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Sanlúcar la Mayor, Spain

In a wastewater treatment plant (WWTP), the control of nitrification and denitrification by continuous measurement of ammonium and nitrate contributes to an improvement in process control automation, and to optimize the system reducing energy costs. The study aims to compare two measurement technologies of the ammonium concentration: a UV ammonium analyzer and ion-selective electrode (ISE). UV analyzer is an equipment with good accuracy but requires daily maintenance tasks because the presence of filamentous scum has a negative effect. ISE technology provides a continuous measurement and permits to distinguish trends, but has a much lower accuracy and is strongly affected by the point where the ISE probe has been installed.

Silvestre G.,Technology Center | Ruiz B.,Technology Center | Fiter M.,Technology Center | Ferrer C.,Facsa | And 3 more authors.
Ozone: Science and Engineering | Year: 2015

The aim of the present study was to improve the anaerobic biodegradability of waste-activated sludge by using ozonation. The effect of different ozone doses was assessed in terms of biogas production, maximum biogas production rate, and concentration of amino acids and long-chain fatty acids in the waste-activated sludge. Four different doses were used: 0.043 gO3 gTSS− 1, 0.063 gO3 gTSS− 1, 0.080 gO3 gTSS− 1, and 0.100 gO3 gTSS− 1. The lower doses resulted in biogas production increases and a higher maximum biogas production rate in the anaerobic digestion of waste-activated sludge, while the contrary occurred at higher doses. The amino acids and long-chain fatty acids concentrations decreased when the ozone dose increased. The correlation with the ozone dose was nonlinear for amino acids and linear for long-chain fatty acids. The reaction products of long-chain fatty acids (aldehydes) are proposed as the cause of inhibition observed in the anaerobic digestion of waste-activated sludge treated with higher ozone doses © 2015, International Ozone Association.

Due to the high cost of the electric power, this study compares the functioning of a conventional blower with rotary pistons and a high speed turbocompressor with magnetic levitation bearings. The parameters studied are: energetic consumption, acoustic pollution and maintenance. It can be observed that the ratio of average consumption of the magnetic levitation turbocompressor in the aeration system is minor that that of the rotary piston blower, which supposes energy savings on having used the first equipment of aeration. In addition, the magnetic levitation turbocompressor issues much less noice than the rotary piston blowers and its maintenance costs supposes a saving of 42% with regard to the cost of the conventional blower.

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