id	keyword
american_scientific_journal-5356	sand
american_scientific_journal-5356	filtration
american_scientific_journal-5356	filter
american_scientific_journal-5356	wastewater
american_scientific_journal-5356	media
american_scientific_journal-5356	straw
american_scientific_journal-5356	rice
american_scientific_journal-5356	removal
american_scientific_journal-5356	anthracite
american_scientific_journal-5356	efficiency
american_scientific_journal-5356	treatment