Pengolahan Limbah Cair Laboratorium dengan Adsorpsi dan Pretreatment Netralisasi dan Koagulasi

Abstract

The liquid waste of the UNIPA Surabaya Environmental Engineering laboratory has not fulfilled the requirements of the Minister of Environment Regulation Number 5 of 2014, so it needs to be processed so as not to pollute the Environment. This study aims to examine the effect of the coagulant dose of Poly Alum Chloride (PAC) on decreasing Pb, Cr, and TDS, assessing the quality of wastewater after neutralization, coagulation and adsorption for Pb, Cr, TDS, and pH parameters especially. The variables of this study were PAC doses of 150 mg / L, 225 mg / L and 300 mg / L. The research was carried out on a laboratory scale with a continuous downflow system. The adsorption media used are fibers, coconut fiber, bagasse activated carbon and multilevel zeolites in the reactor from the PVC pipe. Adsorption process is carried out for 2 hours and sampled every 15 minutes. The results of this study show that the PAC 300 mg / L produced the highest reduction efficiency, namely TDS 13.7% Cr 97%, Pb 93.5%. Furthermore, the quality of waste after neutralization, coagulated and adsorbed in the 15th minute were TDS 1.810 levels ppm, Cr total 0.36 ppm, Pb 0.66 ppm, so that wastewater has met the quality standards in accordance with Regulation of the Minister of Environment No. 5 of 2014. The pH however, does not meet the quality standard at 5.42.

Effectiveness of Well Water Treatment Method with Electrocoagulation, Coagulation, and Electrocoagulation-Coagulation Using Alum as Coagulant

“…When the anode oxidizes, Al 3+ ions are created, which react with OH-ions produced at the cathode to form Al (OH)3 as a coagulant. The Al(OH)3 destabilizes the colloids that cause turbidity and combine to create flocs [39]. The addition of alum coagulant to the dug well water helps the dug well water components decompose and form suspended elements that form flocs that rise to the water surface aided by hydrogen gas from the electrocoagulation process, creating two layers in the water with impurities on top and clean water on the bottom [40].…”

Pengaruh pH dalam Pengolahan Air Limbah Laboratorium Dengan Metode Adsorpsi untuk Penurunan Kadar Logam Berat Pb, Cu, dan Cd

“…Limbah padat dan gas tidak terlalu banyak tetapi limbah cair yang dihasilkan oleh laboratorium jumlahnya cukup banyak. Limbah laboratorium dapat berasal dari berbagai sumber seperti bahan kimia yang sudah kadaluarsa, bahan habis pakai yang pecah atau rusak, sisa sampel, sisa reagen reaksi-reaksi kimia, bahkan air bekas mencuci peralatan (Nurhayati, 2018). Banyaknya bahan-bahan organik dan anorganik yang terkandung dalam limbah laboratorium jika dibuang langsung ke lingkungan akan dapat merusak lingkungan seperti rusaknya struktur tanah, terganggunya keseimbangan ekosistem, serta dapat menyebabkan gangguan kesehatan manusia (Fajri, 2018).…”

Treatment of Laboratory Wastewater by Using Fenton Reagent and Combination of Coagulation-Adsorption as Pretreatment

“…The higher the dose of PAC and AS coagulant added, the higher the percentage of metal reduction. This increase was because the more coagulants were added, the more flocs formed (Nurhayati et al, 2018). Therefore, more metal can be separated from the wastewater.…”