tailieunhanh - Báo cáo khoa học nông nghiệp " Pilot and farm-scale microbial and chemical treatment of waste "

Một loạt các chiến lược cần thiết để đảm bảo xử lý linh hoạt và hiệu quả chất thải từ ao nuôi cá da trơn tại một loạt các loại khác nhau của hoạt động và suốt Năm. Đa dạng hóa học, vi sinh vật và các sản phẩm sinh hóa có thể thích hợp cho mục đích này, một số bao gồm Đó thương mại có sẵn, hiệu quả Mục tiêu của họ ĐÃ không Beens Độc lập thử nghiệm. Vi khuẩn đất Pseudomonas stutzeri, phân lập từ ao cá tra WS thử nghiệm cho ict và khả năng. | Technical Report CARD 023 06 VIE Pilot and farm-scale microbial and chemical treatment of waste RW Bell Cao van Phung Cao Ngoc Diep Vu Ngoc Ut August 2010 Abstract A range of strategies are needed to ensure flexible and effective treatment of waste from catfish ponds at a range of different types of operations and throughout the year. A diverse range of chemical microbial and biochemical products may be suited for this purpose including a number that are commercially available but their efficacy has not been independently tested. The soil bacteria Pseudomonas stutzeri was isolated from catfish ponds and tested for its ability to reduce NH4-N loads in waste water. In laboratory tests at Cantho University promising denitrification activity was obtained but this could not be reliably reproduced in studies at Murdoch University or in tests at CLRRI. Commercially available preparations for waste water treatment were found to be variably effective but the most promising materials assessed were the biological preparations from plant materials Yucca extract and crushed Moringa oleifera seeds. Ozone treatment of the wastewater appears to have a limited role in oxygenation of the wastewater and reducing NH4-N. Aquatic plants with or without fish such as tilapia were promising options for improving water quality in settling ponds. Despite the diverse range of approaches examined no single technology was developed to a point where scale-up to field or operational scale was feasible. Part 1 Isolation of Pseudomonas stutzeri in wastewater of catfish fish-ponds in the Mekong Delta and its application for wastewater treatment This work was published in full by Cao et al. 2009 1 and a copy is appended Appendix 1 . A brief summary of the findings are outlined below. The presence of nitrogen in wastewater discharge is undesirable for several reasons free ammonia is toxic to fish and many other aquatic organisms and the presence of nitrite and nitrate ions in drinking water is a .