Complementary Assets in the Methodology of Implementation Unified Information Model of the City Environment Project Life Cycle

2017

Abstract. This work is aimed at providing a deep cleaning from nitrogen and phosphorus at the requirements level for a small capacity waste water treatment plants with active sludge. The wastewater treatment technology includes: mechanical screen, anaerobic reactor, anoxic reactor, two aerobic reactors with floating media, aerobic reactor, clarifier, bioreactor, purification, filter, filter of tertiary treatment with the sorbent, ultraviolet disinfection facility. The sludge treatment includes aerobic stabilizer and facility of mechanical dewatering. The developed technology ensures deep purification of household waste waters from nitrogen and phosphorus. The degree of purification in the ammonium-ion reaches of 99.5 %. Efficiency of total nitrogen removal (the sum of ammonium, nitrite and nitrate nitrogen) is 85 %. The efficiency of biological purification of phosphates is 97.8 percent that is achieved without the use of coagulant. Requirements are met in most cases.

“…The concentration of dissolved oxygen in the aeration tanks that is above 2 mg/l has positive effect on the processes of nitrification [25][26][27][28].…”

Section: Resultsmentioning

confidence: 99%

Removal of nitrogen and phosphorous from domestic wastewater

Kulakov

2017

“…Table 1 show positive results of the application of immobilized activated sludge that allows increasing the dose of sludge in the aeration facility, which accordingly improves their oxidative capacity and creates favorable conditions for development and retention of specific slow-growing strains of microorganisms able to destruct various hardly oxidized contaminants [25][26][27]. Table 1.…”

Section: How To Reduce Amount Of Sludge At Wastewater Treatment Plantsmentioning

confidence: 99%

Research for waste water treatment technology with low production of excessive active sludge

Panteleeva

2017

Abstract. The article reflects the possibility to create a technological scheme of waste water treatment of domestic and similar type of sewage within minimal amount of excessive active sludge by means of bioreactors with immobilized feed. There are various aspects to be considered: technical, economic, social and ecological. According to the above it is strongly needed to provide a combination of proper waste water treatment, minimal sludge formation and the possibility for a further use of the sludge. One of the ways to achieve the goal above is to use an immobilized feed in the aeration tank. The necessary experiments were carried out in the department of waste water treatment and water ecology. The article includes the scheme of the facility and other parameters of the experiments, which has been carried. The combination of aerobic and anaerobic processes helps to provide proper quality of integrated biological treatment. Chambers of the aeration reactor were also equipped with the polymer feed of various structures. The sludge treatment that was also strongly needed was made by means of aerobic stabilization with the use of ejecting aeration. The results of experiment showed a good effect in both components -sewage and sludge treatment. Afterwards there was also an industrial model launched which confirmed the results of the previous stage.

“…It occurs in the decomposition of organic substances in the result of the activity of two major groups of microorganisms. One group of microorganisms, commonly called acid-forming bacteria or fermentation of microorganisms, breaks down complex organic compounds (proteins, fats and carbohydrates) into more simple, while in the fermentation environment appear primary products of fermentation -volatile fatty acids, lower alcohols, hydrogen, carbon monoxide, acetic and formic acids, etc [15]. These less complex organic substances are a source of food for the second group of bacteria, methaneproducing, which convert organic acids into the desired methane as well as carbon dioxide etc.…”

Section: Biogas Applicationmentioning

confidence: 99%

Production of biogas at wastewater treatment plants and its further application

Semenova

2018

Abstract. This article covered a wide range of questions on the topic of production and use of biogas as alternative energy source. Biogas is produced by anaerobic digestion of biomass due to the breakdown of fats, proteins and carbohydrates, which constitute the bulk of organic matter. The article describes the most common methods of biogas production, their stages and characteristics. In addition, the article describes some of the possible areas of application of biogas on example of different countries. The article also provides information about key environmental and economic benefits in the case of use of biogas: prevention of methane emissions and lower emissions of carbon monoxide and nitrogen oxides into the atmosphere; the possibility of using secondary raw materials to generate electricity.