The effect of lake restoration by the hypolimnetic withdrawal method on the intensity of ambient odour

Abstract

The objective of this study was to evaluate the effect of lake restoration by the hypolimnetic withdrawal method on the intensity of ambient odour in the vicinity of the pipeline outlet. The study was carried out in [2012][2013] -N), total nitrogen (TN), dissolved nitrogen (DN), total particulate nitrogen (T-PN), total organic carbon (TOC), dissolved organic carbon (DOC) and total particulate organic carbon (T-POC). Water samples were also analysed to determine total bacterial abundance (TBA) and the counts of bacterial rods, cocci and spiral-shaped bacteria, and sulphate-reducing bacteria (SRB). Significant variations in odour intensity

Zooplankton communities in a river downstream from a lake restored with hypolimnetic withdrawal

“…The occurrence of hydrogen sulphide is linked with decreased oxygen contents in the water. As Tandyrak et al (2016) demonstrated, these two parameters were significantly, inversely correlated in the Kortówka River. The occurrence of hydrogen sulphide in the waters of the studied river could have come from the deoxygenated, deep layers of the lake.…”

“…Differences in zooplankton abundance resulted from the fact that in the 1980s the water discharged into the river was mainly from the hypolimnion, which was less rich in zooplankton than was the lake surface water layer. Modifications to pipeline operation include shortening its operating time in the summer-fall period while simultaneously increasing the percentage share of the surface layer waters in the outflow (Dunalska et al, 2007;Tandyrak et al, 2016), thus minimizing the negative ecological impact of lake restoration that is based on reducing zooplankton abundance. This is how lake restoration is made more sustainable in terms of its environmental impact.…”

“…Therefore, the effect of hypolimnetic withdrawal lake restoration on the quality of downstream rivers must be investigated more thoroughly. Tandyrak et al (2016) were the first to attempt a complex assessment of the effect of lake restoration on a recipient river and its surroundings. The authors demonstrated that the hypolimnetic water inflow negatively affected the physicochemical properties of the water.…”

“…To date, no data has been published on the zooplankton community in the Kortówka River, nor is there any data in the literature on the impact lake restoration has on downstream zooplankton. Significant organic matter pollution, high oxygen demand and associated oxygen depletion, high hydrogen sulphide concentrations, and low temperatures (Tandyrak et al, 2016) are the main factors that can negatively affect zooplankton communities in the Kortówka River. The hypolimnetic water discharge of this restoration method can cause low zooplankton abundance.…”

Water Quality of Lake Ełk as a Factor Connected with Tourism, Leisure and Recreation on an Urban Area

“…TSI allows determining the fertility of the lake, which is directly connected with the occurrence of algal blooms (and chlorophyll a content in algae) and consequently, the transparency of the water (SD). The presence of algal blooms, especially cyanobacteria, periodically eliminates a bathing function of reservoir because of the toxic metabolic products of these organisms released into the water (Codd 1995, Tandyrak et al 2016. The presence of cyanobacterial is related to the ratio of TN/TP, the high value of this ratio is favourable, indicating the disappearance of cyanobacterial blooms and the growth of more desirable species.…”