Degradation of organic pollutant in restaurant wastewater using the homogenous catalysis with Mn(II) and EDTA

It can be seen that the objects of wastewater that need to be treated are quite diverse in types and complex in terms of reaction mechanisms. The methods mainly focus on the treatment of toxic organic compounds, especially phenols or plant protection agents in industrial wastewater, paper industry, food production, textile industry, printing industry... The activation of H2O2 and O2 by complexes of transitional metal ions and suitable ligands creates oxidizing agents and ecologically healthy products. The intermediate substances arising in the activation process such as free radicals OH., O2., HO2., ... can oxidize many compounds, especially the ability to attack the aroma of organic pollutants. In this paper, the results of research on treating organic pollution in restaurant wastewater with H2O2 are presented as a catalyst of complexes between Mn2+ ions and EDTA. The conditions including pH, EDTA/Mn2+, the concentration of H2O2, Mn2+ were investigated to obtain the optimum conditions for improving COD treatment efficiency. This work proposes a method based on formation of the Mn(II)-EDTA complex, b=1; with the optimal conditions of other factors as following [H2O2]0 = 0,75.10-3 mol/L; [Mn(EDTA)]2- = 33,33 mol/L, pH=10.5; t = 15 minutes. The initial COD of 1025 mg/L decreased to 135 mg/L after the proposed procedure. The results provide solutions of homogeneous complex catalysts for domestic/restaurant and industrial wastewater treatment at room temperature and atmosphere.

Restaurant wastewater treatment with a two-chamber septic tank and a sequencing batch reactor

Restaurant wastewater in Indonesia comprises a variety of organic components that are difficult to degrade, such as COD, BOD, TSS, and oils and fats. Although grease traps are usually used to collect restaurant wastewater, the effluent still exceeds the applicable standards. For this reason, the combined technology of a two-chamber septic tank (ST) and a sequencing batch reactor (SBR) was chosen for this investigation. Both are biological treatment methods that involve an anaerobic and aerobic phase. This reactor will operate with a continuous influent flow that will be processed sequentially but discharged intermittently. The hydraulic retention time (HRT) of the ST-SBR was 12, 24, 36, and 48 hours, at aeration rates of 7 and 14 L/min, respectively. The results showed that introducing a Septic Tank increased the percentage of organic content removed and shortened the optimal HRT, resulting in a 24-hour optimal HRT and a 14 L/min aeration rate. With an average efficiency of 86.72% to 98.63% in removing organic components.

BIOFILTER AEROB MEDIA KALDNESS DALAM MENURUNKAN KADAR BOD, COD DAN TSS LIMBAH CAIR RUMAH MAKAN

Restaurant liquid waste is waste originating from the operational activities of a restaurant which is largely unprocessed, but disposed of directly to the receiving water body. This study aims to reduce Biogeochemical Oxygen, COD (Chemical Oxygen Demand), TSS (Total Suspended Solid) in restaurant wastewater by processing aerobic biofilter using caldness media. This type of research is an experiment with pretest-posttest research design. In this design, it is done to find out the initial condition of the subject before being treated so that it can determine the condition of the subject under study before the treatment can be compared or seen changes in the analysis of data used using the Pretest-Posttest test in order to determine the differences in 2 treatment groups. The results of examination of the levels of BOD, COD and TSS before treatment with the BOD Caldness medium were 333,822,00 mg/ liter, COD was 575,535,00 mg/ liter and TSS was 580,136,00 mg/ liter. After treatment with a medium of Caldness of BOD of 580 mg / liter, COD of 1019 gr / liter, and TSS of 430 gr / liter. The conclusion of this study is that the results obtained after processing used Kaldnes media were very in reducing BOD by 99.98%, COD by 99.82% and TSS by 99, 92% in restaurant wastewater treatment.Keywords: Restaurant Wastewater, BOD, COD and TSS

Comparison of the Effectiveness of Alum, Chlorine, Sodium Hypochlorite and Moringa’s Seeds in Reducing Bacterial Loads in the Treatment of Restaurant Wastewater

The effectiveness of different wastewater-treating agents were individually analysed and compared to one another in reducing bacterial counts (total bacterial and total coliform counts) during the treatment of restaurant wastewater. These agents include alum, chlorine, sodium hypochlorite and seeds of Moringa oleifera. Wastewater samples were collected at interval and analysed for bacteriological and physiochemical properties. Bacteriological analyses include total bacterial and coliform counts, while physiochemical analyses include pH, total titratable acidity (TTA), biochemical oxygen demand (BOD), total hardness, alkalinity and mineral components. Moringa oleifera seeds, was found to be very effective as a sedimentation agent, but least effective in reducing bacterial counts. Also, it was discovered that the seeds of M. oleifera aid the increase in the bacterial population. Alum, a non-bactericidal, sedimentation agent, was found to reduce total bacterial and coliform counts mainly by the use of flocculation. Chlorine was found to be bactericidal against all bacteria except Pseudomonas aeruginosa, while sodium hypochlorite was found to be most effective in reducing bacterial growth during the study.