Nghiên cứu công nghệ bùn hoạt tính hoạt động theo mẻ có giá thể kết hợp lọc màng SBMBMBR xử lý chất hữu cơ và nitơ(tổng) trong nước thải thuộc da

TAP n i NAT THEU IHCH, liP II, X MVZIIS Nghien CLPU cong nghe bun hoat tinh hoat dpng theo me co gia t h i ket hop loc mang - SBMBMBR XLP ly chit hOu cc va Nito (tong) nu'dc thai thuoc da T r d n V a n Linh N g u y i n VSn Phir6>c • N g u y i n Thj Thanh Phu&ng Vl^n MOi trudng v4 T4i nguySn, OHQG-HCM (Bill nhgn 08 thang 07 nSm20l4 nhdn dang ngdy 04 thdng 12 ndm 2014) TOM T A T Cdng nghd SBMBMBR batch moving (Sequencing bed membrane bioreactor), kit hQp qud trinh IQC mdng MF h$ bOn 'ho$t tinh v&i gid thi Iwu ddng Anox Kaldnes K2 (MBBR) theo chi dd ho^t ddng theo md (SBR) dd dwoc nghidn ciru di ddnh gid khd ndng x(> /)? chit hO-u eo vd tdng nita cOa nw&e thdi thudc da Sau 170 ngdy vdn hdnh, hidu suit din xCf i'jf COD dao ddng tif 95,9±0,3% 0,564±0,019 din v&i suit trpng 1.207±99 Twang img hi$u suit dwge tif tdi 30,0±4,9 xt> 1^ COD din 89,2±0,6 thay ddi kgC0D/m3/ngdy xw ly Nito tdng d^t 65.9±13,3% cao nhit t?i tdi Hi$u 0,72±0,02 kgC0D/m3/ngdy Hidu suit xi> /y tdng nito Id 10,8±5,4% thip nhit t^i tai trQng 0,327±0,020 kgTN/m3/ngdy Trong th&i gian nghien cOu, hidu qud bdm dinh cua vi s/n/j vdt idn gid thi gin nhw khdng ddng ki V&i ndng MLSS todn thl nghidm 6.808±226 mg/L cdc kit qud phdn tich cho thiy sinh khdi It biin ddng Khi dd mdn tdng tir 3.500 Idn-8.000 mgCM thl hidu suit xt> ly COD vd tdng nito gidm Tuy nhidn sw ehuyin hda nita tfi/pc cdi thidn vd SI/ phuc hdi sinh khdi v&i biin ddng cua tdi trqng khd nhanh TO' khda: mdng, bi phdn Ong theo md, gid thd di dgng, nw&c thai thuoc da I.O^TVANDE Thu^ da li ngdnh cong n^i^p cd phdt thai gdy nhiSm mfii trudng dudi cd ba d?ng: rdn, Idng vd Nudc thdi thupc da cd tinh chdt phuc t9p Id t9p h^p cua nhifiu ddng thai khic nhau; duq'c d$c tnmg bdi nong dp COD, chat rdn la lung cao Bfin canh dd, nudc thdi ndy cdn chua cdc chit gdy dc che qud trinh xu ly sinh hpc nhu sunphit, clorua, crom Hifin d Vi§t Nam mfit sfi giii phdp xu l^ nudc thai thupc da dang dupc dp d^ng nhu tdch md, keo t^, xd ly sinh hpc (kj vd hiiu khQ vd oxy hda bdc cao (ozon, fenlon) Tuy nhifin, hieu qud xii I3? cic chdt nhilm thip mi nguyfin nhan chinh Id thdnh phan nudc thai chua dfing thdi chat huu ca, sunphit vd cfi dfi mdn cao ldm dnh hudng den hoat dpng ciia he thong sinh hpc Cfng dung cua qud trinh Ipc mdng de xu ly nudc thai dfi thi, nudc thdi cdng nghifip nhu chfi bifin thuc phdm, 16 giet mo va nudc ri rac di dupc dfi cap frong nhifiu tdi lifiu Cdng nghfi MBR dupc ua chupng vd ap dpng rpng rdi cho xu ly nudc thdi cong nghiep khd ndng chiu tdi trpng cao vd dien tich su dung tuang dfit nhd Ddi vdi xu ly nudc thai dd tfai vd xudng sin xudt frong khu dan cu, quy trinh lpc mdng frd nen kinh tfi hon cfing ngh# nhd gpn la can ihifil dfi phu hap voi su ban Trail 55 Scieice ft Tecbietsii leieltiieil, Vol 18, III0.MV Z015 chfi vfi khfing gian hoac cdc yeu cau nghiem ngat ve tai lupng va nfing dp d nhifim He vj sinh v^t ciia chdt lupng nudc thdi dau Bfin canh dfi, cfi nong dp cao, da dang vfi chiing loai (vi sinh cfing nghfi SBR cd difin cung nhu Ioai cai tifin bdm dinh vd la iiing); xti ly hieu qua him Iupng SBBR cung dd thfi hien uu thfi cua nd thfing qua hdu CO v i nito va cfing nghfi cho phep lifit kifim cic nghifin ciiu, iing dung thuc te tren the gidi difin tich dit su dung nhd dp dung MBR [5] cung nhu frong nudc Tu nhan djnh trfin, mfi hinh SBMBMBR dupe dfi xuat cho nghifin cuu xii ly nudc diai thupc da vdi muc tifiu la ddnh g i i khd ndng xii ty COD, N vd mpt so thinh phdn nhifim ddc trung khac, Iim co sd xay d^mg cong nghe thich hpp xii ly nudc thai thupc da difiu kien Vi^l Nam Cfing nghfi SBMBMBR dd dugfc nghifin ciiu boi nhieu nhd khoa hpc trfin Ihfi gidi Trong dd, nghien ciiu cua Chye-eng Seng vd cdng su (2012) [1] dd chung minh he thong co khd ndng xu ly 80% COD vd % N-NH4*; nghien cuu khic ciia loannis Vyrides va David C Stuckey (2011) [2] cho hieu qua xu ly COD khoing 70%; W G Scholz vd cfing sir (2006) [3] nghifin cuu xii ly nudc thii thudc da bdng cong nghfi kfit hpp ( MBR vd RO) dat hieu qua xu ly COD vd Ifing nito ldn lugt Id 85-90% vd 95% Nghien ciiu khac ciia R Mendez vd cfing su (2003) [4] dat hifiu qua xu ly COD Id 90% vd Ifing nita Id 90% Nghifin ciiu iing dung cfing nghfi bun hoat tinh hoat dfing theo me c6 gid the ket hpp vdi lpc mang SMBMBR cd nhieu uu difim nhu dam bio MO HINH VA PHl/OtNC PHAP NGHIEN CIJ'U 2.1 Vat lifiu nghifin cihi Nudc thai dimg frong nghien cuu dupc lay sau qud frinh tifin xu ly cua cfing ty thufie da Ddng Tu Ky tai Khu cfing nghifip Nhan Trach I, Ddng Nai Nudc thdi sau dua ve phfing lhi nghiem dupc bao qudn lanh mrdc dua vao Ihifil bj Thinh phin v i tinh chat ciia nudc thai dupc frinh bay d bdng I nhu sau: he Ihdng hoat dpng fin dinh, chju dupc bifin dong Bang I Thinh phin va tinh chat cua nudc thai thupc da Thdngs6 pH Donvi OOdtic COD BOD TKN NTU Crom long S SO,- cr 150 0.3 OJ 200 137 240 12.2 0,8 761 200 SS mg/L 7.19 114 1300 500 165 7,82 292 2.390 1.190 550 Gia In tmng binh 4-8 Biin cdy ban ddu frong md hinh nghien cdu dupc liy lai dudng luan hoin vfi bfi anoxic frong he thflng xu ly nudc thii bing cong nghfi bun hoat tinh su dung cfing nghe A'O tai fram -xu ly nudc tip frung Khu cfing nghifip Long Binh, Ddng Nai Bun cdy niy cd miu nau sang, ndng ldng tfit vdi SVl < 100 vd co ty le MLVSS/MLSSIdO,70 Gid thfi ddng su dyng irong md hinh thi nghifim Id Anox Kaldnes K2 vdi dudng kinh 15mm, chieu cao 12mm, tdng dien lich bfi mdt Id Trang 56 TP 350 mVm-" frong dien tich bfi mil dfi dfing la 228 nr/m^, khfii Iupng rieng Ii 950 kg/m^ Ming MF CO kich Ihudc khung la 300 x 300 mm, gfim cfi bd spi, mfii bo soi co 75 spi va chifiu dai 180 mm Tdng difin tich lo mdng la 0,36898 m" Mdng boat dpng vdi thdi gian loc la 200 s vd ngung 30 s Khi dp sudt mdng Ifin tdi tdi khodng 30 kPa thi qud frinh rua ngupc sfi difin irong thdi gian phiit Cdc thfing sfi ciia ming dupc trinh bdy d bang lAP Ml PIAl H E N IUCN, TAP 11, Sd Ml-ZOIS Bang Thfing sfi ky thudt cua ming MF (Litree) Thflngsfl Chi so nux Dan vj l/m'/h K h o ^ g giA Irj 15-60 Vjll lieu PVDF Ouong kinh tnmg/ngoai Kich thin^ Ifl IQC A p s u t v ^ hanh tdi da mm ^m kPa 0.85/1,45 0.2 60 Nguon- LITREE Purifying Technology Co Ud 2.2 Mo hinh nghien cihi Mfi hlnh nghien ciiu chinh Ii be phin ung bdng mica cfi kich thudc D x W x H = 330 * 240 X 700 mm Be cd hai ngin dupc phan chia Iheo ti lfi 1/4: ngdn thu nhat chiia mang vi ngdn thu hai cd gid thfi Hai ngin dupc ngin cich bing tam due lo dudng kinh 5mm cich lOmm Ngin thu hai cfi bo fri them cinh khudy hai ting cinh, dudng kinh 150mm de khuech tanfrongpha thieu Lupng gii thfi cho vio mfi hinh MB - SBR chifim 10 % thfi tich phdn iing Bim cho vdo mfi hinh vdi nfing ban diu 10.000 mg/L.Tfing thai gian luu bim SRTfrongloan bfi Ihi nghiem Id 25 ngiy Mfi hlnh dupc difiu kien tu dpng hodn lodn nhd bp difiu khifin PLC (Programmable logic confroller) So dfl mfl hinh nghifin ciiu dupe bfi fri nhu hinh dudi diy Nudc vao Hinh I Md hinh nghien ciiu Bang Thfing sd thiet ke mfi hinh SBMBMBR Thflng sfl Don GiAtn Oia Rong Cao mm mm mm 330 250 700 Tf \K ngan MBBR/MBR 4,01 Vong quay canh khuay Duong kmh khuay Luong gia Ih^ MBBR vong/phut m % 10-175 150 10 2.3 Trinh ty lh( nghifm 2.3.1 N$i dung I: Khao sdt hifu qua xu ly ch^t hOii CO- vd tfing nittr vdi cdc che dp van hdnh khde Di^n tich Aplirc nia mang m^ kPa 30-60 Nudc thii ddu vio c6 ndng dp COD frung binh Id 1800 mg/L pH dupc fri frong khodng tu 6.5 - 8,5 DO frong ngdn thifiu dupc kifim sodt khoang 0-0,1 mg/L; ngan Traig 57 Scieen S TechieHii kfHiRMel, Vei 18, Ne.MV 201S hifiu khodng tu - mg/L Hdm lupng bim dupe tri vdi nfing dp MLSS khoang 6800 mg/L Thi nghifm SI: Cfi dinh tai trpng, thay dfii thdi gian lini va mirc rut ntrdc Tii trpng COD dupc cd djnh d miic 0,5 kgCOD/m^/ngiy, thdi gian luu, muc nit nudc Ihay ddi vi dupc trinh bdy bang Thi nghifm S2: C6 dinh mirc rut nudc, thay ddi tai trpng TaifrpngCOD cua thi nghidm S2.I, S2.2 vd S2.3 lin luot la 0,7 l^OD/m'/ngdy; 0,9 kgCOD/m7ngiy vd 1,2 kgCOD/mVngdy C6 djnh muc nit nudc Id 35 % g Thoi gian luu nudc vd muc nit nudc tbi nghiem SI vd S2 Thong so Tai Irong hQu co HRT N^pnixoc Thieu Hieu Ichi TTlicu Ichi Hieu Rilt nudc D COD gidm ddn Ichi tai trpng ting Sd dT cd dieu ndy vi tai trpng tdng, sinh khdi khong du thai gian Kfit qua nghifin cuu d thi nghiem Sl cho thiy tdng min: nit nudc v i gii^ nguyfin tai frpng thi hifiu qud xu ly tfing nito gidm manh Id 65,9 ± 13,3 % xufing cfin 32.4 ± 7,6 % muc nit nudc cao, dp kiem d ddu cung cao hon Difiu chiing td ndng nitrat hoa frong mfi hinh gidm Bfin canh dfi, rut nudc nhifiu dfing nghTa vdi lupng nito vdo (ngay sau pha nap nufifc) Ifin Hdm lupng ammonia Xtf cao cd thfi gdy tic chfi vi khudn oxy hfia ammonia (AOBs Ammonium Oxidizing Bacteria) vd vi khudn oxy hda nitrit (NOBs - Nitrite Oxidizing Bacteria) khifin sir chuyfin hda nita gidm suL Ham lupng ammonia tu frong bfi sau pha nap nudc tiii nghipm S l l , Sl-2, SI.3 lin lupt Id 2,88 mg/L; 5,93 mg/L vd 23,73 mg/L Theo A.C.Anthonisen (1976) [6], ammonia tu ire chfi vi khudn Nitrosonomonads vd Nitrobacters Id 10 - 150 mg/L vd 0,1 - 1,0 mg/L Trill 59 Sclnce ( l e c h i l i i i DenlDiiul, Vol 18, acMI- 201S i S.) 5L: COD •|"N D9 m^in CI" Vao Ra Vao Ra M4 Theo ehe thi ngi lem S2.1 (HRT 22h riit nudc 35%) mg/L mg/L mg/L mg/L mg/L 3.035 ± 549 L894±55 77.8 ± 4.9 505 ± 24 351 ±53 Vdi dp mdn ting dan tir 3.500, 5.000, 8.000 mgCr/I lin lupt frong cac lhi nghifim M l , M2, M3 hieu suit xu ly COD gidm din tu 95.9 i 0,3 % xudng cdn 93.7 ± 0,4 % Khi mdn gidm frong Ihi nghifim M4, hieu sudt din dupc cdi thifin, d?t 94,9 ± 0,5 % vdn thap so vdi lhi 000 1.867 ±21 II5.I ±8,0 472 ± 16 387± 13 8.000 L855±25 M7.1±7.3 457 ± 28 399 ± 24 3.500 1.884 ±33 96.4 ± 9.5 467 ± 18 393 ± 26 nghifim MI (95,9 ± 0,3 % ) Difiu la sinh khdi chua kip fin djnh sau su sdc Kfit qui nghifin ciru phii hpp vdi nhin djnh cua Jang Duksoo (2012) [7] tifin hdnh khao sdt khd nang xir ly COD vdi dp mdn Idng ddn Ki dfin 9.400 mgCr/L, hifiu sudt thu dupc lufin Trang 60 TAP H i PIAT TIIEN II&CN, TAP 18, Stf MI-ZOIS frfin 95 % Lefebvre va cpng sy (2005) [8} dat dupc Idn lupt Ii 95 % va 96 % Difiu ndy cho nghien cuu cfing nghfi SBR vdi nudc thdi lhu0c thay su dnh hudng cua dfl mdn tdi hieu suat xii ly da cd dp mdn khoang 15.000 mgCI'/l cho kfit qui COD Id khdng nhifiu dfii vdi vi sinh vdt ua mdn tfii d i thich nghi uu d HRT ngay, lai frpng 0,6 kgCOD/mVngdy Hieu suit xu ly COD va TKN W4 X -'* ^ „ ^ X"' " -^'V •"''' '»' Cki»Wfa>lrl>llii>lisSll '"%-'''^! " v - i ' X " ' (VliMltebBkifksSIl Hinh Hi^u suit xiir ly COD vd Tong nita d cdc dp mSn khac Khd ndng xu ly nita giam dp mdn tdng Hipu suit xu ly TN frong thi nghiem M l , M2, M3 lin lupt la 30,1 ± 13,0 %; 17,9 ± 2,6 % vd 12.8 ± 3,3 % Nguyfin nhdn Idm gidm hifiu sudt xu ly TN la dp mdn tdng sfi lam giim ndng bay hai ciia ammonia (do co sy lifin kfit ion) Mfit sfi nghien cim trudc day nfii chung vd ciia tdc gii Stephen Spotte (1983) [9] ndi rieng xdc djnh mdi quan he giua dp mdn vd FA cho thay dfi mdn tdng thi ham lupng FA giam Tuy nhifin vific xdc dinh cu thfi m6i quan hfi ndy sfi khfing dfi cap tdi frong nghifin cihi ndy p d n g Ihdi cdn nguyfin nhan khac dnh huong tdi hieu sudt xu ly, dd Id dp mdn cdng Idng, DO giim inh hudng dfin kha ndng nitrat hda vd khu nilral Idm hifiu suat xu ly N gidm Q u i frinh nitrat hfia cd thfi dien d nfing dp mudi 20.000 mgCF/l, voi ti lfi nitrat hda Ifii da mgN/gVSS/h Sy tdng nhanh nfing dp mufii sS dc che q u i frinh nitral hoa Khi ndng nitrat hfia sfi gidm tir xudng mgN/gVSS/h dfi mufii Idng Iu Ifin 30.000 mg/L Ngodi ra, qua thi nghifim vdi sy sfic man Ifin tdi 33.000 mgCf/l d i cho Ihiy sy phuc hdi nhanh chdng cua he thfing sinh hpc hifiu [8] Do vay, kfit qud thu dupc tu nghifin ciru thyc nghiem fren mfi hinh SBMBMBR Id tuong dfing vdi nhimg nhin djnh frudc ddy dinh gid inh hudng cua dp mdn len sy chuyfin hfia nita Qua hinh 5, ta thdy vdi dfi mdn tdng, nfing dp MLSS khfing bien dpng nhieu nhung ti IS MLVSS/MLSS cd giam nhe Trong thi nghifim M4, ti le ndy cfi sy phuc hdi thoi gian chay 10 ngiy Nhihig ket qua thu dupc tuang ddng vdi nghien cuu cua Jang Duksoo (2012) [7], Nhu viy, sau 32 ngiy vdn hdnh thi nghipm khio sat sy anh hudng dp man, ta thdy rdng hipu sudt xu ly COD va TN gidm theo chifiu tdng cua Tpiii Gl ScleiccftTKlimn leieliiint, Vil II, N1.MI- 2015 dp mdn Md hinh cung cho thay khd ning phuc MLVSS/MLSS cfi gidm nhe tiieo chieu tdng d$ hdi bj uc chfi cua dp mdn khd nhanh, sy bifin man dpng sinh khfii cting khfing nhieu, ti lfi Hinh S Nong dp NO^" NO/ MLVSS MLSS va ti so MLSS/MLSS iheo timg dp mdn 3.2.2 Nong dp FA (Free ammonia - Ammonia ndng dp crom, sdt, sunphit sunphat Sy chuyfin t y do), FNA (Free nitrous acid - Axit nitric t y hda ciia N-NH4* timg mfi phy tiiufic vdo sy do) bifin thien nfing dp FA, FNA dupc thfi hifin tai Cd nhifiu yfiu Ifi anh huong dfin hieu sudi xu Iy COD v i tdng nito, bao gfim nfing dp sinh khdi, thdi gian luu biin SRT, thoi gian luu nudc HRT, pH, dang co chit, Tuy nhifin yfiu tfi chinh inh hudng dfin sy chuyfin hda nilo chinh la ti lp C/N, nfing dp FA, FNA Qua nghifin ciiu thyc nghiem frfin mfi hinh SBMBMBR cho thdy d difiu kien thi nghifim ndng dp FA cao Id nguyen nhdn fryc tifip dnh hudng toi sy chuyfin hda niio Ben canh dd cdn cfi sy lic dpng cua Hinb Nong dy FA, FNA va hieu suit chujin hoaNH,' Trang 62 hinh Khd nang chuyfin hda N-NH4* tdng vdo cudi mfi xu ly, dieu l i ndng dp FA giim vdo cufii me, tao dieu kien cho vi khudn AOBs boat dpng TTieo A.C.Anthonisen (1976) [6] nong dp FA khoang 10 -^ 150 mg/L se giy ire chfi vi khudn Nitrosonomonads vd 0,1 -^ 1,0 mg/L dpi voi vi khuin Nifrobacters Nong dp FNA gdn nhu khdng inh hudng tdi sy chuyfin hda ndy bdi nfing dp q u i thip Hinh Chi so Fliw a cac lhi nghiem TAP Cii PUT TIEN llftCN, TAP 18, U M1-ZQ15 Chi sfi Flux d cdc thi nghiem duoc bifiu thi kgCOD/m^/ngay vd ti sfi F/M 0,15 Tuong ung, tren hinh Ming lpc dupc nia ngupc vd ngdm tai uong nita dao dfing 0,103 ± 0,044 dfin 0,268 hda chdt d ngiy thu 96 Sau 96 ngdy hoai dfing, ± , kgTN/m'.ngay hieu suit x u l y tfing nito ddng 16 xudng dat 30.0 ± 4,9 dfin 65,9 ± 13,3 % Chfi dp van lOIil/m'/h Dflng thdi, dfl mdn tdng thi chi sd Ihdm qua mdng gidm tir hinh thich hop dupc dfi xudt bao gfim: ldm day, Flux cung giim manh Difiu ndy da dupc dfi cap tiiifiu (2h), hifiu (6h), tiiifiu (6h), hifiu frong nghien ciiu cua ciia Jang Duksoo (2012) (2h), ling vd rut nudc Trong dd, thdi gian [7] luu nudc la 22h Trong Ihdi gian nghien cuu, KET LUAN hieu qud bdm dinh ciia vi sinh vit len gii the gin Ket qua nghien ciiu xu Iy nudc thdi thupc da frfin mfi hinh SBMBMBR (Sequencing Batch Moving Bed Membrane Bioreactor) da xdc dinh: Hifiu sudt xu ly COD dat 89,2 ± 0,6 dfin 95,9 ± 0,3 % vdi tii frpng hitu co thay dfii 0,564 ± 0,019 dfin 1,207 ± 0,039 kgCOD/m7ngdy Hifiu suit xu ly COD cao nhdt tai tdi frpng 0,72 ± 0,02 nhu khflng ddng ke Vdi ndng MLSS toin thi nghiem 6.808 ± 226 mg/L cdc kfit qua phdn tich cho thiy sinh khfli it bifin dpng Khi dd mdn tang lit 3.500 len 8.000 mgCI/l thi hifiu suit xu ly COD va tflng nita gidm, Tuy nhifin sy chuyen hda nito dupc cdi tiiifin vd su phuc hfii sinh khfii vdi bien dpng ciia Iii frpng khd nhanh Stuydy on sequencing batch moving bed membrane bioreactor technology (SBMBMBR) for the removal of organic and total nitrogen in tannery wastewater • Tran Van Unh Nguyen Van Phuoc Nguyen Thi Thanh Phuong Institute for Environment and Resources, DHQG-HCM ABSTRACT The SBMBMBR technology (sequencing batch moving bed membrane bioreactor) a eombiantion of membrane filtration MF process in activated sludge with sequencing batch (SBR) moving bed using Anox Kaldnes K2 (MBBR) has been studied for the removal of organic and total nitrogen in tannery wastewater After 170 days, reaseareh results showed that the COD removal efficiency was ranged from 89,2±0,6 to 95,9±0.3% when the organic loading rate changed ftom 0,564+0,019 to 1.207±99 kgCOD/m^/day The total nitrogen removal efficiency reached 30,0±4,9 to 65,9±13,3 The highest COD removal efficiency was 0,72±0,02 kgCOD/m^/day The lowest nitrogen removal efficiency was 10,8±5,4% at 0,327±0,020 kgTN/m^/day of nitrogen loading rate During the research, the adhensional tension of microorganism was The unchanged biomass remained insignificant with TriigSS scieice & TecbiBlBif Beielipieit, Vol 18, Ne.MV 2015 6.808±226 mg/L of Mixed liquor solids (MLSS) suspended However, the conversion When the salinity went up improved and the of nitrogen recovery of was biomass ftom 3.500 to 8.000 mgCIA the COD and following the changed loading rate was quite nitrogen fast removal Keywords: efficieney decreased membrane, sequencing batch reactor, moving bed, tannery wastewater TAI LIEU THAM KHAO [I] Chye-Eng Seng, Jun-Wei Lim, Poh-Eng Lim, Enhancement of nifrogen removal in moving bed sequencing batch reactor with intermittenl aeration during REACT period Chemical Engineering Journal, 197, 199203 (2012) [2] loannis Vyrides David C Stuckey, Chromium Removal Mechanisms and Bacterial Communilyin an Integrated Membrane Bioreactor System, Environmental engineering 661-670(2011) science, 28, [3] W G Scholz, P Rouge, A Bodalo, and U Leilz, Desalination of mixed tannery effluent with membrane bioreactor and reverse osmosis treatment Environ Sci Technol, 39, 8505-8511 (2005) [4] R Mendez A Gollara, J Martinez, Carbon and nifrogen removal from tannery wastewater with a membrane bioreactor Water Science and Technology, 48(1), 207214(2003) Trang 64 [5] Simon Judd The MBR book: Principles and applications of Membrane Bioreaclors m Water and Wastewater Trealmenl Elsevier 163-205(2006) A C Anihonisen, R C Loehr, T B S Prakasam, E G Srinath, Inhibition of Nifrification by Ammonia and Nifrous Acid, Water Pollution Control Federation 48 (5), 835-852(1976) [6]- Jang Duksoo Effect of Salinity Variation on Treatment Performance Characteristics and in a Membrane Sludge Bioreactor Master's Thesis, Korea Advanced Inslitule of Science and Technology, 47-51 (2012) [7] O Lefebvre, R Molella, Treatment of organic pollution in indusfrial saline wastewater A literature review Water Research, 40, 3671-3682 (2006) [8] Stephen Spotte, Estimation of the allowable upper limit of ammonia in saline waters Marine Ecology', 10, 207-210(1983)  ... phin tich theo cdc phuang phdp frong Standard Methods for Ihe Examination of Water and Wastewater (APHA, Eaton DA, and AWWA) tai phdng tiii nghifim Vien Mfii frudng vd Tai nguyfin - Dai hpc qufic... cong nghe thich hpp xii ly nudc thai thupc da difiu kien Vi^l Nam Cfing nghfi SBMBMBR dd dugfc nghifin ciiu boi nhieu nhd khoa hpc trfin Ihfi gidi Trong dd, nghien ciiu cua Chye-eng Seng vd cdng... Vyrides va David C Stuckey (2011) [2] cho hieu qua xu ly COD khoing 70%; W G Scholz vd cfing sir (2006) [3] nghifin cuu xii ly nudc thii thudc da bdng cong nghfi kfit hpp ( MBR vd RO) dat hieu