Adsorbent is one of the effective solutions to reduce the Hg metal content. The golden snail is a pest for agricultural and contains high of calcium carbonate. However, calcium carbonate can be used as an adsorbent. This study aimed to examine the effectiveness of golden snail shell powder in absorbing Hg metal. This research is a quantitative study consisting of dependent variables and independent variables. The dependent variable involved a concentration of 10 ppm mercury, and 100 rpm stirring time speed while the independent variable included of variations in powder mass and stirring time. The mass of golden snail powder used those are 0 gr, 5 gr, 10 gr, 15 gr, and 20 gr with a variation of stirring time for 15 minutes and 30 minutes for each sample of Hg metals. Each Hg sample was used at a concentration of 10 ppm. The calculation results obtained that the effectiveness of golden snail shell powder in absorbing Hg 10 ppm was the mass of 20 grams of golden snail powder with a stirring time of 30 minutes that was equal to 99.87% with the result of a decrease in concentration of 10 ppm Hg to 0.01 Hg ppm.

Indonesia is an archipelagic country located on the equator. The issue of climate change has become a global issue that has impacted several sectors in Indonesia recently. The presence of the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) has contributed to conducting studies on flood and drought events. This review paper summarized 16 published papers that have gone through peer-review, both in the form of publications in journals and at conferences. Since the release of the IPCC AR5 to date, ten studies on flooding and six studies on drought events have been conducted. The most publications on this in 2019 were five publications. Of the various types of the Representative Concentration Pathway (RCP) scenarios used with various methods, the most widely used scenario RCPs is RCP4.5. From the climate change scenario, precipitations parameter is the main parameter that is used in assessing flood or drought events. There are studies conducted on a district / city, provincial scale, and some are even carried out on a watershed scale. The location or province that most flood studies have been carried out is in the capital of Jakarta. The results of these studies generally indicate that the incidence of floods and droughts will increase in the future. Therefore, adaptation steps are needed to deal with unfavorable conditions in the future. Moreover, as the capital city, Jakarta has been estimated that the projected flood incidence will increase. Several publications have provided steps to deal with these challenges on the positive side.

The coating substance on tomato, apple, and kiwi from carrageenan of Eucheuma cottonii that originated from Aceh was made with additional PEG (polyethylene glycol) plasticizer to increase the fruit shelf life. Carrageenan of Eucheuma cottonii was extracted using 14% alkaline solution (KOH) and precipitated using IPA (isopropyl alcohol). The coating substance was made using various combination of carrageenan (0,1%, 0,2% 0,3%) and PEG (polyethylene glycol) with concentration 0,5% (v/v). Fruit coating process was carried out by immersion until the whole fruit well submerge. The examination was carried out through functional groups identification of carrageenan from Eucheuma cottonii and the coating substance. The coating substance was observed toward fruits resistance to see changes in physical shape and hardness of fruit and used a microscope with 450 times enlargement to observe the fruit surface at 0 day, 6 th day, 12 th day and 18 th day. As the result, carrageenan that extracted from red seaweed (Eucheuma cottonii) shown the suitable structure with the commercial carrageenan. From the observation result, coated fruits resistance which was observed at 12 th day shown apple and tomato have a better hardness and physical appearance with 0,3% carrageenan than with 0,1%, 0,2%, and control, meanwhile for kiwi with 0,2% carrageenan.

ABSTRAK. Logam berat  Pb merupakan logam berat yang berbahaya bagi kesehatan. Logam Pb dapat merusak sistem organ. Salah satu cara untuk mengurangi adanya kandungan logam Pb dapat dilakukan dengan penggunaan adsorben. Keong mas merupakan salah satu hama bagi aktivitas pertanian. Di dalam cangkang keong mas mengandung banyak kalsium karbonat. Kalsium karbonat dapat dijadikan sebagai adsorben. Penelitian ini bertujuan untuk menguji keefektivan serbuk cangkang keong mas dalam menyerap logam Pb. Penelitian merupakan penelitian kuantitatif. Terdiri dari variabel terikat dan variabel bebas. Variabel terikat terdiri dari konsentrasi 10 ppm timbal dn kecepatan waktu pengadukan 100 rpm. Sedangkan variabel bebas terdiri dari variasi massa serbuk dan waktu pengadukan. Massa serbuk keong mas yang digunakan yaitu 0 gr; 5 gr; 10 gr; 15 gr dan 20 gr dengan variasi waktu pengadukan selama 15 menit dan 30 menit untuk tiap sampel Pb. Tiap Pb yang digunakan dengan konsentrasi 10 ppm. Berdasarkan hasil perhitungan yang diperoleh didapatkan hasil efektivitas serbuk cangkang keong mas dalam menyerap Pb 10 ppm terdapat pada massa 5 gr serbuk cangkang keong mas dan dengan waktu pengadukan 15 menit yaitu sebesar 99,99% dengan hasil penurunan konsentrasi Pb 10 ppm menjadi Pb 0,0001 ppm

<p>Engine oil waste is a pollutant that causes environmental pollution and risk for human health. Bioremediation is one of the solutions to solve this problem. In this research, engine oil waste was remediation by composting method. The composting process was conducted in Environmental Engineering laboratory for 35 days.  Water Content and total petroleum  hydrocarbon (TPH) was analyzed in Chemical Engineering laboratory to show the degrada-tion of engine oil waste by combining of liquid fertilizer and compost. The result showed that Total Petroleum Hydrocarbon (TPH) of engine oil waste degradation reached 81% in sample 8 (by combined 8 mL of liquid or-ganic fertilizer and 300 g of compost soil). Sample 12 (by combined 2 mL of liquid organic fertilizer and 500 g of compost soil) also showed the same result</p>