scholarly journals Investigation on Sediment Treatment in a Heavily-Polluted River, China

2019 ◽  
Author(s):  
Senjun Huang ◽  
Jun Wei ◽  
Heng Zheng ◽  
Jianqiang Xu ◽  
Wei Zhao ◽  
...  
Keyword(s):  
Polluted River ◽  
Sediment Treatment

Operation intensification methods of aggressive industrial sewage neutralization facilities

2020 ◽  
Vol 76 (11) ◽  
pp. 1149-1153
Author(s):  
N. S. Tsarev ◽  
V. I. Aksenov ◽  
I. I. Nichkova
Keyword(s):  
Cold Water ◽  
Specific Productivity ◽  
Technological Properties ◽  
Technological Parameters ◽  
Preliminary Heating ◽  
Sediment Treatment ◽  
Circulating Water ◽  
Equipment Operation ◽  
Sediment Volume ◽  
Industrial Sewage

To neutralize the waste pickling solutions and rinsing water, resulting from cleaning metal products s surface of rust by acids solutions, lime is used. Being cheap, this method of sewage neutralization has considerable drawbacks. Forming in the technological pipes strong gypsum depositions and low specific productivity of the equipment for sediment dewatering are most significant of them. Characteristic of aggressive industrial sewage, formed at pickling of ferrous metals presented. Methods of elimination of drawbacks of industrial sewage neutralization by lime considered, including stabilization of neutralized industrial sewage and control of properties of the sediment formed. It was noted, that stability of the circulating water can be provided by accelerating of crystallization of the forming gypsum sediments by introducing in it fine priming powder and heating the neutralized water up to 65-70 °С followed by thermal softening of a part of circulating water, removed out of the circulating system. It was shown, that the heating of the water and the ongoing changes of the composition and properties of the sediment result in decrease of filtration resistance 2-3 folds, increase of deposition speed 3-4 folds and decrease the sediment volume 1.5-2 folds comparing with lime neutralization in cold water. Calculated dozes of lime at the heating were taken the same as at the regular lime neutralization. Elimination of the circulating water oversaturation by bi-water gypsum can be reached also by addition into the water of powder-like gypsum pulp - priming powder for microcrystals of the gypsum, followed by aeration during 30-40 min. This method was tested under industrial conditions. Technological properties of the forming sediment can be improved by sediment treatment by flocculants and preliminary heating of the neutralized water up to 65-70 °С. Control of technological properties of the sediment is done by addition of flocculants and heating of the neutralized water. Recommendations for improving operation of the neutralization facilities presented with indicating particular technological parameters of the equipment operation for sewage and sediment treatment. 

Evaluation of Toxicity in Receiving Streams

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2357-2360
Author(s):  
J. Zagorc-Koncan ◽  
M. Dular
Keyword(s):  
Dissolved Oxygen ◽  
Toxic Substances ◽  
Toxicity Evaluation ◽  
Copper Cyanide ◽  
Polluted River ◽  
Design Information ◽  
Point Of Entry ◽  
Receiving Stream ◽  
The Impact

A laboratory river model for the study of self-purification inhibition in a stream containing toxic substances is presented. It enables an engineering - technological prediction of the impact of toxic substances or wastewaters on dissolved oxygen (DO) profile in an organically polluted river downstream from the point of entry of toxic effluent thus providing rapidly and inexpensively significant design information to an environmental scientist or engineer. The method was applied to the toxicity evaluation of wastewaters from electroplating industry. The effects of copper, cyanide (representing two significant constituents of this type of wastewaters) and wastewater from electroplating industry on the biodegradation of organic municipal pollution in receiving stream were evaluated experimentally.

Nitrogen removal from polluted river water in a novel ditch–wetland–pond system

2013 ◽  
Vol 60 ◽  
pp. 135-139 ◽  
Author(s):  
Wenzhong Tang ◽  
Wenqiang Zhang ◽  
Yu Zhao ◽  
Yuanyue Wang ◽  
Baoqing Shan
Keyword(s):  
River Water ◽  
Nitrogen Removal ◽  
Polluted River ◽  
Pond System

scholarly journals Status of multielement in water of the river Buriganga, Bangladesh: Aquatic chemistry of metal ions in polluted river water

2021 ◽  
Vol 7 ◽  
pp. 99-115
Author(s):  
Aklima Nargis ◽  
Ahsan Habib ◽  
Harun-Or-Rashid ◽  
Halima Binte Harun ◽  
Md Shafiqul Islam Sarker ◽  
...  
Keyword(s):  
Metal Ions ◽  
River Water ◽  
Aquatic Chemistry ◽  
Polluted River

Large-scale hybrid accidental urban wetland for polluted river purification in northern China: Evidence and implications for urban river management

2021 ◽  
Vol 22 ◽  
pp. 101542 ◽  
Author(s):  
Mathieu Nsenga Kumwimba ◽  
Xinzhu Li ◽  
Wei wang ◽  
L.H.D.K.U. De Silva ◽  
Linlin Bao ◽  
...  
Keyword(s):  
Large Scale ◽  
Northern China ◽  
River Management ◽  
Urban River ◽  
Polluted River ◽  
Urban Wetland

Yeasts isolated from the South Saskatchewan, a polluted river

1970 ◽  
Vol 16 (11) ◽  
pp. 1051-1057 ◽  
Author(s):  
J. F. T. Spencer ◽  
P. A. J. Gorin ◽  
N. R. Gardner
Keyword(s):  
Magnetic Resonance ◽  
The South ◽  
Polluted River ◽  
Sewage System ◽  
Minimum Numbers ◽  
The City ◽  
Magnetic Resonance Spectra

Minimum numbers of yeasts isolated from the Saskatchewan River in the summers of 1964 and 1965 ranged from 400 to 500 cells/liter upstream from the city of Saskatoon, to 4600 cells/liter immediately downstream. In the summer of 1968, a period of extremely low water, the counts were 150 cells/liter upstream from the city and 30 000 cells/liter downstream.Proton magnetic resonance spectra of the mannose-containing polysaccharides from representative cultures of the different species isolated were used as an aid in classification. Most of the species were asporogenous, and included representatives of the genera Candida, Trichosporon, Rhodotorula, Torulopsis, and Cryptococcus. Some species of Pichia, Saccharomyces, and Debaryomyces were isolated. The yeasts were mostly introduced into the river with the effluent from the Saskatoon sewage system.

scholarly journals DIRECT TREATMENT OF POLLUTED RIVER WATER BY THE MULTI-SOIL-LAYERING METHOD

2003 ◽  
Vol 1 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Tsuigiyuki Masunaga ◽  
Kuniaki Sato ◽  
Takayuki Zennami ◽  
Syunitsu Fujii ◽  
Toshiyuki Wakatsuki
Keyword(s):  
River Water ◽  
Polluted River ◽  
Direct Treatment ◽  
Soil Layering

scholarly journals A laboratory study to determine the use of polluted river sediment as a substrate for extensive green roofs

2018 ◽  
Vol 78 (11) ◽  
pp. 2247-2255 ◽  
Author(s):  
Wei Zhang ◽  
Xing Zhong ◽  
Wu Che ◽  
Huichao Sun ◽  
Hailong Zhang
Keyword(s):  
River Sediment ◽  
Peat Soil ◽  
River Sediments ◽  
Green Roof ◽  
Oxygen Demand ◽  
Green Roofs ◽  
Polluted River ◽  
Artificial Rainfall ◽  
Study Laboratory ◽  
Extensive Green Roofs

Abstract In this study, laboratory-scale green (e.g. living) roof platforms were established to assess the potential use of polluted river sediment in their substrate mixture. The mean runoff retention of the green roof platforms, which contained peat and/or river sediment, after 11 artificial rainfall events was >72%, significantly higher than traditional roofs. However, green roof platforms that had been filled with peat soil showed chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) leaching. Green roofs that had used river sediment showed good leaching control for COD, TN and TP. The cumulative leaching masses from the green roofs contained 30% (COD), 42% (TN) and 47% (TP) as much as the total leaching mass from traditional roofs, and the Cu, Zn, Cd and Pb leaching risk from green roofs when river sediments are used as part of a substrate mixture was relatively low. Despite some nutrient leaching in the initial phase of runoff from the green roofs, river sediment has the potential to be used as a substrate for extensive green roofs.

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