progress report

Running head: RESEARCH PROPOSAL ON EFFECTS OF CORROSION IN SEWER SYSTEMS 1

RESEARCH PROPOSAL ON EFFECTS OF CORROSION IN SEWER SYSTEMS 8

RESEARCH PROPOSAL ON EFFECTS OF CORROSION IN SEWER SYSTEMS 9

RESEARCH PROPOSAL ON EFFECTS OF CORROSION IN SEWER SYSTEMS

Laurence Anaelle Angue Ngoua

University of Houston Downtown

March 26, 2021

Abstract

Environmental pollution of sewage and sewage treatment plants is a major problem and its resources contribute to the deficit of billions of dollars per year (Jiang et al., 2015). For the most part it is known that the use of cement produced by microorganisms is related to its formation of sulfuric acid as a basic metabolism. The circulation of bacteria promotes the development of the sulfur cycle in the framework, after which sulfuric acid is synthesized, the presence of which results in the use of cement (Jiang et al., 2014). In addition, the presence of a wide variety of organisms, for example, microbes, growths and natural acids alike can contribute to the reduction of hardening.

Introduction

In the collection of organic and chemical compounds in the sewage system and in sewer pipes, four basic elements of cement reduction can be identified. These are mainly attacked by acids (biogenic acids), carbonation, chloride use and sulfide attacks. This paper will simply present a tool initiated by biogenic acid attacks (Jensen, 2009). Acids respond concrete with a basic response (balance). Acid climate in offices is sulfuric or also damages nitric. The former is formed by the bacterial activity of sulfur due to the reaction of hydrogen sulfide, water and air (Jiang et al., 2015). In the latter case, it is built on the function of small nitrogen compounds and the reaction of nitrates, water and air.

The speed of the balance depends on the basic conversion of the destructive material and the destructive type. Solid glue in concrete is basic, usually starting with a pH above 12.5 (Jensen, 2009). Following an article on acids or decay preparations, concrete begins to react with decay to bring out solvent-water salts (Grengg et al., 2015). These are mainly calcium salts. Harmful attacks cause the deterioration of the hardened concrete and the piece of material that does not melt. The effect of acids on the total content of the substance depends on its nature and the nature of the substance. Indeed, the total amount of dissolved dolomite-like structure as a rule is declining more slowly than concrete. In addition, metal support cannot protect itself from the effects of strong weather. The painted work of the weaker interest will be illustrated by the event of rust (the use of constructive metal), cracking and scattering of concrete (Wu et al., 2018). With a strong decontamination function, there are no breaks in solid or spalling and total free values ​​remain there.

The speed of the acid attack depends on the type, quantity and intensity (pH) of the damage, such as visible parameters such as repetition or length of exposure, temperature, distribution rates, etc. Then again, in the case of a torrent, the work of the destructive element may be suppressed by the destruction of the solid. As a result of the destructive concrete attack, the reaction mixture is highly saturated with calcium sulfate or gypsum, which is released by hand under dispersal conditions.

Initially, gypsum closes the mineral material, and in these lines increases its cohesion. Concrete also reacts with various concrete elements, and especially those that contain aluminum in their arrangement. The concrete is not self-supporting against the destructive activity it has broad steps tricalcium aluminate (C3A) on the concrete. This compound reacts with sulfate particles to produce calcium sulphoaluminate or ettringite (Jensen, 2009). With the expansion of the gemstone, pressure occurs resulting in a breakdown of the gemstones until the material is completely broken.

During crystallization, ettringite increases its volume depending on the volume of the substrates. This cycle causes inflammation and basically, the joints explode within it. A slight improvement in ettringite can also be considered. In the final stage, the separation of the outer layer is possible. High concentrations of sulfates often lead to widespread dehydration. Under non-circulating conditions, the sulfate attack will have less force unless the concentration of the sulfate itself is high. In any case, in real cases sulphate activity can improve rapidly due to the fact that the climate continues to be regenerated (Grengg et al., 2015). Concrete is then regularly introduced into the new river of destructive weather. In addition, regular replacement wetting and drying is possible. The basic sign of sulfate attack with small breaks in concrete glue. These breaks then create and grow as the attack progresses. In the final cycle of corruption, the solids collapse into powder, and the exposed areas are exposed to the ravages of the destructive weather.

Due to the microbial activity and the destructive nitrate formulation by them, the pH value in the nitrification tank remains at a scale of 6.6-7.5. Alternatively, lower pH is formed at a higher level, which is related to the destructive creation and the effect of bulking on the solid-coated nitrification biofilm. Such destructive work causes incomplete damage and weakens the concrete glue that causes the surface roughness to deteriorate. As a result, the strength of the support cover may decrease along the strength of the construction. The level of corruption depends on the degree of resilience. Solid hardening exposes the construction of a trademark to a higher level, for example glued glue or a thick layer of calcite formed near the surface occurs. This layer is formed due to the reaction between solid calcium oxide and CO2 which transports from nitrogen biofilm to solid. The lightened, permitted layer of silica gel at a higher level and the calcite layer reduces the proportions of the dispersion. Therefore, they act as antibodies to the invading carbon dioxide, which contributes to the increased ban on the train.

Statement of problem

The durability of concrete designs can be reduced by many metals, including composite and physical materials. Concrete in a sewage treatment plant can be exposed to the synchronizing effect (simultaneously) of these substances without a rapid blue discharge. The material in various parts of the sewage plant may be introduced into a sulfuric corrosive composed of microorganisms, sulfates and chlorides - containing water, constant immersion in water and constant flow, such as fluctuating cold temperatures and dehydration. The occurrence of such conditions can cause problems in concrete, including the dispersion of concrete, full scale and small breaks, such as cracks and decay of the supporting metal. This study is designed to examine the biological system. Environmental erosion in sewage treatment plants is brought about by the destructive release (metabolic effects) of bacteria. The winning conditions there are usually very good at advancing very small things. Medicinal plants are almost never completely filled with sewage and therefore there is a ton above the water line the evolution of bacterial events and development as well as the accumulation of gases from sewage. Due to the unusual rate of infection, large numbers were set up in a short period of time, making great risk to the facility.

Methodology

This research shall be conducted in the sewage or fecal sludge treatment plant. Concrete pipes, through which the sewage flow through shall also be analyzed.in the treatment plant, the existing metal pipe shall be replaced with new one including the concrete pipes. Before the new pipe being fixed, its new strengths shall be measured. It’s expected that it will take two years after being fixed after which the strength shall be analyzed again. A decrease in strength is expected.

Budget

The resources to be used are included in the budget below.

S/NO	Item	No. of item	Cost per item ($)	Total cost ($)
1	8’ Black steel pipe	10	60	600
2	M10 bolts and nuts	200	2	400
3	Silicon	5L	5	25
4	gasket			200
2	1’ concrete pipe	4	150	600
5	Transport			300
6	Labor	5	4000	20000
	Total	22,125

Qualification

What makes me feel that I can bring solution to the rampant failure of sewage systems due to corrosion is that I have been working in a sewage treatment plant for 6 years and I have witnessed failures which occurs due to corrosion and the idea which I have explained above if executed, can help reduced the corrosion effects on sewage systems.

References

GRENGG, C., MITTERMAYR, F., BALDERMANN, A., BÖTTCHER, M. E., LEIS, A., KORAIMANN, G., GRUNERT, P. & DIETZEL, M. 2015. Microbiologically induced concrete corrosion: A case study from a combined sewer network. Cement and Concrete Research, 77, 16-25.

JENSEN, H. S. 2009. Hydrogen sulfide induced concrete corrosion of sewer networks, Institut for Kemi, Miljø og Bioteknologi, Aalborg Universitet.

JIANG, G., SUN, J., SHARMA, K. R. & YUAN, Z. 2015. Corrosion and odor management in sewer systems. Current opinion in biotechnology, 33, 192-197.

JIANG, G., WIGHTMAN, E., DONOSE, B. C., YUAN, Z., BOND, P. L. & KELLER, J. 2014. The role of iron in sulfide induced corrosion of sewer concrete. Water research, 49, 166-174.

WELLS, P. & MELCHERS, R. E. Microbial corrosion of sewer pipe in Australia-initial field results. 18th International Corrosion Congress Proceedings November, 2011. Citeseer.

WU, L., HU, C. & LIU, W. V. 2018. The sustainability of concrete in sewer tunnel—A narrative review of acid corrosion in the city of Edmonton, Canada. Sustainability, 10, 517.

Appendix

Gantt Chart

Start date Collection of materials Fixing new pipes monitoring and evaluation Analysis of pipes Report writing 44275 44281 44293 44508 44523 Duration(Days) Collection of materials Fixing new pipes monitoring and evaluation Analysis of pipes Report writing 5 10 240 14 30