PENGARUH LIMBAH CAIR INDUSTRI TAHU TERHADAP KUALITAS AIR SUNGAI BABURA KECAMATAN MEDAN POLONIA (The Disposal Effect of The Waste Water of Tofu Factory to Water Quality Of The Babura River Medan Polonia District) - Dina, Sharah (Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara, 2014)