Efektifitas instalasi pengolahan air limbah (IPAL) dalam memperbaiki kualitas air limbah (COD, BOD, TSS, minyak dan lemak, amonia (NH3), dan total coli) di Rumah Sakit Ibu dan Anak Resti Mulya tahun 2017 = Effectiveness of wastewater treatment plant (WWTP) in improving the quality of waste water (COD, BOD, TSS, oil and fat amonia (NH3), and total coli) at Mother and Child Resti Mulya Hospital 2017