scholarly journals Continuously Dynamic Mixing (CDM) Method and Greenhouse Salt Tunnel (GST) Technology for Sea Salt Production throughout the Year [Metode Continuously Dynamic Mixing (CDM) dan Teknologi Greenhouse Salt Tunnel (GST) Untuk Produksi Garam Sepanjang Tahun]

2019 ◽  
Vol 11 (2) ◽  
pp. 82
Author(s):  
Andi Kurniawan ◽  
Muhammad Imam Syafi’i ◽  
Gatot Ardian ◽  
Abdul Aziz Jaziri ◽  
Abd. Aziz Amin ◽  
...  
Keyword(s):  
Rainy Season ◽  
Evaporation Rate ◽  
Environmental Parameters ◽  
Sea Salt ◽  
Salt Crystallization ◽  
Salt Production ◽  
Mixing Method ◽  
Original Innovation ◽  
Optimum Water

AbstractOne of the biggest challenges in sea salt production is unpredictable and unsuitable weather. Sea salt production process is very depended on the evaporation rate of sea salt production and it will be stopped in the rainy season. One of the alternative strategies to solve this problem is the application of greenhouse salt crystallization in sea salt production. This study aims to develop the technology to produce sea salt in the rainy season by applying Continuously Dynamic Mixing Method (CDM) in the Greenhouse Sea Salt Tunnel (GST). The application of CDM in the GST is an original innovation developed by the researchers of this study. Environmental parameters analyzed in the present study were daily temperatures, wind speed, evaporation rate, humidity, and Baumé scale value. The quality of the produced sea salt was evaluated from the water and NaCl content. The results of this study indicate that the application of the CDM method in GST makes the sea salt production from the raw water materials (± 2° Be) can be conducted in the rainy season. The optimum water and NaCl content of the produced sea salt is 98.05 % and 7 %, respectively. The production of sea salt for one cycle (15 days) in this study is 300 kg/GST-Crystallization (44 m2). According to the results, the CDM method in the GST technology may improve the production of the sea salt in the rainy season and allow it to produce sea salt throughout the year.AbstrakSalah satu tantangan terbesar dalam produksi garam adalah kondisi cuaca yang tidak menentu ataupun tidak mendukung proses pengkristalan garam. Proses pembuatan garam yang sangat tergantung pada laju evaporasi membuat produksi garam akan berhenti pada musim hujan. Strategi pengoptimalan laju evaporasi dengan menggunakan rumah kristalisasi garam berkembang menjadi salah satu alternatif metode untuk mengatasi permasalahan tersebut. Studi ini bertujuan untuk mengembangkan teknologi produksi garam di musim hujan dengan menerapkan metode Continuously Dynamic Mixing (CDM) pada rumah kristalisasi berbentuk Greenhouse Salt Tunnel (GST). Penerapan metode CDM dalam teknologi GST merupakan inovasi teknologi yang dikembangkan khusus oleh peneliti dalam studi ini. Parameter lingkungan yang diteliti terdiri dari suhu harian (air dan udara), kecepatan angin, laju penguapan, kelembaban udara dan nilai skala Baumé dari air bahan baku garam. Kualitas produksi garam dievaluasi berdasarkan kandungan air dan kandungan NaCl. Hasil penelitian ini mengindikasikan kalau penerapan metode CDM pada GST membuat produksi garam yang dimulai dari air muda (± 2° Be) dapat dilakukan pada musim hujan. Garam yang dihasilkan berwarna putih dengan kandungan NaCl dan kadar air, secara berturut-turut, adalah 98.05 % dan 7 %. Hasil produksi garam per siklus produksi dalam musim hujan (15 hari) sebesar 300 kg/GST-Kristalisasi (luasan 44 m2). Berdasarkan hasil penelitian, metode CDM pada teknologi GST membuat produksi garam pada musim hujan sehingga produksi garam dapat dilakukan sepanjang tahun.

Produksi MgCl2 dari Bittern melalui Optimalisasi Pemisahan Ion Sulfat Menggunakan Reagen Kalsium Klorida Dihidrat

2021 ◽  
Vol 10 (2) ◽  
pp. 243-251
Author(s):  
Wiwit Sri Werdi Pratiwi ◽  
Nike Ika Nuzula ◽  
Desi Suryana Suci ◽  
Ary Giri Dwi Kartika ◽  
Makhfud Effendy
Keyword(s):  
Magnesium Chloride ◽  
Basic Research ◽  
Raw Material ◽  
Molar Ratio ◽  
Salt Crystallization ◽  
Sulfate Content ◽  
Sulfate Ions ◽  
Chloride Dihydrate ◽  
Salt Production

Madura memberikan kontribusi terbesar terhadap produksi garam di Jawa Timur. Produksi garam menghasilkan limbah yang disebut bittern. Bittern merupakan air sisa kristalisasi garam yang berbentuk cairan dengan kadar kepekatan >29o Be dan memiliki kandungan utama berupa ion magnesium. Selama ini, hasil bittern dari tambak garam rakyat Kabupaten Pamekasan, Madura digunakan kembali untuk proses produksi garam, dimana kegiatan tersebut dapat menurunkan kualitas garam. Dalam skala industri, bittern dapat digunakan sebagai bahan baku magnesium, namun diperlukan suatu metode untuk memisahkan senyawa lainnya agar tidak mengganggu proses ekstraksi magnesium. Ion sulfat (SO₄²ˉ) merupakan ion terbanyak kedua yang terkandung dalam bittern, sehingga pemisahan ion sulfat merupakan suatu strategi untuk meningkatkan kualitas bittern sebagai bahan baku magnesium klorida. Pada penelitian ini, proses pemisahan ion sulfat menggunakan reagen kalsium klorida dihidrat (CaCl₂.2H₂O) yang ditambahkan pada bittern dengan perbandingan antara SO₄²ˉ dan CaCl₂.2H₂O yaitu P1 = 1:0,90 ; P2= 1:0,95; P3 1:1; P4=1:1,05; dan P5= 1:1,1. Berdasarkan hasil penelitian, dapat disimpulkan bahwa kandungan sulfat pada bittern yaitu 41257,14±757,14 mg/L. Kadar sulfat pada filtrat dengan perlakuan P₁ = 4,14±0,43 mg/L; P₂ = 5,38±0,22 mg/L; P₃ = 7,57±1,14 mg/L; P₄ = 6,57±0,57 mg/L; dan P₅ = 7,48±0,46 mg/L. Penambahan CaCl₂.2H₂O berpengaruh terhadap kadar sulfat pada bittern yang dapat dilihat dari hasil uji ANOVA.  Perlakuan optimal dari uji lanjut DNMR yaitu pada perlakuan ratio molar 1:0,9 dengan nilai rata-rata 4,1429 mg/L dimana dilihat dari rata-rata paling kecil dari perlakuan lainnya. Hasil penelitian ini menjadi penelitian dasar untuk melakukan optimasi ekstrak magnesium klorida dari bahan baku bittern. Madura provides the largest contribution to salt production in East Java. Salt production generates a waste called bittern. Bittern is the residual liquid of salt crystallization with a concentration of 29oBe and has the main content of magnesium ions. Unfortunately, bittern from the salt pond in Pamekasan Regency, Madura is reused for the salt production process, whereby this activity can reduce the quality of salt. On an industrial scale, bittern can be used as a raw material for magnesium, but a method is needed to separate other compounds so it does not interfere with the magnesium extraction process. Sulfate ion (SO₄²ˉ) is the second most abundant ion contained in bittern. Thus, the separation of sulfate ions is a strategy to improve the quality of bittern as a raw material for magnesium chloride. In this study, the separation process of sulfate ions using calcium chloride dihydrate reagent (CaCl₂.2H₂O) added to bittern with a ratio between SO₄²ˉ and CaCl₂.2H₂O, namely P1 = 1:0,90; P2= 1:0,95; P3 1:1; P4=1:1,05; dan P5= 1:1,1. Based on the research results, it can be concluded that the sulfate content in bittern is 41257.14 ± 757.14mg/L. Sulfate levels in the filtrate  were P₁ = 4.14±0.43 mg/L; P₂ = 5.38±0.22 mg/L; P₃ = 7.57±1.14mg/L; P₄ = 6.57±0.57mg/L; and P₅ = 7.48±0.46 mg/L.The addition of CaCl₂.2H₂O has an effect on the sulfate content of bittern which can be exhibited from the ANOVA test results. The optimal treatment of the DNMR test is the treatment of the molar ratio of 1: 0.9 with an average value of 4.1429 mg/L, which is referred from the smallest average of other treatments. The results of this study serve as basic research to optimize the extract of magnesium chloride from bittern as raw material.

МЕТОД ГЛУБОКОГО ОБУЧЕНИЯ С ПОДКРЕПЛЕНИЕМ ДЛЯ СИСТЕМ ИНТЕРНЕТА ВЕЩЕЙ НА БАЗЕ ТЕХНОЛОГИИ LORA С ОГРАНИЧЕННЫМИ РЕСУРСАМИ И ПОДДЕРЖКОЙ QoS

2021 ◽  
Author(s):  
 M.S. MUTHANNA ◽  
A.S. MUTHANNA ◽  
 A.S. BORODIN
Keyword(s):  
Data Transmission ◽  
Environmental Parameters ◽  
Code Rate ◽  
Frame Structure ◽  
Signal Quality ◽  
High Quality ◽  
Spreading Factor ◽  
Transmission Parameters ◽  
Factor Code

Achieving high Quality of Service (QoS) remains a challenge for LoRa technology. However, high QoS can be achieved via optimizing the transmission policy parameters such as bandwidth and code rate. Existing approaches do not provide an opportunity to optimize the LoRa networks' data transmission parameters. The article proposes transmission policy enforcementfor QoS-aware LoRanetworks.The QoSparameter ranking is implemented for IoT nodes where priority and nonpriority information is identified by the new field of LoRa frame structure(QRank).The optimaltransmissionpolicyenforcement uses fast deep reinforcement learning that utilizes the environmental parameters including QRank, signal quality, and signal-to-interference-plus-noise-ratio. The transmission policy is optimized for spreading factor, code rate, bandwidth, and carrier frequency. Performance evaluation is implemented using an NS3.26 LoRaWAN module. The performance is examined for various metrics such as delay and throughput. Достижение высокого качества обслуживания (QoS) по-прежнему остается достаточно сложной задачей для технологии LoRa. В принципе высокий уровень QoS может быть достигнут за счет оптимизации параметров передачи, например, пропускной способности и скорости передачи информации в сети. Известные на сегодняшний день решения не дают возможности оптимизировать параметры передачи данных для сетей LoRa. В статье предложен эффективный метод передачи данных, обеспечивающий требования по QoS при использовании технологии LoRa. Ранжирование параметров QoS для узлов интернета вещей определяется новым полем структуры фрейма LoRa (QRank) для приоритетной и неприоритетной информации. Для обеспечения эффективной передачи применяется быстрое глубокое обучение с подкреплением, для которого используются как параметры качества обслуживания, так и отношение сигнал/шум. Метод передачи оптимизирован с учетом коэффициента распространения, скорости передачи данных, полосы пропускания и несущей частоты. Оценка производительности при применении предложенного метода проведена с использованием модуля LoRaWAN в пакете имитационного моделирования NS3.26. Производительность оценивается на основе параметров задержки и пропускной способности.

Water Quality From Gualaxo Do Norte And Carmo Rivers (Minas Gerais, Brazil) After The Fundão Dam Failure

2021 ◽  
Vol 44 ◽  
Author(s):  
Leonardo Brandão Nogueira ◽  
Sabriny Melo Sousa ◽  
Camila Gonçalves Lobo Santos ◽  
Gustavo Simões Araújo ◽  
Laser Oliveira ◽  
...  
Keyword(s):  
Water Quality ◽  
Trace Elements ◽  
Rainy Season ◽  
Aquatic Ecosystems ◽  
Dam Failure ◽  
Subsistence Farming ◽  
Environmental Disaster ◽  
Uncertain Future ◽  
Toxic Potential

Mining waste is rich in trace elements, which present a high toxic potential and may represent a risk for aquatic ecosystems. The Fundão dam failure, considered the largest environmental disaster in the world, affected 663.2 km of watercourses, including Carmo and Gualaxo do Norte Rivers. The ore tail also affected the riverside communities, destroying villages, killing people and affecting the subsistence farming. To evaluate the influence of the mine tailing wave on the water quality of the Carmo and Gualaxo do Norte Rivers water samples were collected at nine points located in Barra Longa during the rainy season. Physicochemical parameters (conductivity, resistivity, EH, total dissolved solids, pH and temperature) and major, minor and trace elements concentrations (Ba, Co, Cr, Cu, Ni, Sc, Sr, V, Zn, As, Pb, Al, Fe, Mn, Ca, K, Mg and P) were evaluated and compared with previous studies and conformity limits established by a national resolution (CONAMA Resolution N°357/2005). Only conductivity, Fe and Mn presented non-conformity values according to CONAMA Resolution N°357/2005. These results may be related not only to the dam burst but also to the rainy season and non-detectable pollution sources. Furthermore, the decreased levels in the toxic elements in the rivers over time, may be related to its association with sediments in addition to their flux to the Atlantic Ocean. Thus, after nearly six years, the environmental and social impacts are still alive and the minerals dragged to the riverbed could bring cumulative effects for the entire environment what means an uncertain future to the Rio Doce Basin and adjacent coastal zone.

scholarly journals Description of the larva of Bromeliagrion rehni (Odonata: Coenagrionidae) with bionomic notes concerning its phytotelmic habitat in central Amazonas, Brazil

2008 ◽  
Vol 25 (3) ◽  
pp. 479-486 ◽  
Author(s):  
Sharlene R. da S. Torreias ◽  
Ulisses G. Neiss ◽  
Neusa Hamada ◽  
Ruth L. Ferreira-Keppler ◽  
Frederico A.A. Lencioni
Keyword(s):  
Rainy Season ◽  
Environmental Parameters ◽  
Dry Season ◽  
Stage Larva ◽  
Water Volume ◽  
Apical Region ◽  
Last Stage ◽  
First Time ◽  
The Relationship

The last-stage larva of Bromeliagrion rehni Garrison in De Marmels & Garrison, 2005 is described and illustrated and bionomics and habitat information on this species are provided. The study was conducted in the Reserva Florestal Adolpho Ducke, located near Manaus, state of Amazonas, Brazil.Twelve samplings were done between April, 2003 and April, 2005: six in the rainy season and six in the dry season. In each sampling month, 12 bromeliads (Guzmania brasiliensis Ule, 1907, Bromeliaceae) were collected, six of which were terrestrial and six epiphytic, yielding144 samples. A total of 75 specimens of B. rehni were collected. The relationship between larval B. rehni abundance and the measured environmental parameters (volume (ml), pH, season and stratum) was significant (ANCOVA, F = 5.296, d.f. = 130, p < 0.001). Larvae were most abundant in the rainy season (p < 0.01) and water volume was positively related to the abundance of B. rehni. Larvae of B. rehni can be distinguished from those of B. fernandezianum (the only species in the genus with described larvae) by the number of setae in the prementum and by the color of the apical region of the femur. The association of this species with phytotelmata of G. brasiliensis is reported here for the first time.

Quality Improvement of Recycled Aggregate Concrete

2006 ◽  
Vol 302-303 ◽  
pp. 308-313 ◽  
Author(s):  
Vivian W.Y. Tam ◽  
X.F. Gao ◽  
C.M. Tam
Keyword(s):  
Compressive Strength ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Two Stage ◽  
New Approach ◽  
Aggregate Concrete ◽  
Strength Based ◽  
Mixing Method ◽  
Strength Variability

The developments of recycled aggregate concrete pressing hard in construction activities; however, the limitations on their applications had never being ended. The focus of this paper is: i) investigating the waste management strategy in construction; ii) proposing the two-stage mixing approach (TSMA) to improve the quality of RAC; and iii) experimenting the TSMA and assessing the benefits possibly gained. It proposes a new approach in mixing concrete, namely, the two-stage mixing method, to improve compressive strength of RAC and lower its strength variability. The replacement ratio from zero to thirty is under experiment on their compressive strength. Based upon the experimental results, improvements of 31 % in strength at 28 days with 30 % RA substitute was achieved. The effect can be attributably to the porous nature of the RA and the pre-mix process which can make some pores filled up resulting in a denser concrete and thus leading to higher strength when compared with the traditional mixing approach. Therefore, two-stage mixing approach can open up a wider application of recycled aggregate concrete.

scholarly journals Ambient Air Quality Assessment with Particular Reference to Particulates in Western part of Jharia Coalfield, India

2015 ◽  
Vol 10 (2) ◽  
pp. 523-528 ◽  
Author(s):  
Gurdeep Singh ◽  
Amarjeet Singh
Keyword(s):  
Air Quality ◽  
Power Plants ◽  
Environmental Parameters ◽  
Ambient Air ◽  
Primary Energy ◽  
Underground Mines ◽  
Opencast Mining ◽  
Ambient Air Quality ◽  
Jharia Coalfield

India is in the list of fastest growing countries of the world. India's energy needs are also increasing due to population and industrial growth for improving quality of living style. In India, coal is major input infrastructure industries for example Power plants, Steel plants and Cement industries. India’s 52% of primary energy is coal dependent1. 66% of India's power generation depends upon coal production1. Jharia Coalfield (JCF) is falling in the Lower Gondwana Coalfields of India. The area of the JCF is about 450 km2. It is important for the major supply of precious coking coal required for steel plants in India. It is located in Dhanbad district of Jharkhand state of India, The latitude is 23° 39' to 23° 48' N and longitude is 86° 11' to 86° 27' E for the Jharia coalfield. Based on environmental parameters, all the 103 mines of BCCL have been grouped under 17 Clusters. A cluster consists of a group of mines with mine lease boundary lying in close vicinity and includes-Operating mines, Abandoned/ closed mines and proposed projects.The focused study area is in the western part of the Jharia coalfield is named as Cluster XV group of mines of BCCL consists of four mines, Kharkharee Colliery (UG), Dharmaband Colliery (UG), Madhuband Colliery (UG) and Phularitand Colliery (UG) .The present study was carried out with the objective to measure the ambient air quality of the study area with reference to particulate matter (SPM, PM10 & PM2.5). Ambient air monitoring results have shown that the observe air quality were found within the limit prescribed by MoEF / CPCB. It may due to Underground mines as there are pollution causing lesser activities involved in the UG mining process compared to opencast mining. Implementation of Master plan for Jharia coalfields for environmental management has also improve the air quality in the area10,11.

scholarly journals Impact of treated sewage on meiobenthic nematodes: a case study from the Tunisian Refining Industries Company

2022 ◽  
Vol 82 ◽  
Author(s):  
A. Hedfi ◽  
M. Ben Ali ◽  
A. Noureldeen ◽  
H. Darwish ◽  
T. Saif ◽  
...  
Keyword(s):  
Organic Matter ◽  
Environmental Parameters ◽  
The Other ◽  
Treated Sewage ◽  
Before And After ◽  
Bizerte Bay ◽  
De Man ◽  
The Impact

Abstract The main objective of the current study was to assess the impact of the water taken from the ‘Tunisian Refining Industries Company’ on meiobenthic nematodes, before and after a series of treatments in decantation basins followed by its discharge in Bizerte bay, Tunisia. The comparison of environmental parameters of the two types of water was clearly indicative of an improvement in the quality of treated waters after a significant reduction in their loads in hydrocarbons. Overall, the water retained a good quality after being treated by ‘Tunisian Refining Industries Company’ before discharge in the sea. At the end of the experiment, differential responses were observed according to the richness of sediment in organic matter and hydrocarbons. Thus, it was apparent that the nematode assemblage exposed to the treated waters was closer to controls and associated to higher values of abundance, than that under untreated ones. It was also assumed that the species Microlaimus honestus De Man, 1922, Paramonohystera proteus Wieser, 1956 and Cyartonema germanicum Juario, 1972 are sensitive bioindicators of bad environmental statues and of hydrocarbon presence in the environment. On the other hand, Metoncholaimus pristiurus (Zur Strassen, 1894) Filipjev, 1918 would rather be classified as a positive bioindicative species of this type of pollutants.

scholarly journals Peningkatan Kualitas Produksi Garam Menggunakan Teknologi Geomembran

2019 ◽  
Vol 6 (2) ◽  
pp. 71-76
Author(s):  
Yuliana Ulfidatul Hoiriyah
Keyword(s):  
Qualitative Research ◽  
Data Collection ◽  
Sampling Method ◽  
Daily Life ◽  
Sampling Technique ◽  
Salt Production ◽  
Interview Session ◽  
Industrial Needs ◽  
The Village

Salt is a very important commodity in daily life, both for food and industrial needs. Therefore, increasing salt production is very necessary to meet domestic salt needs. One of the most salt producing regions is Madura Island, because almost every district, especially Pamekasan, Lembung, Kec. Galis, the majority of the population work as salt farmers. The purpose of this research is to find out about improving the quality of salt production in Lembung, Kec. Pamekasan Regency, Madura, East Java Province. using Geomembrane Technology. This research is a descriptive qualitative research. The sample of this research is a resident who works as a salt farmer in the village of Lembung, Galis Regency, Pamekasan Regency, East Java, this sampling technique uses the Purposive Sampling method, data collection is done through interview session techniques, and documentation. Based on this research, it can be concluded that the increase in the quality of salt production can be done by using geomembrane technology which significantly influences the quality and quantity of production.

scholarly journals ORGANIC COMPOUNDS AS PROXIES OF THE SEDIMENTARY ENVIRONMENTAL QUALITY OF THE MARICÁ-GUARAPINA LAGOON SYSTEM (SE, BRAZIL)

2019 ◽  
Vol 4 (2) ◽  
pp. 159-173 ◽  
Author(s):  
Lazaro Laut ◽  
Maria Virgina Alves Martins ◽  
Pierre Belart ◽  
Maria Lucia Lorini ◽  
Iara Clemente ◽  
...  
Keyword(s):  
Organic Matter ◽  
Rio De Janeiro ◽  
Sedimentary Environment ◽  
Environmental Parameters ◽  
Geochemical Data ◽  
Fine Grained ◽  
Lagoon System ◽  
Se Brazil ◽  
Anthropogenic Contribution

Bottom sediment is a natural trap for organic matter and different kinds of pollutants. The accumulation of large amount of organic matter gives rise to the eutrophication of the aquatic ecosystems. The analyses of the quantity and quality of the organic matter (biopolymers) help to determine the trophic status of coastal ecosystems. The Maricá-Guarapina Lagoon System (MGLS) is located in Rio de Janeiro and is composed by four connected lagoons: Maricá, Barra, Padre and Guarapina. It has been suffering impacts due to the intense and uncontrolled property speculation. Based on this problem, this study aimed to characterize the organic matter (OM) amount and quality in sediments and the relation with the impacted areas in this lagoon system. The collected sediment samples were analyzed for geochemical data combined with grain size and physical-chemical environmental parameters of the bottom water. Statistical results evidenced that the sedimentary environment of the MGLS is heterogenous. The organic matter supplied to the MGLS is provided from different sources but the autochthonous contribution (phytoplanktonic productivity and vegetal detritus from the mangrove fringe) prevails. The anthropogenic contribution was more evident in Padre Lagoon, where the sediments had relatively low TOC contents (0.1-0.8%). The MGLS is accumulating mainly aged organic matter. The most impacted zones were found in Guarapina, Barra and Maricá lagoons, in bottoms of fine-grained sediments, with relatively high TOC and labile biopolymeric compounds (proteins, carbohydrates and lipids) contents, which should evolve into an ever-increasing stage of eutrophication. COMPOSTOS ORGÂNICOS USADOS COMO INDICADORES DA QUALIDADE AMBIENTAL SEDIMENTAR DO SISTEMA LAGUNAR MARICÁ-GUARAPINA (SE DO BRASIL)ResumoO sedimento de fundo constitui uma armadilha natural para a matéria orgânica e diferentes tipos de poluentes. O acúmulo de grande quantidade de matéria orgânica dá origem à eutrofização dos ecossistemas aquáticos. Estimativas de quantidade e qualidade da matéria orgânica (biopolímeros) podem ajudar a determinar o estado trófico dos ecossistemas costeiros. O Sistema Lagunar de Maricá-Guarapina (MGLS), localizado no Estado do Rio de Janeiro (SE do Brasil), é composto por quatro lagunas interconectadas: Maricá, Barra, Padre e Guarapina. Este sistema tem sofrido impactos devido à intensa e descontrolada especulação imobiliária. Neste contexto, este estudo teve como objetivo caracterizar a quantidade e qualidade de matéria orgânica (MO) dos sedimentos do MGLS. Foram obtidos dados geoquímicos e confrontados com resultados granulométricos em amostras de sedimentos coletados em 22 estações de amostragem e analisados parâmetros físico-químicos da água. Os resultados estatísticos evidenciaram que o ambiente sedimentar do MGLS é heterogêneo. Este sistema recebe matéria orgânica de diferentes fontes, sendo, porém, prevalecente a contribuição autóctone (produtividade fitoplanctônica e detritos vegetais dos manguezais existentes na região). A contribuição antropogênica de matéria orgânica foi mais evidente na Lagoa do Padre, onde os sedimentos apresentaram teores de COT relativamente baixos (0,1-0,8%). As zonas mais impactadas foram encontradas em fundos de sedimentos finos, com teores relativamente elevados de COT e de compostos biopoliméricos lábeis (proteínas, carboidratos e lipídios), nas lagunas de Guarapina, Barra e Maricá. Os resultados obtidos revelam também que o MGLS está acumulando principalmente matéria orgânica envelhecida e permitem prever que as referidas áreas podem evoluir para um estágio de cada vez maior grau de eutrofização.Palavras-chave: Lagunas Costeiras Tropicais. Biopolímeros. Eutrofização. Dinâmica Sedimentar.

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