ORGANIC WASTEWATER TREATMENT METHOD AND APPARATUS

摘要

This invention provides anaerobic biological treatment method and apparatus that can stably treat hardly degradable component-containing organic wastewater in a high-performance manner for a long period of time. The anaerobic biological treatment method for organic wastewater comprises providing an upflow anaerobic reactor (2) packed with activated carbon, withdrawing a part of treatment water (9) from the top of the reactor (2), and circulating the withdrawn water to the reactor (2) in its bottom or raw water inflow part. In this method, the amount of the liquid circulated from the top of the reactor (2) to the bottom or raw water inflow part is regulated according to the treatment status of the reactor (2). For example, the concentration of inhibitory organic matter of the treatment water and/or the amount of methane gas in relationship with inflow COD_cr in the reactor may be mentioned as the treatment status of the reactor (2). Seed sludge may be added to the reactor (2) simultaneously with or after packing of the activated carbon. A multistage gas-liquid-solid separation part (3) for separating the produced methane gas, the treatment water and the packing material provided in a vertical direction may be provided in the reactor (2), and, in addition, means for measuring the amount of the separated methane gas may be provided.