The potential impact of septic tank soil-absorption systems on water quality in the principal valley-fill aquifer, Ogden Valley, Weber County, Utah : assessment and guidelines

The water quality assessment of Lam Takong River and tributaries, from 20 stations, 6 times (October and December, 2008; February, April, June and August, 2009), revealed that overall water quality was in class 3 of Thailand surface water standard, except NH3-N, P and BOD. The maximum of NH3-N (12.6 mg/L), Phosphate 2.7 mg/L and BOD (8.7 mg/L) were found at Quartermaster Department Royal Thai Army Bridge, Nakhon Ratchasima Municipality pump in Lam Takong reservoir and Ban Ta Krasang, respectively, causing class 4 surface water standard in these areas. Moreover, trophic level of Lam Ta Khong River was mesotrophic; except they were meso-eutrophic after passing through Nakhon Ratchasima Municipality, Ban Ta Krasung, and Kan Pom dam before reaching Mool River. The season also affected on water quality. The value of pH, DO, BOD and NH3-N were significantly higher in dry season (p<0.01), while temperature, salinity and TSS were significantly lower in dry season (p<0.01). However, turbidity, TOC, NO3, NO2 and Chlorophyll-a in rainy season were higher than dry season but not statistically different. Pearson’s Correlation of 9 land use types on water quality showed that urban area was correlated with BOD, DO, NH3-N, PO4 and Chlorophyll-a (0.425, 0.380, -0.259, 0.445, and 0.339, respectively) higher than industrial area, scrub forest and water body. However, nitrate was mostly correlated with water body. Later, statistical models were developed from these results. WAPS was used to predict water quality in Lam Takong River. Three scenarios (present, 10 years, and 10 years with 25% BOD reduction) were simulated. The model predicts that water quality still decreases when flow through Nakhon Ratchasima Municipality. The minimum DO would reach 1 mg/L in ten years. However, if 25% BOD are reduced by future wastewater treatment plant and septic tank construction, the minimum DO would be 2.75 mg/L.

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Potential impact of floating solar panels on water quality in reservoirs; pathogens and leaching

Water Practice & Technology ◽

10.2166/wpt.2020.062 ◽

2020 ◽

Vol 15 (3) ◽

pp. 807-811

Author(s):

D. Mathijssen ◽

B. Hofs ◽

E. Spierenburg-Sack ◽

R. van Asperen ◽

B. van der Wal ◽

...

Keyword(s):

Water Quality ◽

Land Surface ◽

Local Environment ◽

Solar Panels ◽

Ongoing Research ◽

Naturally Occurring ◽

Storage Reservoirs ◽

Aquatic Flora ◽

Potential Impact ◽

Safety Of Drinking Water

Abstract Application of floating solar panels is especially suited for the Netherlands, given the limited availability of land (surface area). Evides water company owns and operates several open storage reservoirs which can be used for installation of these panels, but the installations could affect the local environment, naturally occurring processes and water quality. In this research, we evaluate leaching of various substances and possible effects based on a theoretical approach following the Analysis of Microbiological Safety of Drinking water (AMSD method). Besides the water quality issues, the ongoing research at Evides will focus on the effect of the floating solar installation on algae, microbiological and chemical parameters, birds, aquatic flora and fauna, and also look into possibilities of applying alternative storage possibilities using hydrogen.

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OIL POLLUTION STUDIES ON LAKE MARACAIBO. VENEZUELA

International Oil Spill Conference Proceedings ◽

10.7901/2169-3358-1975-1-489 ◽

1975 ◽

Vol 1975 (1) ◽

pp. 489-496 ◽

Cited By ~ 2

Author(s):

W.L. Templeton ◽

E.A. Sutton ◽

R.M. Bean ◽

R.C. Arnett ◽

J.W. Blaylock ◽

...

Keyword(s):

Water Quality ◽

Lake Water ◽

Oil Pollution ◽

Surface Films ◽

Fishery Resources ◽

Lake Maracaibo ◽

Commercial Species ◽

Potential Impact ◽

High Concentrations ◽

The Impact

ABSTRACT The results of a 2-year study on the impact of oil discharges on the fishery resources of Lake Maracaibo, Venezuela, are presented. The lake system is described, together with relevant water quality, hydrographic, ecological, and fishery resources data. Sources of other types of pollution, domestic and industrial, are described, and their potential impact on the system are discussed. Analysis of environmental samples-water, sediments, and biota-showed low concentrations of oil in lake water and no detectable accumulation of petroleum-derived hydrocarbons in muscle tissue of selected commercial species. The occurrence of bituminous materials in the sediments, particularly in the oil production area, suggests that the natural processes of volatilization, biodegradation, and sedimentation are the major mechanisms for the removal of oil from the surface waters. Laboratory studies on the toxicity of oil indicate that relatively high concentrations of oil are required to cause mortality. Extraction of oil with lake water, however, indicated that concentrations of total light aromatic fractions were toxic in the parts per million range. The rapid loss, in a few hours, of light hydrocarbons from surface films of oil to the atmosphere was shown to reduce the toxicity to organisms significantly. Examination of the limited fisheries data available does not suggest that the resources are being depleted. However, consideration of the potential impact of nonpetroleum wastes indicates that they are contributing to the degradation of the water quality which, if unchecked, may subsequently reduce the biological resources of the lake.

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