Reuse of Incinerated Textile Mill Sludge as Adsorbent for Dye Removal

Shrikant S Jahagirdar,Surathkal Shrihari,Basavraju Manu 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.7

Textile industry is one of the largest and oldest industries in India. Textile mill uses large quantities of water for its variety of wet processes, which in turn generates a large amount of waste water. Effluent treatment plants treat textile mill waste water using a variety of chemical coagulants thus producing greater amount sludge. Disposal of sludge is a challenging problem. In this study Textile mill sludge was incinerated at 800oC and used as an adsorbent without any activation. SEM images confirmed that, sludge ash was porous in nature and could be used as an adsorbent. For the entire study, Remazol blue dye was used. Experimental studies were carried out in an acidic pH range, showed good dye removal by using incinerated textile mill sludge ash. Experimental results obtained fitted well in Langmuir and Freundlich isotherms.

농업기상 정보 및 배분 네트워크 현황

Shrikant Jagtap,Chunqiang Li 한국농림기상학회 2004 한국농림기상학회지 Vol.6 No.2

어느 겨울날 저녁

Shrikant Varma,강경숙 한인문화연구원 1986 한인문화논총 Vol.4 No.-

Organophotocatalytic oxidation of alcohols to carboxylic acids

Shrikant D. Tambe,Eun Jin Cho 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.11

A sustainable photochemical protocol for the oxidation of alcohols to ketonesand carboxylic acids has been developed by using 2,4,6-triphenylpyrylium tetrafluoroborate(TPPT) as organophotocatalyst and molecular oxygen as oxidantunder visible light irradiation. The key reactive oxygen species, superoxide(O2•) for the first oxidation step from alcohol to aldehyde and singlet oxygen(1O2) for the second oxidation step from aldehyde to carboxylic acid, were generatedsuccessfully by electron transfer and energy transfer pathways, respectively. A range of primary and secondary alcohols were converted to thecorresponding carboxylic acids or ketones, and the optimized reaction conditionswere applied to the synthesis of benzocoumarin.

Use of Coconut Coir Fibers as an Inert Solid Support for Production of Cyclosporin A

Shrikant A. Survase,Celine Bacigalupi,Uday S. Annapure,Rekha S. Singhal 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.6

In the present study, coconut coir was evaluated as an inert support for the production of cyclosporin A (CyA) using Toly-pocladium inflatum MTCC 557 by solid state fermentation. Initially, four different inert supports such as coconut coir, polyurethane foam, polystyrene beads, and sugarcane baggase were screened using different production media as moistening agents for the maximum production of CyA. Different parameters such as fermentation time, carbon sources, moisture content, pH, and inoculum size were optimized. It was observed that coconut coir impregnated with medium modified with glycerol as carbon source, pH 6, at 80% moisture content, and inoculum size of 2.5 mL/2.5 g support produced 2641 mg/kg of CyA after 12 days as compared to 998 mg/kg before optimization. The yields were further increased to 3597 mg/kg substrate with addition of combination of amino acids after 48 h of fermentation In the present study, coconut coir was evaluated as an inert support for the production of cyclosporin A (CyA) using Toly-pocladium inflatum MTCC 557 by solid state fermentation. Initially, four different inert supports such as coconut coir, polyurethane foam, polystyrene beads, and sugarcane baggase were screened using different production media as moistening agents for the maximum production of CyA. Different parameters such as fermentation time, carbon sources, moisture content, pH, and inoculum size were optimized. It was observed that coconut coir impregnated with medium modified with glycerol as carbon source, pH 6, at 80% moisture content, and inoculum size of 2.5 mL/2.5 g support produced 2641 mg/kg of CyA after 12 days as compared to 998 mg/kg before optimization. The yields were further increased to 3597 mg/kg substrate with addition of combination of amino acids after 48 h of fermentation

Hydrodynamic Cavitation: An approach to Degrade Chlorpyrifos Pesticide from Real Effluent

Shrikant Bhausaheb Randhavane,Anjali K. Khambete 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.7

Chlorpyrifos (O,O-diethyl O-3,5,6-trichloropyridin-2-yl phosphorothioate) is a broad spectrum organophosphate pesticide whichis widely used in agriculture and residential pest control throughout the world. It is moderately toxic to humans, which persists innature for relatively long period due to its physicochemical and structural properties, low volatilization, affecting environmentalmatrices. Thus has been selected as model pollutant for degradation using hybrid treatment method of Hydrodynamic Cavitation(HC). It was found that Chlorpyrifos in real effluent sample can be degraded with orifice induced cavitating conditions. Effect ofvarious process parameters such as operating inlet pressure (over range of 3-8 bars), operating temperatures (with sets of intensecooling, moderate cooling and uncontrolled operation) and pH (natural pH = 10, neutral = 7 and acidic = 3) is investigated for extentof degradation of Chlorpyrifos. Results reflect that an optimum value of inlet pressure (5 bars) gave maximum removal/degradationof 72.7%, high temperature and acidic pH of 3 are suitable. To study the effect of intensification, ozone was used as an intensifyingagent. Ozone alone gave 12.2% degradation, but when combined with hydrodynamic cavitation, it resulted into 100% efficiency in45 minutes of treatment time. Work presented in this paper can be said to be concluding to the effective use of hydrodynamiccavitation in combination with ozone for the degradation of Chlorpyrifos in real wastewaters.

Rough Set and Genetic based Model for Extracting Weighted Association Rules

Shrikant Brajesh Sagar,Akhilesh Tiwari 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.11

A novel approach for the efficient weighted association rule mining proposed in this present paper. The proposed approach reducts the transactional dataset (weighted) by utilizing the power of Rough Set theory. Furthermore, proposed approach acquires the benefit for weighted measures (w-support, w-confidence) for obtaining the most profitable weighted frequent itemsets and the Genetic Algorithm for the extracting the desired set of optimized weighted association rules. Experimental analysis of proposed approach has been done and observed that the approach works well and will be helpful in situation when there is a requirement for the consideration of extracting the best weighted association rules in decision-making process.

Comparing geometric parameters of a hydrodynamic cavitation process treating pesticide effluent

Shrikant B. Randhavane 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.2

Paper focuses on comparison between two different orifice plate configurations (plate number 1 and plate number 2) used as cavitating device in the hydrodynamic cavitation reactor for improving pollutant removal efficiencies. Effect of four different parameters such as hydraulic characteristics (in terms of range of flow rates, orifice velocities, cavitation number at different inlet pressures); cavitation number (in range of 5.76-0.35 for plate number 1 and 1.20-0.35 for plate number 2); inlet pressure (2-8 bars) and reaction time (0 to 60 min) in terms of chemical oxygen demand (COD) removal and chlorpyrifos degradation has been studied and compared. Optimum inlet pressure of 5 bars exists for degradation of pollutants for both the plates. It is found that geometry of orifice plate plays important role in removal efficiencies of pollutant. Results obtained confirmed that orifice plate 1 with configuration of 1.5 mm 17 holes; cavitational number of 1.54 performed better with around 60% COD and 98% chlorpyrifos removal as compared to orifice plate 2 having configuration of 2 mm single hole; cavitational number of 0.53 with 40% COD and 96% chlorpyrifos in 2 h duration time.

Statistical Optimization for Improved Production of Cyclosporin A in Solid-State Fermentation

Shrikant A. Survase,Uday S. Annapure,Rekha S. Singhal 한국미생물 · 생명공학회 2009 Journal of microbiology and biotechnology Vol.19 No.11

Spermine and oxacillin stress response on the cell wall synthesis and the global gene expression analysis in Methicillin-resistance Staphylococcus aureus

Shrikant Pawar,Xiangyu Yao,Chung‑Dar Lu 한국유전학회 2019 Genes & Genomics Vol.41 No.1

Methicillin-resistant Staphylococcus aureus (MRSA) is a rapidly emerging bacteria causing infection, which has developed resistance to most of the beta-lactam antibiotics because of newly acquired low-affinity penicillin-binding protein (PBP2a), which can continue to build the cell wall when beta-lactams block other PBPs. Exogenous spermine exerts a dose-dependent inhibition effect on the growth of Escherichia coli, Salmonella enterica serovar, and S. aureus. Selection of an MRSA Mu50 derivative which harbors mutation on PBP2 gene (named as MuM) showing spermine resistance and which confers a complete abolishment of spermine-beta-lactam synergy was identified. To further investigate the gene expression changes, a transcriptome profiling of MuM against Mu50 (wild-type) without any treatment, MuM and Mu50 in response to high dose spermine and Mu50 in response to spermine-beta-lactam synergy at 15, 30 and 60 min time points was performed. Functional annotation was further performed to delineate the metabolic pathways associated with the significant genes. A significant down-regulation in the iron regulatory system, potassium channel uptake and polyamine transport system with an up-regulation in general stress response sigB dependent operon in MuM strain at 15, 30 and 60 min time points with spermine treatment compared to Mu50 strain was observed. Analysis of spermine-dependent synergy with beta-lactams on cell wall synthesis revealed that it significantly reduces the degree of cross-linkage on cell wall with no change in trypsin digestion pattern of purified PBPs and without affecting PBPs expression or PBPs acylation by Bocillin. A strong relation between PBP2 protein and general stress sigB response, iron, potassium and polyamine transport systems was observed. SigB regulon should be activated on stress, which was not seen in some of our previous studies where it was down-regulated in wild-type Mu50 strain with spermine stress. Here, an intriguing finding is made where there seems to be a correction of this abnormal response of no SigB induction to a significant induction by PBP2 mutation. In MuM strain, a significant downregulation of KdpABC operon genes at 15, 30 and 60 min time points on spermine stress is seen, which seems to be absent without spermine treatment. Since KCL has been found to protect the cell against spermine stress in wild-type strain by induction of KdpABC operon, it fails to do so in MuM strain underlying the importance of PBP2 protein in spermine stress. Analysis of spermine-dependent synergy with beta-lactams on cell wall synthesis revealed that it significantly reduces the degree of cross-linkage on cell wall with no change in trypsin digestion patterns of purified PBPs and without affecting PBPs expression or PBPs acylation by Bocillin. Furthermore, spermine does not help in enhancing the binding of beta-lactams to PBPs and binding of spermine to PBPs does not cause conformational changes to PBPs, as tested with trypsin digestion patterns. Future studies on the molecular mechanism of spermine interactions with these systems hold great potential for the development of new therapeutics for MRSA infections.