Degradation of Direct Dyes Waste by Advanced Oxidation Processes (AOPs) Method of H2O2/MnO2 Combination with BOD, COD, and pH as The Test Parameters - Augustia, Venitalitya Alethea Sari (Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta, 2018)