ANALYSIS OF WASTE WATER FROM ECOLOGICAL CAR WASH – A CASE STUDY
Journal Title: Journal of Science And Arts - Year 2011, Vol 15, Issue 2
Abstract
Wastewaters resulted from different stages of washing process from ecological car wash were investigated for its physicochemical parameters and several heavy metals contents. For this purpose 75 samples were collected and analyzed by conductometric, potentiometric techniques and by Flame Atomic Absorption Spectrometry during of November 2010. The results showed that the amount of zinc, copper, cadmium and lead elements in wastewater samples were higher than the Maximum Admitted Level (MAL) values for investigated heavy metals, according to the Order 161/2006, after washing different cars in one week (from Monday to Friday at 14,00). The increase of Pb, Cu, Cd, and Zn concentrations is visible (average weekly collections) and these were higher especially on rainy days when cars came with a load more visible than in the days with good weather. In according with the Order 161/2006, regarding pH tolerance limit, the mean pH values for all collected samples were between 6.00 and 9.00. The temperature ranged between 14.10 - 17.10°C with an average value of 14.91±1.61°C. The highest values for conductivity, turbidity and TDS was found for samples Sp2, Sp5, Sp8, Sp11 and Sp14, before entrance in the first separator.
Authors and Affiliations
CRISTIANA RADULESCU, CLAUDIA STIHI, ION POPESCU, VASILE NITESCU, IOANA DULAMA, ANCA GHEBOIANU, ANDREI CHILIAN, ALIN BUCURICA, OANA BANCUTA
ON THE EXISTENCE AND STABILITY OF PERIODIC SOLUTION FOR BAM NEURAL NETWORKS WITH DELAYS
The purpose of this paper is to present some sufficient conditions ensuring existence, uniqueness and global stability of almost periodic solution of the BAM neural networks with variabile coefficients and delays, by usi...
SOME GRONWALL TYPE INEQUALITIES WITH APPLICATION IN DATA DEPENDENCE FOR FUNCTIONAL DIFFERENTIAL EQUATION
INTEGRAL INEQUALITIES
Several integral forms of Bergstrom’s, Bohr’s, Jensen’s inequalities will be given below, and other inequalities will be also investigated in this paper.
ABOUT HERON'S FORMULA FOR CUBE ROOT
In this paper we extend the Heron's method for cube root to nth root and give an automatic error control using interval arithmetic.
ASSESSMENT OF RIVER WATER QUALITY IN CENTRAL AND EASTERN PARTS OF ROMANIA USING ATOMIC GF5AND OPTICAL METHODS
The main objective of this paper is to assess the water quality of some rivers from Brasov, Braila and Galati counties (Timis, Danube and Prut) using atomic and optical methods: Atomic Absorption Spectrometry (AAS), UV-V...