WASTEWATER TREATMENT APPARATUS

• Main Authors: NAGAMORI YASUHIKO, OBARA TAKUMI, TOKIMOTO HIROYUKI, FUJISAWA MINORU, ASHIKAGA NOBUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 15.12.2014
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide a wastewater treatment apparatus in which a dissolved sulfide concentration and a nitrate nitrogen concentration are managed by a simple configuration, and lowering of a nitrogen removal ratio and diffusion of hydrogen sulfide to the ambient air are suppressed.SOLUTION: A wastewater treatment apparatus 100 includes: a wastewater storage tank 1; a water sending device 11; an anaerobic treatment tank 2; an aerobic treatment tank 3; a sulfur denitrification treatment tank 4; a solid-liquid separation tank 5; a circulation system 31; an aerator 32; a flow meter 311; an electrometer 41; and a control part 6. The anaerobic treatment tank 2 generates anaerobic treatment water including a dissolved sulfide. The aerobic treatment tank 3 removes an organic matter in waste water and generates aerobic treatment water including nitrate nitrogen. The sulfur denitrification treatment tank 4 possesses sulfur denitrification bacteria that convert nitrate nitrogen to a nitrogen gas using the dissolved sulfide. The electrometer 41 measures an oxidation reduction potential in a liquid phase of the sulfur denitrification treatment tank 4. The control part 6 controls an output power of the circulation system 31 on the basis of a circulation flow amount so that the oxidation reduction potential may become a prescribed value. 【課題】簡単な構成で溶存硫化物濃度及び硝酸性窒素濃度を管理し、窒素除去率の低下及び硫化水素の大気への放散を抑制する排水処理装置を提供する。【解決手段】排水処理装置１００は、排水貯留槽１と送水装置１１と嫌気性処理槽２と好気性処理槽３と硫黄脱窒処理槽４と固液分離槽５と循環装置３１と曝気装置３２と流量計３１１と電位計４１と制御部６とを備える。嫌気性処理槽２は、溶存硫化物を含む嫌気処理水を生成する。好気性処理槽３は、排水中の有機物を除去し硝酸性窒素を含む好気処理水を生成する。硫黄脱窒処理槽４は、溶存硫化物を利用して硝酸性窒素を窒素ガスへ変換する硫黄脱窒細菌を保有する。電位計４１は、硫黄脱窒処理槽４の液相中の酸化還元電位を計測する。制御部６は、酸化還元電位が所定の値になるように循環流量を基に循環装置３１の出力を制御する。【選択図】 図１