PURIFICATION TREATMENT OF WASTEWATER AND EQUIPMENT THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a treatment process which enables the use of an anaerobic biological treatment device as the sole biological treatment device through elimination of any conventional nitrogen/phosphorus removal device and also simplification of the equipment structure and further effective utilization of nutrient salts in wastewater for the anaerobic biological treatment. SOLUTION: This treatment process comprises: removing solid matter from wastewater in a solid-liquid separator 14; then, distilling the solid matter-free wastewater with a distiller 18 to separate the wastewater into distilled and condensed water containing low-boiling point organic matter and a distillation residue containing nutrient salts; and treating the distilled and condensed water with microorganisms in an anaerobic biological treatment device 36; wherein in the anaerobic biological treatment, the solid matter-free wastewater is added to the distilled and condensed water in an amount sufficient to perform microorganism cell synthesis.