... , its application field from the early desalination expanded to chemical, pharmaceutical, electronic, electric power, biological, beverage and ... (maximum O.l mg/L)Oil: 0Chemical oxygen consumption (COD) : < 1 Omg/LBiochemical oxygen consumption (BOD) : < 5 mg/L ... electrode foil and other electronic components rinse water4 Metallurgy, chemical industry, power plant and big, medium-sized mining ...