Reduction of metals in production plant's effluents by applying air Micro-Nanobubbles in a factory of Lead Acid Batteries of the district of Puente Piedra, Lima

Abstract

The Lima city has industrial areas that generate many industrial effluents that affect the public health and environment. The problem studied in a factory of Lead Acid Batteries located in Puente Piedra, Lima is, that it generates and discharges acidic wastewater (pH = 1.52). The research was experimental, at the laboratory level, to apply the treatment with Micro-Nanobubbles of air to these industrial waters, which contain metals such as Aluminum (14.967 mg / L) and Lead (4.227 mg / L), strongly acidic (pH 0.55). Then the pH was adjusted into two samples with Sodium Hydroxide 1 M until obtain acid (6.01) and basic (8.92) pH media in order to apply the Micro-Nanobubbles ( MNBs) into these samples. Micro-Nanobubbles were then generated by a device for Micro-Nanobubbles generation patented by PhD. Jhonny Valverde Flores. The air pressure was 90 PSI, the size of the MNB was 7 μm, the water flow was 4.67 L / min. Three samples (S1, S2, and S3) were dosed in 1 L each one. The volume ratio of water effluent / water with MNBs for S1 was 3/7, for S2 was 6/4 and for S3 was 7/3. The treatment lasted 8 minutes and as results of the research after applying MNBs, the Aluminum’s concentration in S1 decreased to 1,176 mg / L, in S2 decreased to 1,421 mg / L and in S3 decreased to 11,996 mg / L, achieving an efficiency of 92.14 %, 90.51% and 19.85%, respectively; And the Lead's concentration in S1 decreased to 0.264 mg / L, in S2 decreased to 0.065 mg/L and in S3 decreased to 0.116 mg / L, achieving an efficiency of 93.75%, 98.46% and 97.26%, respectively.