PHD dissertation summary Land and water environment: Using wastewater from intensive catfish pond for irrigating paddy field

Objectives of the study: Assessing the situation of catfish farming in some areas of the Mekong Delta as a basis for proposing measures to manage waste from catfish ponds; the survey and analysis in catfish ponds to assess the composition and characteristics; assessing the pollutants load of waste water from catfish ponds; assessing the possibility of wastewater treatment from catfish ponds and benefits of environmental when using wastewater for irrigating paddy fields.
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PHD dissertation summary Land and water environment: Using wastewater from intensive catfish pond for irrigating paddy field MINISTRY OF EDUCATION AND TRAINING CAN THO UNIVERSITY PHD DISSERTATION SUMMARY Land and water environment Code: 62 44 03 03 DANG QUOC CUONGUSING WASTEWATER FROM INTENSIVE CATFISH POND FOR IRRIGATING PADDY FIELD Can Tho, 2015 WORKS TO BE DONE IN CAN THO UNIVERSITYThe scientific guidance: Assoc. Prof. Dr. Truong Thi NgaThe thesis will be defend against the council state dissertation meeting at the:At time day month yearReviewer 1:Reviewer 2:Dissertation can be found at:Learning resource center of Can Tho University.National library of Vietnam. LIST OF PUBLISHED WORKS1. Dang Quoc Cuong, Truong Thi Nga and Tran Thi Diem Phuc, 2014. Effects of using rice fields to treat polluted water of catfish (Pangasianodon hypophthalmus) pond. Journal of science, Can Tho University. No 3. ISSN 1859-2333.2. Dang Quoc Cuong and Truong Thi Nga, 2015. Improvement of water quality by utilizing wastewater from catfish ponds for rice field irrigation. Reasoning, science and business journal of the Ministry of Natural Resources and Environment. No. 1+2 (2015). 53-55 pages. ISSN 1859-1477.3. Dang Quoc Cuong, Truong Thi Nga and Nguyen Thi Kim Dung, 2015. Amelioration of nitrogen, phosphorus from wastewater of intensive fish ponds by rice fields. Journal of science, Can Tho University. Part A: Science, Technology and Environment: 39 (2015): 66-70. ISSN 1859- 2333. 1 Chapter 1 INTRODUCTION1. The Urgency of DissertationThe Mekong Delta (MD) is a key region for aquaculture and processing exportseafood, bringing many benefits to the economy and society. Catfish farmingarea of the Mekong Delta in 2014 was estimated at more than 5.500 hectareswith production of 1.116 thousand tonnes (Ministry of Agriculture and RuralDevelopment, 2014). In addition, the operations of aquaculture still existshortcomings. Wastewater in aquaculture was discharged directly into theenvironment without external treatment. This problem was not only affects ina farming area but also affects other neighborhoods. The results of previousstudies showed in wastewater intensive catfish ponds containing highnutrients, can be reused. The dissertation Using wastewater from intensivecatfish pond for irrigating paddy field was implemented with the purpose torecycle nutrients in wastewater from catfish ponds for irrigating paddy, reduceinorganic fertilizer and contribute to reduce the water pollution.2. Objectives of the study - Assessing the situation of catfish farming in some areas of theMekong Delta as a basis for proposing measures to manage waste from catfishponds. - The survey and analysis in catfish ponds to assess the compositionand characteristics. - Assessing the pollutants load of waste water from catfish ponds. - Assessing the possibility of wastewater treatment from catfish pondsand benefits of environmental when using wastewater for irrigating paddyfields.3. Subjects and scope of researchWastewater from intensive catfish ponds in Vinh Thanh and Thanh Mydistrict, Can Tho city, soil of paddy fields and rice surrounding householdswere selected as study subjects to assess the potential to reduce pollution fromintensive catfish pond in each stage of development of paddy fields.The survey assessed the current state of catfish, the composition andcharacteristics of wastewater from catfish ponds in the five distriscts are: VinhThanh (Can Tho), Thanh My (Can Tho), Long Ho (Vinh Long), Hong Ngu 2(Dong Thap), Chau Thanh (An Giang) to assessing the quality of wastewatercatfish ponds in the area of intensive research.The experiments using wastewater for irrigating paddy fields was conducted inwinter-spring and summer-autumn from 2013 to 2015 in Vinh Thanh, CanTho on Jasmine rice (105 days) and OM 6976 (90 days) in order todetermining the potential to reduce pollution and increase nutrients of rice.The experimental models using wastewater for irrigation farming ponds onpaddy fields in Hong Ngu (Dong Thap), Chau Thanh (An Giang) and Long Ho(Vinh Long) to assessing research results outside the practice.4. The content of studySurveying the current state of intensive catfish in some provinces of MekongDelta are: An Giang, Vinh Long, Can Tho and the composition, properties ofwastewater from catfish ponds in some key areas are: Dong Thap, An Giang,Vinh Long and Can Tho.Assessing the pollution load of COD, total nitrogen, total phosphorous fr ...