Industri Pengolahan Makanan, dalam mengolah air limbah telah memiliki sarana pengolahan air limbah berupa IPAL dengan mengkombinasikan teknik elektrokoagulasi dan filtrasi (karbon filter). Peningkatan kegiatan produksi yang tidak dibarengi dengan perubahan pada sistem IPAL menyebabkan beban air limbah yang dihasilkan dari kegiatan produksi meningkat. Hal  ini menyebabkan air olahan IPAL tidak memenuhi baku mutu air limbah. sehingga perlu dilakukan evaluasi terhadap IPAL yang ada. Tujuan kegiatan ini adalah melakukan evaluasi kinerja dari IPAL Industri Pengolahan Makanan. Dari hasil pengukuran parameter polutan pada air limbah hasil proses elektrokoagulasi di IPAL eksisting adalah nilai COD, BOD dan TSS mengalami penurunan berturut–turut yaitu sebesar 60% dari 3.083 mg/L menjadi 1.055 mg/L; 67% dari 820 mg/L menjadi 273mg/L dan 55% dari 398 mg/L menjadi 178 mg/L. tingginya nilai tersebut menunjukan bahwa beban polutan pada air limbah hasil proses elektrokoagulasi masih tinggi. Hal ini menyebabkan air olahan hasil IPAL masih diatas baku mutu air limbah yaitu dengan nilai COD, BOD dan TSS berturut-turut  751 mg/L, 194 mg/L dan TSS 164 mg/L. Kata Kunci: Limbah cair, industri pengalahan makanan, elektrokoagulasi, karbon filter

Industri pengolahan makanan dalam melakukan kegiatannya membutuhkan air bersih untuk memenuhi keperluan domestiknya. Sebanyak 80% dari pemakaian air bersih tersebut akan dibuang sebagai air limbah. Air limbah ini bila tidak dikelola dengan baik dapat mencemari lingkungan. Oleh karena itu air limbah tersebut harus diolah terlebih dahulu sebelum dibuang ke saluran umum. Teknologi biofilter dapat diaplikasikan untuk mengolah air limbah domestik sehingga menghasilkan air olahan yang layak dibuang ke saluran umum. Tujuan dari kegiatan ini adalah merencanakan Instalasi Pengolahan Air Limbah (IPAL) domestik di Industri Pengolahan Makanan dengan menggunakan teknologi biofilter.Kata Kunci: Limbah domestik, industri pengalahan makanan, biofilter

This experiment utilized dairy industry wastewater, which is located in Sukabumi, West Java, Indonesia. The aim of this experiment was to evaluate the biomass production and dairy wastewater treatment using Chlorella vulgaris. The experiment lasted for 6 months (July – December 2019). Monthly water analyses for a variety of physical-chemical factors were also investigated. Microalgae were cultivated in a 10 m3 raceway bioreactor type. The results indicated that a decrease in the concentration chemical substances of the wastewater, namely 74% N-amonia, 77% total nitrogen (TN), 78% total phosphate (TP), 92% Chemical Oxygen Demand (COD), and 77% Biological Oxygen Demand (BOD) within 10 days of the process. A maximum of 1.2 g/L dry biomass was obtained in 18 days. The percentage lipid content was determined by soxhlet extraction and was shown to be 25%. To sustain the growth of microalgae, it was necessary giving 3.5 mg NPK/L on the tenth day and then continuously added.

Palm oil mill effluent (POME) contains very high organic compounds that must be treated before being discharged into the environment. Pond technology has been widely used for the treatment of POME; however, it requires a huge area of land. Down-flow hanging sponge (DHS) reactor has shown a high pollutant removal efficiency, less energy, and land area requirement. This study aimed to investigate the performance of a series of anaerobic (R3) and aerobic (R4) DHS reactors in treating POME. The reactor was continuously supplied with POME in three different phases for 165 days. The COD loading rate was set at 3.06, 6.12, and 12.24 kg-COD/m³·day in Phase 1, Phase 2, and Phase 3, respectively. Hydraulic retention time (HRT) was set at 47 min and 50 min, in R3 and R4, respectively. The reactors showed good performance for pollutant removal efficiency, especially COD. In Phase 1, the average COD removal rate was 2.68 and 0.27 kg-COD/m³·d in R3 and R4, respectively. In Phase 2, when the COD loading rate was increased, the average COD removal rate achieved 4.12 and 1.53 kg-COD/m³·d in R3 and R4, respectively. In Phase 3, the COD loading rate was doubled to 12.24 kg-COD/m³·day and the average COD removal rate of 5.81 and 2.90 kg-COD/m³·d was achieved in R3 and R4, respectively. During operation, the concentration of nitrate fluctuated in R4, which indicated that nitrification had occurred. Phosphate could be reduced in R3, but only a small portion could be removed in R4. Total suspended solids (TSS) could be effectively removed in R4. These results revealed that a combination of anaerobic-aerobic DHS reactors showed good performance in removing pollutants such as COD and TSS. Therefore, DHS technology can be used as a polishing treatment for treated POME.

Abstract-It is generally recognized, that algae could be an interesting option for reducing CO 2 emissions. Based on light and CO 2 , algae can be used for the production various economically interesting products. Current algae cultivation techniques, however, still present a number of limitations. Efficient feeding of CO 2 , especially on a large scale, is one of them. Current methods for CO 2 feeding to algae cultures rely on the sparging pure CO 2 or directly from flue gas. The limiting factor in this system is the solubility of CO 2 in water, which demands a considerable amount of energy for an effective gas to liquid transfer and leads to losses to the atmosphere. Due to the current ineffective methods for CO 2 introduction into algae ponds very large surface areas would be required for enough ponds to capture a considerable amount of the CO 2 . The purpose of this study is to assess technology to capture carbon dioxide (CO 2 ) emissions generated by industry by utilizing of microalgae Chlorella sp. The microalgae were cultivated in a bioreactor culture pond raceway type. The result is expected to be useful in mitigating the effects of greenhouse gases in reducing the CO 2 emissions. The research activities include: (1) Characterization of boiler flue gas, (2) Operation of culture pond, (3) Sampling and sample analysis. The results of this study showed that, the initial assessment absorption of the flue gas by microalgae using 1000 L raceway pond completed by heat exchanger were quite promising. The transfer of CO 2 into the pond culture system was run well. This identified from the success of cooling the boiler flue gas from the temperature of about 200 °C to below ambient temperature. Except for the temperature, the gas bubbles into the culture media were quite fine. Therefore, the contact between the gas and the media was well performed. Efficiency of CO 2 absorption by Chlorella sp reached 6.68 % with average CO 2 loading of 0.29 g/L/day. Index Terms-Chlorella sp., CO 2 emission, heat exchange, microalgae, milk industry, raceway pond.