Abstract Dimethyl aminoethyl azide (DMAZ) is a liquid fuel in the space industry. Although this non-carcinogenic, its wastewater suffers from some hazardous pollutants, such as sodium (NaN3). A hybrid process of coagulation–flocculation and chemical reaction with nitrous acid was applied for treatment. The Taguchi method used optimization. Coagulant concentration, rapid mixing intensity, durati...

This study is aimed at assessing the physico-chemical parameters of water from Iwofe River which heavily stressed by extensive anthropogenic activities like bunkering. Two stations were established and surface samples collected bi-monthly each station for one year. All determined in-situ except biochemical oxygen demand (BOD) was analyzed in laboratory on fifth day sample collection. The result...

The present study evaluated the impact of hydrological variability on hydrodynamics an urban lake in Brazil, considering water quality dynamics and its effects evaporation. Storm Water Management Model (SWMM) was applied to basin, two-dimensional model CE-QUAL-W2 used simulate two models were coupled carry out integrated basin-lake modeling. Then, applied: a transient complete mixing empirical ...

Irrelevant inputs can cause deterioration of the network performance. This paper aims to implement features selection for water quality prediction model as the neural network generalization may be improved when the number of measured variables is reduced. Canonical Correspondence Analysis (CCA) was introduced as a feature selection method, where it choose a subset of input variables by eliminat...

The aim of this research was to assess the treatment efficiencies for gully pot liquor of experimental vertical-flow constructed wetland filters containing Phragmites australis (Cav.) Trin. ex Steud. (common reed) and filter media of different adsorption capacities. Six out of 12 filters received inflow water spiked with metals. For 2 years, hydrated nickel and copper nitrate were added to siev...

With urbanization of coastal cities, marine pollution is becoming a severe problem. The rates of biodegradation, decomposition, and ratification of pollutants get slowed down due to salinity. The higher temperatures prevalent in tropical regions significantly affect reaction rates. Multiple factors influence the rate of biodegradation, making the process complex. Hence, prediction and evaluatio...

in this study artificial neural network (ann) was used for modeling of wastewater treatment plants with using. for this purpose, the base of the quality parameters measured at the plant input, plant output value was predicted. neural network input data, including temperature (t), biochemical oxygen demand (bod), chemical oxygen demand (cod), total suspended solids (tss), total solids (ts) and p...

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...