4 research outputs found
SEASONAL EVOLUTION AND DEPTH VARIABILITY OF HEAVY METAL CONCENTRATIONS IN THE WATER OF FIRIZA-STRÎMTORI LAKE, NW OF ROMANIA
No full textThe paper follows the spatial variability and seasonal evolution of the heavy metal content of the Firiza-Strîmtori Reservoir that is the main source of drinking water for Baia Mare city located in the northwestern part of Romania. Water samples were collected from 10 sampling points located along the median line of the lake at different depths (at surface, at 5 m, 10 m, 15 m and 20 m). The experiments were carried out in the winter, spring, summer and autumn of 2015. We determined the concentration – depth profiles, both for the heavy metals iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), cadmium (Cd), lead (Pb) and also for sodium (Na), potassium (K), calcium (Ca) and magnesium (Mg). We determined the concentrations of heavy metals by atomic absorption spectrometry. We found that concentrations of heavy metals increase with depth. Generally, the concentrations of heavy metals are within the legal limits for the water used as drinking water sources. Mathematical models with high correlation coefficients were obtained in the case of heavy metal concentrations depending on depth and also for the seasonality of heavy metals upload
CONSIDERATIONS ON THE RELATIVE EFFICACY OF ALUMINUM SULPHATE VERSUS POLYALUMINUM CHLORIDE FOR IMPROVING DRINKING WATER QUALITY
No full textThis study presents the evolution of specific parameters of raw water quality from the Strâmtori-Firiza Lake, which is the raw water source of the water plant in Baia Mare town, Romania. Parameters such as temperature, turbidity, oxidability were recorded over a four years’ period. A comprehensive database on the evolution of these water parameters was thus created showing the tendency of these parameters across time. The possible correlations among the parameters were investigated. Positive correlations were found for oxidability and Al content and also for turbidity and oxidability. Temperature and turbidity were found to be highly variable (2-17°C, 3-53 NTU) across seasons. In order to improve the turbidity of treated water, two coagulants were tested: basic polyaluminum chloride (PAC) and aluminum sulphate (SA) evaluating the efficiency of the two treatment methods. While the traditionally used aluminum sulphate was found to be effective only when the temperature and turbidity were high: temperature >10ºC, turbidity >10 NTU (nephelometric turbidity unit), PAC emerged as an efficient clarifying agent even at low temperature and turbidity
Seasonal Evolution and Depth Variability of Heavy Metal Concentrations in the Water of Firiza-Strîmtori Lake, NW of Romania
No full textCONSIDERATIONS ON THE RELATIVE EFFICACY OF ALUMINUM SULPHATE VERSUS POLYALUMINUM CHLORIDE FOR IMPROVING DRINKING WATER QUALITY
No full textThis study presents the evolution of specific parameters of raw water quality from the Strâmtori-Firiza Lake, which is the raw water source of the water plant in Baia Mare town, Romania. Parameters such as temperature, turbidity, oxidability were recorded over a four years’ period. A comprehensive database on the evolution of these water parameters was thus created showing the tendency of these parameters across time. The possible correlations among the parameters were investigated. Positive correlations were found for oxidability and Al content and also for turbidity and oxidability. Temperature and turbidity were found to be highly variable (2-17°C, 3-53 NTU) across seasons. In order to improve the turbidity of treated water, two coagulants were tested: basic polyaluminum chloride (PAC) and aluminum sulphate (SA) evaluating the efficiency of the two treatment methods. While the traditionally used aluminum sulphate was found to be effective only when the temperature and turbidity were high: temperature >10ºC, turbidity >10 NTU (nephelometric turbidity unit), PAC emerged as an efficient clarifying agent even at low temperature and turbidity
