Microbiological Degradation of Organic Pollutants from Industrial Wastewater

2021 ◽  
pp. 83-114
Author(s):  
Ayantika Banerjee ◽  
Moharana Choudhury ◽  
Arghya Chakravorty ◽  
Vimala Raghavan ◽  
Bhabatush Biswas ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Industrial Wastewater

Pretreatment of wastewater containing a mixture of organic pollutants obtained from a CC2 plant by coagulation

2008 ◽  
Vol 58 (5) ◽  
pp. 1071-1077
Author(s):  
Bidhan C. Bag ◽  
Makireddi Sai ◽  
Mahavir P. Kaushik ◽  
Krishnamurthy Sekhar ◽  
Chiranjib Bahttacharya
Keyword(s):  
Acetic Acid ◽  
Organic Pollutants ◽  
Aromatic Compounds ◽  
Carboxymethyl Cellulose ◽  
Industrial Wastewater ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Manufacturing Plant ◽  
Colloidal Materials

Coagulation is one of the most important physicochemical treatment steps in industrial wastewater to reduce the suspended and colloidal materials responsible for colour and turbidity of the wastewater. The manufacturing plant of N,N′-Dichloro bis (2,4,6-trichlorophenyl) urea (CC2) produces wastewater containing pyridine, acetic acid and diphenyl urea (DPU). The wastewater also contains lot of suspended solids like CC2 and various poly-aromatic compounds. In our present investigation, our basic aim was to find an effective coagulation process for the pretreatment of wastewater discharged from the CC2 plant. Studies were conducted to find out a suitable and effective coagulant for pretreatment of this wastewater. Various coagulating agents such as alum, ferric chloride, sodium carboxymethyl cellulose (Na-CMC) were used. Alum was found to be the most effective coagulant. Coagulation of the wastewater resulted in the total suspended solids (TSS) removal in the range of 92–94% and chemical oxygen demand (COD) removal in the range of 59 to 65% at a dose of 500 mg L−1 of alum at a pH ≥ 7.0. After coagulation the concentration of pyridine in wastewater was found to be reduced by 10.0% and that of DPU 40–45% with a dosage of 500 mg L−1 alum.

Advances in Preparation of Activated Carbon from Sugarcane Bagasse and Using it to Treatment of Wastewater Research

2014 ◽  
Vol 1010-1012 ◽  
pp. 15-19
Author(s):  
Yan Min Qin ◽  
Mei Na Liang ◽  
Dun Qiu Wang
Keyword(s):  
Heavy Metals ◽  
Activated Carbon ◽  
Organic Pollutants ◽  
Sugarcane Bagasse ◽  
Industrial Wastewater ◽  
Research Progress ◽  
Future Research ◽  
Preparation Methods ◽  
Existing Problems

This paper discusses the utilization situation and existing problems of sugarcane bagasse, and briefly the research progress of preparation of activated carbon from sugarcane bagasse (ACSB). It reviews the application of activated carbon prepared from sugarcane bagasse, such as, industrial wastewater decolorizing, removal of organic pollutants and heavy metals in wastewater in the domestic and overseas in recent years. Points out the shortage of preparation methods, the existing problems and puts forwards some questions need to be solved in future research. Moreover, the prospect of application and the trends in future research of activated carbon from sugarcane bagasse are proposed.

Iron Doped TiO2 Photocatalysts for Environmental Applications: Fundamentals and Progress

2014 ◽  
Vol 925 ◽  
pp. 689-693 ◽  
Author(s):  
Nadia Riaz ◽  
Bustam-Khalil Mohamad Azmi ◽  
Azmi Mohd Shariff
Keyword(s):  
Organic Compounds ◽  
Organic Pollutants ◽  
Water Scarcity ◽  
Industrial Wastewater ◽  
Environmental Applications ◽  
Clean Water ◽  
Water And Sanitation ◽  
Recent Advances ◽  
The World ◽  
Iron Doped

One of the most pervasive problems affecting people throughout the world is inadequate access to clean water and sanitation. Problems with water are expected to grow worse in the coming decades, with water scarcity occurring globally. Many recent studies have been reported on the photodegradation of the organic compounds in industrial wastewater in the presence of TiO2 semiconductor as photocatalyst. Heterogeneous photocatalysts using iron as a dopant metal, so far, have been reported for various environmental applications. This paper highlights the recent advances and applications of Fe-TiO2 photocatalysis for the degradation/photodegradation of various pollutants, alkanolamines and other organic pollutants like phenols and dyes.

scholarly journals DIFFERENT BIOLOGICALLY ACTIVATED SYSTEMS RESISTANCE TO INHIBITION

2005 ◽  
Vol 1 ◽  
pp. 105
Author(s):  
V. Račys ◽  
D. Kliaugaite ◽  
D. Jankūnaite ◽  
I. Urniežaite
Keyword(s):  
Activated Sludge ◽  
Environmental Protection ◽  
Organic Pollutants ◽  
Industrial Wastewater ◽  
Inhibition Test ◽  
Conventional Activated Sludge ◽  
Respiratory Inhibition ◽  
Resistance System ◽  
Persistant Organic Pollutants ◽  
Potential Applicability

Biologically activated sorbent (BAS) are believed to be more efficient than separate conventional activated sludge and sorbents systems in removing phenols and others persistant organic pollutants from wastewater. These days, applications of biological activated systems treatment for various kinds of industrial wastewater are attracting greater attention as one of the efficient technologies. But the process is not very good understood, and there is not much parameter, which could describe stability and reliability of system and which could compare different BAS systems. The aim of this study was to investigate the resistance of different biologically activated sorbents to inhibition using respirometric measurements. To choose the most resistant to inhibition biologically activated system from five BAS: BAS-A, BAS-B, BAS-C, BAS-D and conventional activated sludge for comparing. Also to evaluate potential applicability of respirometric method for monitoring bioactivity in BAS systems. The pesticide 3,5-dichlorenol was chosen as inhibitor compound for experiment. The respiratory inhibition measurements were done with different biologically activated systems using different concentration of pesticide. The experiment was accomplished using respiratory inhibition method which described in Lithuanian normative document for environmental protection (Land 45-2001): activated sludge respiratory inhibition test. In parallel saprophyte bacterial counts were determined by spread plate technique and calculated as amount of saprophyte in one litter. The results from both tests showed that the most resistance system to respiratory inhibition was BAS-A. Respirometric method is applicable for monitoring bioactivity in BAS systems.

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