Transformation of organic matters in sewage during A2O and soil aquifer treatment processes

2019 ◽  
Vol 75 (7) ◽  
pp. III_41-III_52
Author(s):  
Fumitake NISHIMURA ◽  
Ryosuke SUZUKI ◽  
Yugo TAKABE ◽  
Taira HIDAKA ◽  
Yasunari KUSUDA ◽  
...  
Keyword(s):  
Soil Aquifer Treatment ◽  
Organic Matters ◽  
Treatment Processes

Comprehensive assessment of precursors, diagenesis, and reactivity to water treatment of dissolved and colloidal organic matter

2004 ◽  
Vol 4 (4) ◽  
pp. 1-9 ◽  
Author(s):  
J.A. Leenheer
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Condensed Tannins ◽  
Drinking Water Treatment ◽  
Amino Sugar ◽  
Amino Sugars ◽  
Research Approach ◽  
Soil Aquifer Treatment ◽  
Treatment Processes ◽  
High Yields

A comprehensive isolation, fractionation, and characterization research approach was developed for dissolved and colloidal organic matter (DOM) in water, and it was applied to various surface- and groundwaters to assess DOM precursors, DOM diagenesis, and DOM reactivity to water treatment processes. Major precursors for natural DOM are amino sugars, condensed tannins, and terpenoids. Amino sugar colloids derived from bacterial cell walls are incompletely removed by drinking water treatment and foul reverse osmosis membranes, but are nearly quantitatively removed by soil/aquifer treatment. When chlorinated, amino sugars produce low yields of regulated disinfection by-products (DBPs) but they produce significant chlorine demand that is likely caused by chlorination of free amino groups. Condensed tannins are major precursors for ,blackwater- DOM such as that found in the Suwannee River. This DOM produces high yields of DBPs upon chorination, and is efficiently removed by coagulation/flocculation treatment. Terpenoid-derived DOM appears to be biologically refractory, infiltrates readily into groundwater with little removal by soil/aquifer treatment, gives low DBP-yields upon chlorination and is poorly removed by coagulation/flocculation treatments. Peptides derived from proteins are major components of the base DOM fraction (10% or less of the mass of DOM), and this fraction produces large yields of haloacetonitriles upon chorination.

Kinetics of the reaction of hypobromous acid and organic matters in water treatment processes

2006 ◽  
Vol 53 (11) ◽  
pp. 235-243 ◽  
Author(s):  
S. Echigo ◽  
R.A. Minear
Keyword(s):  
Water Treatment ◽  
Organic Matters ◽  
Reaction Phase ◽  
Treatment Processes ◽  
Kinetic Information ◽  
Hypobromous Acid ◽  
Bromination Reaction ◽  
Natural Organic Matters ◽  
Kinetics Of ◽  
Reaction In Water

The fate of bromine species from human activity is affected by the bromination reaction in water treatment processes. In this study, kinetic information of the reaction between hypobromous acid (HOBr) and seven different natural organic matters (NOM) was collected by sequential stopped-flow techniques. Multiple reaction phases were found in the reaction between HOBr and NOM. The number of reaction sites for the faster reaction phase ranged from 0.26 to 0.92 μmole (mg DOC)−1, and was correlated to both SUVA and specific phenolic content at pH 7.0. The apparent second-order rate constants for the faster reaction phase at pH 7.0 ranged from 5.4 × 105 to 1.4 × 106 M−1·s−1, indicating that vanillin-like structures are involved in this reaction phase.

Progress in the Application of Refractory Dyeing Wastewater Treatment Processes

2012 ◽  
Vol 246-247 ◽  
pp. 635-639
Author(s):  
Jie Yang
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Dyeing Wastewater ◽  
Treatment Technology ◽  
Water Shortages ◽  
Organic Matters ◽  
Treatment Processes ◽  
Treatment Technologies ◽  
Quality Water ◽  
New Treatment

The state and progress in the treatment technology of dyeing wastewater are summarized in this paper, especially the new treatment technologies coming about in the latest years. The developing trend of treatment for organic matters is discussed as well. In the meantime, regional and water-quality water shortages have also been proven to be the bottlenecks for imposing restrictions on the development of the society and economy after land and energy.

Formation of THMs, Microcystin-LR and Odors from Microcystis aeruginosa - Derived Organic Matter

2014 ◽  
Vol 1051 ◽  
pp. 348-352 ◽  
Author(s):  
Huan Wang ◽  
Dong Mei Liu ◽  
Peng Wang ◽  
Fu Yi Cui
Keyword(s):  
Organic Matter ◽  
Growth Phase ◽  
Drinking Water Treatment ◽  
Disinfection Byproducts ◽  
Exponential Phase ◽  
Lag Phase ◽  
Phase Lag ◽  
Organic Matters ◽  
Treatment Processes ◽  
Death Phase

Algogenic organic matter (AOM), including extracellular organic matters (EOM) and intracellular organic matters (IOM) can interfere with drinking water treatment processes and cause water quality problems, among which the formation of disinfection byproducts (DBPs), microcystins and odor and taste compounds are of particular concern. In this study, the formations of THMs, Microcystins-LR and 2-MIB during four growth phase (lag phase, exponential phase, stationary phase and death phase) were investigated. The THMs formation potential of EOM and IOM were compared. Higher CHCl3 concentration was found in IOM than that in EOM. In the presence of bromide, more brominated-THMs generated, and the TTHMs increased more rapidly in EOM than IOM. The 2-MIB was found a similar trend with the MC-LR in the four growth phase. The total 2-MIB was gradually increased as a function of the time. The formation of MC-LR and 2-MIB depended on algae density.

Phenols, flame retardants and phthalates in water and wastewater – a global problem

2016 ◽  
Vol 74 (5) ◽  
pp. 1025-1038 ◽  
Author(s):  
Olushola Sunday Ayanda ◽  
Godwin Oladele Olutona ◽  
Emmanuel G. Olumayede ◽  
Cecilia O. Akintayo ◽  
Bhekumusa J. Ximba
Keyword(s):  
Organic Pollutants ◽  
Flame Retardants ◽  
Combined Treatment ◽  
Endocrine System ◽  
Environmental Problems ◽  
Organic Matters ◽  
Global Problem ◽  
Treatment Processes ◽  
Water And Wastewater ◽  
By Products

Organic pollutants in water and wastewater have been causing serious environmental problems. The arbitrary discharge of wastewater by industries, and handling, use, and disposal constitute a means by which phenols, flame retardants (FRs), phthalates (PAEs) and other toxic organic pollutants enter the ecosystem. Moreover, these organic pollutants are not completely removed during treatment processes and might be degraded into highly toxic derivatives, which has led to their occurrence in the environment. Phenols, FRs and PAEs are thus highly toxic, carcinogenic and mutagenic, and are capable of disrupting the endocrine system. Therefore, investigation to understand the sources, pathways, behavior, toxicity and exposure to phenols, FRs and PAEs in the environment is necessary. Formation of different by-products makes it difficult to compare the efficacy of the treatment processes, most especially when other organic matters are present. Hence, high levels of phenols, FRs and PAEs removal could be attained with in-line combined treatment processes.

DECOLOURIZATION AND COD REMOVAL OF WASEWATER FROM ETHANOL PRODUCTION PROCESS FROM MOLASSES BY COAGULANTION USING INORGANIC ALUM

2010 ◽  
Vol 13 (3) ◽  
pp. 92-102
Author(s):  
Trung Duc Le
Keyword(s):  
Ethanol Production ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Treated Wastewater ◽  
Treatment Processes ◽  
Physico Chemical ◽  
Biological Methods ◽  
Treatment Step ◽  
Main Material

The industrial production of ethanol by fermentation using molasses as main material that generates large quantity of wastewater. This wastewater contains high levels of colour and chemical oxygen demand (COD), that may causes serious environmental pollution. Most available treatment processes in Vietnam rely on biological methods, which often fail to treat waste water up to discharge standard. As always, it was reported that quality of treated wastewater could not meet Vietnameses discharge standard. So, it is necessary to improve the treatment efficiency of whole technological process and therefore, supplemental physico-chemical treatment step before biodegradation stage should be the appropriate choice. This study was carried out to assess the effect of coagulation process on decolourization and COD removal in molasses-based ethanol production wastewater using inorganic coaglutant under laboratory conditions. The experimental results showed that the reductions of COD and colour with the utilization of Al2(SO4)3 at pH 9.5 were 83% and 70%, respectively. Mixture FeSO4 – Al2(SO4)3 at pH 8.5 reduced 82% of colour and 70% of COD. With the addition of Polyacrylamide (PAM), the reduction efficiencies of colour, COD and turbidity by FeSO4 – Al2(SO4)3 were 87%, 73.1% and 94.1% correspondingly. It was indicated that PAM significantly reduced the turbidity of wastewater, however it virtually did not increase the efficiencies of colour and COD reduction. Furthermore, the coagulation processes using PAM usually produces a mount of sludge which is hard to be deposited.

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