Kajian reduksi Cr(VI) pada lumpur kering limbah penyamakan kulit

Abstract

Lumpur kering lirnbah penyarnakan kulit (LKLPK) rnengandung hara makro dan hara mikro dalam jumlah yang cukup tinggi. tetapi disisi lain juga mengandung bahan cemaran berupa logam berat krom dan garam. Kandungan krom total LKLPK dapat mencapai 3-7% bahan kering, sehingga sangat membatasi penggunaannya sebagai pembenah tanah atau pupuk organik. Cr(VI) dikenal sangat toksik dan karsinogenik bagi ternak dan manusia.

Sludge of leather tanning waste contains micronutrients and macronutrients in large quantiy, on the other hand, it also contains chromium heavy metal. Chromium content of the sludge is about 3-7% of dry matter, so that they limited the use of this sludge as soil conditioner and organic fertilizer. Cr(VI) was very toxic, carcinogenic and mutagenic for most organism. Cr(VI) could be reduced by bacteria, fungi, yeast and algae (Gadd, 1992). The main objective of this research was to study the chemical tranformation of Cr(VI) in the sludge by fungal and bacterial activity through composting process and biomethanogenesis.