Abstract
In the current period, with the development of economy, science, and technology, people's lives have been improved, leading to increasing demand for water use. Thus, one of the main current concerns is the increased pollution of surface water and groundwater. Especially water pollution by pesticides is a serious problem. In this study, the wastewater treated system, which is including the aerobic biological process and photocatalytic TiO2, used to evaluate the effective treatment of pesticides. Self-generated wastewater was added by a group mixed 8 types of Organochlorine pesticides (OCPs): Tetrachloro-m-xylene,b -HCH,d - HCH, Heptachlor – epoxide, 4,4'- DDE,b -Endosulfan, Endrin – aldehyde, Endosulfan – sulfate and 5 types of Organophosphate pesticides (OPPs): Diazinon, Malathion, Parathion, Ethion, Trithion. The results showed that the COD removal efficiency was over 89,09% for the whole system when maintaining the load of 0,78 kgCOD/m3. day, total retention time was 16 hours. Five types of OPPs was thoroughly treated after going through the system based on its easily biodegradable. For OCPs, the treatment efficiency through the biological process is not high, 6/8 types about 5 - 27% but through photocatalytic TiO2/UV, the treatment efficiency increased 67 - 100% for each type. The results obtained in the study show that the use of the method of combining biology and AOPs is effective for wastewater difficult to treat as pesticides.
Highlights
The results showed that the COD removal efficiency was over 89,09% for the whole system when maintaining the load of 0,78 kgCOD/m3. day, total retention time was 16 hours
Science & Technology Development Journal – Natural Sciences, 4(4):[728-736] Open Access Full Text Article
Summary
Việt Nam là một nước sản xuất nông nghiệp, khí hậu nhiệt đới nóng và ẩm thuận lợi cho sự phát triển cây trồng nhưng cũng rất thuận lợi cho sự phát sinh, phát triển của sâu bệnh, cỏ dại. Thành phần nước thải chứa hóa chất BVTV bao gồm các hợp chất hữu cơ mạch vòng khó phân hủy sinh học họ Chlor (Organochlorine Pesticides - OCPs), họ Phosphor (Organophosphorus Pesticides - OPPs), cùng với đó là hàm lượng độc tố cao của các hợp chất gây nguy hại tới sinh vật và tác động tiêu cực tới môi trường xung quanh. Nhóm vi sinh vật hiếu khí sẽ phân giải các hợp chất hữu cơ cho sự sinh trưởng và phát triển của chúng, do đó làm giảm đáng kể lượng chất ô nhiễm về sau cho quá trình AOPs, tiết kiệm chi phí về hóa chất và năng lượng cần sử dụng.
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