1. Full name: Nguyen Thi Hang Nga                             2. Sex: Female

3. Date of birth: 2ndApril 1984                                       4. Place of birth: Hung Yen province

5. Admission decision number: Decision no. 3201/QĐ-SĐH dated on 8th November 2010, signed by the President of Vietnam National University

6. Changes in academic process: None

7. Official thesis title: Using microorganism to treat the solid wastes from cassava starch processing into bio-organic fertilizer

8. Major: Soil and Water Environment                 9. Code: 62440303

10. Supervisors: Assoc Prof. Dr. Nguyen Lan Huong and Assoc Prof. Dr. Tran Khac Hiep

11. Summary of the new findings of the thesis:

- To isolate, select and exploit the biological characteristics of three microorganisms including: one cellulose-degrading strain of Streptomyces griseorubens SHX.02, one phosphate solubilizing strain of Bacillus polyfermenticus SHB.18 and one nitrogen-fixing strain of Azotobacter beijerinckii SHV.07 to successfully produce multifunctional microbial product to treat of solid waste from cassava starch processing.

- To successfully apply microorganism preparation for rapid treating solid waste from cassava starch processing in Ninh Binh and Dak Lak province into bio-organic fertilizer to ensure quality according to Circular no.41/2014/TT-BNNPTNT. This fertilizer can replace manure, reduce 25% of NP fertilizer without affecting crop yield and initially improving the soil properties planting cassava in Krong Bong district - Dak Lak province.

12. Paratical applicability, if any:

The reuse of solid wastes as bio-organic fertilizers not only takes advantage of the discarded resources, but also helps cassava starch factories overcome environmental pollution, cleaner production in cassava starch production helps cement the plant with cassava farmers to ensure production inputs and sustainable development of organic agriculture.

13. Further research directions, if any:

- Continue use of microbial preparation in treatment of solid wastes from cassava starch processing at large scale in cassava starch factories throughout the country.

- Evaluate the effect of bio- organic fertilizers from cassava starch processing wastes on other crop species and soils types.

14. Thesis-related publications:

[1] Luong Huu Thanh, Vu Thuy Nga, Nguyen Thi Hang Nga, Dao Van Thong, Le Thi Thnah Thuy, Cao Huong Giang, Ha Thi Thuy, Luu Thi Hong Tham, “Selection of microorganisms handle cassava starch processing waste solid into organic fertilizer biological”, Journal of Vietnamese Agricultural Science and Technology, no. 1 (22)/2011, p.109-112

[2] Luong Huu Thanh, Vu Thuy Nga, Dao Van Thong, Hua Thi Son, Tong Hai Van, Cao Huong Giang, Pham Thi Thanh Huyen, Nguyen Ngoc Quynh, Ha Thi Thuy, Nguyen Thi Hang Nga, “Reseach on the microbial production of waste’s cassava starch processing treatment”, Science and Technology Journal of Agriculture and Rural Development, no. 3/2013, p.133-139.

[3] Nguyen Thi Hang Nga, Nguyen Lan Huong, Tran Khac Hiep, Nguyen Kieu Bang Tam (2015),” Application of actinomyces strains in treatment of solid waste after cassava starch processing to make bio-fertilizer”, Vietnam Journal of Soil Science, no.46/2015, p.84-88.

[4] Nguyen Thi Hang Nga, Nguyen Lan Huong, Tran Khac Hiep, Nguyen Kieu Bang Tam, Luong Huu Thanh (2016), “Study on production of microbial product to handle solid waste after cassava starch processing to make organic bio-fertilizer”, VNU Journal of Science: Earth and Environmental Sciences, no.32 /2016, p.282-288.