A process of reducing concentration of contaminants contained in a contaminated wastewater stream comprises firstly, passing the contaminated wastewater stream into an electrocoagulation reactor for coagulating dispersed particles contained in the wastewater stream, filtering the wastewater stream after electrocoagulation to remove the coagulated particles; secondly, passing the filtered wastewater into a spouted bed bio-reactor (SBBR) containing a micro-organism or bacterium immobilised in polyvinyl alcohol (PVA) gel, filtering the wastewater after treatment by the SBBR; and thirdly, passing the treated wastewater into an adsorption column containing granular activated carbon (GAC). Preferably, the granular activated carbon comprises lignin based activated carbon made by carbonating granules of lignin-based material. Suitably, date pits activated carbon is utilised in the adsorption column. The process can reduce the chemical oxygen demand and the concentration of phenol and cresols by between 95% and 100%. The SBBR may comprise a jacketed Plexiglas (RTM) reactor configured to have a predetermined temperature controlled by water circulating around the jacket. A system for reducing concentration of contaminants contained in a contaminated wastewater stream is also claimed.
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