Modification of natural zeolite and its application to advanced recovery of organic matter from an ultra-short-SRT activated sludge process effluent
The research paper discusses a study aimed at enhancing the recovery of organic matter from wastewater using modified natural zeolite (MZ). The research focuses on the modification of natural zeolite by loading it with three types of chemical coagulants: ferric sulfate (Fe2(SO4)3), aluminum sulfate (Al2(SO4)3), and zinc sulfate (ZnSO4). The study compares the organic recovery capabilities of modified zeolite against other natural adsorbents, such as kaolin, bentonite, and diatomite, in the context of an ultra-short sludge retention time (SRT) activated sludge process.
Key findings indicate that the modification process significantly improves the organic recovery efficiency of zeolite. The Brunauer–Emmett–Teller (BET) surface area measurements, scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses confirm that the zeolite's surface properties change upon modification, leading to a decrease in specific surface area but an increase in zeta potential, which enhances its ability to adsorb negatively charged organic matter.
The study reports that the optimal organic recovery efficiencies achieved were 72.0% for MZ4 (Fe2(SO4)3), 67.6% for MZ9 (Al2(SO4)3), and 61.2% for MZ13 (ZnSO4). The mechanisms behind these improvements are attributed to both coagulation effects from the metal ions and adsorption effects due to the zeolite's surface properties. Additionally, the modified zeolites reduce the potential for generating disinfection byproducts in treated effluent.
The research concludes that modified zeolite presents a promising method for advanced organic recovery from wastewater, offering a cost-effective and environmentally friendly alternative to traditional methods.
This research paper is significant in the field of environmental science and wastewater treatment as it addresses the pressing need for effective methods to recover organic matter from wastewater, which is often wasted in conventional treatment processes. The findings contribute to ongoing discussions about sustainable wastewater management and resource recovery, particularly in the context of energy recovery from wastewater. By demonstrating the effectiveness of modified natural zeolite, the study provides insights into alternative materials that can enhance the efficiency of wastewater treatment systems. The research also highlights the dual benefits of improving organic recovery while minimizing the formation of harmful byproducts, making it relevant for both environmental protection and resource recovery strategies.
