Loading...
Please wait, while we are loading the content...
Similar Documents
Influence of Aeration Cycle and Sludge Load on Nitrogen Removal and Permeate Flux in a Single-Reactor Membrane-Separation System
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tomohira, Hisao Yamaguchi, Tsukasa Komatsu, Toshiya |
| Copyright Year | 2002 |
| Abstract | Activated sludge process with submerged membrane separation is a high-efficient and energy-saving wastewater treatment process. Interest has been now growing particularly in a single-reactor membrane-separation system, because the system component is simple and nitrogen, which is a cause substance of the eutrophication problem, can be efficiently removed by operating the reactor with intermittent aeration. However, operational factors influencing on nitrogen removal and the permeate flux in this system have not been clarified yet. This study was conducted to investigate the effects of aeration cycle and sludge load on these performances by continuous operation of the reactors. First, the influence of aeration cycle was investigated. Reactors were operated under four different conditions of aeration cycle. As the results, a cycle of 30 minutes aeration and 30 minutes non-aeration was most effective in both nitrogen removal and the maintenance of permeate flux. Next, the influence of sludge load was investigated. Operation with sludge drawing was compared with the operation without sludge drawing under high volumetric load conditions. It was revealed that the operation without sludge drawing, in which sludge load was decreasing with time, had the advantage in both of the performances. KEYWORDS; membrane-separation, aeration cycle, sludge load, nitrogen removal, permeate flux 1.は じめに 湖沼 ・港湾等の閉鎖性水域における富栄養化問題が依然 として深刻な問題 となっている。そのため,閉 鎖性水域に放流する下水処理場等においては,富 栄養化原因物質である窒素 ・リンといった栄養塩類濃度 の規制がなされている。栄養塩類の除去法としては,嫌 気 ・無酸素 ・好気法(A20法)や,循 環式硝化脱 窒法等が技術的に確立されたものとなっているが,こ れらの処理法では処理面積が広大となることや,維 持管理の煩雑化といった問題がある。また,活 性汚泥法では従来よりバルキング現象による汚泥の沈降性 の悪化 という問題もある。そこで,汚 泥性状に関係なく固液分離が可能であることや,MLSS濃 度の高濃 度保持が可能,硝 化細菌等の有用微生物の系内保持が可能といったメリット1)があることから水処理分野 において膜分離技術の適用が進んでいる2)。 とりわけ,生 物反応 と膜分離を単一の槽で行わせる浸漬型膜 分離活性汚泥法3)が,膜 ろ過に要するエネルギーを大幅に削減できることから現在急速に普及 しつつある。 ★アタカ工業株式会社 (ATAKA Construction & Engineering Co., Ltd.) 鼎 長岡技術科学大学環境 ・建設系 (Dept. of Civil and Env-iron. Eng., Nagaoka Univ. of Tech.) |
| Starting Page | 279 |
| Ending Page | 286 |
| Page Count | 8 |
| File Format | PDF HTM / HTML |
| DOI | 10.11532/proes1992.39.279 |
| Volume Number | 39 |
| Alternate Webpage(s) | https://www.jstage.jst.go.jp/article/proes1992/39/0/39_0_279/_pdf/-char/en |
| Alternate Webpage(s) | https://doi.org/10.11532/proes1992.39.279 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
