EVALUATION OF NITRATE REMOVAL FROM DAIRY WASTEWATER BY MEMBRANE DISTILLATION: A LABORATORY MODEL APPROACH

Abstract

The dairy industry is considered one of the main industries not only in Iraq in particular but throughout the world. Different treatment methods have been used over time and in different countries. Here, membrane distillation has been used to treat wastewater generated by this industry to reduce the burden on the environment. In this paper, direct membrane distillation was used to remove nitrates from wastewater discharged from dairy plants. This method is easy to operate, easy to manage, and has many economic benefits. This article has been using the HACH instrument with all kits needed to achieve the tests. For determination of nitrates in samples by the Calmagite Colorimetric method. HACH Method 8030. 100 mL Marked Dropping Bottle. All other instruments have been achieved according to APHA, AWWA, and WEF. On the other hand, scanning electron microscopy (SEM) has been used to watch the formation of nitrate on membrane surfaces. The results obtained in treating the samples that were synthesized and prepared according to the characteristics of dairy wastewater showed the ability of this method to remove nitrates by up to 80-85%, on the other hand, temperature affects the value of MD and is directly relative to flux. The temperature of the treated water plays an important role in determining the percentage of nitrate removal through the membrane, as well as the latter's enjoying chemical and physical features that give them positive points in its removal of wastewater when the liquid temperature had been raised.