WASTE WATER TREATMENT APPARATUS, AND WASTE WATER TREATMENT METHOD

• Main Authors: OBARA TAKUMI, TOKIMOTO HIROYUKI, FUJISAWA MINORU, ASHIKAGA NOBUYUKI, HU JINYANG
• Format: Patent
• Language: English; Japanese
• Published: 29.06.2017
• Subjects: CHEMISTRY; METALLURGY; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide a waste water treatment apparatus and a waste water treatment method capable of enhancing a nitrogen removal rate.SOLUTION: A waste water treatment apparatus is equipped with an anaerobic treatment tank, a sulfur denitrification tank to introduce the primary treated water treated in the anaerobic treatment tank from its bottom for treatment, and an aerobic treatment tank to treat the secondary treated water treated in the sulfur denitrification tank. The primary treated water and the tertiary treated water that is treated in the aerobic treatment tank and introduced from the bottom of the sulfur denitrification tank pass through a sludge bed containing heterotrophic denitrifying bacteria installed at the bottom thereof. Carriers containing sulfur denitrifying bacteria are installed above the sludge bed separated from each other. A biogas containing hydrogen sulfide generated in the anaerobic treatment tank is supplied to the carriers via a gas supply device arranged below the carriers.SELECTED DRAWING: Figure 1 【課題】窒素除去率を高めることができる廃水処理装置、および廃水処理方法を提供することを課題とする。【解決手段】実施形態に係る廃水処理装置は、嫌気性処理槽と、この嫌気性処理槽で処理された一次処理水を底部から導入して処理する硫黄脱窒槽と、この硫黄脱窒槽で処理された二次処理水を処理する好気性処理槽と、を有する。硫黄脱窒槽は、その底部に設けられた従属栄養脱窒菌を含む汚泥床に、一次処理水を通過させるとともに好気性処理槽で処理されて硫黄脱窒槽の底部から導入される三次処理水を通過させ、この汚泥床の上方に離間して配置された硫黄脱窒菌を保持した担体の下方に配置されたガス供給装置を介して、嫌気性処理槽で発生した硫化水素を含むバイオガスを担体に供給する。【選択図】 図１