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All Journal Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Cahya Widiyati
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Arts Chemical Engineering, Chemistry & Bioengineering Engineering Industrial & Manufacturing Engineering Social Sciences

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PEMANFAATAN ZEOLIT UNTUK PENURUNAN COD DAN BOD LIMBAH PENGOLAHAN KULIT Cahya Widiyati
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 12 No 2 (2013): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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Abstract

Leather is one of the semi-finished products that contribute to the export of non-oil commodities. In general, leather processing wastewater containing germs, dirty-colored, foul- smelling and containing COD, BOD5 and suspended solids are high. One of the adsorbent which has a large adsorption capacity is the natural zeolite. Natural zeolite adsorption capability increases when first activated zeolite. Zeolites can reduce pollutants in the form of cations and anions in wastewater so it can reduce COD and BOD5 waste leather processing. The purpose of this study to determine the effect of HCl concentration of activating zeolites and zeolite-activated heavy influence for BOD5 and COD reduction. The method used is laboratory-scale experiments. Activation 150 grams zeolite - 40 + 60 mesh by heating 2500C and the addition of 0.1 N HCl acid, 0.15 N, 0.2 N and 0.25 N. Zeolites are separated and dried in an oven. Weight activated zeolite 5 grams, 10 grams, 15 grams and 20grams. Mixing zeolite and 100 cc leather processing waste electrical stirrer 150 rpm for 30 minutes and then separated sediment. The filtrate was tested in COD and BOD5 waste leather processing. Do also test COD and BOD 5 without zeolite. COD tests using a COD reactor and BOD5 tests using Winkler method. The results showed that the zeolites were activated by heating 2500 C, 0.15 N HCl and weight of 20 grams of activated zeolite an optimum condition to reduce COD and BOD5 BOD5 decreased 96.67% to the value of 105 mg / l and COD reduction reached 92.23% with a value of 335.36 mg /l. Zeolite results of this study can be used for leather industry because zeolites are widely available in Indonesia and can to reduce levels BOD5 and COD leather processing waste.
DISPERSING AGENTS WASTEWATER QUALITY FROM LATEX GLOVES MANUFACTURING BY TREATMENT USING Al2(SO4)3 AND PAC COAGULANT Wahyu Ratnaningsih; Cahya Widiyati
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 22 No 2 (2023): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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Abstract

Waste is a residual result of a process that cannot be reused. The rubber industry is one of the waste-producing industries that if not managed properly, will cause environmental pollution. One of the rubber industries is the latex glove industry, which uses raw materials in the form of latex and chemicals as dispersing agents. Dispersing agents that already expired cannot be reused, so they need to be processed before being discharged into the environment. One of the methods used for treating this wastewater is the coagulation-flocculation method. This research is aimed to conduct the treatment of dispersing agents wastewater from latex glove manufacturing by the coagulation-flocculation method using coagulants to reduce the level of turbidity and COD concentration. The concentrations of Al2(SO4)3 and PAC coagulants used were 1.33 g/L, 1.67 g/L, and 2 g/L, respectively, with rapid stirring at 120 rpm for 2 minutes. The flocculant concentration used was 0.33 g/L, with rapid stirring at 25 rpm for 15 minutes. The results showed that Al2(SO4)3 coagulant was better at reducing turbidity levels up to 97.86% and COD concentrations up to 90.24% in the dispersing agents wastewater. Based on this study, the recommended dose of Al2(SO4)3 coagulant is 1.67 g/L. At this dose, there was a decrease in turbidity levels from 816 NTU to 17.43 NTU and a decrease in COD levels from 328 mg/L to 32 mg/L.
Co-Authors Wahyu Ratnaningsih