Penelitian ini bertujuan untuk memulihkan tanah yang terkontaminasi oleh minyak bumi melalui pencucian tanah atau soil washing. Tahap pencucian didahului dengan pengujian karakteristik tanah untuk mengetahui klasifikasi dari jenis tanah terkontaminasi tersebut, meliputi ukuran butiran, minyak lemak dan Total Petroleum Hydrocarbon (TPH). Proses soil washing dilakukan dalam skala laboratorium dengan menggunakan surfaktan Alkyl Benzena Sulfonate (ABS). Pengaruh konsentrasi surfaktan dan bulking agent terhadap penyisihan TPH dari tanah terkontaminasi diamati dengan memvariasikan rasio berat tanah terkontaminasi terhadap bulking agent (tanah silika) dalam satuan g/g yaitu dengan variasi perbandingan 50:50, 35:65 dan 25:75 dalam variasi larutan surfaktan 0%; 0,25%; 0,5%; 0,75% dan 1,0% (mL/mL). Hasil penelitian menunjukkan bahwa soil washing dipengaruhi oleh rasio bulking agent. Semakin tinggi rasio perbandingan bulking agen, semakin tinggi reduksi TPH. Reduksi TPH tertinggi didapatkan 92% pada perlakuan konsentrasi surfaktan 0,25% dan rasio tanah/bulking agent 25 : 75.
In this research, leather tanning using gambir processing liquid waste has been done. The research was done by varying the percentage of adding alum as mordant, respectively 0%, 2%, 4%, and 6% into the waste of gambier processing. The addition of alum crystal was done in step II of the tanning process. The observation was done by investigating several parameters, such as the skin color, physical and chemical properties of the tanned leather-based on SNI 06-0463. 1989 A. The results show that the use of alum crystal as a mordant made the skin color became yellowish, lower solubility of tannin in the water, smaller raw leather content, higher bonded tannin to the leather, higher tanning degree, higher tensile strength, and higher flexural strength. The alum crystal concentration affected the physical properties, i.e., tensile strength and flexural strength. Increasing the alum crystal concentration increases the tensile strength but decreases the tanned leather's flexural strength.
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