A review natural polymeric coagulants in wastewater treatment

The use of conventional chemical coagulant in treatment of wastewater is gaining great attention. Drawbacks related to the prolonged effects on human health and environment due to the generation of by-product non-biodegradable sludge are becoming the latest topics. Transition from chemical to natural coagulant can be a good strategy to reduce the aforementioned drawbacks. Therefore, this review aims to provide critical discussions on the use of natural coagulant along with the comparative evaluation over the chemical coagulant. Treatment performances by chemical and natural coagulant have been reviewed on various types of wastewater with different success rates. Based on this review, a transition from the use of chemical to natural coagulant is highly suggested as the performance of the natural coagulant is comparable to that of the chemical coagulant and in some cases even better. The comparative advantages and disadvantages also convinced that the natural coagulant stands a great chance to be used as an alternative over the chemical coagulant. Though the current utilization of natural coagulant is encouraging, three main aspects were overlooked by researchers: active coagulant agent, extraction, and optimization due to different wastewater characteristics. Furthermore, delving into these aspects could clarify the uncertainties on the natural coagulant. Hence, it makes this transition a prospect of green technology with sustainable application towards wastewater treatment.

Recent Advances on Coagulation-Based Treatment of Wastewater: Transition from Chemical to Natural Coagulant

Fate of antibiotic resistant genes in wastewater environments and treatment strategies - A review.

The global paucity of water resources and the degradation of water quality have necessitated a need for the restoration of water bodies for the last two decades. Due to increasingly stringent requirements in quality, reliability, economics and sustainability, treatment of polluted water employing traditional technologies has become a formidable challenge many a time in meeting the desired goals. Green technologies are identified as a sustainable method that can boost social and economic growth, conserve natural resources and reduce detrimental impacts on the environment and social wellbeing. However, less effort has been made to render a comprehensive overview from the perspective of the real-world application of these technologies and their underlying mechanisms. This review attempts to provide a critical insight into the frugal and eco-friendly technologies under three groups viz. microbial technologies, bio preparations and integrated eco-technologies by considering various factors such as optimum operating conditions, underlying mechanisms, efficiency, techno-economic viability, and potential challenges. Among these, integrated ecotechnologies have shown the best performance for the removal of a wide range of pollutants in the real-world scenario. These are superior in ensuring the consistency and durability of the efficacy of the systems. The present review is expected to aid in the selection of appropriate technologies for surface water rejuvenation under varying conditions and would lead to an addition in the existing knowledge base on surface water remediation methods enabling further research in this domain.

A review on green technologies for the rejuvenation of polluted surface water bodies: Field-scale feasibility, challenges, and future perspectives

Wastewater treatment using a natural coagulant (Moringa oleifera seeds): optimization through response surface methodology

Reusing waste water by appropriate treatment is an effective method for substantiating the ever increasing water demand for construction, irrigation, domestic and industrial purposes. The greywater is the domestic waste water that does not contain the toilet effluent and it is converted and used for non-potable purpose through coagulation and flocculation by using natural coagulant.The main objective of this work is to evaluate the coagulating efficiencies of various natural coagulants on synthetic greywater by varying pH, mixing speed, mixing time and coagulant dosage.Powdered coagulants obtained from tamarind seeds, moringa oleifera, banana peels and fly ash were compared with conventional commercial coagulants like alum for synthetic and real greywater.The natural coagulants have shown significant performance compared to chemicals like alum.The turbidity removal efficiency for tamarind seeds, moringa oleifera, banana peels and fly ash were found to be 61.33%, 85.75%, 90.42%, 94.27% against 96.49% obtained from alum on treating with synthetic grey water under identical conditions.

Vassilis Voudris

Papers

Performance of Natural Coagulants on Greywater Treatment