Cac phvfdng p h a p oxi hoa tang cildng (Advanced Oxidation Processes, AOP) Ik mot loai phildng p h a p xii ly nii6c bang hoa hoc c6 hieu qua cao. AOP ri't hieu qua trong
viec loai bo h a n g loat cac chat 6 n h i i m hiiu cd kho p h a n huy nhii cac fenol, foocmandehit, cac c h a t h ^ u cd de hap t h u lien ket v6i cac halogen (AOX), cac chat thuoc nhom thuoc triif dich hai...ra khoi cac nguon nil6c m a t ciing nhil niidc thai. Cac qua
trinh nay x^y r a t r e n cd s5 cua sii xuKt h i e n cac goc hydroxyl tii do c6 the dien hoa r^t cao. Chinh qua t r i n h sinh goc tii do nky da tao dieu kien phm hdp cac chat oxi hoa
thong thiidng nhii HgOg, O3 hoac O2 v6i tia UV hay ion kim loai de trS t h a n h he thong xiic tac ciic m a n h cho cac q u a t r i n h oxi hoa. Cac goc h i n h t h a n h da tac dung v6i cac chlft hiiu cd va p h a n huy chiing t h a n h cac chat ddn gian hdn hoac p h a n huy den t a n cacbon dioxit va n\i6c. Co h a n g loat cac p h a n iing d i n den viec hinh t h a n h cac goc
hydroxyl: vi du nhii cac p h a n iing cua OaAJV (HoH et al., 1997), HaOaATV, Fe^^/HaOa
(Fenton oxidation), Fe^^/HsOaAJV (Goi, 2002) hay TiOa^JV (Arslan et al., 2000). Ta:t ca
cac qua t r i n h nay deu thuoc nhom AOP vk p h 4 n 16n chiing khong phii hdp cho x\i ly
nii6c thai do yeu c^u ve n a n g liidng dien cao, cac thiet bi can thiet cho qua trinh nhxi may p h a t ozon, den UV...Tuy nhien, p h a n iing Fenton (H2O2, Fe^*) lai r a t phii hdp khong nhiing vi cac tac n h a n sii dung r e va r a t d l kiem ma con la nhiing ch^t khong doc hai v^ qua t r i n h xiic tac x^y r a trong he dong the (Lopez et al., 2004). P h a n iing
Fenton diidc s\i d u n g de x^i ly nii6c t h a i tii nhiing n a m cuol th^ip ky 60 cua the ky tni6c,