No abstract

Penggunaan bahan bakar fosil untuk kendaraan bermotor di Indonesia berpotensi menghasilkan emisi udara yang dapat mencemari lingkungan terutama kesehatan manusia. Parameter yang sering dijadikan acuan pencemaran oleh emisi kendaraan bermotor yaitu NO2. Pada saat ini citra satelit telah dikembangkan dan dimanfaatkan di berbagai bidang. Salah satunya yaitu guna melakukan pemantauan kualitas udara. Tujuan penelitian ini yaitu melakukan analisa pengaruh rasio luas Ruang Terbuka Hijau (RTH) di Kota Surabaya dan Jakarta terhadap penurunan NO2 dilakukan pada penelitian ini. Metode yang digunakan dengan menggunakan data NO2 troposfer berdasarkan data total kolom NO2 citra satelit GOME 2 METOP B.  Hasil penelitian menunjukkan bahwa peningkatan luar ruang terbuka memberikan pengaruh terhadap penurunan angka NO2 di udara.

The excess content of phosphate in laundry wastewater can cause eutrophication. Ion exchange is a method that has been widely used to remove pollutants in wastewater. The study of ion exchange equilibrium is generally carried out by means of adsorption isotherms modelling. The use of adsorption isotherms to model ion exchange systems involves that it is interpreted as a sorption process. The performance of an adsorbent can be studied by adsorption isotherm data which can be obtained by the experimental test in the laboratory. Modeling of adsorption isotherm data is a fundamental way to predict and compare adsorption performance, which is needed for the optimization of the adsorption mechanism pathways, the expression of the adsorbent capacity, and effective design of the adsorption system. This research applied three isotherm models namely Langmuir, Freundlich, and Dubinin-Radushkevich to determine and compare the isotherm models that suits best to remove phosphate on laundry waste using Lewatit MonoPlus MP 500 OH anion resin. The best fitted for phosphate removal using Lewatit MonoPlus MP 500 OH was using the Freundlich isotherm model with 5 ml/minute for the best flow rate and 166 cm 3 anion resin volume.

Pollution caused by Cr(VI) metal is harmful because it is toxic and carcinogenic. Utilization of cow bone waste is considered not optimal. One of the utilization is as an adsorbent of Cr(VI) metal. This research aims to determine the adsorption capacity by bone waste bone adsorbent in lowered Cr(VI) metal, and to determine the adsorption isotherm model. Cow bone waste carbonized with furnace at a temperature of 800°C for 1 hour until it became charcoal. A size of 100 mesh and Na2CO3 5% activator were used and soak for 24 hours. In this research, shaker and waste simulation were used in batch method. Variations used include variation of mass of adsorbent (gram) : 0,4 ; 0.6 ; 0.8 ; 1 ; 1,2 and stirring time (minutes) : 15, 30, 60, 90, 120. The analyzed parameters were Cr(VI) metal concentrations. The research result showed that percent removal in optimum condition of adsorption adsorbent using cow bone waste at mass of 1,2 gram with stirring time 90 minutes was 66,92% for the non-activated adsorbent and 82,20% of percent removal at mass 1,2 gram with stirring time 120 minutes for the activated adsorbent. The adsorption isotherm followed the Freundlich model with the value R2 = 0,9968 for the nonactivated adsorbent and the value of R2 = 0,9909 for the activated adsorbent.

Oily wastewater pollution could affect source water quality since the industrial will discharge the treated wastewater into river body. Treatment methods of oily wastewater, including floatation, coagulation, biological treatment, has different capability to remove pollutant. Aim of this study is to compare the efficiency removal of combination of solidliquid separation process to remove, organic grease, oil and organic compound simultaneously. This study applied four treatments that is floatation only (F), coagulationfloatation (CF), floatation-activated sludge (FAS), coagulation-floatation-activated sludge (CFAS). Poly aluminum chloride (PAC) coagulant 50 mg/L was added as pretreatment, floatation was setup under pressure at 30, 50, 70 psi and recycle ratio 0.25; 0.5; 75. The results shown that combination solid-liquid separation, such as FAS have shown a good performance. It was observed that PAC coagulation as pretreatment had successfully enhanced solid-liquid separation process, such as in CF and in CFAS. CFAS system performed the highest removal of BOD 70% and 95% removal of grease and oil.