13-09-2012, 04:18 PM
TREATMENT OF PETROCHEMICAL WASTEWATER
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INTRODUCTION
Petrochemical Industry is called mother of chemical industry as it is building block for synthesis gas, olefins, aromatics, which are used for manufacture of basic chemicals and feed stocks for polymer, synthetic fiber, synthetic rubber, explosives, agrochemicals, dyes and intermediates, plasticizers, packaging materials etc.
The largest global petrochemicals companies (by 2008 revenue) are BASF (Germany), Dow Chemical (USA), ExxonMobil Chemical (USA), LyondellBasell Industries (Netherlands), INEOS (UK) and Saudi Basic Industries Corporation (Saudi Arabia).
Petrochemicals are chemicals made from petroleum (crude oil) and natural gas.
Fossil fuels-coal, crude oil or petroleum, natural gas liquids, and natural gas are the primary sources of basic petrochemicals.
Ethylene glycol was the first petrochemical in true sense, which was made by Union Carbide in 1923.
There are more than 4,000 petrochemical products that are made from petroleum (crude oil).
Reliance Industries, India's largest petrochemical producer.
OBJECTIVE OF WORK
4-Carboxybenzaldehyde is considered to be very toxic and is found in petrochemical wastewater. Following objectives are set for the present study:
Removal of 4-Carboxybenzaldehyde from wastewater by adsorption process using RHA as adsorbent.
To optimize the following design parameters for the removal of 4-Carboxybenzaldehyde Using BOX-BEHNKEN DESIGN. These design parameters include :
Dose of RHA
Contact Time
pH
Temperature
Percentage removal
To study the kinetic and isotherm model.
To study the characteristics of the RHA.
Characterization of original petrochemical wastewater .
METHODOLOGY
Adsorption process in which RHA(rice husk ash) is used as adsorbent and 4-Carboxybenzaldehyde as adsorbate.
The 4-Carboxybenzaldehyde in the aqueous solution was analysed by using UV-spectrophotometer (Perkin Elmer Lambda 35, Schimadzu, Japan). A standard solution of the 4-Carboxybenzaldehyde was scanned to determine the wavelength (max) corresponding to maximum absorbance. The wavelength corresponding to maximum absorbance was 258 nm. By using this wavelength a standard graph of absorbance versus concentration of 4-Carboxybenzaldehyde was prepared.
CONCLUSIONS
1. RHA is good adsorbent for the removal of p-CBA from wastewater through adsorption process as the removal efficiencies are around 89 %.
2. The various optimum condition for the process to be carried out are
pH = 2.5; Time=4h; adsorbent dose =5 g/L and Temperature =150C.
3. Pseudo second order kinetics is suitable for p-CBA removal by RHA its
R2 value is 0.9953