Investigation of the Quality and Pollution Level of Waste Water Obtained from Recycling of MDF Wastes

The cellulose industry is one of the most important and influential industries in developed and developing countries. Waste recycling is one of the activities that have recently been considered in this industry. Despite the enormous economic and environmental benefits of recycling, this process results in the generation of effluent which is important for the study of its pollution.

For recycling of MDF wastes two different method including hydrothermal and ohmic heating were utilized. Hydrothermal method was done at 105˚C for 150 min and ohmic heating method was carried at 100 ˚C for 2 different time duration (2 and 4 min).The chemicals contained in waste waters obtained from recycling of MDF wastes were determined using of chromatography and mass spectroscopy (GC/MS) test.  Additionally, pH value, BOD, COD, TDS and TSS for all kinds of waste waters were measured.

The results showed that the nitrogenous compounds had the most concentration in waste water obtained from hydrothermal method, and in the wastewater produced by ohmic method, both the 2 and 4 mins.

The most active materials were the acids. The obtained waste waters included chloride phenol compounds, tannins and lignin derivatives and their BOD, COD and suspended compounds were higher than the requirements defined in standard. Filtration method can be used for decreasing the amount of suspended solids.