Neutralization of alkaline industrial wastewaters using Exiguobacterium sp.

Kulshreshtha, Niha Mohan; Kumar, Anil; Dhall, Purnima; Gupta, Saurabh; Bisht, Gopal Singh; Pasha, Santosh; Singh, V. P.; Kumar, Ram

doi:10.1016/j.ibiod.2010.01.003

Cited by 34 publications

(17 citation statements)

References 32 publications

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“…Recent studies showed that large bacterial populations exist in alkaline olive mill wastes (Ntougias et al, 2006), and other facultative alkali bacteria such as Exiguobacterium sp. were capable of lowering the pH in highly alkaline wastewater from 12.0 to 7.5 (Kulshreshtha et al, 2010). These studies suggested that alkali bacteria could degrade pollutants under highly alkaline conditions and had the significant advantage of not being easily contaminated by neutral microorganisms.…”

Section: Introductionmentioning

confidence: 83%

Wastewater treatment by alkali bacteria and dynamics of microbial communities in two bioreactors

Yang¹,

Zhang²,

Zhang³

et al. 2011

Bioresource Technology

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Section: Introductionmentioning

confidence: 83%

Wastewater treatment by alkali bacteria and dynamics of microbial communities in two bioreactors

Yang¹,

Zhang²,

Zhang³

et al. 2011

Bioresource Technology

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“…They can, if coriander is not heated at high temperature before eating, severely endanger human health. Being neither vegetable pathogens nor pathogenic bacteria for human, Brevibacterium (Troxler, Funke, Von Graevenitz, & Stock, ), Exiguobacterium (Kulshreshtha et al, ; Ponder et al, ), and Deinococcus (Daly, ) are ordinary bacteria that constitute the total number of aerobic bacterial colonies. Therefore, controlling the number of ordinary bacteria besides spoilage and pathogenic bacteria, that is, reducing the total colony number, can also prolong the shelf life and increase the safety level of fresh‐cut coriander.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, controlling the number of ordinary bacteria besides spoilage and pathogenic bacteria, that is, reducing the total colony number, can also prolong the shelf life and increase the safety level of fresh‐cut coriander. Moreover, Exiguobacterium (Kulshreshtha et al, ) and Deinococcus (Daly, ) cannot be easily removed from fresh‐cut coriander during cleaning process due to the resistances to basic environment and radiation respectively. Exiguobacterium (Ponder et al, ), Erwinia (Nguyen‐The & Carlin, ) and Pseudomonas (Tzschoppe et al, ), which tolerate storage at low temperatures, cannot be readily controlled axiomatically.…”

Section: Discussionmentioning

confidence: 99%

Effect of chlorine dioxide on decontamination of fresh‐cut coriander and identification of bacterial species in fresh‐cutting process

Jiang

Chen

Liu

et al. 2017

J Food Process Preserv

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Fresh‐cut coriander is one of the most frequently consumed leafy vegetables in China due to convenience and flavor, but it has safety issue mainly because of microbial contamination. The optimum conditions for treating fresh‐cut coriander with chlorine dioxide were concentration of 60 mg/L, time of 10 min and solution to fresh‐cut product ratio of 8:1. This process decreased the total number of aerobic bacterial colonies to 2.1 lg cfu/g. Seven bacterial strains were identified through 16S rDNA sequence analysis and morphological observation. The potentially pathogenic bacteria such as Staphylococcus, Brevibacterium, Pseudomonas and Acinetobacter, as well as other bacteria were effectively decreased by chlorine dioxide treatment. Therefore, treating fresh‐cut coriander with chlorine dioxide under appropriate conditions during processing or storage can both effectively reduce the food safety risk. These results provide a valuable theoretical basis for improving the safety of fresh‐cut products. Practical applications This is the first study that identifies the microbial genera on fresh‐cut coriander, providing evidence for the need of commercial sterilization. The results of this study can be applied to industrial production and provide references for postharvest quality handlings of other fresh‐cut vegetables and fruits.

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“…Their wastewater is reported to have pH in a range from 7.5 to 12. The wastes require to be neutralized before releasing to an environment [3].…”

Section: Introductionmentioning

confidence: 99%

Input/Output Linearization for a Real-Time pH Control: Application on Basic Wastewater Neutralization by Carbon Dioxide in a Fed-Batch Bubble Column Reactor

Panjapornpon¹,

Saksomboon²,

Juyteiy³

et al. 2019

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A model-based application for pH regulation in a pilot unit of wastewater treatment by carbon dioxide gas is presented. A reactor pH is an important factor to enhance the gas absorption of carbon dioxide bubbles in an alkaline wastewater, and it needs to operate within a tight pH range. Under a fed-batch operation mode, the reactor behavior has unstable dynamics resulting in a difficulty to achieve the pH target by manipulating the basic influent feed rate. To solve the problem, an input/output (I/O) linearization is applied because it provides excellent the setpoint trackability with a few numbers of tuning parameters required. The first principles approach is employed for reactor modeling. The model is then used in the I/O feedback formulation. Control performance is evaluated through a real-time implementation to track the desired pH target in comparison with a two-degree-of-freedom control scheme used as a compared case. The developed control system proficiently forces the output to the pH target and also improves the control performances.

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Neutralization of alkaline industrial wastewaters using Exiguobacterium sp.

Cited by 34 publications

References 32 publications

Wastewater treatment by alkali bacteria and dynamics of microbial communities in two bioreactors

Wastewater treatment by alkali bacteria and dynamics of microbial communities in two bioreactors

Effect of chlorine dioxide on decontamination of fresh‐cut coriander and identification of bacterial species in fresh‐cutting process

Input/Output Linearization for a Real-Time pH Control: Application on Basic Wastewater Neutralization by Carbon Dioxide in a Fed-Batch Bubble Column Reactor

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