Applicable VFCW Technology in Parallel with Biochar-Mixed Soils for Treating Formaldehyde in Ethylene Glycol Factory Wastewater

The research is aimed to study on the applicability of VFCW technology by using Biochar-soil mixing as growing materials of Cyperus and Typha for treating wastewater containing formaldehyde as produced through the production processes of ethylene oxide and ethylene glycol that belonging to TOC Glycol Company inside Mabtaput Industrial Estate in Eastern Thailand. The results found that VFCW technology in form of small experimental unit of Lysimeter was applicable together with Cyperus Biochar:Soil Ratio of 1:50 and planting Cyperus. The application of formaldehyde wastewater flow rate 100 ml/min was shown highest potential for having breakthrough point at 20 liters, HRT 6.67 hours, formaldehyde effluent quality 1.03 mg/L (influent 20 mg/L) treatment efficiency 94.85% and encouraging the aquatic plants in highest numbers up to 140 stems of Cyperus as the same as more Pseudomonas sp. 1.8x10 5 CFU/g.soil for better decomposers of formaldehyde wastewater.