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Indonesia is known as the largest oil palm producer in the world. However, along with the production, it generates wastes and pollution that caused the environmental problem in surrounding areas. Previous researchers reported that the high palm oil mill effluent (POME) concentration inhibited microalgae growth. However, the inhibition factor was not clearly explained by using kinetic model. This study presents kinetic models of Botryococcus braunii (B. braunii) cultivated on POME wastewater under different turbidity condition. Results showed that the growth model of Zwietering was closely suitable with experimental results. It was found that B. braunii was able to consume organic carbon from the POME wastewater on the logarithmic model. A modified kinetic model of Monod Haldane described the influence of turbidity and chemical oxygen demand on the cultivation. Turbidity of POME medium inhibited the growth rate at KI 3.578 and KII 179.472 NTU, respectively. The Lipid (39.9%), and carbohydrate (41.03%) were found in the biomass that could be utilized as biofuel source.

Saat ini diperlukan alternatif energi baru terbarukan salah satunya minyak RCO (Rubber Compound Oil) yang dibuat dari bahan baku ban bekas. Pembuatan minyak RCO ini menimbulkan permasalahan berupa limbah karbon yang apabila dibuang akan menimbulkan dampak lingkungan. Diperlukan upaya untuk menangani limbah kabon hasil pirolisis ban bekas salah satunya adalah pembuatan karbon aktif guna meningkatkan nilai ekonomi limbah. Sehingga tujuan dari penelitian ini adalah untuk mempelajari kondisi operasi dalam pembuatan karbon aktif dari limbah hasil pyrolisis ban bekas. Karbon aktif merupakan salah satu adsorben yang dapat digunakan dalam pemurnian bahan. Penelitian ini membuat karbon aktif dengan menggunakan metode aktivasi kimia. KOH dipilih sebagai aktivating agent serta digunakan variabel suhu aktivasi dengan variasi suhu 700, 800, dan 900 °C dengan waktu aktivasi selama 30, 45, dan 60 menit. Pada penelitian ini diperoleh hasil karbon aktif terbaik dengan kondisi operasi 900 °C selama 60 menit yang menghasilkan luas permukaan karbon aktif seluas 230 m 2 /g. Kata Kunci: ban bekas, karbon aktif, aktivasi kimia ABSTRACT: Currently, alternative renewable energy is needed, one of which is RCO (Rubber Compound Oil) oil which is made from waste tires. The making of RCO oil causes problems in the form of carbon waste which, if discharged, will cause environmental impacts. Efforts are needed to deal with kabon waste resulting from used tire pyrolysis, one of which is the creation of activated carbon to increase the economic value of waste. So the purpose of this study is to study the operating conditions in the manufacture of activated carbon from waste produced by used tire pyrolysis. Activated carbon is one of the absorbents that can be used in material purification. This study makes activated carbon using a chemical activation method. KOH was chosen as activating agent and the activation temperature variable was used with temperature variations of 700, 800, and 900 °C with activation times for 30, 45, and 60 minutes. In this study, the best activated carbon was obtained with 900 °C operating conditions for 60 minutes which produced an active carbon surface area of 230 m 2 /g.

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