RESEARCH TO PROPOSE THE WASTEWATER TREATMENT SYSTEM FOR HOANG VAN THU JOINT STOCK COMPANY OF PAPER USING HORIZONTAL SUB-SURFACE FLOW CONSTRUCTED WETLANDS

Abstract

This report represents the research about the wastewater treatment ability of Hoang Van Thu joint stock company of paper by a wastewater treatment system using horizoltal sub-surface flow constructed wetland (HF). The model includes of a flocculation tank (D x H = 0.45 x 0.47)m and  a HF (L x B x H = 1.05 × 0.3 × 0.6) m. After treated  interruption via flocculation tank wastewater and added 1% of domestic wastewater is leached  into HF, with flow of 12 liters per day and 5-days retention time.pH of wastewater into the model is from 6.4 to 6.7. The average values of COD, TSS of wastewater  into the model are 1073.33 ±127.55 and 1392.82±98.77 mg/L. The model was operated from 23/02/2018 to 8/5/2018. The result of research indicated that, treated wastewater was neutral pH, ranging from 6.7-7.3. Average removal of COD and TSS of flocculation tank, HF and the model were  (63.89; 85.37; 94.43)% and (75.14; 90.32; 97.57)% respectively. Treated  wastewater reached the limit value of column A of QCVN 12-MT: 2008/BTN & MT and allowed to discharge into receiving water for domestic use.