scholarly journals In situ Remediation Technologies Associated with Sanitation Improvement: An Opportunity for Water Quality Recovering in Developing Countries

10.5772/32068 ◽  
2012 ◽  
Author(s):  
Davi Gasparini Fernandes Cunha ◽  
Maria do Carmo Calijuri ◽  
Doron Grull ◽  
Pedro Caetano Sanches Mancuso ◽  
Daniel R.
Keyword(s):  
Water Quality ◽  
Developing Countries ◽  
In Situ Remediation

scholarly journals Shift of Sediments Bacterial Community in the Black-Odor Urban River during In Situ Remediation by Comprehensive Measures

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2129 ◽  
Author(s):  
Jian Zhang ◽  
Yun Tang ◽  
Zhanguo Kou ◽  
Xiao Teng ◽  
Wei Cai ◽  
...  
Keyword(s):  
Water Quality ◽  
Bacterial Community ◽  
Organic Pollutants ◽  
In Situ Remediation ◽  
Sediment Remediation ◽  
Overlying Water ◽  
Rapid Urbanization ◽  
Associated Bacteria

The phenomenon of black-odor urban rivers with rapid urbanization has attracted extensive attention. In this study, we investigated the water quality and composition of sediment-associated bacteria communities in three remediation stages (before remediation, 30 days after remediation, and 90 days after remediation) based on the in situ remediation using comprehensive measures (physical, chemical, and biological measures). The results show that the overlying water quality was notably improved after in situ remediation, while the diversity and richness of sediment-associated bacterial communities decreased. A growing trend of some dominant genus was observed following the remediation of a black-odor river, such as Halomonas, Pseudomonas, Decarbonamis, Leptolina, Longilina, Caldiseericum, Smithella, Mesotoga, Truepera, and Ralstonia, which play an important role in the removal of nitrogen, organic pollutants and hydrogen sulfide (H2S) during the sediment remediation. Redundancy analysis (RDA) showed that the bacterial community succession may accelerate the transformation of organic pollutants into inorganic salts in the sediment after in situ remediation. In a word, the water quality of the black-odor river was obviously improved after in situ remediation, and the bacterial community in the sediment notably changed, which determines the nutrients environment in the sediment.

scholarly journals The effect of ecological restoration based artificial reoxygenation on water quality Improvement of urban river water

2018 ◽  
Vol 246 ◽  
pp. 02037
Author(s):  
Nan Luo ◽  
Changying Hu ◽  
Weiyu Li ◽  
Tao Xie ◽  
HuiLi Gong ◽  
...  
Keyword(s):  
Water Quality ◽  
Ammonium Nitrogen ◽  
Urban River ◽  
In Situ Remediation ◽  
Quality Degradation ◽  
Total Phosphorous ◽  
Filter Bed ◽  
Microbial Agents

Urban river pollution sources such as Combined Sewer Overflows (CSOs) or Illegally Discharging of Industrial Waste (IDIW) are generally hard to control on-site and cause serious water quality degradation problems across the nation. Therefore developing effective in-situ remediation techniques for urban rivers is of great interest. In this research we combined river reoxygenation, artificial floating island and microbial agents technologies (O-AFI-MA) to developed a comprehensive in-situ remediation technique and obtained water quality data from Sunhe River case study to evaluate its effectiveness. Our discovery indicates that the O-AFI-MA technique effectively improves water quality by reducing chemical oxygen demand (CODCr), total phosphorous (TP), ammonium nitrogen (NH4+-N) level by 45.9%, 61.31, 7.66% respectively and our technique enhances the natural degradation rate by raising the dissolved oxygen (DO) level from 2.8mg/L to 10mg/L upstream. The case study suggests that the sediment accumulation from CSOs and the subsequent internal source release causes great water quality degradation for Sunhe River. We also tested combinatory microbial agents, physical adsorption and multimedia bio-filter bed technologies independently on site to improve the ammonium nitrogen and total phosphorous removal rate of our technique, and the multimedia bio-filter bed is found to be most effective.

Development of Simulators for In Situ Remediation Evaluation, Design, and Operation

2001 ◽  
Author(s):  
Mark S. Dortch ◽  
Christian J. McGrath ◽  
John J. Nitao ◽  
Mark A. Widdowson ◽  
Steve Yabusaki
Keyword(s):  
In Situ Remediation ◽  
Evaluation Design

In Situ Remediation of Explosives Contaminated Ground-Water with Sequential Reactive Treatment Zones

2001 ◽  
Author(s):  
Paul G. Tratnyek ◽  
Richard L. Johnson ◽  
Timothy L. Johnson ◽  
Rosemarie Miehr
Keyword(s):  
Ground Water ◽  
In Situ Remediation

Water Quality and Health

1991 ◽  
Vol 23 (1-3) ◽  
pp. 201-209 ◽  
Author(s):  
W. Kreisel
Keyword(s):  
Water Quality ◽  
Developing Countries ◽  
Drinking Water ◽  
Water Supply ◽  
Human Health ◽  
Pollution Control ◽  
Wastewater Reuse ◽  
Water Supplies ◽  
Minimum Quality Standards ◽  
Quality Guidelines

Water quality can affect human health in various ways: through breeding of vectors, presence of pathogenic protozoa, helminths, bacteria and viruses, or through inorganic and organic chemicals. While traditional concern has been with pathogens and gastro-intestinal diseases, chemical pollutants in drinking-water supplies have in many instances reached proportions which affect human health, especially in cases of chronic exposure. Treatment of drinking-water, often grossly inadequate in developing countries, is the last barrier of health protection, but control at source is more effective for pollution control. Several WHO programmes of the International Drinking-Water Supply and Sanitation Decade have stimulated awareness of the importance of water quality in public water supplies. Three main streams have been followed during the eighties: guidelines for drinking-water quality, guidelines for wastewater reuse and the monitoring of freshwater quality. Following massive investments in the community water supply sector to provide people with adequate quantities of drinking-water, it becomes more and more important to also guarantee minimum quality standards. This has been recognized by many water and health authorities in developing countries and, as a result, WHO cooperates with many of them in establishing water quality laboratories and pollution control programmes.

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