Feasibility of treating the wastewater from herbs and rose water extraction factories and choosing the appropriate method (case study of Kashan Industrial Towns Company)
Subject Areas : Unconventional water extraction systemsFarzaneh Qaderi Nasab 1 , Mahsa Sahhafi pour 2 , Mozhgan Mirzaee 3
1 - PhD in Water Science and Engineering, Water Resources Engineer, Kerman Regional Water Company, Kerman, Iran.
2 - Master's Student in Environmental Engineering, Daneshpajoohan Pishro Higher Education Institute, Isfahan, Iran.
3 - Faculty Member of Daneshpajoohan Pishro Higher Education Institute, Isfahan, Iran.
Keywords: Wastewater treatment, Rose water extraction, Coagulation, Anaerobic treatment, Ozonation, Advanced oxidation,
Abstract :
Nowadays, with advances in technology and the use of industrial methods instead of traditional methods, the production of rose water and herbal distillates has significantly increased. In producing rose water and herbal distillates, a large amount of wastewater is generated. This is happening while drought, water crisis, and industrial growth have pushed Iran to purify and reuse this wastewater. In this research, the purifiability of wastewater from herbal distilleries and rose water factories in the large industrial townships of Kashan city, located in Isfahan province, was investigated. To this end, the available records and documents were reviewed, followed by field visits and the collection of wastewater samples. Necessary analyses were then conducted on the collected data. In the stage of suspended solids removal, the use of cloth filters, alum coagulant (Al2 (SO4)3), ferric chloride (FeCl3), and polyaluminum chloride (PAC) were studied. Furthermore, in the stage of organic matter removal, the use of potassium permanganate (KMnO4) and the experiences of other researchers, as well as the use of ozone, was examined. Subsequently, ozone treatment and simultaneous use of ozone and UV were investigated and analyzed, and a corresponding pilot was constructed. In the process of producing rose water and herbal distillates, a large amount of wastewater is generated. This is happening while drought, water crisis, industrial growth have pushed Iran to purify and reuse this wastewater. In this research, the profitability of wastewater from herbal distilleries and rose water factories in the large industrial townships of Kashan city, located in Isfahan province, was investigated. To this end, the available records and documents were reviewed, followed by field visits and collection of wastewater samples. Necessary analyses were then conducted on the collected data. In the stage of suspended solids removal, the use of cloth filters, alum coagulant (Al2 (SO4)3), ferric chloride (FeCl3), and polyaluminum chloride (PAC) were studied. Furthermore, in the stage of organic matter removal, the use of potassium permanganate (KMnO4) and the experiences of other researchers, as well as the use of ozone, was examined. Subsequently, ozone treatment and simultaneous use of ozone and UV were investigated and analyzed, and a corresponding pilot was constructed. The results showed that approximately 50% of the organic matter can be removed through coagulation and flocculation, and the remaining can be eliminated through an advanced oxidation process (ozone + UV) with sufficient retention time. As a result, in high capacities of wastewater it is recommended to use an anaerobic treatment method, ozonation of the outlet of the treatment plant and filtrating leads to achieve complete wastewater treatment in accordance with the discharge standards into the environment. Therefore, this method has been introduced as a suitable method for wastewater treatment in Kashan Industrial Towns Company.
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