CWQI index as quality indicator of surface water - An approach on the Olt River, Romania

Abstract

This work aims at assessing the pollution degree of the Olt River (Romania), based on the Canadian Water Quality (CWQI) index, by monitoring twenty twos locations along the middle and south part of the river basin for a period of four months, from March to October, during 2018. A comprehensive physico-chemical analysis involving major cations (Ca2+, Mg2+, Na+), anions (Cl-, SO42-, N-NO3--) and general parameters (pH, electrical conductivity, total dissolve solids) was performed for this purpose. Results demonstrated that CWQI values classified the water in the investigated sectors of the river as fair (values ​​between 66.08 to 79.05), marginal (56.22 to 64.63) and good (value of 85.60). This method appears to be more systematic and provide comparative evaluation of the water quality in different seasons of the year. The results showed that there is a large variations in the parameters in different sections of the river due to different anthropogenic factors. Therefore, this index may be helpful as marker for the public to better understand the quality of water, but also as tool for water quality management.

Sustainable Tourism Development and Ramsar Sites in Serbia: Exploring Residents’ Attitudes and Water Quality Assessment in the Vlasina Protected Area

“…Some studies about the Danube River quality involved artificial Ðerdap Lake [43,[46][47][48][49]. The Canadian Water Quality Index (CWQI) is applied in various studies of lakes and artificial lakes (reservoirs): the Polyphytos artificial lake in Greece [50], Wadi El-Rayan lakes in Egypt [51], Qu' Appelle Valley lakes in Canada [52], Lake Kinneret in Israel [4], reservoirs and lakes in the Ebinur Lake Watershed in China [53], accumulation lakes on the Olt River and Danube River in Romania [54], Djerdap Lake on Danube River in Serbia [46,49], and the Palić and Ludaš Lakes in Serbia [55,56]. The Water Pollution Index (WPI) is applied for water quality assessment in Fuxian Lake in the protected area in southwest China [57]; in Poyang Lake, the largest freshwater lake in China [58]; Ulansuhai Lake, the largest shallow lake of the Yellow River in China [59]; Qiandao Lake in China [60]; Soyang reservoir in South Korea [61]; Chungju Reservoir in South Korea [62]; the lakes Burabai and Ulken Shabakty in Kazakhstan [63]; Nasser Lake in Egypt [64]; the lake in the near od Dramaha Campus of IPB in Indonesia [65]; Lower Vaengskoye Lake in the Murmansk Region in Russia [66]; and Djerdap Lake on the Danube River in Serbia [49,67,68].…”

Development of a groundwater quality index: GWQI, for the aquifers of the state of Bahia, Brazil using multivariable analyses

“…The multiplicative formula to produce a single WQI-NSF value, operates the dimensionless subindex raised to a power, or the weight of importance of each variable. More recently, in 2001, emerged the WQI-CCME 23 , 24 , a statistical index to assess the quality of surface waters, very well-known and applied worldwide as it was proposed 3 , 4 , 13 , 14 , 25 – 35 ; also applied after receiving some adaptation for local conditions 36 , 37 . The index 23 was proposed with the support of the Canadian Council Minister of Environment, with the following characteristics: it is independent of dimensionless sub-indices; can incorporate from four to all measured parameters; all parameters had the same degree of importance, and had to be measured during four monitoring campaigns.…”

Aplicação de lodo de esgoto no solo

“…Fonte:SANDRU et al 2018 Portanto, tendo em vista o potencial risco envolvido na presença de metais no solo, e os riscos da aplicação de lodo de esgoto em solos agrícolas, a Resolução CONAMA 375/06 estabelece limites máximos de metais no lodo, como mostra o Quadro 2.Quadro 2 -…”