Organic and Isotopic Geochemistry of Evaporites and Shales of the Santana Group (Araripe Basin, Brazil): Clues on the Evolution of Depositional Systems and Global Correlation during the Lower Cretaceous

Even being the more studied of the interior basins of Northeast Brazil, the Araripe Basin still lacks research in organic geochemistry designed to support interpretations of depositional systems and conditions of formation. This work aims to investigate the organic behavior of evaporites and shales from the Santana Group (Lower Cretaceous), as well as discuss their role in the evolution of its depositional systems. A total of 23 samples, 17 shales and six evaporites, were collected in outcrops and quarries. Analyses of Total Organic Carbon (TOC), Total Sulfur (TS), Rock Eval pyrolysis, and the δ34S isotope ratio were performed. The TOC results revealed high organic content for seven intervals, of which only five had high TS content. From the Rock Eval pyrolysis, dominance of the Type I kerogen was verified, thus corresponding to the best type of organic matter (mainly algal) for the generation of liquid and gaseous hydrocarbons. The Lower Cretaceous (probably Aptian) response to the progressive evolution in redox conditions is linked to a remarked Oceanic Anoxic Event (OAE-1a). The TOC/TS ratio suggests variable palaeosalinity, indicating most of the shales were formed under brackish waters with saline influence, yet tending to increase the salinity upwards where hypersaline conditions dominate in the Ipubi Formation. The isotope data also suggest the occurrence of marine ingressions in the depositional systems even prior to the well-documented event of the Romualdo Formation.

Effectiveness of Moringa oleifera and PAC (Poly Aluminum Cloride) Leaves in Peat Organic Substances in Rasau Jaya Village, Kubu Raya Regency

One source of surface water in West Kalimantan is peat water that has low turbidity, dark brown to black (124 - 850 units of PtCo), high organic content (138-1560 mg / L KMnO4), and is acidic (pH 3,7 - 5,3). The purpose of this study was to determine the effect of the addition of PAC and Moringa oleifera leaves to the decrease in levels of peat organic water in the Rasau Jaya village area, Kubu Raya Regency. The method used in this research is by mixing Moringa leaf powder and PAC (Poly Aluminum Cloride) in peat water accompanied by stirring and precipitating. Furthermore, peat water samples were analyzed for their organic content using the permanganometric titration method. The results showed that the levels of organic substances in peat water before the addition of PAC and Moringa leaf powder amounted to 176.96 mg / l, after the addition of 125 mg PAC and Moringa leaf powder with concentrations of 25, 50, 75 l , 100, 125, 150, 175, 200 mg/l, respectively: 42.04 mg / l, 46.97 mg / l, 58.14 mg / l, 66.15 mg / l, 67.20 mg / l, 60.25 mg / l, 63.41 mg / l, and 53.07 mg / l. Based on the results through regression statistical tests obtained sig = 0.015 <0.05 which means Ha is accepted that there is an effect of increasing the concentration of Moringa oleifera powder and PAC on Organic Content in Peat Water in Rasau Jaya Village, Kubu Raya Regency.

The asteroid 162173 Ryugu: a cometary origin

The Japanese Hayabusa2 mission has revealed in detail the physical characteristics of the C-type asteroid 162173 Ryugu, in particular, its spinning top-shaped rubble pile structure [1] and the potentially extremely high organic content [2,3]. A widely-accepted formation scenario for Ryugu is catastrophic collision between larger asteroids and the subsequent slow gravitational accumulation of collisional debris [4,5]. However, the collisional re-accumulation scenario does not explain the origin of the abundant organic matter. An alternative scenario is that Ryugu is an extinct comet, which lost its icy components [2,6,3]. Here, the sublimation of water ice from a uniform porous cometary nucleus was numerically simulated until the refractory components, such as silicate rocks and organic matter were left behind as evaporative residues. Such a process represents the transformation from a comet to an asteroid. The spin-up related to the shrinking nucleus, associated with the water ice sublimation, was also calculated. The result of the calculation indicates that the cometary origin scenario can quantitatively account for all the features of Ryugu discussed above. We conclude that organic-rich spinning top-shaped rubble pile asteroids, such as Ryugu, are comet-asteroid transition objects or extinct comets.

Implementation of Terrestrial Survey for Plantation Land Suitability in Precet Forest Park, Sumbersuko Village, Wagir District, Malang Regency.

ABSTRAK- Penelitian ini merupakan penelitian dengan teknik pengambilan sampel berdasarkan kondisi gemorfologi wilayah dan observasi sebagai dasar pengukuran indentifikasi lapangan. Lokasi penelitian terletak pada Precet Forest park Desa Sumbersuko Kecamatan Wagir Kabupaten Malang. Hasil observasi dan survei lapangan, dalam penggunaan lahan di Precet Forest Park di dominasi oleh perkebunan campuran. Mengacu pada peta topografi dan hasil observasi lapangan penelitian ini bertujuan untuk menganalisis kesesuaian lahan perkebunan di Precet Forest Park Desa Sumbersuko Kecamatan Wagir, Kabupaten Malang. Analisis kesesuaian lahan diperlukan untuk menilai kesesuaian lahan pada lahan yang memungkinkan untuk suatu budidaya di Precet Forest Park. Berdasarkan hasil analisis menujukkan lokasi penelitian baik digunakan untuk pengembangan perkebunan, karena memiliki kondisi tanah dengan kandungan organik yang tinggi. Kata Kunci : Precet Forest Park, kesesuaian lahan, perkebunan. ABSTRACT- This research is a research with sampling techniques based on the condition of regional gemorfology and observation as the basis of field identification measurement.The research location is located in Precet Forest park Sumbersuko Village District Wagir Malang Regency.The results of observations and field surveys, in land use in Precet Forest Park are dominated by mixed plantations.Referring to the topographic map and field observation results this study aims to analyze the suitability of plantation land in Precet Forest Park Sumbersuko Village Wagir District, Malang Regency.Land suitability analysis is required to assess the suitability of land on land that allows for cultivation in Precet Forest Park.Based on the results of the analysis shows the research location is well used for plantation development, because it has soil conditions with a high organic content. Keywords : Precet Forest Park, land suitability, plantations.

Removal of organic matter from wastewater coming from fruit juice production using solar photo-Fenton process

The grape juice production generates an industrial wastewater that has a high concentration of organic matter and several polyphenols, such as ethanol. Therefore, the discharge of this wastewater can produce environmental problems. The aim of this work was to determine the optimal concentration of the reagents involved in a solar photo-Fenton process in the treatment of wastewater coming from juice. The process was analysed in a factorial design, as a function of H2O2 (900, 1000, 1100 mg/L) and Fe2+ (90, 100, 110 mg/L) concentration. The grape juice wastewater presents high organic content (20,500 mg/L COD and 5.4 mg/L polyphenols). Also, the presence of alcohols such ethanol, ethyl acetate and 2-metil-1-propanol was confirmed. The results showed that highest COD (>27%) and polyphenols removal (>36%) were obtained in experiments with 1100 mg H2O2/L and 100 mg Fe2+/L. In treatments with higher COD removal, 2-metil-1-propanol was detected as an intermediate of ethanol oxidation. These results proved that solar photo-Fenton is a suitable approach for treating the refractory organic matter from grape juice.

An Advanced Protocol for the Quantification of Marine Sediment Viruses via Flow Cytometry

Viruses are highly abundant, diverse, and active components of marine environments. Flow cytometry has helped to increase the understanding of their impact on shaping microbial communities and biogeochemical cycles in the pelagic zone. However, to date, flow cytometric quantification of sediment viruses is still hindered by interference from the sediment matrix. Here, we developed a protocol for the enumeration of marine sediment viruses by flow cytometry based on separation of viruses from sediment particles using a Nycodenz density gradient. Results indicated that there was sufficient removal of background interference to allow for flow cytometric quantification. Applying this new protocol to deep-sea and tidal-flat samples, viral abundances enumerated by flow cytometry correlated well (R2 = 0.899) with counts assessed by epifluorescence microscopy over several orders of magnitude from marine sediments of various compositions. Further optimization may be needed for sediments with low biomass or high organic content. Overall, the new protocol enables fast and accurate quantification of marine sediment viruses, and opens up the options for virus sorting, targeted viromics, and single-virus sequencing.

Efficiency of suspended solid removal from tofu production using Rotating Biological Contractor (RBC)

Tofu is a common food in Indonesia, made from soybean, and needs gigantic water for the process. The liquid waste of the tofu industry is usually directly discharged into the river without being processed. Liquid wastes of tofu have high organic content and become a problem in water pollution. Rotating Biological Contactor (RBC) is efficient method to treat waste with a high organic matter load by utilizing microorganisms to consume organic matter through biofilms. Biofilm will degrade organic matter aerobically. The purpose of the study is to determine the capability of RBC to reduce the organic content of tofu wastewater with different rotations of the disk. Rotation was experimentally varied from 30, 40, 50, 60 RPM and control. Results were considered in percentage decrease from the untreated waste: TSS of 87.56 ± 6.48%, BOD of 99.13 ± 0.21 %, and COD of 98.53 ± 0.08%. To conclude, the optimum rotation is 50 RPM for decreasing BOD and COD, otherwise 40 RPM for reducing TSS. The results effluent RBC on three parameters passed the quality standards legally for the soybean processing company or activity.

Perfluorooctanoic acid (PFOA) uptake by alfalfa (Medicago sativa) and bioavailability in Sprague-Dawley rats

Perfluorooctanoic acid (PFOA) is a perfluorinated alkyl substance (PFAS) used as surfactant in a wide variety of industrial and consumer products. Over the past decade, concern has increased over the presence of PFOA in biosolids from wastewater treatment plants used as fertilizer on agricultural lands having the potential to enter the food chain. In this study, the uptake of 14C-PFOA from soil by alfalfa was determined, as was the bioavailability of 14C-PFOA-incurred into alfalfa in Sprague-Dawley rats. Alfalfa leaves accumulated PFOA to as high as 4-5 µg/g of dry leaf, approximately 10 times higher than accumulation in the stem. Alfalfa was ground for feeding to 15 female Sprague-Dawley rats (175-200 g). Animals within metabolism cages were fed 10 g of feed (6 g alfalfa + 4 g ground rat chow) twice a day for 14 days (equivalent to 50 ug-PFOA/kg/day). At the end of the feeding period, rats (n=3) were sacrificed at withdrawal days of 0, 3, 7, 11, and 14 days. During the feeding and withdrawal phases, urine and feces were collected daily. At sacrifice, blood, liver, kidney, adipose, muscle, skin, brain, heart, adrenals, spleen, lungs, and thymus were removed and assayed for 14C-PFOA by combustion and LSC analysis. Rats eliminated 72.8 ± 3.4% of the total dose via urine at 14-days, but urinary radioactivity fell below the LOD by day 3 of the withdrawal period. Fecal elimination was 6.5 ± 1.2 % of the dose and fell below the LOD by 2 days of withdrawal. The rapid and high elimination via urine indicates that a majority of the dose was absorbed. The uptake of PFOA into alfalfa was low from a high organic content soil, however, PFOA was highly bioavailable from the alfalfa when used as a feed component for rats. This study provides data for regulators investigating PFOA bioavailability and disposition in animals or animal products exposed to contaminated feed.

Ozonation as a pre-treatment of landfill leachate

Ozone is an oxidizing agent with a potential for removing complex molecules, including those of difficult microbiological decomposition, such as the molecules found in landfill leachates. This effluent presents high organic content, including recalcitrant molecules. Therefore, this study evaluated the efficiency of ozonation in the treatment of raw leachate at the Primavera landfill, located in Mato Grosso, Brazil. The experiments were carried out using the batch system. The leachate pH value was set at 7 and 10, and the contact times between the gas and the leachate were 20, 40, 60, 80, and 100 minutes. Throughout the study, we analyzed color, turbidity, pH value, chemical oxygen demand (COD), and ultraviolet absorbance at 254 nm (UV abs) of the leachate, both before and after ozonation. Results show that ozonation presented high removal of color, COD and UV abs when pH was 7. In contrast, turbidity removal was higher when the pH value was 10. Regarding contact time, we observed a high removal of color (between 80% and 90%) and UV abs (between 60% and 70%) at 40 minutes, depending on the pH value. Removal was also high for turbidity (approximately 75%) starting at 20 minutes with the pH value at 10, and at 70 minutes with pH at 7. The removal relation within all analyzed parameters (due to ozone consumption) decreased throughout the reaction time. Thus, we concluded that ozonation as a pre-treatment of leachate is indeed satisfactory because of its great capacity for organic material removal.