Experimental research and prediction of the effect of chemical and biogenic sulfuric acid on different types of commercially produced concrete sewer pipes

2004 ◽  
Vol 34 (12) ◽  
pp. 2223-2236 ◽  
Author(s):  
N. De Belie ◽  
J. Monteny ◽  
A. Beeldens ◽  
E. Vincke ◽  
D. Van Gemert ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Experimental Research ◽  
Sewer Pipes ◽  
Different Types

Biogenic sulfuric acid attack on different types of commercially produced concrete sewer pipes

2010 ◽  
Vol 40 (2) ◽  
pp. 293-301 ◽  
Author(s):  
Ma. Guadalupe D. Gutiérrez-Padilla ◽  
Angela Bielefeldt ◽  
Serguei Ovtchinnikov ◽  
Mark Hernandez ◽  
Joann Silverstein
Keyword(s):  
Sulfuric Acid ◽  
Acid Attack ◽  
Sewer Pipes ◽  
Different Types

Sulfate Attack on Different Types of Concrete in Media Simulating Sewer System

2016 ◽  
Vol 714 ◽  
pp. 122-127
Author(s):  
Martin Vyšvařil ◽  
Markéta Rovnaníková ◽  
Patrik Bayer
Keyword(s):  
Waste Water ◽  
Sulfuric Acid ◽  
Sewage Water ◽  
Sulfate Attack ◽  
Acid Attack ◽  
Bottom Part ◽  
Sewer Pipes ◽  
Fine Grained ◽  
Different Types ◽  
One Year

The degradation of concrete due to ingress of sulfate ions from the environment plays an important role in the durability of concrete constructions. Microbiologically induced concrete corrosion (MICC) damages especially sewage collection systems. The most rapid cases of deterioration always occur in areas with elevated H2S concentrations, moisture, and oxygen in the atmosphere. During the MICC, the pH of the surface of concrete sewer pipes is reduced and it may lead to the steel depassivation and results in the corrosion of steel reinforcement. Damage due to a sulfate interaction can result in a cracking and softening, with a loss of strength of concrete. The formation of ettringite (AFt) from gypsum (forming by reaction of sulfate anion with calcium hydroxide) and C3A via monosulfate (AFm) is the main chemical reaction of sulfate attack on concrete. Ettringite and gypsum have considerably larger volume than initial compounds, which leads to increased pressure in concrete. This paper is focused on the sulfate attack on fine-grained concrete where the effect of 0.5% sulfuric acid, simulating MICC, and a solution simulating sewage water has been investigated on changes of the pH, content of sulfates and the porosity in various types of concrete. The aim of this study is to compare the changes in different types of concrete during the sulfate attack in two kinds of medium represented the bottom part of pipelines (waste water) and the sewer crown (0.5% H2SO4). It was found, that after 1 year in 0.5% H2SO4, a visible degradation of surface occurs in all investigated types of concrete. Samples over the year in waste water became dark. Concentration of sulfates in all studied types of concrete increased six times at least after one year sulfuric acid attack and also the reduction of the pH of their aqueous leaches was determined. The solution simulating sewage water did not cause such changes.

The Impact of the Industrial Processing of Oil on the Rainfall Water Quality

2017 ◽  
Vol 68 (1) ◽  
pp. 175-179
Author(s):  
Oana Roxana Chivu ◽  
Augustin Semenescu ◽  
Claudiu Babis ◽  
Catalin Amza ◽  
Gabriel Iacobescu ◽  
...  
Keyword(s):  
Water Quality ◽  
Sulfuric Acid ◽  
Experimental Research ◽  
Air Purification ◽  
High Toxicity ◽  
Industrial Processing ◽  
Mobile Sources ◽  
Specific Activities ◽  
The Impact ◽  
The Ideal

Rainfall is a major component of the environment and the main source of the air purification becouse of many pollutants increases who have the most varied sources: various human activities including industry and agriculture, and some household duties. Air purification by means of precipitation is achieved by numerous highly complex mechanisms. The final products of degradation of the pollutant in the air, which are generally harmless, can be reacted with each other in the presence of water, giving rise to the final compounds with a high toxicity. Thus, exhaust, mobile sources of noxious almost identical to those specific activities in the industrial processing of oil, contain lead which is the ideal catalyst for converting SO2 to sulfuric acid in the presence of rainwater, with all the disadvantages that they create. This paper will present an experimental research oabout how rainfall water quality is influenced by the activity of the industrial processing of oil, in a chemical plant in Constanta County.

scholarly journals Preliminary Study on Gold Recovery from High Grade E-Waste by Thiourea Leaching and Electrowinning

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 235
Author(s):  
Nicolò Maria Ippolito ◽  
Ionela Birloaga ◽  
Francesco Ferella ◽  
Marcello Centofanti ◽  
Francesco Vegliò
Keyword(s):  
Sulfuric Acid ◽  
Leach Solution ◽  
High Grade ◽  
Gold Dissolution ◽  
Plastic Part ◽  
The Third ◽  
Current Consumption ◽  
Different Types ◽  
Preliminary Study ◽  
A Current

The present paper is focused on the extraction of gold from high-grade e-waste, i.e., spent electronic connectors and plates, by leaching and electrowinning. These connectors are usually made up of an alloy covered by a layer of gold; sometimes, in some of them, a plastic part is also present. The applied leaching system consisted of an acid solution of diluted sulfuric acid (0.2 mol/L) with thiourea (20 g/L) as a reagent and ferric sulfate (21.8 g/L) as an oxidant. This system was applied on three different high-grade e-waste, namely: (1) Connectors with the partial gold-plated surface (Au concentration—1139 mg/kg); (2) different types of connectors with some of which with completely gold-plated surface (Au concentration—590 mg/kg); and (3) connectors and plates with the completely gold-plated surface (Au concentration—7900 mg/kg). Gold dissolution yields of 52, 94, and 49% were achieved from the first, second, and third samples, respectively. About 95% of Au recovery was achieved after 1.5 h of electrowinning at a current efficiency of only 4.06% and current consumption of 3.02 kWh/kg of Au from the leach solution of the third sample.

Experimental Research on Bonding Intensity of Iron Ores in the Sintering Process

2011 ◽  
Vol 391-392 ◽  
pp. 60-64
Author(s):  
Fang Yi Long ◽  
Sheng Li Wu ◽  
Juan Zhu ◽  
Yuan Du ◽  
Guo Liang Zhang
Keyword(s):  
South Africa ◽  
Liquid Phase ◽  
Experimental Research ◽  
Negative Correlation ◽  
Influence Factors ◽  
Iron Ores ◽  
Sintering Process ◽  
Different Types ◽  
Lower Porosity

The bonding intensity of four kinds of ores from Brazil, Australia and South Africa is researched in this study, and the influence factors are analyzed. The results show that, the ores of different types have apparently differences in bonding intensity, ores from Brazil and South Africa have high bonding intensity, while ores from Australia have low bonding intensity; The foundation of generation of effective liquid is adequate liquid phase fluidity and the lower porosity of core ore; The ratio of porosity of core ore and the index of liquid phase fluidity has negative correlation with the bonding intensity.

Karakteristik Mazmur Pujian

2021 ◽  
Vol 1 (2) ◽  
pp. 155-164
Author(s):  
Darto Sachius
Keyword(s):  
Research Methods ◽  
Experimental Research ◽  
Qualitative Method ◽  
Second Step ◽  
Hebrew Poetry ◽  
The Third ◽  
Original Meaning ◽  
Language Style ◽  
Different Types

The study is titled characteristics Psalm of Praise. This study will seek and discover the characteristics and principles of psalm praise in the Book of Psalms. To discover the characteristics of the Praise Psalm used qualitative rather than experimental research methods. This qualitative method can also be used for reflective speculators. With four steps: analyzing the passage according to its elements, the second step is to recognize the language style of poetry and stories that are historical, the third reveals the original meaning of Hebrew poetry, the fourth looks for the characteristics of the Hebrew satra of the author's motives and goals. So that preserved by this method can be formulated characteristics from the Psalm of Praise. There are three important things to remember in the Psalm of praise is, first the Psalm of praise begins with an invitation to worship The Lord, The second psalm of praise continues by giving a description of the reasons why God is worthy of praise. Third is the psalm praise usually includes and sometimes ends with a further invitation to praise God therefore the proper title is the characteristics Psalm of Praise so that the awkwardness of distinguishing the interpretation of different types of psalm can be well cleared.

Experimental Research on Damage to Fracture Conductivity Caused by Fracturing Fluid Residues

2013 ◽  
Vol 774-776 ◽  
pp. 303-307
Author(s):  
Lei Wang
Keyword(s):  
Experimental Research ◽  
Evaluation System ◽  
Fracturing Fluid ◽  
Fracture Conductivity ◽  
Fracturing Fluids ◽  
Different Types ◽  
Degree Of Damage ◽  
First Time

Experimental research on damage to fracture conductivity caused by fracturing fluid residues has been done for the first time in China using FCES-100 (Fracture Conductivity Evaluation System). In the experiments, the degree of damage to conductivity caused by different types and concentrations of fracturing fluids were studied in the condition of different concentrations and types of proppants. The mechanism of damage to conductivity was studied and some methods on how to decrease the damage were brought forward, which is significant for the research on development of fracturing fluids and also for field treatments.

Experimental research on free settling properties of different types of single fiber particle in air

2020 ◽  
Vol 185 ◽  
pp. 107300
Author(s):  
Xiaoni Yang ◽  
Yi Wang ◽  
Honggang Yang ◽  
Yang Yang
Keyword(s):  
Experimental Research ◽  
Single Fiber ◽  
Different Types
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