報告書番号

U96032

タイトル（和文）

排水中の窒素除去に関する研究３．封筒型浄化モジュールの提案とその性能評価

タイトル（英文）

DEVELOPMENT OF BIOLOGICAL WASTEWATER TREATMENT SYSTEM FOR NITROGEN REMOVAL 3.SINGLE-PASS REACTOR USING SACK GEL MODULE

概要 （図表や脚注は「報告書全文」に掲載しております）

アンモニア酸化菌と脱窒菌を包埋した０．５ｍｍ厚の膜状ゲル２枚を張り合わせて作製した封筒型モジュールにより，模擬排水のバッチ処理と連続処理を行った。封筒型モジュールは，硝化と脱窒を同時に行えるチューブ状ゲルの特徴と，同等のゲル表面積当たりの活性を持っていた。また，８個のモジュールを充■したリアクターは，１時間に０．２ｍｌの１０％（ｖ／ｖ）エタノールを各モジュールに添加する条件下において，最も効率よくアンモニア除去を行うことができ，模擬排水の滞留時間２．４時間の条件下では，リアクター容量１立方ｍ当たり１．７ｋｇ－Ｎ／ｄａｙのアンモニア除去速度を，滞留時間を３．３時間の条件下では，１．４ｋｇ－Ｎ／ｄａｙのアンモニア除去速度を示した。

概要 （英文）

A NEW BIOREACTOR USING A SACK GEL MODULE WASDESIGNED.IT IS MADE OF TWO PLATE GELS CONTAINING NITROSOMONAS EUROPAEAAND PARACOCCUS DENITRIFICANS.WHEN THE EXTERNAL SIDE OF THE MODULE IS IN CANTACT WITH WASTEWATER CONTAINING AMMONIA,N.EUROPAEA IN THE GEL OXIDIZES THE AMMONIA TO NITRITE AEROBICALLY.ON THE OTHER HAND,WHEN ETHANOL IS SUPPLIED FROM THE INTERNAL SIDE OF THE MODULE AS AN ELECTRON DONOR FOR DENITRIFICATION,P.DENITRIFICANS IN THE GEL REDUCES THE NITRITE TO NITROGEN GAS USING THE ETHANOL ANAEROBICALLY.THEREFORE,AMMONIA IN THE WASTEWATER IS REMOVED EFFECTIVELY WITHOUT ACCUMULATING NITRITE,NITRATE,ANDNITROUS OXIDE. ARTIFICIAL WASTEWATER CONTAINING 200 MG-N/L OF AMMONIA WAS TREATED BY THE MODULE.AMMONIA WAS REMOVED WITHOUT ACCUMULATING NITRITE AND NITRATE.THE AMMONIA REMOVAL RATE OF THE MODULE WAS 5.6G-N/DAY FOR 1 SQUARE M OF GEL SURFACE,WHICH IS SIMILAR TO THAT OF THE TUBULAR GEL SYSTEM.THE ARTIFICIAL WASTEWATER WAS ALSO TREATED BY A SINGLE-PASS REACTOR CONTAINING EIGHT MODULES.WHEN 0.2 ML OF 10% (V/V)ETHANOL SOLUTIONWAS SUPPLIED TO THE MODULE EVERY HOUR,AMMONIA WAS REMOVED WITHOUT ACCUMULATING NITRITE,NITRATE,AND ETHANOL.WHEN THE RETENTION TIME OF THE REACTOR WAS 2.4 HOURS,80% OF THE AMMONIA IN THE WASTEWATER WAS REMOVED;THEAMMONIA REMOVAL RATE OF THE REACTOR WAS 1.7 KG-N/DAY FOR 1 QUBE M OF REACTOR VOLUME.WHEN THE RETENTION TIME WAS 3.3 HOURS,95% OF AMMONIA WAS REMOVED AND THE RATE WAS 1.4 KG-N/DAY.THE EFFICIENCY OF THE REACTOR IS TWICE AS HIGH AS CURRENTLY-AVAILABLE SYSTEMS.

報告者

キーワード