Browsing by Author "Chhavi Siwach"

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A bibliometric analysis of statistical methods used for river water quality assessment & monitoring during the last three decades (1992–2023)
(John Wiley and Sons Inc, 2025) Supriya Chaudhary; Chhavi Siwach; Shivraj Anand; Virendra kumar Mishra
In the present study, the bibliometric study was performed to assess the river water quality using statistical techniques. There were 681 articles pertinent to river water quality assessment using statistical methods published by the Scopus database from 1992 to 2023. A bibliometric analysis pinpoints the most notable and productive journals, scholars, publications and nations in the subject of study. Keyword analysis also found that river water quality assessment using statistical methods such as machine learning, water quality indexing and health risk assessment are hot topics. The analysis revealed four distinct, interconnected themes that effectively characterize the current state of research on river water quality assessment using statistical methods. These four thematic clusters represent the major areas of focus and methodological approaches currently employed in this field. Based on these identified clusters, highlight promising avenues for future research, suggesting how these established themes can be further developed and expanded upon to advance the field. Subsequently, a research framework was introduced, outlining potential future research directions. This bibliometric analysis provides a comprehensive overview of existing research on river water quality assessment. This study synthesizes prior research to map trends, key contributions and gaps, providing an overview of the field's development. © 2025 CIWEM.
French Type Vertical Flow Constructed Wetland as a Sustainable Solution for Domestic Sewage Treatment
(Springer, 2025) Shivraj Anand; Deepak Gupta; Chhavi Siwach; Jens Nowak; Heribert Rustige; Virendra kumar Mishra
In order to mitigate the risk posed by discharge of untreated wastewater and enhance the quality of wastewater prior to its release or reuse, it is important to adopt nature based treatment technologies. The current study was performed with objective to treat the primary treated sewage collected from a traditional Moving Bed Biofilm Reactor (MBBR) based Sewage treatment plant (STP) by using a two-stage French Type Vertical Flow Constructed Wetland (FVFCW). This pilot-scale study was undertaken in Banaras Hindu University Campus Varanasi, Uttar Pradesh. The wetland unit was a two-stage Vertical Flow Constructed Wetland system (VFCW) filled with two different filter media gravel & sand and planted with two different macrophytes Canna indica and Typha latifolia which was operated for Sustainable treatment of primary sewage. The VFCW was operated at three different Hydraulic loading rate (HLR) i.e. 1800, 2700, 3600 L/day for nine months. The VFCW performed for the treatment of different physicochemical parameters at given loading rates. The maximum removal efficiency of 72.37, 76.47, 100, 87.23, 41.41, 40.77 27.07% was recorded for COD, BOD, Turbidity, TSS, TDS, Phosphate and Ammonia respectively. Most of the Parameters showed maximum removal efficiency at HLR 2700 L/day. The study suggested that Experimental VFCW can be a sustainable solution for wastewater treatment in remote and rural areas of India as well small colonies due to its eco-friendly, cost-effective, low maintenance cost and lack of operational expertise. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.
Revolutionizing remediation: Unveiling the power of Lysinibacillus sp. in tackling heavy metal stress
(Elsevier B.V., 2024) Akanksha Gupta; Chhavi Siwach; Virendra Kumar Mishra
Increased industrialization has elevated heavy metal pollution in soil. Considering their hazardous impact on the ecosystem, it is important to lower heavy metals concentration from the polluted soil. Standard physicochemical methods for metal remediation are quick, effective, and operational; nevertheless, they come with a high cost and are not appropriate for large contaminated areas. They require a lot of energy, produce a large amount of toxic sludge, are not practical for low metal concentrations, and are not eco-friendly. An effective technique for eradicating hazardous heavy metals from contaminated soil is desperately needed given the state of environmental degradation that exists today. Using microorganisms, particularly bacteria resistant to hazardous metals, is the most economical method known as bioremediation. Owing to the enduring characteristics of heavy metals in polluted soil, inhabitant microorganisms require bioengineering in order to assess an appropriate biotechnical method for the removal and/or detoxification of heavy metals in contaminated soil. Many microorganisms have been reported with the ability to alleviate heavy metals from a contaminated environment; Lysinibacillus being one of them. This review highlights the efficiency of Lysinibacillus in heavy metal remediation and how exactly this genus dealt with metal stress at the cellular level. We have evaluated various studies of bioremediation by this particular genus and also illuminated its plant growth-promoting properties. © 2024 The Authors