Performance evaluation of a simple wastewater treatment system comprised by UASB reactor, shallow polishing ponds and coarse rock filter

2008 ◽  
Vol 58 (6) ◽  
pp. 1313-1319 ◽  
Author(s):  
Marcos von Sperling ◽  
Carolina Moreira Oliveira ◽  
Juliana G. B. Andrada ◽  
Valéria M. Godinho ◽  
Fernando A. L. Assunção ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Ammonia Removal ◽  
Treatment System ◽  
Uasb Reactor ◽  
E Coli ◽  
Wastewater Treatment System ◽  
Treatment Processes ◽  
Natural Treatment ◽  
In Series ◽  
Overall Performance

The work investigates a small full-scale wastewater treatment system comprised by the following units in series: UASB reactor, three polishing ponds and one coarse rock filter. The overall performance of the system is analyzed based on three years of monitoring using physical-chemical and biological parameters. Good organic matter, suspended solids and ammonia removal is achieved, together with excellent coliform removal (5.70 log units). Mean effluent concentrations of the main parameters are: BOD: 39 mg/L; COD: 109 mg/L; SS = 41 mg/L; ammonia: 10 mg/L; E. coli: 540 MPN/100 mL, indicating compliance with many regulations for effluent discharge and reuse. Main algal classes found in the ponds and final effluent were chlorophyta and euglenophyta. The system is completely unmechanized and has a relatively small total hydraulic retention time (less than 13 days), compared with most natural treatment processes. No sludge removal from the ponds and filter has been necessary so far.

Investigation of aerobic and anaerobic ammonium-oxidising bacteria presence in a small full-scale wastewater treatment system comprised by UASB reactor and three polishing ponds

2010 ◽  
Vol 61 (3) ◽  
pp. 737-743 ◽  
Author(s):  
J. C. Araujo ◽  
M. M. S. Correa ◽  
E. C. Silva ◽  
A. P. Campos ◽  
V. M. Godinho ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Ammonia Removal ◽  
Treatment System ◽  
Nitrifying Bacteria ◽  
Uasb Reactor ◽  
Anammox Bacteria ◽  
Fluorescence In Situ Hybridisation ◽  
Probable Number ◽  
Sediment Samples ◽  
Wastewater Treatment System

This work applied PCR amplification method and Fluorescence in situ hybridisation (FISH) with primers and probes specific for the anammox organisms and aerobic ammonia-oxidising β-Proteobacteria in order to detect these groups in different samples from a wastewater treatment system comprised by UASB reactor and three polishing (maturation) ponds in series. Seven primer pairs were used in order to detect Anammox bacteria. Positive results were obtained with three of them, suggesting that Anammox could be present in polishing pond sediments. However, Anammox bacteria were not detected by FISH, indicating that they were not present in sediment samples, or they could be present but below FISH detection limit. Aerobic ammonia- and nitrite-oxidising bacteria were verified in water column samples through Most Probable Number (MPN) analysis, but they were not detected in sediment samples by FISH. Ammonia removal efficiencies occurred systematically along the ponds (24, 32, and 34% for polishing pond 1, 2, and 3, respectively) but the major reaction responsible for this removal is still unclear. Some nitrification might have occurred in water samples because some nitrifying bacteria were present. Also Anammox reaction might have occurred because Anammox genes were detected in the sediments, but probably this reaction was too low to be noticed. It is important also to consider that some of the ammonia removal observed might be related to NH3 stripping, associated with the pH increase resulting from the intensive photosynthetic activity in the ponds (mechanism under investigation). Therefore, it can be concluded that more than one mechanism (or reaction) might be involved in the ammonia removal in the polishing ponds investigated in this study.

“In Line” Combined Storm and Wastewater Treatment System for Tropical Urban Drainage Catchments

2009 ◽  
Vol 4 (2) ◽  
Author(s):  
Trina G. Listanco
Keyword(s):  
Wastewater Treatment ◽  
Low Income ◽  
Treatment System ◽  
Small Scale ◽  
Urban Drainage ◽  
Difficult Situation ◽  
Wastewater Treatment System ◽  
Treatment Processes ◽  
Rotating Biological Contactors ◽  
Secondary Information

This paper presents a conceptualized combined storm and wastewater treatment system for typical low income, high density drainage catchment similar to the case of Manila City. In many developing and tropical port cities in low-lying floodplains, local and regional floods and non sewered communities compound in a problem that manifests in surface water pollution. This results in particularly difficult situation to introduce major sewerage infrastructure and a centralized wastewater treatment system. Thus, to initiate and invite discussions on different and possible solutions is necessary to address the need to provide appropriate treatment systems in rapidly growing cities and urban populations. This paper aims to contribute to such discussions by suggesting possible treatment processes achievable in limited, under exploited spaces in urban drainage networks. Also the paper mentions systematic estimations relevant to assess and theoretically simulate suggested treatment system. Following Hvitved-Jacobsen etal (2002) recognition of the role of sewers as bioreactors, the proposed system takes reviewed physical and biological techniques to be installed parallel to the track of drainage channels that provides neither on-site nor off-site approaches, but “inline” treatment. Essentially, the system integrates sewers or drains in the entire treatment system. The estimated primary and secondary information on both physical and socio-economic parameters in the study site, and the adapted “alternative” principles of decentralized, small scale systems yielded a multiple site designs including the following treatment processes and units: 1) inline fine and micro screening; 2) vegetated submerged beds (VSB); 3) rotating biological contactors (RBC); and 4) “biotowers”. All were designed to capture and reduce typical wastewater constituents (TSS, BOD, TKN and Coliforms) continuously during “dry” and “average wet” conditions until year 2025. The system embodies an effective and alternative wastewater treatment system for Philippine effluent standards, replicable in other tropical urban drainage catchments.

Simple wastewater treatment (UASB reactor, shallow polishing ponds, coarse rock filter) allowing compliance with different reuse criteria

2006 ◽  
Vol 54 (11-12) ◽  
pp. 199-205 ◽  
Author(s):  
M. von Sperling ◽  
J.G.B. de Andrada
Keyword(s):  
Wastewater Treatment ◽  
Suspended Solids ◽  
Uasb Reactor ◽  
E Coli ◽  
Different Types ◽  
Overall Performance ◽  
Uasb Reactors ◽  
Very High ◽  
Potential Use ◽  
Wastewater Treatment Systems

UASB reactors followed by polishing ponds comprise simple and economic wastewater treatment systems, capable of reaching very high removal efficiencies of pathogenic organisms, leading to the potential use of the effluent for unrestricted irrigation. However, for other types of reuse (urban and industrial), ponds are limited in the sense of producing effluents with high suspended solids (algae) concentrations. The work investigates a system with coarse rock filters for polishing the pond effluent. The overall performance of the system is analyzed, together with the potential for different types of reuse. The excellent results obtained (mean effluent concentrations: BOD: 27 mg/L; SS: 26 mg/L; E. coli: 450 MPN/100 mL) indicate the possibility of unrestricted use of the effluent for agriculture and restricted urban and industrial uses, according to WHO and USEPA.

scholarly journals Antibiotic Resistance Profile of Bacteria Isolated from Wastewater Systems in Eastern Ethiopia

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Awugchew Teshome ◽  
Tadesse Alemayehu ◽  
Wegene Deriba ◽  
Yohanes Ayele
Keyword(s):  
Antibiotic Resistance ◽  
Wastewater Treatment ◽  
Antimicrobial Resistance ◽  
Activated Sludge ◽  
Treatment System ◽  
Hospital Wastewater ◽  
Eastern Ethiopia ◽  
E Coli ◽  
Wastewater Treatment System ◽  
Wastewater Systems

World Health Organizations launched a global action plan on antimicrobial resistance since 2015. Along with other objectives, the plan was aimed to strengthen knowledge of the spread of antimicrobial resistance through surveillance and research. Given their high bacterial densities and that they receive antibiotics, metals, and other selective agents, wastewater systems are a logical hotspot for antibiotic resistance surveillance. The current study reports on the result of antibiotic resistance surveillance conducted in selected wastewater systems of Eastern Ethiopia from Feb. 2018 to Oct. 2019. We monitored three wastewater systems in Eastern Ethiopia, such as the activated sludge system of Dire Dawa University, waste stabilization pond of Haramaya University, and a septic tank of Hiwot Fana Specialized University Hospital for 18 months period. We collected 66 wastewater samples from 11 sampling locations and isolated 722 bacteria using selective culture media and biochemical tests. We tested their antibiotic susceptibility using the standard Kirby-Bauer disk diffusion method on the surface of the Mueller-Hinton agar and interpreted the result according to EUCAST guidelines. The result shows the highest percentage of resistance for ampicillin among isolates of hospital wastewater effluent which is 36 (94.7%), 33 (91.7%), and 32 (88.9%) for E. coli, E. faecalis, and E. faecium, respectively. A lower rate of resistance was seen for gentamicin among isolates of activated sludge wastewater treatment system which is 10 (16.4%), 8 (13.3%), 11 (18.9%), and 12 (20.3%) for E. coli, E. faecalis, E. faecium, and P. aeruginosa, respectively. Hospital wastewater exhibited higher resistance than the other two wastewater systems. The Multiple Antibiotic Resistance Index (MARI) has significantly increased in the wastewater’s course treatment process, showing the proliferation of resistance in the wastewater treatment system.

Performance of hybrid small wastewater treatment system consisting of jet mixed separator and rotating biological contactor

1997 ◽  
Vol 35 (6) ◽  
pp. 63-70 ◽  
Author(s):  
Yoshimasa Watanabe ◽  
Yoshihiko Iwasaki
Keyword(s):  
Wastewater Treatment ◽  
Electric Power ◽  
Hybrid System ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Treatment System ◽  
Municipal Wastewater Treatment ◽  
Wastewater Treatment System ◽  
Pre Treatment ◽  
Organic Particles

This paper describes a pilot plant study on the performance of a hybrid small municipal wastewater treatment system consisting of a jet mixed separator(JMS) and upgraded RBC. The JMS was used as a pre-treatment of the RBC instead of the primary clarifier. The treatment capacity of the system was fixed at 100 m3/d, corresponding to the hydraulic loading to the RBC of 117 L/m2/d. The effluent from the grid chamber at a municipal wastewater treatment plant was fed into the hybrid system. The RBC was operated using the electric power produced by a solar electric generation panel with a surface area of 8 m2 under enough sunlight. In order to reduce the organic loading to the RBC, polyaluminium chloride(PAC) was added to the JMS influent to remove the colloidal and suspended organic particles. At the operational condition where the A1 dosage and hydraulic retention time of the JMS were fixed at 5 g/m3 and 45 min., respectively, the average effluent water quality of hybrid system was as follows: TOC=8 g/m3, Total BOD=8 g/m3, SS=8 g/m3, Turbidity=6 TU, NH4-N=7 g/m3, T-P=0.5 g/m3. In this operating condition, electric power consumption of the RBC for treating unit volume of wastewater is only 0.07 KWH/m3.

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