Trung tm nc sinh hot v v sinh mi trng nng thn thnh ph (TP) H Ch Minh cho bit, nc ngm tng th hai

trn a bn TP c biu hin suy gim ng ngi. Nng st tng ti nhiu ni cng ch t tiu chun ngun nc loi B, PH trong nc ngm ti nhiu khu vc vn rt thp v ch xng tm cht lng nc loi C.
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Ti nhiu v tr kho st, hm lng nit (NO3 ) hin din mc cao t ngt, ring nc ngm khu vc qun G Vp c hm lng nit vt qu tiu chun nc dng cho n ung. Ngoi ra, nc ngm thuc a bn qun 9, cc qun Th c, Hc Mn, C Chi, Nh B, Bnh Chnh b nhim vi sinh nng nh cc cht vi sinh Coliform, Ecoli lun xut hin trong cc kt qu quan trc

Nhn ra nguy c ca vic khai thc nc ngm ty tin, ngay t thng 5/2007, UBND TPHCM ban hnh Quyt nh s 69/2007/Q-UBND quy nh vic hn ch v cm khai thc nc di t ti mt s khu vc trn a bn. Tuy nhin, vic khai thc tri php vn din ra mnh m.
Theo kho st ca trung tm a tin hc t nm 1997 n nay, hot ng khai thc nc ngm ti TP.HCM ngy cng bng n, lng nc khai thc tng gp 6,5 ln trong vng mi nm, c hng dch chuyn t tng Pleistocen (tng 2) xung tng Pliocen trn (tng 3) v Pliocen di (tng 4). Trong khi , theo cc nh khoa hc, cht lng nc tng 3 bin i phc tp: nc mn n l gp qun 8, 5, Bnh Thnh, mt phn qun 2 v pha ty Bnh Chnh. Cn tng cha nc khu vc ng nam Nh B, Cn Gi hon ton mn! S liu phn tch ch r: s st gim mc nc ngm ti TP.HCM bt u t nm 1996 v n nay, mt s khu vc c tc st gim t 2 3m/nm. iu ny khin thnh ph c s xm nhp mn cc tng cha nc su hn so vi nhng nm trc y! Theo TS Nguyn Vn Ng, phng qun l ti nguyn nc, s Ti nguyn v mi trng TP.HCM, hin nay ngun nc ngm ti TP.HCM i mt vi nhiu thch thc nh: cn kit, nhim bn, b thay i do tc ng ca bin i kh hu. Quan trc cho thy cht lng nc ngm TP.HCM c NO3- (gc axt mnh) cao hn bn ln so vi quy chun cho php, cc khu vc c a hnh cao trn 5m v tng cha nc nng; st (Fe) c ni cao gp gn 100 ln so vi quy chun, xut hin khu vc thp v cc tng cha nc su ASSESSING CURRENT STATUS OF CLEAN WATER IN THE SUBURBAN DISTRICT OF HO CHI MINH CITY Type of publication: Citation: Booktitle: Series: Year: Month: Publisher: Organization: Address: Abstract: Proceedings 1950-1958 Hi ngh Khoa Hc v Cng Ngh ln th 11 11 2009 October Nh xut bn i Hc Quc Gia Trng i Hc Bch Khoa - i Hc Quc Gia thnh ph H Ch Minh 268 L Thng Kit, Qun 10, Tp H Ch Minh TM TT Trong nghin cu ny, i vo nh gi hin trng nc s dng cho mc ch sinh hot v n ung ti cc huyn ngoi thnh Tp.HCM. Vic kho st tin hnh da trn vic thu thp s liu, ly mu nc, iu tra phng vn ti cc h dn trn a bn kho st. Vic ly mu c tin hnh chia l 2 nhm chnh: mu nc ging v mu nc do Trung tm nc sch & VSMTNT cp vi tng s l 80 mu. Tt c mu u ly ti vi nc ra ti tng h dn. Kt qu kho st cho thy ngun nc chnh s dng cho sinh hot v n ung ca ngi dn huyn Hc Mn, C Chi, Bnh Chnh l nc ngm chim t 75 98%, trong t 80 90% l nc ngm do ngi dn t khai thc, cn t 10 20% nc do cc trm cp nc tp trung cung cp. Cht lng nc cho thy mt s ch tiu vt qu tiu chun cho php c th gy nh hng trc tip n sc khe ca ngi dn. i vi kt qu phn tch mu nc ging cc ch tiu vt tiu chun: pH, st tng, mangan tng, coliform. Kt qu phn tch i vi mu nc my cho thy mt s ch tiu vn cha t: pH, st tng, coliform. Huyn Cn Gi v Nh B ngun nc dng cho n ung v mt phn sinh hot ca ngi dn do cng ty cp nc thnh ph cung cp chim t 53 70%, ch yu thng qua cc phng tin vn chuyn nh s lan, xe bn. T l h dn trn khu vc kho st c s dng ngun nc t tiu chun 1329/2002/BYT/Q t khong 25 30%.