Effect of oxygen states in horizontal subsurface flow constructed wetlands on the removal of organic matter, nutrients, some metals and octylphenol - Truong Nguyen, An; Minh Thi Le, Tam; Quoc Tran, Viet; Ngoc Truong, Viet; Thanh Nguyen, Luan; Tan Nguyen, Phi Hoang; Thi Nguyen, Trang Huyen (Science and Technology Development Journal, 2019)