Reduksi pencemar limbah cair industri tahu dengan tumbuhan melati air (Echinodorus palaefolius) dalam sistem kombinasi constructed wetland dan filtrasi Reduction of the pollution parameters in tofu industry wastewater by water jasmine plant (Echinodorus palaefolius) in constructed wetland and filtration combination system
Waste cooking oil is used oil that has been used for domestic purposes and has undergone changes, both physically and chemically. One effort that can be done to reduce the adverse effects of used cooking oil is changed the material used cooking oil into biodiesel. In this study of biodiesel production from waste cooking oil is done by using biodiesel transesterification reaction as generally through a pretreatment in order to reduce the number of Free Fatty Acid in cooking oil. The high number of Free Fatty Acid will complicate the separation of glycerol from biodiesel so that production of biodiesel will be slight. Test parameters of biodiesel quality produced by transesterification process refers to the Indonesian biodiesel quality standard ISO 7182: 2015. The production of biodiesel from used cooking oil in this experiment using variations methanol and sodium hydroxide solution ratio to the used cooking oil is 1: 2; 1: 4 and 1: 8. Test results showed that the quality of biodiesel is in compliance with ISO 7182: 2015 on the parameters of viscosity, density and flame test. While the Free Fatty Acids remained above the quality standard ISO 7182: 2015.Keywords : Waste cooking oil, Transesterification, Biodiesel
Laundry wastewater is grey water, which is part of domestic wastewater, which is not through the toilet. Laundry wastewater contains COD, BOD, TSS, Total Phosphate, pH, MBAS which includes derivatives of organic substances so that the accumulation causes an increase in the organic content of water or groundwater. The purpose of this study was to observe the effects of the hydraulic loading rate (HLR) and permeable layer (zeolite and gravel) on the efficiency of decreasing laundry wastewater pollutants. Variations in HLR consist of 500 l / m2 day, 750 l / m2 day and 1000 l / m2 day. In this study, laundry wastewater was introduced gravitationally into the MSL reactor with dimensions of 15x50x50 cm. The MSL reactor consists of impermeable layers and permeable layers. The impermeable layer is a layer consisting of a mixture of soil and charcoal with a ratio of 2: 1, and a permeable layer consisting of layers of gravel (MSL 1) and zeolite (MSL 2) with a diameter of 0.25 - 0.5cm. Based on the results of the study, the HLR and permeable media have an effect on the decrease of laundry wastewater pollutant parameters. The highest decrease in pollutants for COD, BOD, TSS, Total Phosphate, pH, and MBAS parameters was obtained at HLR 1000 l/m2.d with the highest percentage reduction is 95% at MSL 1 and 92% at MSL 2. Decreasing pollutant concentration of laundry wastewater is higher in MSL 2 (permeable layer of zeolite) compared to MSL 1 (permeable layer of gravel).
Some of tofu industries in Jambi City are household industries, where the wastewater from processing unit was disposed of into the environment without treatment. This study aims to analyze the effect of detention time and the effectiveness of decreasing COD concentration and pH neutralization on wastewater of tofu industry using a sub surface flow - wetlands (SSF-wetland) system combined with a filtration system. The plant selected in this study was water jasmine (Echinodorus palaefolius). Variables of waste water detention time in the reactor are 5, 7, 9, 11, 13 and 15 days. Decreasing of COD concentration and increasing of pH were analyzed by comparing influent and effluent from wastewater samples, also the effect of detention time on the effectiveness of parameter reducing on each system. The water quality standard refers to the regulation of the Minister of Environment and Forestry Number 68 Year 2016. The results showed excellent performance from a combination of the two systems where an initial pH with range of 3 increase to pH 6.5-7. The efficiency of reducing COD concentration reached 47-94% during the 15-day detention time with concentration value 125 mg / l, close to the standard value 100 mg / l. The residence time has more significant effect on the reduction of COD in the SSF-Wetland system than the filtration system. Whereas in pH parameters, the residence time does not have a significant effect on both systems.
Pengaruh pH dan dosis adsorben dari limbah lumpur aktif industri crumb rubber terhadap kapasitas penyerapan ion Cd(II) dan Zn(II) The effect of solution pH and adsorbent dosage on the adsorption of Cd(II) and Zn(II) ions from aquoeous solution by activated sludge of crumb rubber industry
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