scholarly journals STUDI WATER MANAGEMENT PADA AREA PLANT PRODUKSI DI PT SEBUKU IRON LATERITIC ORES (SILO) SITE SUNGAI BALI, KECAMATAN SEBUKU, KABUPATEN KOTABARU, PROVINSI KALIMANTAN SELATAN

2021 ◽  
Vol 5 (3) ◽  
pp. 101
Author(s):  
Ary Rizki Novandy ◽  
Agus Triantoro ◽  
Romla Noor Hakim
Keyword(s):  
Water Management ◽  
Open Circuit ◽  
Magnetic Separator ◽  
Crushing Plant

PT Sebuku Iron Lateritic Ores memiliki 3 plant produksi untuk proses pengolahan dan pencucian bijih besi yaitu washing plant, crushing plant dan magnetic separator. Proses pengolahan tersebut menggunakan system open cicruit dan media air sebagai pencucian bijih besi, sumber air untuk kebutuhan proses produksi mengunakan air laut, air tampungan hujan dan air sirkulasi hasil dari proses pencucian bijih besi, air tersebut ditampung pada kolam endapan yang ada pada masing-masing plant dengan maksud mengurangi endapan lumpur sisa dari proses pencucian dan mengembalikan air dari proses tersebut untuk digunakan kembali. Tujuan dari penelitian  ini adalah menghitung persen endapan lumpur pada tiap kolam, menghitung debit air yang masuk dan keluar dari tiap kolam, menganalisa hambatan-hambatan yang terjadi, membuat simulasi pembagian kebutuhan air untuk kegiatan produksi, dan penjadwalan pengerukan kolam endapan untuk mencapai kebutuhan air sirkulasi secara maksimal.Perhitungan persen endapan lumpur pada kolam didapatkan dari hasil bottle rolling test, perhitungan pembagian kebutuhan air tambahan dari debit pompa kolam dan perhitungan debit limpasan sesuai curah hujan. Perhitungan jadwal pengerukkan kolam endapan didapatkan dari dimensi kolam dan kecepatan aliran kolam.Air yang masuk pada system open circuit sebesar 860,01 m³/jam dan air yang kembali tersirkulasi sebesar 310,49 m³/jam atau 43,9%. Jumlah endapan yang masuk ke kolam endapan WP sebesar 35% asumsi sampel 1 liter dari debit yang masuk dan 29,33% masuk ke kolam endapan MS. Kebutuhan air tambahan untuk kegiatan produksi dibutuhkan sebesar 396,64 m³/jam atau 56,1%. Jadwal pengerukkan kolam WP 2-3 hari sekali dan MS 1-15 hari sekali. Dengan simulasi rekomendasi kolam endapan baru agar air sirkulasi yang didapat maksimal maka target pengendapan menjadi 99% dan air sirkulasi dari pencucian meningkat menjadi 82% dan hanya membutuhkan air tambahan sebesar 18%. Jadwal pengendapan untuk kolam rekomendasi WP dan MS dapat dilakukan 3 hari sekali.  Kata-kata kunci: plant produksi, kolam pengendapan, system open circuit

Electrical Performance of PEM Fuel Cells With Different Gas Diffusion Layers

2011 ◽  
Vol 8 (4) ◽  
Author(s):  
P. Gallo Stampino ◽  
L. Omati ◽  
G. Dotelli
Keyword(s):  
Water Management ◽  
Fuel Cells ◽  
High Current Density ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Open Circuit ◽  
Electrical Performance ◽  
Carbon Paper ◽  
Carbon Cloth ◽  
Current Densities

The microporous layer (MPL) is a key component of polymer electrolyte membrane fuel cells (PEM-FCs), and it is in charge of the gas and water management at the electrode-gas diffusion layer (GDL) interfaces. A MPL was prepared and coated onto two different commercial GDLs: a carbon paper (woven-non-woven (WNW)) and a carbon cloth (CC). Electrical performances of the so-obtained gas diffusion media (GDM), i.e., GDL coated with the MPL, were investigated in single cell testing (steady-state polarization curves) using a Nafion® catalyst coated membrane with a platinum loading of 0.5 mg/cm2 both for the anode and the cathode. Moreover, in order to better understand the polarization phenomena during the running of the FC, impedance spectroscopy was carried out in galvanostatic mode at different current densities. In particular, the effect of the air relative humidity (RH 100%, 80%, and 60%) was investigated, while the hydrogen was fed always fully humidified (100%). The WNW substrate has demonstrated to be superior to CC in a vast range of current densities (from open circuit voltage to 0.8 A/cm2). However, at high current density, the WNW GDM has some problems in water management.

Closed or open circuit during ex-vivo lung perfusion for reconditioning of damaged donor-lungs – which shall we use?

2010 ◽  
Vol 58 (S 01) ◽  
Author(s):  
S Wipper ◽  
Y von Rittberg ◽  
J Lindner ◽  
C Pahrmann ◽  
H Reichenspurner ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Open Circuit ◽  
Lung Perfusion ◽  
Ex Vivo Lung Perfusion

New advanced designed systems to ensure safeguard of the territory and preservation of water resources for irrigation

2020 ◽  
pp. 1-19
Author(s):  
Cinalberto Bertozzi ◽  
Fabio Paglione
Keyword(s):  
Water Management ◽  
Water Resources ◽  
Drainage Basin ◽  
Land Reclamation ◽  
Land Area ◽  
Water Board ◽  
Management Schemes ◽  
Innovative Techniques ◽  
River Po ◽  
Crop Irrigation

The Burana Land-Reclamation Board is an interregional water board operating in three regions and five provinces. The Burana Land-Reclamation Board operates over a land area of about 250,000 hectares between the Rivers Secchia, Panaro and Samoggia, which forms the drainage basin of the River Panaroand part of the Burana-Po di Volano, from the Tuscan-Emilian Apennines to the River Po. Its main tasks are the conservation and safeguarding of the territory, with particular attention to water resources and how they are used, ensuring rainwater drainage from urban centres, avoiding flooding but ensuringwater supply for crop irrigation in the summer to combat drought. Since the last century the Burana Land-Reclamation Board has been using innovative techniques in the planning of water management schemes designed to achieve the above aims, improving the management of water resources while keeping a constant eye on protection of the environment.

“And the Earth Was Still Moving…” The Massacre of Jews in Szczeglacin in Eyewitness’ Testimonies

2010 ◽  
pp. 451-465
Author(s):  
Marta Woźniak
Keyword(s):  
Water Management ◽  
Labor Camp ◽  
The Earth ◽  
The Village

The article deals with a labor camp for Jews founded by the Germans in Cerkwisko near Bartków Nowy, Karczew Commune, was transferred to the village of Szczeglacin due to the works’ advancement along the river. The Jews who died in that camp performed work connected with water management which consisted in draining the farmland and engineering the Kołodziejka River a Bug tributary. The liquidation of the Szczeglacin camp probably took place in the morning of 22 October 1942.  Several hundred Jews were killed with a primitive tool – a wooden club. According to the witnesses, “when spring came,” probably of 1944, the Germans returned to the spot to conduct an exhumation of the remains in order to ultimately cover the traces. The article is based on various sources – from oral accounts, collected in 2009 in Szczeglacin and the neighboring villages, through records produced in 1947  (Josek Kopyto’s testimony) and 1994e manuscript of a peasant from Bartków Stary as well as regional publications

Corrosion monitoring and root cause identification in high solids concentrators

TAPPI Journal ◽  
2016 ◽  
Vol 15 (7) ◽  
pp. 467-477
Author(s):  
PASI NIEMELAINEN ◽  
MARTTI PULLIAINEN ◽  
JARMO KAHALA ◽  
SAMPO LUUKKAINEN
Keyword(s):  
Paper Industry ◽  
Black Liquor ◽  
Construction Materials ◽  
Open Circuit ◽  
Process Conditions ◽  
Potential Range ◽  
Corrosion Monitoring ◽  
General Corrosion ◽  
High Solids ◽  
Passive Area

Black liquor high solids (about 80%) concentrators have often been found to suffer from aggressive corrosion. In particular, the first and second effect bodies are susceptible to corrosion attacks resulting in tube leaks and wall thinning, which limit the availability and lifetime of evaporator lines. Corrosion dynamics and construction materials have been studied extensively within the pulp and paper industry to understand the corrosion process. However, it has been challenging to identify root causes for corrosion, which has limited proactive measures to minimize corrosion damage. Corrosion of the first phase concentrator was studied by defining the potential regions for passive area, stress corrosion cracking, pitting corrosion, and general corrosion. This was achieved by using a technique called polarization scan that reveals ranges for the passive area in which the equipment is naturally protected against corrosion. The open circuit potential, also known as corrosion potential, and linear polarization resistance of the metal were monitored online, which allowed for definition of corrosion risks for stainless steel 304L and duplex stainless steels 2205 and SAF 2906. An online temperature measurement added insight to the analysis. A process diagnostics tool was used to identify root causes of the corrosion attacks. Many of the root causes were related to process conditions triggering corrosion. Once the metal surface was activated, it was difficult to repassivate the metal naturally unless a sufficient potential range was reached.

Optimization of a well system using the Ground Water Management package of MODFLOW-2000

2016 ◽  
Vol 39 ◽  
pp. 101-104 ◽  
Author(s):  
Anna Grava ◽  
Marco Rotiroti ◽  
Letizia Fumagalli ◽  
Tullia Bonomi
Keyword(s):  
Water Management ◽  
Ground Water
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