Judul: Penggunaan bahan pengisi tanah, kompos, arang sekam dan serasah dengan teknik biofilter untuk menghilangkan NH3 pada ruang produksi lateks pekat
Abstrak: Concentrated latex industry use concentrated liquid ammonia to stabilize latex, its emitted fugitive NH3 gas in high concentration. Ammonia is a odorous gas and easy to condense that cause exhalation problem and the oxidized ammonia (nitrit) is toxic and cause poisonous. This condition result to health problems for worker and local resident so a serious handling to treatment this air pollution is urgently needed. The objective of this research is to determine the best packing material composition to remove ammonia by using biofilter technique and to determine removal capacity of biofilters during operation. This research was conducted in three industrial scale biofilters using different packing materials. The first Biofilter packed with soil, charred chaff, peat leaf (2:l:l) and starter, the second biofilter used soil, charred chaK compost (1:1:2), and starter. The third biofilter used soil, charred chaff, compost and peat leaf and also given starter ( 1:1:0.5:0.5). The inlet and outlet of ammonia gas (NH3) concentration were measured for 55 days. The condition of packed materials were analyzed for water content, total of N, nitrate, ion ammonium, carbon and population of Nitrosomonas sp. and heterotroph bacteria every week, while pH was measured every three days.
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Judul: Penghilangan Polutan Gas Amoniak Dengan Biofilter Skala Pilot. Studi Kasus : PTPN VIII Pabrik Karet Cikumpay, Purwakarta, Jawa Barat.
Abstrak: Ammonia gaseous has a great potential to be a pollutant in rubber processing industries. The largest source of pollutant is at condensed latex processing. Therefore, biofilter was applied to remove emission of ammonia gaseous from the process. The objectives of this research were (1) to determine the level of physical and chemical absorption to ammonia sourness in forest soil based packing-bed material mixed with compost and carbonized rice husk, and (2) to determine the performance of biofilter to remove ammonia gaseous at pilot scale. Packing bed materials used were forest soil, bokashi compost and carbonized rice husk. The treatment of K111 was packed with forest soil, bokashi compost and carbonized rice husk with composised by 1:1:1. K112 was 1:1:2, K121 was 1:2:1, and K122 was 1:2:2. Physical and chemical characteristics of packing-bed materials within 5 parameters were obtained at ranked level of K112>K122>K111>K121. Carbonized rice husk influenced on physical - chemical characteristics of packing-bed materials, such as density, total porosity, water filled pore space and maximum capacity of loading, except air filled pore space. Those compositions were applied as packing bed materials to biofilters. Composition treatment of K111, K112, K121, K122 were applied to packing bed materials of B111, B112, B121 and B122. Biofilter were applied on pilot scale with 250 liters volume. For 55 days operation, ammonia pollutant concentrations were fluctuated from 0.18 to 68.66 ppm. Parameters inlet and outlet ammonia concentration, physical and chemical characteristics, population of ammonia oxidation bacteria and biofiltration process were monitored. Maximum removal capacities of B111, B112, B121 and B122 biofilters were 0.97, 1.46, 1.03 and 1.62 g-N/kg dry media. The result of biofiltration performance for 11 parameters showed that B112>B122>B121>B111. The best biofilter was determined by its ability in removing pollutant and the cost of required packing-bed. The price of packing bed materials from the lower prices were B111<B112<B122<B121. The cheapest price of packing bed material was B111, but it wasn’t a good performance of biofiltration. Therefore, B112 which was filled by forest soil, bokashi compost and carbonized rice husk with composition 1:1:2 was the best biofilter performance among them.
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Judul: Integration of Islamic Stock Markets of OIC Countries Before and During the Russia-Ukraine War Crisis
Abstrak: Pasar saham yang terintegrasi memberikan dampak negatif seperti percepatan co-movement (pergerakan bersama) yang rentan terhadap guncangan ekonomi, maupun krisis pasar global ke pasar domestik. Salah satu krisis yang terjadi pada tahun 2022 adalah perang Rusia-Ukraina yang berdampak pada pasar saham, termasuk pada saham syariah yang dipercaya lebih tahan terhadap guncangan krisis global. Penelitian ini bertujuan untuk meneliti perkembangan, integrasi dan respon lima pasar saham syariah negara OKI pada perang Rusia-Ukraina. Metode yang digunakan adalah VAR/VECM pada indeks DJIMMT25, SPSADS, SPSUAEDS, JII, DJIMT, SPBMIR, dan SPBMIU. Hasil penelitian menunjukkan pergerakan yang sama pada pasar saham UAE dan Arab Saudi, sedangkan Turki mengalami tren positif selama perang. Pasar saham syariah negara OKI selama periode perang Rusia-Ukraina terkointegrasi, sementara pasar saham Malaysia memengaruhi pasar saham syariah empat negara OKI lainnya. Hasil IRF menunjukkan terdapat efek permanen pada volatilitas pasar saham syariah negara OKI akibat guncangan yang diberikan. Namun, respon volatilitas relatif kecil karena kontribusi guncangan lebih didominasi oleh pasar saham itu sendiri, An integrated stock market has negative impacts, such as accelerating co-movement, which is vulnerable to economic shocks and global market crises on the domestic market. One of the crises in 2022 was the Russia-Ukraine war which impacted the stock market, including Sharia stocks which were believed to be more resistant to the shocks of the global crisis. This study examines the development, integration, and response of OIC countries five Islamic stock markets in the Russia-Ukraine war. The method used is VAR/VECM on the DJIMMT25, SPSADS, SPSUUAEDS, JII, DJIMT, SPBMIR, and SPBMIU indices. The results show the same movement in the UAE and Saudi Arabia stock markets, while Turkey experienced a positive trend during the war. The Islamic stock market of the OIC countries during the Russia-Ukraine war was cointegrated. In contrast, the Malaysian stock market influenced the Islamic stock markets of the other four OIC countries. The IRF results show a permanent effect on the volatility of the Islamic stock market in OKI countries due to the shocks given. However, the volatility response is relatively small because the stock market itself dominates the contribution of shocks.
Keyword: co-movement, OIC, Rusia-Ukraine war, sharia stock market integration