6Paul Eisenhardt, G David Waltirp. Improving wastewater treatment plant operations efficiency and effectiveness [ J ]. Water Environ Res Found, 1999,30 (2) : 628 - 634.
7Kaya D, Yagmur E A, Yigit K S, et al. Energy efficiency in pumps [ J ]. Energy Convers Manage, 2008,49 ( 6 ) : 1662 - 1673.