Abstract
The aims of research was to study the effect of contaminated soil with tannery industrial wastesludge, and absorption level of chromium by the green mustard. The experiment was carried out in Kayen, Sleman, Yogyakarta for 3 months. The form of a pot experiment using a full factorial design 2x3 and 2 additional treatments as a control was set out in Completely Randomized Design (CRD), using 15 units of pots as replicates. The first factor consists of two varieties of mustard, which is kailan (chinesse kale) and spoon mustard greens (pak choy green). The second factor consists of 3 doses of leather tanning industry waste, i.e 500 mg chromium/kg soil, 1000 mg chromium/kg soil, 1500 mg chromium/kg soil. Control treatment was the planting of two varieties of mustard without the addition of sewage sludge. Preparation of sewage sludge was carried out by mixing the sewage sludge into the planting medium consisting of a mixture of soil, compost and manure treatments in accordance with the treatment. Observations made by harvesting the plants at the age of 3 and 6 weeks after planting for the next shoots and roots of plants and chromium content of growing media was analyzed. The results showed that the accumulation of chromium in the roots of plants was greater than in the plant canopy for the two types of mustards either good harvested at the age of 3 or 6 weeks after planting, and the content of chromium in plant tissues of mustard as part of vegetable that generally consumed exceeds the threshold of human daily consumption (0,035 mg/kg daily consumption).
Highlights
The aims of research was to study the effect of contaminated soil with tannery industrial wastesludge, and absorption level of chromium by the green mustard
The results showed that the accumulation of chromium in the roots of plants was greater than in the plant canopy for the two types of mustards either good harvested at the age of 3 or 6 weeks after planting, and the content of chromium in plant tissues of mustard as part of vegetable that generally consumed exceeds the threshold of human daily consumption (0,035 mg/kg daily consumption)
4. Sawi kailan dan pakchoy yang ditanam pada lahan yang mengandung krom dari limbah industri penyamakan kulit yang diteliti tidak dapat dikonsumsi manusia karena kandungan krom dalam jaringan tanaman bagian tajuk yang umumnya dikonsumsi melebihi ambang batas konsumsi harian sebesar 0,035 mg/kg per hari
Summary
Media tanam yang digunakan dalam penelitian terdiri atas campuran tanah, kompos dan pasir dengan perbandingan 1:1:1. Hasil analisis menunjukkan bahwa kandungan N total sedang, kandungan P dan K tinggi, kadar C-organik tinggi, nisbah C/N tinggi, bahan organik tinggi dan pH tanah netral. Hasil analisis juga menunjukkan bahwa dalam media tanam terdapat unsur Cr dengan konsentrasi rendah (Tabel 2). Analisis terhadap limbah dilakukan untuk mengetahui kandungan-kandungan unsur yang ada termasuk kadar kromium. Tabel 3 menunjukkan bahwa kadar krom limbah industri penyamakan kulit sangat tinggi (19.985 ppm), sehingga berpotensi sangat besar mencemari lingkungan dan membahayakan kesehatan bila masuk ke dalam tubuh manusia melalui rantai makanan. Selain mengandung krom dengan kadar sangat tinggi, limbah industri penyamakan kulit juga mengandung unsur N, P, dan K tinggi, C-organik tinggi, nisbah C/N tinggi, kadar bahan organik tinggi dan pH agak masam sehingga lumpur limbah tersebut berpotensi dimanfaatkan sebagai media tanam yang baik setelah kadar kromnya diturunkan pada ambang batas yang rendah
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