Search results for "Environmental engineering"
showing 10 items of 2674 documents
Examination of coagulant additives on qualitative composition of selected thermal waters
2017
On the territory of Poland occur rich deposits of thermal waters. Although the utilisation of these waters is continuously extending, Poland is not exploiting their full geothermal potential due to high investment costs. Thermal waters industry in Poland to date indicates operations within mainly balneology as well as recreation objectives. Higher temperature values of these waters foster a washout in the surrounding rocks resulting in a high concentration of diluted substances which must be often removed. The following study investigates thermal waters from three intakes for which coagulation processes were conducted. Research clearly shows that coagulant additives not impact on the qualit…
MICROBIAL FUEL CELL WITH Ni-Co CATHODE AND KMnO4 CATHOLYTE
2017
The improving standard of living causes the increases in energy consumption and waste or wastewater production. The possibility of combining wastewater treatment and electricity production can be accomplished by means of a microbial fuel cell. The possibility of wastewater treatment using the Ni-Co alloy as cathode catalyst with KMnO4 catholyte for microbial fuel cells was presented in this paper. The measurements covered the comparison of changes in the concentration of COD, NH4+ and NO3- in the reactor without aeration, with aeration and using a microbial fuel cell (with Ni-Co cathode and KMnO4 catholyte). The reduction time for COD using a microbial fuel cell with the Ni-Co catalyst (and…
FUEL CELL POWERED WITH CANOLA OIL EMULSION
2017
The paper presents possibility of using canola oil as active substance to fuel cell powering. For this purpose a prototype fuel cell was built. Cell was powered with canola oil emulsion. As a detergent Syntanol DS-10 was used. The mesh electrode with Pt catalyst was used as a anode, and mesh electrode with Ni-Co catalyst was used as a cathode. The measurements conducted in the temperature range 293-333K. The maximum current density reached the level of 2 mA/cm2, and maximum power reached the level of 21 mW (at temp. 333K). So, the possibility of delivery of canola oil (in emulsion form) directly to the anode was shown. The obtain power is low, but was shown that it is possible to build the …
ELECTROOXIDATION OF USED SYNTHETIC ENGINE OIL IN AQUEOUS SOLUTION OF H2SO4
2017
The paper presents possibility of using used synthetic engine oil to direct electricity production. The measurements conducted in the temperature range 293-333 K. Were measured electrooxidation of used synthetic engine oil emulsion on a smooth platinum electrode in an aqueous solution of H2SO4. The emulsion prepared on the basis of a nonionic surfactant Syntanol DS-10. The maximum current density reached the level of 22 mA/cm2 (temp. 333 K). Measurements shows possibility of direct electricity production from used synthetic engine oil emulsion, so powering fuel cell of this oil.
USE OF Ni-Co ALLOY AS CATHODE CATALYST IN SINGLE CHAMBER MICROBIAL FUEL CELL
2017
Technology of microbial fuel cells allowing for the direct production of electricity from biodegradable materials can provide only energy production, but also wastewater treatment. This technology is seen as supporting of the traditional wastewater treatment. One of the problems with microbial fuel cells is a low current density of those energy sources. Nonetheless, it is possible to increase the current density by using the catalyst for electrodes (anode and cathode). The possibility of wastewater treatment using the Ni-Co alloy as catalyst for single chamber microbial fuel cells is presented in this paper. The studies have included measurements of H2O2 reduction on Ni-Co catalyst, power o…
An Approach to Delineate Groundwater Bodies at Risk: Seawater Intrusion in Liepāja (Latvia)
2018
Groundwater quality in coastal areas is frequently affected by seawater intrusion as a consequence of intensive water consumption. To achieve “good chemical status” of a groundwater body according to Water Framework Directive the effects of saline or other intrusions should not be observed. Groundwater pumping in former decades has caused a significant seawater intrusion into confined aquifer in Liepāja and has led to deterioration of relatively wide coastal area of the third largest city in Latvia. However, the area affected by seawater intrusion is a small part of groundwater body F1 which overall chemical status is good. Thus, no specific management measures have been applied to explore …
QUALITY OF GROUNDWATER AND AQUATIC HUMIC SUBSTANCES FROM MAIN RESERVOIRE OF GROUND WATER No. 333
2015
The conducted research included the estimation of the quality of groundwater from the Main Reservoir of Ground Water No. 333 area in Opole District, Poland. The groundwater in the analyzed region shows high diversity in quality. The main threat for the quality of water in this region is the human household activity. The main pollutants of groundwater are: dissolved phosphorus, nitrate and ammonium. The quality and quantity of dissolved humic substances in groundwater were also investigated. The results showed that the contents of water-extractable organic carbon varied. Presently, the analyzed groundwater is characterized by large differences in dissolved forms of organic carbon. During mig…
Climate and extreme rainfall events in the Mono river basin (West Africa): investigating future changes with Regional Climate Models.
2020
This study characterizes the future changes in extreme rainfall and air temperature in the Mono river basin where the main economic activity is weather dependent and local populations are highly vulnerable to natural hazards, including flood inundations. Daily precipitation and temperature from observational datasets and Regional Climate Models (RCMs) output from REMO, RegCM, HadRM3, and RCA were used to analyze climatic variations in space and time, and fit a GEV model to investigate the extreme rainfalls and their return periods. The results indicate that the realism of the simulated climate in this domain is mainly controlled by the choice of the RCMs. These RCMs projected a 1 to 1.5 °
Optimal Solutions for the Use of Sewage Sludge on Agricultural Lands
2021
The use of sewage sludge in agriculture decreases the pressure on landfills. In Romania, massive investments have been made in wastewater treatment stations, which have resulted in the accumulation of important quantities of sewage sludge. The presence of these sewage sludges coincides with large areas of degraded agricultural land. The aim of the present article is to identify the best technological combinations meant to solve these problems simultaneously. Adapting the quality and parameters of the sludge to the specificity of the land solves the possible compatibility problems, thus reducing the impact on the environment. The physico-chemical characteristics of the fermented sludge were …
A New Water Governance Model Aimed at Supply–Demand Management for Irrigation and Land Development in the Mendoza River Basin, Argentina
2019
This study aimed at achieving an organizational solution for improving the governance of water and land use and, consequently, improving the supply&ndash