1 Laboratory of Environment-Enhancing Energy (E2E), and Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture, College of Water Resources and Civil Engineering, China Agricultural University, Beijing, 100083 China.
2 Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, 61801 USA.
3 Key Laboratory of Industrial Biocatalysis of Ministry of Education of China, Beijing, 100084 China.
4 Department of Chemical Engineering, Institute of Biochemical Engineering, Tsinghua University, Beijing, 100084 China.