Dr. Manoj Tiwari | Dr. C. V. Raman University (original) (raw)

Papers by Dr. Manoj Tiwari

Liquefaction induced movements and leftover shear strength of the soil, which is very critical fo... more Liquefaction induced movements and leftover shear strength of the soil, which is very critical for analysis. Seismic occasions have an effect on floor conditions. This phenomenon of soil reasons instability in different type of structures. This occurs as a result of numerous instances of structural breakdown. The tensions of the load from the foundations cannot be preserved by the liquefied floor. Foundations that dip into the sand deposit cause the building to sag and eventually collapse. Regions with saturated soils are best suited for soil liquefaction. So many various approaches to assessing soil liquefaction have been developed during the previous few decades for soil liquefaction assessment. Most of them use in open ground results like dynamic penetration test (SPT & CPT), paleo-seismic analysis and Shear Wave analysis & Velocity with site stratigraphy to assess the likelihood of soil strata liquefying. This article develops a more overview element based on available literature. A suggested method detailed in this review is used to identify the important soil compressibility parameters for the CPT-SPT correlations. This method helps to increase the consistency of the CPT-SPT correlations and offers a consistent pattern for crushable and non-crushable sands. Numerous empirical correlations have been proposed in siliceous soils to connect static cone tip resistance to SPT Nvalue.

ScienceDirect, 2019

The present study has been conducted to evaluate the role of seasonal variation on the heavy meta... more The present study has been conducted to evaluate the role of seasonal variation on the heavy metals pollution levels in the surface water bodies located in the environs of a thermal power plant in Bhilai, central India. Acid digestion test on fly ash sample was conducted for the total concentrations of traces (Cr, Cu, Fe, Mn, Pb, and Zn) and, a laboratory batch leaching test to assess the mobility of the selected metals. The average leached percentage order of metals from fly ash are-Cr > Pb > M > Zn > Cd > Fe > Cu was observed. Pre-monsoon metal concentrations ranged between 0.3 to 3.298 mg/L for Cr, 0 to 0.33 mg/L for Cu, 0.37 to 3.51 mg/L for Fe, 0.15 to 0.26 mg/L for Pb, 0.057 to 2.931 mg/L for Mn, and 0.01 to 0.397 mg/L for Zn. Whereas, for the post-monsoon, it ranged between 1.45 to 2.316 mg/L for Cr, 0.007 to 0.009 mg/L for Cu, 0 to 0.731 mg/L for Fe, 0.07 to 0.12 mg/L for Pb, 0.046 to 1.272 mg/L for Mn, and 0.108 to 0.341 mg/L for Zn. These outcomes, regarding the possible level of contamination in water sources, are a major issue with seasonal variation, as it may influence the metal mobility.

Industrialization is essential to meet up upcoming demands of the evolution. All the industrial a... more Industrialization is essential to meet up upcoming demands of the evolution. All the industrial activity releases some amount of by-products as pollution into the environment. Iron and steel industry is one of the major heavy industries of Chhattisgarh and considered as resource intensive and pollution prone and added pollution to air, water resources, precious land. In central India many of the integrated iron and steel industry is highly polluting, non-compliant and resource-inefficient. The aim of the present review is to understand and get aware with the pollution, mainly (i) stack emission as air pollution, and (ii) heavy metal leaching from piled iron and steel slag, by steel plants in Chhattisgarh, central India region.

Current total productions of steel slag in India, are around 12 million tonnes per annum (Indian ... more Current total productions of steel slag in India, are around 12 million
tonnes per annum (Indian Minerals Yearbook, May 2016), which is far
behind the developed countries. Presently in India, due to limited
modes of practices of utilization, huge amount of iron and steel slag
dumped in yards of each production unit and engaging of important
agricultural land and grave pollution to whole environment. An
efficient approach to overcome these problems is the slag utilization.
Physical and chemical characterization of steel slag is a deciding factor
of steel slag utilization as recycled raw material as road aggregate,
cement and concrete admixture, soil stabilizer and construction
materials, etc. This review presents utilization trends of steel slag and
possible potentials for large-scale employment of steel slag in Indian
context.

Power Industry has been, and continues to be, a key factor in the economic growth of most of the ... more Power Industry has been, and continues to be, a key factor in the economic growth of most of the developed and developing countries. In general, the power sector represents the industries with highest environmental impact and has constantly been subject of increasing pressure from new economic, energy saving and environmental issues. Coal based Power Generation has been the backbone of the any developing country. Indian coal is of low grade, having ash content as high as 45% in comparison to imported coals which have low ash content of the order of 10-15% (CEA, 2014-15). Thus, a large amount of ash is being generated by the coal based thermal power plants in India, which not only requires huge areas of precious land for its disposal and management, but, is also one of the major sources of pollution of air, water and soil. This article attempts to underline the uses of this industrial solid waste to make an efficient tool for management of fly ash. To save our environment more research and development needed to discuss the above stated issues.

An analysis was done of five water samples collected from study area, during February-March 2015.... more An analysis was done of five water samples collected from study area, during February-March 2015. The high concentration of alkalinity (209 mg/L) and hardness (220 mg/l) shows the severe condition of river water due to discharge of Industrial effluent. Heavy metal or toxic metal concentration was found negligible while in sample no 1 the concentrations of Pb (0.811 mg/l), Cr (0.642 mg/l), Fe (0.498 mg/l), Zn (0.326 mg/l) and Mn (0.3 mg/l). In other locations some metal concentrations were found below the detectable limit although iron appeared in a small quantity. Hence it is concluded that there is an adverse condition of river water environment due to industrial activities and industrial effluent discharge without treatment be supposed to be stopped to protect the valuable river water from contamination.

This paper is an attempt to estimate the quantity of Industrial solid waste (ISW) that can be gen... more This paper is an attempt to estimate the quantity of Industrial solid waste (ISW) that can be generated in the Durg-Bhilai Twin city (DBTC), C.G, India from 2010 to 2026. The prediction of Industrial solid waste generation plays an important role in solid waste management. Yet achieving the anticipated prediction accuracy with regard to the generation trends facing many fast growing regions is quite challenging. In addition to the population growth and migration, underlying economic development, household size, employment changes, and the impact of waste recycling would influences the solid waste generation interactively. The development of a reliable model for predicting the aggregate impact of economic trends, population changes, and recycling impact on solid waste generation would be a useful advance in the practice of solid waste management [7]. The four input variables considered in the ANFIS model to predict ISW in the study area are Population of Durg-Bhilai Twin City (DBTC), ISW generated at DBTC, Percentage of urban population of the nation and GDP per capita of the nation. ANFIS is used in function approximation, time series prediction, and control [1] [2] [4]. In the absence of the adequate past data on waste generation rates, it is extremely difficult to decide upon the methodology to make any kind of prediction for the future. Hardly any primary survey studies have been made in the study area, which indicates the actual waste quantum generated. As a result, except for data points from 1961 to 2001 population based on census , Industrial solid waste generated at DBTC from 1961 to 2001 and 2009 based on the data collected from the DBTC. The estimates of waste quantum for period from 2010 to 2026,shows that if the growth of industrialization and growth of percentage increase in per capita waste generation, are considered as per the nation projections, the ISW in the study area can be expected by ANFIS model using MAT Lab Version 7.8.0.347 as around 88,980 MT per year in DBTC by 2026. Due to the important role of Waste Generation (WG) prediction in ISWMS, a proper model was developed using ANN and ANFIS models [24][26] [30]. In this study, first WG in DBTC was predicted using ANN and ANFIS models; also uncertainty analysis was used to determine the uncertainty of two hybrid models.

Fly ash and slag leachate pollution can be of great environmental concern due to generation of th... more Fly ash and slag leachate pollution can be of great environmental concern due to generation
of these wastes in huge quantities from their respective industrial units, mainly coalbased
thermal power plants and iron and steel plants. For simulation of natural leaching in
laboratory, various leaching methods are available, but selection of a method that can
exactly simulate the real-life scenario for accurate estimation of various pollutants is
challenging; particularly, the heavy metals present and impact due to reuse or disposal of
these wastes. For choosing the most suitable leaching method according to specific situation,
one must primarily consider the chemical and physical properties of wastes, the
composition of the source, age of waste disposal, and the climatic conditions of the
disposal area. Since these factors may not be specified, a variety of leaching methods with
relevant equipment have been proposed by researchers; that are based on their required
information to particular conditions in absence of a prescribed protocol and non standardization
of equipment. The present review is an attempt to investigate the suitable
leaching method for coal fly ash and slag.

Rapid industrialisation and resulting industrial solid waste from power plants and integrated iro... more Rapid industrialisation and resulting industrial solid waste from power plants and integrated iron and steel industries, have
imposed an enormous environmental pressure on water resources of Chhattisgarh, a state in Central India. Rural population living
nearby the study area is mainly depended on the available surface water in the form of lakes or pond in their vicinity. Therefore it is
necessary to look after the surface water through leachate pollution caused by dumping and disposal of industrial solid waste. In the
present study, ten surface water samples each for pre monsoon and post monsoon were collected for analysis from the surrounding
areas of a major industrial region of Chhattisgarh. The AAS analysis of the surface water samples shows higher concentration of
certain heavy metals above the permissible limits. In the pre monsoon samples the metals Mn and Cr resulted higher concentration
and at the same time metals; Cu, Fe and Pb resulted in lower concentrations. Similarly, for the post monsoon samples, Mn, Cr and Fe
found with higher concentration, while Cu and Pb resulted with lower concentration. The high amount of heavy metals were found
in the analyzed samples shows that there is a real risk for population living in the nearby areas of the industrial region of
Chhattisgarh. Therefore a huge amount of industrial wastes produced needs a proper disposal. Unscientific and poorly-managed
disposal of industrial solid wastes containing heavy metals needs remediation before discharging into the environment.

Major generators of the industrial solid wastes are coal based thermal power plants and integrate... more Major generators of the industrial solid wastes are coal based thermal power plants and integrated iron and steel industries. A large amount of industrial solid wastes like fly ash and slag are yet to be utilized and still remains in the form of uncontrolled dumping sites in the study area. Leachate pollution should get appropriate attention as it may be a source of heavy and toxic metal in soil and it is possible to percolate and may lead to water pollution in the surroundings water sources. In the present investigation the soil samples were collected from the identified area for heavy metal analysis. The heavy metal pollution of the soil samples resulted that, concentration of certain heavy metals is above permissible limit. The heavy metals like Cr, Cd, Fe, Mn, and Pb, shows highest concentration, while metals such as Cu, Cd and Pb shows low concentration. The heavy metal pollution indicates that leachate produced by uncontrolled and unscientific disposal of industrial solid wastes contaminates soil samples of the identified area.

ScienceDirect, 2019