scholarly journals Identification of Biogenic Sulphate Corrosion of Concrete in Sewage Treatment Plant Settling Tank Walls

2020 ◽  
Vol 30 (3) ◽  
pp. 253-264
Author(s):  
Łukasz Krysiak ◽  
Paweł Falaciński ◽  
Łukasz Szarek
Keyword(s):  
Sulphuric Acid ◽  
Municipal Wastewater ◽  
Sewage Treatment ◽  
Settling Tank ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Cement Matrix ◽  
Wastewater Management ◽  
Municipal Wastewater Treatment ◽  
Biochemical Processes

Abstract One of the basic threats in terms of concrete used for tanks or ducts applied in wastewater management is the phenomenon of biogenic sulphate corrosion (BSC). BSC is a particular case of corrosion caused by the action of sulphuric acid (IV), which is formed as a result of a number of biochemical processes, which can take place, e.g. in an environment encountered within the aforementioned structures. Ions present in sulphuric acid react with cement hydration products, which leads to replacing the primary cement matrix components with compounds easily-soluble or highly-swelling during crystallization. The outcome of advanced corrosion is usually an observed formation of a white, amorphous, sponge-like mass, which is easily separated from the underlying concrete. The article discusses a case study of a BSC process in a newly constructed primary settling tank in a municipal wastewater treatment plant.

Treatment of Rural Domestic Sewage by Solar Ozonic Ecological Sewage Treatment Plant

2014 ◽  
Vol 955-959 ◽  
pp. 3393-3399 ◽  
Author(s):  
Wei Zheng ◽  
Yan Ming Yang ◽  
Yun Long Li ◽  
Jian Qiu Zheng
Keyword(s):  
Municipal Wastewater ◽  
Operating Cost ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Domestic Sewage ◽  
Design Parameters ◽  
Small Scale ◽  
Municipal Wastewater Treatment ◽  
Average Percentage

The process technique and design parameters of project of Solar Ozonic Ecological Sewage Treatment Plant (short for SOESTP) which consists of anaerobic reactor, horizontal subsurface flow (HSSF) constructed wetlands(CWs) and the combination of solar power and ozone disinfection are described, the paper further examines the removal efficiency for treating rural domestic sewage, running expense and recycling ability of product water. The results show that the average percentage removal values of CODcr，BOD5，SS，TN，NH3-N，TP range from 95.6% to 98.0%, 96.0% to 98.7%, 93.1% to 96.1%, 97.0% to 98.9%, 96.9% to 99.5%, 98.2% to 99.6%, respectively, the reduction of fecal coliform (FC) reaches 99.9%, the effluent quality meets the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant（GB18918-2002）. The running cost of SOESTP is 0.063yuan/ m3, saves much more than traditional sewage treatment, and the ozone water obtained from the reservoir will be an ideal choice for disinfection .The system has characteristics of easy manipulation, low operating cost, achieving advanced water, energy conservation and environment protection, is thought to be very suitable for use as the promotion of rural small - scale sewage treatment.

Engineering Research on ECOSUNIDE Technique for Nutrient Removal from Municipal Sewage

2011 ◽  
Vol 383-390 ◽  
pp. 3422-3427
Author(s):  
Yan Li ◽  
Yan Qiu Zhang
Keyword(s):  
Municipal Wastewater ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Experimental System ◽  
Class I ◽  
Municipal Sewage ◽  
Low Carbon ◽  
Municipal Wastewater Treatment ◽  
Engineering Research

For engineering research, ECOSUNIDE technique was applied in a sewage treatment plant under low temperature and low carbon resource. The whole experimental system has being running steadily after reasonable adjustments of influent distribution, returned sludge ratio and DO. The effluent qualities meet the Class I-B Criteria Specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002).Effluent BOD5 and NH3-N meet the Class I-A Criteria. The results indicates that the treatment capacity could fluctuate within a range of ±3000 m3/d with DO properly controlled. In aerobic sections, the best DO was 2-3 mg/L. The optimal sludge emission amount could be attained through settlement ratio and sludge concentration with the present emission amount of sludge of 680 m3/d. It might be the restrictive factor that BOD/TN was less than 3 on TN removal which could not steadily achieve the Class I-A Criteria.

scholarly journals RESEARCH OF SMALL HOUSE HOLD SEWAGE TREATMENT PLANT WORKING / MAŽO BUITINIŲ NUOTEKŲ VALYMO ĮRENGINIO DARBO TYRIMAI

2015 ◽  
Vol 7 (4) ◽  
pp. 449-454 ◽  
Author(s):  
Ernesta Valeikaitė ◽  
Aušra Mažeikienė
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Natural State ◽  
Municipal Wastewater Treatment ◽  
Environmental Aspect ◽  
Treated Sewage

In Lithuania centralized municipal wastewater treatment technologies are applied quite effectively, but there is little evidence of the functioning of individual small wastewater treatment plants. The paper presents the small device AT-6, in the city of Vilnius, and the treated sewage results (BDS7, nitrate, ammonium, total nitrogen, total phosphorus and phosphate concentrations). Studies have shown that treated sewage indicators based on ammonium and nitrate ion concentrations are good. These substances are 2–10 times less than it can be in drinking water according to HN 24: 2003. Concentration of phosphates in the treated sewage ranged from 3.57 to 9.33 mg/L and exceeded the indicators, which were compared. The phosphorus environmental aspect is not dangerous, because treated sewage is not discharged into surface water bodies. Dealing from the pattern of biological indicators and enzymatic activity, the quality of activated sludge is good. Treated sewage does not impair the natural state. Lietuvoje centralizuoto buitinių nuotekų valymo technologijos yra taikomos gana efektyviai, tačiau beveik nėra duomenų, kaip veikia maži individualaus buitinių nuotekų valymo įrenginiai. Straipsnyje analizuojami mažu buitinių nuotekų biologinio valymo įrenginiu AT-6 pasiekiami pagrindiniai išvalymo rodikliai (BDS7, nitratų azoto, amonio azoto, bendrojo azoto, bendrojo fosforo ir fosfatų fosforo koncentracijos). Nuotekų išvalymo laipsnis pagal amonio azoto ir nitratų azoto koncentracijas yra aukštas. Šių medžiagų yra 2–10 kartų mažiau, nei gali būti geriamajame vandenyje pagal HN 24:2003. Fosfatų fosforo (PO4-P) koncentracijos išvalytose nuotekose svyravo nuo 3,57 iki 9,33 mg/l ir viršijo rodiklius, su kuriais buvo lygintos. Šis fosforas aplinkosaugainiu aspektu yra nepavojingas, nes nuotekos nėra išleidžiamos į paviršinį vandens telkinį. Sprendžiant iš rastų biologinių indikatorių ir fermentinio aktyvumo, veikliojo dumblo kokybė yra gera. Išvalytos nuotekos nepablogina gamtos būklės.

scholarly journals Carbapenem-Hydrolyzing GES-5-Encoding Gene on Different Plasmid Types Recovered from a Bacterial Community in a Sewage Treatment Plant

2011 ◽  
Vol 78 (4) ◽  
pp. 1292-1295 ◽  
Author(s):  
Delphine Girlich ◽  
Laurent Poirel ◽  
Rafael Szczepanowski ◽  
Andreas Schlüter ◽  
Patrice Nordmann
Keyword(s):  
Bacterial Community ◽  
Municipal Wastewater ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Content Type ◽  
Carbapenemase Gene ◽  
Class 1 ◽  
Encoding Gene

ABSTRACTPlasmids pRSB113 and pRSB115 were recovered from an activated sludge bacterial community of a municipal wastewater treatment plant in Germany. Both plasmids carry the sameblaGES-5carbapenemase gene, located within two distinct class 1 integrons. These plasmids have different backbones, belong to different incompatibility groups, and could replicate in bothPseudomonas aeruginosaandEscherichia coli.

scholarly journals The Use of Ultrasounds in Improving the Sanitary Quality of Sewage Sludge

Proceedings ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 32
Author(s):  
Eliza Hawrylik
Keyword(s):  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Low Frequency ◽  
Municipal Wastewater Treatment ◽  
Low Frequency Ultrasound ◽  
Municipal Wastewater Treatment Plants

The aim of this article is to study the effect of low-frequency ultrasound on the disintegration of microorganisms present in mixed sewage sludge. Initial and excessive sewage sludge were used for examinations coming from the Bialystok Sewage Treatment Plant. They were exposed to ultrasound at 20 and 40 kHz, in varying sonification times and in the case of variable operation of the ultrasonic cleaner (continuous and pulsating work). Research showed that ultrasound was demonstrating effective action with the tested microorganisms. The 30-minute interaction of ultrasounds at 20 kHz on the bacteria present in sewage sludge resulted in a significant decrease in the number of these microorganisms. The obtained results, therefore, indicate the possibility of using this method to disintegrate microorganisms in municipal wastewater treatment plants.

scholarly journals Experimental Study on Anaerobic Digestion of Remaining Sludge in Municipal Wastewater Treatment Plant

2018 ◽  
Vol 2 (4) ◽  
Author(s):  
Jia Li ◽  
Hong Yang
Keyword(s):  
Anaerobic Digestion ◽  
Environmental Protection ◽  
Municipal Wastewater ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Optimal Operation ◽  
Plant Management ◽  
Municipal Wastewater Treatment ◽  
Excess Sludge

Along with the development and progress of environmental protection management, it is necessary to pay full attention to the disposal of excess sludge in the process of urban sewage treatment plant management. Ensure effective integration of management mechanisms and management paths. To a certain extent, it can improve the actual efficiency of digestion and treatment work and lay a foundation for the optimal operation of environmental protection management. In this paper, the treatment of excess sludge in a sewage treatment plant is studied. The method and results of anaerobic digestion test of excess sludge in a sewage treatment plant are discussed for reference only.

The optimization of a mathematical simulation program to describe the nitrogen removal of the oxidation ditch process

2014 ◽  
Vol 11 (3) ◽  
pp. 265-270
Author(s):  
Qingxue Li ◽  
Xiaojun Fang ◽  
Cuiping Zhang ◽  
Wei Xiao
Keyword(s):  
Municipal Wastewater ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Volume Ratio ◽  
Simulation Software ◽  
Reflux Ratio ◽  
Municipal Wastewater Treatment ◽  
Oxidation Ditch ◽  
Aerobic Zone

To achieve new emission standards and enhance the denitrification of the oxidation ditch in the Handan West Sewage Treatment Plant, this research used the ASM Bio-P model based on self-made simulation software to study the optimum operation of the denitrification efficiency. The results indicate that:1) the volume of the aerobic zone was increased and the volume ratio between aerobic and anoxic zones was controlled to approximately 3:1; 2) the concentration of the dissolved oxygen (DO) in the aerobic zone was increased and was controlled at 1 mg/L in summer and 3 mg/L in winter; 3) the proper sludge retention time (SRT) was controlled and was maintained at 15 d in summer and 20 d in winter; and 4) the appropriate reflux ratio was controlled to 100% and 50% for summer and winter, respectively. The COD, TN, NH3-N and TP in the effluent reached the first (B) standard of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002).

The Decision-Making Method of Model Municipal Wastewater Treatment Plant Based on Cost Model and Hierarchical Structure Model

2013 ◽  
Vol 444-445 ◽  
pp. 1732-1739 ◽  
Author(s):  
Bing Feng Xu ◽  
Dong Hua Liang ◽  
Yan Lv ◽  
Yue Xu
Keyword(s):  
Decision Making ◽  
Municipal Wastewater ◽  
Cost Model ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Analytic Hierarchy ◽  
Urban Sewage ◽  
The Cost

In this paper, three types of urban sewage treatment cost model, Oxidation ditch, ICEAS and A2/O are established respectively. The cost model and the analytic hierarchy process (AHP) were applied to sewage treatment plant for process optimization. It provides guidance for urban sewage treatment process decision-making.

scholarly journals Erythromycin Resistance-Conferring Plasmid pRSB105, Isolated from a Sewage Treatment Plant, Harbors a New Macrolide Resistance Determinant, an Integron-Containing Tn402-Like Element, and a Large Region of Unknown Function

2007 ◽  
Vol 73 (6) ◽  
pp. 1952-1960 ◽  
Author(s):  
A. Schlüter ◽  
R. Szczepanowski ◽  
N. Kurz ◽  
S. Schneiker ◽  
I. Krahn ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Unknown Function ◽  
Municipal Wastewater ◽  
Ralstonia Eutropha ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Macrolide Resistance ◽  
Municipal Wastewater Treatment ◽  
Erythromycin Resistance ◽  
Modification System

ABSTRACT The erythromycin resistance plasmid pRSB105 was previously isolated from an activated sludge bacterial community of a municipal wastewater treatment plant. Compilation of the complete pRSB105 nucleotide sequence revealed that the plasmid is 57,137 bp in size and has a mean G+C content of 56.66 mol%. The pRSB105 backbone is composed of two different replication and/or partitioning modules and a functional mobilization region encoding the mobilization genes mobCDE and mobBA. The first replicon (Rep1) is nearly identical to the corresponding replication module of the multiresistance plasmid pRSB101 isolated from an unknown activated sludge bacterium. Accordingly, pRSB101 and pRSB105 are sister plasmids belonging to a new plasmid family. The second replicon (Rep2) of pRSB105 was classified as a member of the IncP-6 group. While Rep1 confers replication ability only in γ-proteobacteria, Rep2 extents the host range of the plasmid since it is also functional in the β-proteobacterium Ralstonia eutropha. Plasmid pRSB105 harbors the macrolide resistance genes mel and mph, encoding, respectively, a predicted ABC-type efflux permease and a macrolide-2′-phosphotransferase. Erythromycin resistance is mainly attributed to mel, whereas mph contributes to erythromycin resistance to a lesser extent. The second resistance region, represented by an integron-containing Tn402-like element, includes a β-lactam (oxa10) and a trimethoprim (dfrB2) resistance gene cassette. In addition to antibiotic resistance modules, pRSB105 encodes a functional restriction/modification system and two nonresistance regions of unknown function. The presence of different mobile genetic elements that flank resistance and nonresistance modules on pRSB105 indicates that these elements were involved in acquisition of accessory plasmid modules. Comparative genomics of pRSB105 and related plasmids elucidated that pRSB105 evolved by integration of distinct modules from different plasmid sources, including Pseudomonas aeruginosa plasmids, and thus represents a mosaic plasmid.

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