TY - BOOK AU - Zimmo ,Omar TI - Nitrogen transformations and removal mechanisms in algal and duckweed waste stabilisation ponds SN - 9058095762 PY - 2003/// CY - Lisse , The Netherlands PB - A. A. Balkema KW - Sewage KW - Purification KW - Nitrogen removal KW - Sewage lagoons KW - Algae KW - Metabolism KW - Duckweeds ER -