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Konversi
Published by Universitas Lambung Mangkurat
ISSN : 23023686     EISSN : 25413481     DOI : -
Core Subject : Education,
Education
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 9, No 1 (2020): April 2020" : 5 Documents clear
UTILIZATION OF CHITOSAN FROM SHRIMP SHELLS WASTE FOR REDUCTION IRON (Fe) METAL CONTENT IN MARTAPURA RIVER Hesti Wijayanti; Hijratul Wahdi; Winardi Nooryanto
Konversi Vol 9, No 1 (2020): April 2020
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v9i1.9073

Abstract

The Martapura River in South Kalimantan contains quite high levels of metals, namely Fe metal which allows the presence of excessive metal elements. According to KEPMENKES, clean water standards contain Fe of 0.3 mg/L. Based on testing, the Fe content contained in the Martapura River water was 2.8 mg/L. One effort to reduce the content of these metals is using adsorbents made from shrimp shells. This shrimp shell waste contains chitin, so if further treatment is given, it is expected to be used as an adsorbent to reduce Fe levels in the Martapura River.The study was conducted using shrimp shells with sizes of 1000 microns, 710 microns and 500 microns. This shrimp shell is deproteinized, the shrimp shell is added with a 3.5% NaOH solution (w/v). Then the demineralization process is carried out, where the dry residue obtained from the previous process is added with 1N HCl solution in a ratio of 1:15 (w/v). From this process chitin is produced, then chitin is deacetylized with 50% NaOH (w/v). Then the samples were tested with a DR-2500 spectrophotometer after being passed to a continuous adsorption device. From the results of the study, it was found that chitosan is very effective in reducing Fe metal content in the Martapura River, the quality of clean water produced reaches the clean water quality standards set. The results of the study at 500 microns size obtained the smallest Fe metal content of 0.05 mg/L.
EFFECT OF TEMPERATURE AND TIME ON DRYING OF RAW MATERIALS IN THE CASSAVA AND SWEET POTATO FLOUR PRODUCTION ON THE PHYSICAL AND CHEMICAL PROPERTIES Primata Mardina; Laila Amalia Sari; Erna Noerhayati
Konversi Vol 9, No 1 (2020): April 2020
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v9i1.9074

Abstract

This study aims to obtain the optimum temperature and time of raw materials drying in the manufacture of cassava and sweet potatoes flour, and studying the physical and chemical properties of cassava and sweet potatoes flour through a series of tests. Cassava and sweet potatoes as raw material are cut 1 mm thick and then dried with a temperature of 70, 85, 100oC, each drying time of 3 and 4 hours. Both materials are made into flour, then physical and chemical quality analysis is tested. The results showed that the optimum drying temperature and time of raw materials in making cassava and sweet potatoes flour were 70oC for 3 hours. The physical and chemical properties of the resulting flour are quite good overall and qualified samples are 70oC flour with 3 and 4 hours, and sweet potato with 3 hours and 85oC.
ADSORPTION OF Zn AND Pb METAL IN PRINTING WASTE OF PT. GRAFIKA WANGI KALIMANTAN USING CORN COBS CHARCOAL AS ADSORBENT Isna Syauqiah; Fajar Insan Kusuma; Mardiana Mardiana
Konversi Vol 9, No 1 (2020): April 2020
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v9i1.9075

Abstract

Heavy metals produced from several industrial processes cause many environmental problems. Efforts made to overcome this heavy metal pollution include adsorption methods. Agricultural by-products have the potential as an adsorbent, one of which is corn cobs. In this study, corncobs were used as Pb and Zn adsorbents. The purpose of this study was to determine the effect of particle size and stirring speed in the process of Zn and Pb metal absorption using activated charcoal. Adsorption was done by mixing 100 mL waste of PT. Grafika Wangi Kalimantan with 10 grams of activated charcoal measuring 355 micron, 500 micron and 710 micron. Each mixture is stirred for 15 minutes at speeds of 30, 60, 90, and 120 rpm and then allowed to stand for 3 hours. Analysis of the absorbed Zn and Pb metal content was carried out using a spectrophotometer at adjusted wavelengths. The greater the stirring speed, and the small size of the active charcoal particle used, decrease of Zn and Pb levels is increasing due to the better absorption of adsorbate by the adsorbent. The biggest decrease in Zn and Pb levels was seen at a stirring speed of 90 rpm and the active charcoal particle size of 355 microns where the Zn and Pb parameters contained in the sample were <0.01 mg / L.
REDUCTION OF MERCURY CONTENT IN LIQUID MEDIA BY ADSORPTION PROCESS USING COAL FLY ASH Doni Rahmat Wicakso; Maya Puspita Sari; Ni Luh Ratna A. K. D.
Konversi Vol 9, No 1 (2020): April 2020
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v9i1.9071

Abstract

Industrial and technological advancements have been able to improve the welfare of humanity, but present the consequences of environmental pollution which ultimately also affects human life. The well water used by residents as a necessity of life can be polluted due to gold mining because the gold mining is located not far from the residential area. The purpose of this study is to determine the levels of mercury in the liquid medium before and after the adsorption process, determine the ability of coal fly ash as an adsorbent in absorbing mercury in the liquid medium and determine the optimum contact times in mass variations of coal fly ash.Activation of coal fly ash was done by calcination for 2 hours, followed by measurement of initial concentration for liquid medium, the adsorption process is carried out with a coal fly ash mass variation of 4, 6, 8 and 10 g, and variations of adsorption time that is 10, 20, 30, 40 and 50 minutes. From the results of the study, obtained levels of mercury in the liquid medium before the adsorption process was carried out at 0.3263 ppm and after the adsorption process ranged from 0.2053 to 0.3023 ppm. Thus, coal fly ash has a low absorption ability to mercury in liquid medium and the best contact time where adsorption occurs for a mass of 6 g is at 10 minutes which is equal to 0.1210 ppm.
EFFECT OF TEMPERATURE AND CONCENTRATION OF NaOH SOLUTIONS AS INHIBITORS ON IRON CORROSION RATE IN WATER MEDIA Muthia Elma; Nurhalisah Nurhalisah; Afrisa Noor Hidayanti
Konversi Vol 9, No 1 (2020): April 2020
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v9i1.9072

Abstract

Corrosion is a chemical phenomenon that often occurs in iron materials that are exposed or immersed in a medium either liquid or air. As a result of this corrosion is fragility and damage to the object so that the object cannot function properly. The purpose of this research is to prevent or slow down the occurrence of corrosion by adding chemicals called corrosion inhibitors which work by forming a protective layer on the surface of objects in the form of metal or iron.In this study, inhibitors were used in the form of NaOH solution with variations in the concentration of 0.1; 0.5; 1; 1.25; 1,5; 5 and 10 N are dissolved in water media and the iron immersion process is carried out at temperatures of 40, 45, and 50 °C. Soaked iron bars are measured for surface area and volume as well as weighing before and after the immersion process so that the corrosion rate is obtained with various variables used. Based on the research results obtained corrosion rate increases with increasing temperature and the addition of NaOH concentration inhibitors. Optimal temperature and concentration to inhibit the rate of iron corrosion is at an immersion temperature of 45 ° C and a concentration of 0.1 N NaOH with a corrosion rate of 0.084875 mpy.

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