JP2014042883A - 生物膜処理装置の運転方法 - Google Patents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
【解決手段】粒状の微生物担体を槽内で流動させる流動床式生物処理装置の運転方法であって、初期充填時の微生物担体よりも小さい平均粒径(調和平均径)の微生物担体を補充する。
【選択図】なし
Description
流動床式生物膜処理槽内では、微生物担体が常に流動していることが必要である。微生物担体は、粒径が小さいほど軽量であるため、流動床上部には小粒径の微生物担体が多く存在し、流動床下部には大粒径の微生物担体が多く存在する。一方、処理原水濃度は流動床下部ほど高く、流動床上部ほど低い。大粒径の微生物担体は、衝突しやすいため、付着した微生物の剥離が生じやすいが、小粒径の微生物担体は衝突しにくいため付着した微生物が剥離しにくい。したがって、小粒径の微生物担体に付着した微生物量が流動床上部ほど多くなり、流動床下部ほど少なくなる。微生物担体の沈降速度が低下すると、微生物担体は流動床上部にとどまるため、処理水と一緒に生物処理槽外に流出しやすい。流出した微生物担体に相当する量の微生物担体を補充することで、微生物担体量を維持する。補充する微生物担体の粒径を微生物が付着して剥離しにくい小粒径とすることで、生物処理槽内の微生物量を維持する。小粒径の微生物担体を補充するためには、補充する微生物担体の平均粒径を、運転開始時に充填した微生物担体の平均粒径よりも小さくすることが必要である。
生活雑排水(平均水質:BOD 200mg/L、SS 200mg/L、NH4-N 30mg/L)を原水として、ケイ砂(平均粒径:0.25mm、粒径分布範囲:0.15〜0.38mm)を微生物担体として生物処理槽の有効容積に対して10v/v%を初期投入した生物膜処理装置(図1の(3)に示す気体撹拌流動式生物処理装置)を用いて、処理水量1m3/日、BOD容積負荷:2.0kg-BOD/m3/日の条件で、本発明の運転方法と、従来の運転方法とを実施し、処理性能を比較した。
Claims (3)
- 粒状の微生物担体を槽内で流動させる流動床式生物処理装置の運転方法であって、初期充填時の微生物担体よりも小さい平均粒径の微生物担体を補充することを特徴とする生物処理装置の運転方法。
- 初期投入時の微生物担体の平均粒径(調和平均径)の90%未満の平均粒径(調和平均径)を有し且つ粒度分布範囲の最大粒径が初期投入時の80%未満である粒度分布範囲を有する微生物担体を流動床式生物膜処理槽に補充する、請求項1に記載の運転方法。
- 初期充填時の微生物担体は、平均粒径0.25mm、粒度分布範囲0.15〜0.38mmで0.20〜0.30mm範囲に50%以上が分布している粒子群であり、
補充する微生物担体は、平均粒径0.22mm、粒度分布範囲0.15〜0.30mmで0.18〜0.28mm範囲に50%以上が分布している粒子群である、請求項1又は2に記載の運転方法。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5830392A (ja) * | 1981-07-09 | 1983-02-22 | Ebara Infilco Co Ltd | 汚水の処理方法 |
JPS6342796A (ja) * | 1986-08-06 | 1988-02-23 | Nippon Steel Corp | 高炉水滓を活性汚泥の固定化担体に用いた下水の連続活性汚泥処理方法 |
JPS63158195A (ja) * | 1986-12-22 | 1988-07-01 | Nkk Corp | 汚水処理方法 |
JPH0716584A (ja) * | 1993-06-23 | 1995-01-20 | Degremont Sa | 水の生物学的処理方法 |
JPH09248572A (ja) * | 1996-03-12 | 1997-09-22 | Nkk Corp | 膜濾過装置及び膜濾過方法 |
JPH10258295A (ja) * | 1997-03-18 | 1998-09-29 | Kitakiyuushiyuushi | 公共水道設備 |
-
2012
- 2012-08-27 JP JP2012186996A patent/JP5963613B2/ja active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5830392A (ja) * | 1981-07-09 | 1983-02-22 | Ebara Infilco Co Ltd | 汚水の処理方法 |
JPS6342796A (ja) * | 1986-08-06 | 1988-02-23 | Nippon Steel Corp | 高炉水滓を活性汚泥の固定化担体に用いた下水の連続活性汚泥処理方法 |
JPS63158195A (ja) * | 1986-12-22 | 1988-07-01 | Nkk Corp | 汚水処理方法 |
JPH0716584A (ja) * | 1993-06-23 | 1995-01-20 | Degremont Sa | 水の生物学的処理方法 |
JPH09248572A (ja) * | 1996-03-12 | 1997-09-22 | Nkk Corp | 膜濾過装置及び膜濾過方法 |
JPH10258295A (ja) * | 1997-03-18 | 1998-09-29 | Kitakiyuushiyuushi | 公共水道設備 |
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