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| Optimization of microalgae-bacteria symbiosis system for the advanced treatment of livestock wastewater using response surface methodology |
| Received:November 23, 2019 |
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| KeyWord:advanced wastewater treatment;livestock wastewater;microalgae-bacteria symbiosis;nutrient salts recovery;response surface methodology |
| Author Name | Affiliation | E-mail | | ZENG Hui-qing | School of Resource Environment and Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang 330038, China | | | LIU Qiang | School of Resource Environment and Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang 330038, China | | | XIAO Cong-liang | School of Resource Environment and Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang 330038, China | | | GUO Yuan-tao | School of Resource Environment and Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang 330038, China | | | SUN Sheng-jin | School of Resource Environment and Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang 330038, China | | | XIN Jia-qi | School of Resource Environment and Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang 330038, China | | | LI Kun | School of Resource Environment and Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang 330038, China | kunli@ncu.edu.cn |
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| Abstract: |
| In order to achieve the optimized parameters for nutrient removal from livestock wastewater using the microalgae-bacteria symbiosis system, the Box-Behnken central combination design(BBC)of response surface methodology(RSM)was used. The selected experimental variables were inoculation proportion(IP), aeration rate(AR), and initial ammonium nitrogen(NH4+-N)concentration and the response value was pollutant removal efficiency(RE). The results of RSM showed that the optimal conditions for chemical oxygen demand (COD)removal were:activated sludge to microalgae IP at 6.0(m/m), AR at 2.0 L·min-1 and initial NH4+-N concentration of 750 mg·L-1 with the highest COD RE over 92%. For total nitrogen(TN)removal, the best RE of 53% was achieved when IP was 5.0 (m/m), AR was 1.5 L·min-1, and initial NH4+-N concentration was 750 mg·L-1. For phosphate removal, the RE reached 100% in 96 h with the IP at 6.0, the AR at 1.5 L·min-1, and the initial NH4+-N concentration of 600 mg·L-1. Further testing on biomass production showed that the highest yield of microalgae(1.63~1.64 g·L-1)was achieved with AR at 1.5 L·min-1, initial NH4+-N concentration of 900 mg·L-1, and IP at 4.0(m/m)or AR at 1.0 L·min-1, initial NH4+-N concentration of 750 mg·L-1, and IP at 4.0 (m/m). The results showed that RSM could be utilized for the optimization of livestock wastewater treatment by the microalgae-bacteria symbiosis system. There were different optimal parameter combinations for different targeted pollutants. Considering all parameters that influence the pollutant REs, the optimized parameter combination can be selected. The microalgae-bacteria consortia harvested from the wastewater treatment process can be further utilized as biomass resources, which will bring good economic value and further raise the application prospects of the process. |
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