Removal Efficiency for Pesticides on Coagulation and Sedimentation using Coagulant Recovered from Water Supply Sludge

Ishikawa, Seiichi; Ueda, Naoko; Okumura, Yuji; Iida, Yoshikazu; Higuchi, Masayuki; Naetoko, Eri; Tokunaga, Yasunori; Baba, Kenzo

doi:10.2965/jswe.29.653

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Then, the residual pesticide in many kinds of food have already been regulated and the aiming standard values of 101 types of pesticide for tap water quality control were set up in 2003 (Ando, 2004). However, only 21 in 117 types of pesticide showed over 80% of removal ratio in the coagulation and sedimentation usually performed at a water purification plant (Ishikawa et al, 2006). Then, we investigated on the photodecomposition behaviors of the 5 types of pesticide which were largely used in Kitakyushu district.…”

Section: Introductionmentioning

confidence: 99%

Photodecomposition Behaviors of Pesticides in the Source for Water Supply Using an Alumina Carrier-Titanium Dioxide Photocatalyst

Ishikawa¹,

Cho²,

Li³

et al. 2012

Food Industrial Processes - Methods and Equipment

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Section: Introductionmentioning

confidence: 99%

Photodecomposition Behaviors of Pesticides in the Source for Water Supply Using an Alumina Carrier-Titanium Dioxide Photocatalyst

Ishikawa¹,

Cho²,

Li³

et al. 2012

Food Industrial Processes - Methods and Equipment

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Alum Recovery from Water Clarifier Sludge as Coagulant and Phosphorus Removal by Recovered Alum

Ichihara¹,

Nishio²

2011

Mizu Kankyo Gakkaishi

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To recycle water clarifier sludge as a coagulant, we extracted alum from the sludge (hereafter called recovered alum (RA)) and attempted to obtain a high Al concentration and improve RA quality. RA was obtained by acidifying the sludge with concentrated sulfuric acid to adjust its pH below 2, and then centrifuging the mixture and decantating the supernatant. RA contained Al at 0.75-9.4% as Al 2 O 3 . To obtain a high Al concentration, it was better to use the sludge with a low water content. As impurity concentration increased with Al concentration, we purified RA by coagulating it with the addition of sodium hydroxide and resolubilizing it with the addition of dilute sulfuric acid. We were able to remove T-N, Fe, and Mn in the crude RA at 43.6%, 45.4% and 76.5% respectively by purification. When we used RA to model effluent containing 0.85 mg P • L -1 and underground water samples containing 1.14-1.52 mg P • L -1 , the phosphorus removal efficiency of RA was essentially comparable with that of commercial alum. RA removed over 90% phosphorus when the PO 4 3-:Al molar ratio was 1:5. As a conclusion, RA is a useful coagulant as long as we pay attention to the dose of contaminants.

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Removal Efficiency for Pesticides on Coagulation and Sedimentation using Coagulant Recovered from Water Supply Sludge

Cited by 2 publications

References 6 publications

Photodecomposition Behaviors of Pesticides in the Source for Water Supply Using an Alumina Carrier-Titanium Dioxide Photocatalyst

Photodecomposition Behaviors of Pesticides in the Source for Water Supply Using an Alumina Carrier-Titanium Dioxide Photocatalyst

Alum Recovery from Water Clarifier Sludge as Coagulant and Phosphorus Removal by Recovered Alum

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