Treating wastewater by new herbal coagulants


Tehran (ISNA) - In a new pilot project carried out by Institute of Environment, affiliated to Jahad Daneshgahi, herbal coagulants were produced to replace the chemical ones in treating wastewaters, SinaPress reported.

The senior expert at the institute, Hanieh Mirbolooki said, “Currently chemical coagulants are adopted to clarify wastewater; however, we attempted to produce new herbal coagulants to replace the old ones”.

“Selecting 10 plants in laboratory, we took their extract and introduced them with a determined level to some wastewater samples; the results indicated that 5 plants were fully potential to replace the chemical coagulants. Finally, the COD of the samples was reduced up to 90 percent.”

Chemical Oxygen Demand (COD) is assumed as a significant water quality parameter since it provides an index to assess the effect discharged wastewater will have on the receiving environment.

Higher COD levels mean a greater amount of oxidizable organic material in the sample, which will reduce dissolved oxygen (DO) levels. A reduction in DO can lead to anaerobic conditions, which is deleterious to higher aquatic life forms.

“No chemical matter was used in the extraction process of the studied plants as solely water was employed. Even salt was not adopted so that the final samples of wastewater be free of any chemicals. Entering the receiving environment, the new product reduced COD levels in the samples,” Mirbolooki maintained.

“Using chemical coagulants leads to the onset of diseases like Alzheimer in human beings and the destruction of aquatic organisms, as well. Entering the environment through chemical coagulants, aluminum can lead to these negative complications if used at a high dose. This is while the herbal coagulants do not have such negative effects,” she concluded.

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