Comparison Study on Sludge Storage Capacity between Japanese Model and the EU Model of Small-Scale Wastewater Treatment System (Johkasou)

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  • 日本仕様とＥＵ仕様の小規模汚水処理プラントにおける汚泥貯留能力の比較
  • ニホン シヨウ ト EU シヨウ ノ ショウキボ オスイ ショリ プラント ニ オケル オデイ チョリュウ ノウリョク ノ ヒカク

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Abstract

 In order to introduce Japanese Johkasou as wastewater treatment system in the EU region it is necessary to collect and organize information for appropriate sludge management. A research was carried out examining the volume of sludge generation and sludge storage capacity for a small-scale wastewater treatment plant installed as a model for the EU region. This study focused on the difference of wastewater flow and pollution loading amount when testing Johkasou system performance in the EU and Japan. The Japanese model of wastewater treatment plant (Johkasou) was redesigned for the EU model whilst the BOD volumetric load was set equal for both models. The results of a field test of the EU model were compared with those of Japanese Model.<br> The results showed that the amount of sludge discharge from the EU model was 1.1 L per capita per day was lower compared to the 1.5 L per capita per day of Japanese model. This was attributed to high catabolism rate of the EU model. Therefore, it was concluded the EU model generated less sludge per BOD inflow load. Furthermore, the ratio of volume of sludge generation to retention time in the primary treatment tank was confirmed and it was revealed that the progress of denitrification caused suppression of sludge generation.

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