In this paper we capitalize on our access to plant level data in examining the relative changes in emissions of three major pollutants | Biochemical Oxygen Demand (BOD), Total Suspended Solids (TSS), and Greenhouse Gas (GHG) | for Canadian pulp and paper mills covering the period from 2005 to 2013. Over this eight-year period emissions of these three pollutants decreased by 31.0%, 35.5% and 42....

Predicting the adsorption performance to remove organic pollutants from wastewater is an essential environmental-related topic, requiring knowledge of various statistical tools and artificial intelligence techniques. Hence, this study first develop a quadratic regression model neural network (ANN) for predicting biochemical oxygen demand (BOD) removal under different conditions. Nanozero-valent...

養豚汚水処理においては，窒素化合物除去の重要性が増している。窒素除去を円滑に進めるには，生物化学的酸素要求量（BOD）の負荷量原単位の適正化が必要である。そこで，9農場の汚水についてBOD，全窒素（N）およびカリウムイオン（K+）の濃度を調査した。この結果，BOD/N比とBOD/K+比の間には決定係数0.85～0.88の良好な相関関係がみられた。窒素除去に適するとされているBOD/N比3～4の時のBOD/K+比を相関の回帰式により求めると，凝集分離前の汚水で6.39～8.56，高分子凝集剤による凝集分離後の汚水で5.08～6.65となった。これらの比に，尿中カリウム排せつ量原単位として報告されている9.2 g/頭/日を乗ずることで，窒素除去に適するBOD負荷量原単位を分離前汚水で58.8～78.8 g/頭/日，分離後汚水で46.7～61.2 g/頭/日と推定した。

In this study, factor analysis (FA) was applied to extract the hidden factors responsible for water quality variations during both wet and dry seasons. Water samples were collected from six sampling stations (St. 1 Lalang River, St. 2 Semeling River, St. 3 Jagung River, St. 4 Teluk Wang River, St. 5 Gelam River and St. 6 Derhaka River) in the Merbok estuary, Malaysia from January to December 20...

Water quality data at 12 sites within an urban, a suburban, and a rural stream were collected contemporaneously during four wet and eight dry periods. The urban stream yielded the highest biochemical oxygen demand (BOD), orthophosphate, total suspended sediment (TSS), and surfactant concentrations, while the most rural stream yielded the highest total organic carbon concentrations. Percent wate...

In this paper, the measurement of biochemical oxygen demand (BOD) in a wastewater treatment process is analyzed and an intelligent integrated prediction method based on case-based reasoning (CBR) is proposed in order to overcome difficulties. Due to the fact that there are many factors that influence the accuracy of the prediction model, the radial basis function, which is a neural network with...

The physicochemical qualities of a typical rural-based river were assessed over a 12-month period from August 2010 to July 2011 spanning the spring, summer, autumn and winter seasons. Water samples were collected from six sampling sites along Tyume River and analysed for total nitrogen, orthophosphate, biochemical oxygen demand (BOD), temperature, pH, dissolved oxygen (DO), electrical conductiv...

The aim was to assess the treatment efficiencies of experimental storm water detention (extended storage) systems based on the Atlantis Water Management Limited detention cells receiving concentrated runoff that has been primarily treated by filtration with different inert aggregates. Randomly collected gully pot liquor was used in stead of road runoff. To test for a 'worst case scenario', the ...

In order to investigate the temporal and spatial variations of 14 physical and chemical surface water parameters in the Nhue and Day sub-river systems of Vietnam, surface water samples were taken from 43 sampling sites during the dry and rainy seasons in 2007. The results were statistically examined by Mann-Whitney U-test and hierarchical cluster analysis. The results show that water quality of...