Pre-treatment of industrial waste water with hydrocarbon separators
2019
Vasilica, S., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Andra, S.M., PURECO Environment SRL, Bucharest (Romania) | Popa, L., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Nedelcu, A., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Ciuperca, R., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania)
The aim of the article is to present a pre-treatment of industrial waste water with hydrocarbon separators. Three hydrocarbon separators with a coalescing filter were tested in three different situations (car wash, fuel station and parking lot). The quality of treated water that is leaving the separator must comply with the conditions of NTPA 001/2005 for wastewater discharge into natural receivers. The maximum amount of light liquid hydrocarbons in the effluent separator is 5 mg•lE−1. Petroleum products at concentrations of 0.1 to 10 mg•lE−1 present in the surface area and wastewater are determined spectrophotometrically according to SR 7877-2/1995, petroleum products together with some substances present in water are extracted at pH 5 in CCl4 (Carbon tetrachloride). Pre-treatment of polluted water discharged into the environment or into the sewage system is a necessity in order to protect the environment. Sizing the three light liquid separators is based on the nature and flow rate of the liquids to be treated and considering the following: the maximum flow of rainwater, the maximum flow of wastewater (e.g. industrial effluent), the density of the light liquid, presence of the substances that may impede separation (e.g. detergents). Oil separators nominal size is determined by the flow rate of 45 l•h•mE−2 for areas not covered. A coefficient of 0.5 is applied to the surfaces provided with the cover. The novelty of the proposed separation system is that in a steal tank all components are introduced: the hydrocarbon separator with a coalescing filter, retention tank and the pumping station. Thus, by integrating all components into a single container divided into several independent compartments, savings in space and mounting time are achieved.
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