgt QCVN 40:2011/BTNMT (cpt B), cdn sau 97,9 ± 11 TKN mg/L xu Iy bing DQSH chi cd COD dgt quy chuin xa 18±2 TP mg/L tiidi QCVN 40:2011/ BTNMT (cpt B) Phan ti'ch 3,7 ± 0,32 NOs" mg/L ANOVA v i kilm dinh F cho ndng dp COD vi 37,9 ± 1,43 NH4^ mg/L BOD5 sau xfl ly cua hai md hinh diu khic bift cd y Ghi chu: (*) ndng ede chdt d nhiim sau lgc so b^nghia d mfle 5% vd de lang 60 phut So lifu ttong Bing cho thay: pH cda nude thiu Id gilt md li 7,2 ±0,15 nim ttong khoing 6,5 -^ 8,5 thich hgp cho xd 1^ sinh hgc bilu (Trinh Xuin Lai, 2009) - TJ sd BOD5/COD eua nude thii gilt md Id 0,526 > 0,5 thich hgp cho xfl ly smh hgc (Ll Hodng Vift & Nguyin Vo Chiu Ngan, 2014) Ty If BODs : N : P = 100 : 9,47 : 1,6 dim bdo dudng cbit (N, P) cho cdc hogt ddng cda vi sinh vat (Le Hodng Vift & Nguyin Vd Chau Ngin, 2014).' _ Ndng-dd;TP"jau xu ly-_cfla ci hai md hinh diu dat QCVfr^5o''ll/BTOMT (cdt B) vi kit qua phan ti'ch ANOVA v i kilm dinh F thi ndng dp TP sau xfl ly cfla hai md hinh khic bift khdng y nghia d mue 5% Trong dd, ndng NHi^ sau xd ly cua LQSH thip hon nhilu so vdi DQSH va khic biet cd y nghia d mflc 5% Hifu suit xfl ty cac chat d nhiem cua 02 md hinh khd cao, ttong dd hifu suit xfl ly cua LQSH cao han ciia DQSH LQSH cd tdng dien ti'ch bl mat cua gia till ldn hon DQSH Hifu suit xfl ly cdc chit d nhilm cfla 02 md hlnb d thdi gian luu nude gid duge frinh bay frong Bang I; Khoa hoc Tif nhien Cong nghf va Moi truong: 35 (2014): 46-53 TQP cbi Khoa hf>c Truong Dai hpc CSn Thff H Nuac thai truac xtr !y S Sau xir ly DQSH ffl Sau xftly LQSH — QCVN 40:20 U c O t B NH4+ Hinh 4; Nong dp cAc chi tieu theo doi trudc va sau xir 1^ bSng fiQSH v^ LQSH Bing 3: Hien suat cua DQSH va LQSH Trung binh hi|u su j t (%) (n = 3) Sau xu ly v&i BQSff Sau xu v&i LQSH SS 70,19 81,77 COD 95,42 96,18 BOD 93,61 95,14 67,76 TKN 73,59 86,72 TP 86,53 70,73 NH4* 83,63 2.2 Kit qua thi nghidm 2: xu ly nude thai bang LQSH a thai gian luu 5,5 gid Kit qua tiu nghifim cho thSy LQSH cho hieu sudt xu ly cao hon va vol thoi gian luu nude la gid nude thai diu ciia LQSH dat QCVN 40:2011/BTNMT (c^t B), do dii nghi?m mo hinh LQSH dugc lira chpn dl tiin hanh thi nghiem vdi thdi gian luu nude la 5,5 gid nhdm myc dich xac dinh thdi gian luu nude t6i thi^u ma d dd budc thai sau xir ly vin dat qui chudn Ndng dd nude thai Uudc va sau xir ly dugc Uinh hay uong Hinh • Nuffc tJiSi trudc xii Iv BSauwlyLOSH — QCVN 40:2011 C9tB COD BOD TKN TP N03 NH4+ Hinh 5: Nong d$ eae chi tieu nhilm trirde vi sau xir 1^ Mng LQSH or tbiri gian lim 5,5 giir Tgp chiKhoa hgc TrudngDgi hgc Cdn Tha Phdn A: Khoa hoc Tv nhien, Cdng nghi vd Mdi Irudng: 35 (2014): 46-53 Othdi gian luu 5,5 gid hifu qui xfl l^" cdc chat d nhiem gidm so vdi thdi gian luu gid Ivy nhien chi tru chi tieu BODs cdc ehi tieu cdn lgi vin dat QCVN 40:2011/ BTNMT (cdt B) Vi vay, tiidi gian luu nude tdi thiiu van hinh LQSH dl cac ndng dd chit d nhilm diu cua nude thdi gilt md dgt QCVN 40:2011/BTNMT (cft B) nen li gid BSng 4: Hifu suit cua LQSH a thdi gian luu 5,5 gid Chi tilu Trung binh hifu suit (%) (n = 3) " SS 70,82 COD 93,78 BOD5 94,78 TKN 63,32 TP 80,74 NH4'^ 75.86 3.2.3 Ket qud thi nghidm 3: ddnh gid hiiu qud xi ly hai giai dogn bdng LQSH kit hgp DQSH Nhu da ttinh bay d ttln, dia quay sinh hgc 10000 thudng duge bd tti ndi tilp vdi de tgo thinh nhilu pha xu ly, thi ngWfm se bd fri DQSH vd LQSH hoat ddng ndi tilp vd mpt DQSH hogt ddng rilng II; hai md hinh dugc viin hanh d ciing thdi gian luu nude li gid, dilu cd nghTa li luu lugng nude thai nap cho md hinh hai giai dogn gip hai lan luu lugng nude thii nj^ cho md hinh mdt giai doan Kit qua thi nghifm dugc trinh bay ttong Hinh Cae kit qui eho tiiay cdng tbdi gian tdn luu, hieu suit eua md hinh hai giai doan cao hon nhieu so vdi md hinh mdi giai dogn Ndng dd TKN vd NH4* cua nude thii diu md hinh hai giai dogn giim mgnh hon so vdi md hinh mdt giai doan vd ndng dp ni-ttat cfla nude thai dau md hinh hai giai doan tang cao ban ndng ni-ttdt cua nude thai dau md hinh mdt giai dogn chung td tdc dp qua trinh chuyen hda ni-ta cua md hinh hai giai doan cao ban nhieu H Nirdc thai trudc xii ly Sau xiir ly mgt giai doan S Sau xu: ly hai giai doan — QCVN 40:2011 cgt A Htnh 6: Nong df cie ehi tieu pban ti'ch trudc va sau xir ly mpt giai doan, hai giai doan Ndng dp COD, BODs, TP, NHi^ sau xfl ly bai giai doan diu dgt QCVN 40:2011 (cot A), ndng df SS ididng dat nliung ttong mpt bf tiiong xd ly hoin chmh phia sau bl xu ly sinh hgc ludn cd bl ling thfl cip di logi bd chit rdn lo Iflng, nhu viy lugng SS ndy se Idng tai be ling tiifl cip Thim vao dd vm lugng SS tiiip thi tdi ngp cbit rin eho bl ling thfl cip se tiiip, giup bl ling thfl cip hogt ddng hifu qui ban (diy li mdt uu diem cua qud trinh sinh trudng bam dinh) Ddi vdi md binh mgt giai dogn ngogi tru COD va TP cdc chi tilu khae diu khdng dat QCVN 40: 2011 (egt A) Kit qua tiii nghifm cho thiy thilt kl dia quay sirih hgc nen thiet ke theo qui ttinh nhilu giai doan dl ting hifu suit xd 1^ Tgp chi Khoa hgc Trudng Dgi hpc Cdn Tha Phan A: Khoa hgc Tu nhiin Cdngn^ Bang 5: Hifu suit xir iy cna q u i trinb six ly mdt giai doan va hai giai doan Cbi tieu SS COD BOD TICN TP NH4* Trung binh hifu snat (%) (n = 3) Sau xir ly mdt giai Sau xir ly hai giai doan dogn 41,56 57,88 96,95 95,91 97,63 94,48 78,89 63,33 85,25 87,70 96,33 76,84 KET LUAN VA BE XUAT 4.1 K£t luSn Co thi sfl dung eic vit lifu gia dung phd bien nhu ong nhua ludn dien, bdng tdm de lam gid the chl tgo dia quay sinh hgc va long quay sinh hgc Tbdi gian gid Id tbdi gian tdn luu nude tdi thieu de LQSH gii the bdng tim xfl ly nude thii gilt md dgt QCVN 40:2011 (cpt B) vdi cac chi tieu theo ddi di nlu Hifu suit xfl ly eic chit d nhilm cua nude thai Id giet md bing md hinh hai giai doan eao hon bifu suat xu ly cda md hinh mpt giai doan Qua frinh nittat hda, khu ni-trat cfla xu ly hai giai dogn xdy tdt hon xd ly mdt giai dogn O thdi gian tdn luu nude gid md hinh hai giai dogn cho nude thai sau xfl ly dgt QCVN 40:2011 (cpt A) 4.2 Se xuat - Do ndng dp chat d nhilm ttong nude thai Id gilt md biln tbiln rdt ldn theo qui ttinh gilt md va cdch qudn ly cfla cac xi nghifp, dd chi dp dung ket qui niy cho cdc xi nghiep cd ndng dp nude thii sau xfl ly sa bf nim frong khoing ndng nude thii dau vao cfla cae thi nghifm d tten Tiln hinh them cdc nghiin eflu ttln nhiing loai nude thai khdc dl ed tbi flng dyng DQSH vi LQSH xfl ly cac logi nude ihii ndy Nen nghiin cim sfl dung cdc logi vat lifu thdng dyng khde ldm gia thi cho Idng quay smh hpc dl dinh gid hifu qud xfl iy, gia thdnh vi dp bin cua cie logi gia the vd Mdi ovdng: 35 (2014): 46-53 TAI Ll£U THAM KHAO APHA, AWWA & WEF (2005) Standard ^ Methods for the Examination of Water and Wastewater, 21* ed Ameriran Public Health Association, Washington DC Grady C P L., Jr., Glen T Daigger, and Henry C Lun, 1999 Biological Wastewater Treatment: Second Edition Marcel Dekker, Inc Lam Minh Trilt, Ll Hoing Viet (2009) Vi sinh vat nude va nude thii NXB Xiy dung Le Hodng Vift, Nguyen Vd Chiu NgSn (2014) Giio ttinh Phuong phip xul^ nude thdi NXB Dai hpc Cin Tha Le Van Cat (2007) Xfl Iy nude tiiii giiu hgp chat Nita v i Phospho NXB Khoa hpc Tu nbiln v i Cdng nghf Hd Ngi LuongDflcPhim(2009) Cdng nghf xfl ly ^ nude thii bing bien phdp smh hpc NXB Giio due Metcalf & Eddy (2003), Wastewater Engineering - Treatment and Reuse, Mcgraw - Hill, New York o Nguyin Dflc Lugng, Nguyin Thi Thuy Duong (2003) Cdng nghe sinh hgc mdi tnrdng tdp NXB Dai hgc Kj? thuit TP HCM Ngd Thi Phuang Nam, Phgm Khdc Lifu, Trinh Thi Giao Chi (2008) N ^ l n cuu xd iy nude thii gilt md ^ a sue bang qui trinh sinh hpe hiiu the bdm tten vit lifu polymere tdng hgp Tgp chi Khoa hpc - Dgi hpc Hui; sd 48 nam 2008 10 Ll Cdng Nhit Phuang, Ll Thi Cim Huyin, Nguyin Huynh Tin Long (2012) Xu ly ' airnnoiiiim^OTig 5^^jtfiii gilt md bing vifcrj ket hgp qui trinh nitrit hda mdt phin/anammox Tgp chi Smh hgc 2012 34 (3se) 11 Sirianuntapiboon S (2006) Treattnent of wastewater containing Cb residue by packed c ^ e rotating biological contactor (RBC) system Bioresource Technology 97 (2006) 1735-1744 ... cao ngudi ta thudng sd dyng nhilu dia quay sinh hpc ndi tilp vdi nhau, mdi dia quay sinh hgc dugc coi li mot giai doan xu I^ Tuy nbiln, vifc ung dung d!a quay sinh hgc d cac nude dang phit triln... 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