5.1. Ket luan.
Chung toi da tien hanh thf nghiem xem xet kha nang lam sach ngu6n nuac thai sinh hoal eua mot so loa, thuc xat, cu thé ôday la cac loai cay; rau muong, ngd daị khoai nuac, saỵ Kha nang xir ly nuoe thai cua he thong na> la rat kha quan. Ket qua thu duge nhu sau:
+ Muc do 6 nhilm eiia nuac song To Lich tai khu vuc nghien círu la tuong doi nang, ham lugng PO, :2,52mg/l, NH,:9,85 mg/k COD:284 mg/l nuac song mau den. miii hoi thoị
+ Doi vai he thong rieng rẹ eay say cho ket qua xir ly cao nhat( Cc4e
thong so CO the dugc xir ly toi 90%), sau do den khoai nuac va ngd dai
cuoi cung la rau muong. Thoi gian luu nuac hgp ly nhat cho vice xir ly la 8 ngaỵ
+ Ciing mot thoi gian luu nuoe nhirng he thong ket hgp 3 loai eay cho ket qua tot han ro rang, hieu qua xir ly cao han 10-15% so voi trong cac loai thue vai rieng rẹ Thai gian luu nuoe tot nhat cho xir ly nuac cung la 8 ngaỵ
+ Hieu qua xir ly bang thuc vat thé hien ro nhat a eac thong so: SS (87,9%), COD(80,8%), P04(84,8%) thong so NO, co ket qua xir ly kem nhat (32,4%)).
+ Trong 15 ehung vi khuan phan giai chat húu co dugc ehgn de phan lap, cac ehung eo kha nang phan huy tinh bgt. xenllulo, hemixenllulo cao la 1. 2. 8, 11. 15. Trong do phan huy cua ehung 2 la cao
nhat (4.8 cm sau 10 ngay). roe do phan hiiy tang dan tir ngay &ku den
ngay thl> 8.
+ Trong mau 11 dirge ehgn diing de nhan len va mang xir ly co eac chiing 1. 4. 6. 7. 8. 9. 10. 11 e6 kha nang phan giai ni tọ chiing so 11 kha nang tao nhieu NHi^nhat (\oi pll Ion nhat la 8.5).
+ Vi khuan dugc phan lap co kha nang phan hu\ cac chat huu co tot. Ham luona NIL tana dan tir 8.7 ma/1 len 14.6 ma/1 \ a i 15 ml dich khuan. PO4" cung tang tu 0,125 len 0.28 mg/l ehung to \i khuan boat dong ed hieu quạ Cae vi khuan dirge phan lap boat đng tdt trong he thdne xu ly, do đ hoan toan ed kha nane nhan rone md hinh naỵ
5.2. Kien nghi cho cac nghien ciili tiep theo
+ Phan tfch kha nang xii ly ciia thue vat đi vdi cae thdng sd khac, dac biet la eac thdng sd kim loai nang: As, Pb, C s . . .
+ Nghien euu kha nang xii ly nude thai eiia mot sd loai thue vat
khac phu hgp vdi diiu kien khi ban Viet Nam.
+ Xem xel bien phap tai su dung sinh klidi sinh hge tu thue vat mot each hgp ly sau mdi thdi gian xu ly nudẹ
TAI LIEU THAM KHAỌ Tai lieu Tieng Viet Tai lieu Tieng Viet
1. Trinh Xuan Lai,2000. Giao trinh tfnh toan thiei ke eac cdng trinh xu ly nuude thaị - NXB Xay dung.
2. Tran Van Nhan, Ngd 7Tii Nga, 2002. Giao trinh cdng nghe xii ly nude t h a i . N X B K H & K T , H a N g i . .
Tai lieu tieng Anh.
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Water ResearebLaboratory, Hawkesbury Agricultural College, Richmond, NSW. Australiạ
2. Cooper, P.P., Inndlater, B.C., Editors 1995. Constructed Wetlands in Water Pollution Co/itrol. Pereamon Press, New York, NY
3. Cooper, P.[. J.Ạ Ilobson. 1990. Sewctge Treatment hx Real Bed Sysiems.'thc Presc/it Situation in the United Kingdom in: Constructed
Wetlands for Wastewater Treatment: Municipal, Industrial and Agricultural, D. Hammer, 153-171, Lewis Publishers, Chelsea, Ml. 4. IS Sas 1992.- Strategies for the environment. Via Volterrana 183,
Cerbaia V.P., 50020^ Florenee,PubliSer S.p.Ạ - Via Garigliano 1, 50053, Lmpoli, Florencẹ Italy
5. Reed, S.C, D. Brown. 1997. Constructed Wetland Design -The First Generation. Jour. W F ; F \ 64(6), 776-781.
6. Steiner, G.R.. J.T. Watson, K.D. Choatẹ 1990. General Design, Construction, and Operation Guidelines for Small Constructed Wetlands Waste water Treatment.