Significance of indicator bacteria changes in an urban stream

1995 ◽  
Vol 31 (5-6) ◽  
pp. 243-246 ◽  
Author(s):  
Ernst M. Davis ◽  
M. Truett Garrett ◽  
Terri D. Skinner
Keyword(s):  
Fecal Coliform ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
High Flow ◽  
Fecal Coliforms ◽  
Urban Stream ◽  
Municipal Wastewater Treatment ◽  
Bacterial Populations ◽  
Sewerage System ◽  
Tidal Reach

An urban coastal stream, above tidal reach, and three municipal wastewater treatment plant effluents were analyzed for fecal coliforms, fecal streptococci and enterococci to determine the effect of dechlorination on those bacterial populations. Analyses were conducted during low and high flow periods from stormwater inflow. Improvement in bacterial water quality was found, principally due to municipality efforts to correct illicit connections and other sewerage system problems. Fecal coliform genera were identified and quantified. Regrowth of dechlorinated effluent bacteria was minimal.

Investigation of Bacterial Populations Producing Elevated MPN Values and False Positive Fecal Coliform Counts and Applicable Disinfectants in an Industrial Wastewater

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2181-2182 ◽  
Author(s):  
E. M. Davis ◽  
D. L. Manville ◽  
J. J. Mathewson ◽  
G. W. Meriwether
Keyword(s):  
Fecal Coliform ◽  
Municipal Wastewater ◽  
Waste Treatment ◽  
Treatment Plant ◽  
Paper Mill ◽  
Most Probable Number ◽  
Pulp And Paper Mill ◽  
Klebsiella Species ◽  
Bacterial Populations ◽  
Probable Number

This poster presents data on the types of bacteria which produced elevated, most probable number (MPN) fecal coliform values in an industrial waste treatment plant effluent. The principal influent stream, a pulp and paper mill wastewater, contained principally Klebsiella species of environmental, not enteric origin. Fecal streptococci and enterococci were low in numbers. Eight disinfectants were tested on a small (currently acid disinfected) municipal wastewater incoming stream and on the main plant effluent.

Effect of Suspended Particles on Disinfection of a Physicochemical Municipal Wastewater with Peracetic Acid

2008 ◽  
Vol 43 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Dario Falsanisi ◽  
Ronald Gehr ◽  
Lorenzo Liberti ◽  
Michele Notarnicola
Keyword(s):  
Peracetic Acid ◽  
Phosphorus Removal ◽  
Fecal Coliform ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Chemical Precipitation ◽  
Microbial Inactivation ◽  
Fecal Coliforms

Abstract The aim of this study was to elucidate the role of total suspended solids (TSS, which are claimed to be responsible for protecting embedded microorganisms) during disinfection of wastewater with peracetic acid (PAA). In particular, the focus was on a physicochemical effluent, having been treated with ferric chloride for TSS and phosphorus removal. Batch disinfection tests with various PAA dosages and contact times were carried out on the effluent from Montreal's wastewater treatment plant which uses only chemical precipitation and primary sedimentation. In addition to these samples, disinfection of “medium” and “highly” filtered effluents, obtained by sequential filtration through 120- and 10-µm nominal pore size membrane laboratory filters, was investigated. Modified second-order and Selleck model kinetics were used with moderate success to describe disinfectant consumption and microbial inactivation rates, respectively. This study showed that the overall amount of protection afforded by TSS to the microbial indicator considered (i.e., fecal coliforms in this case) was approximately 1.9 logs. TSS size was a key variable in this protection; approximately 1.3 logs and an additional 0.6 logs was the protection afforded by TSS greater than 120 µm, and between 10 µm and 120 µm, respectively. Fecal coliform inactivation of 3.8 to 7.3 logs after 40 minutes contact time could be achieved with a PAA dosage of 2 or 8 mg/L, respectively, in a highly filtered effluent.

scholarly journals Health and water quality benefits of alternative sewerage systems in Metro Manila, Philippines

2017 ◽  
Vol 29 (2) ◽  
pp. 567-580 ◽  
Author(s):  
Rosalina Palanca-Tan
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Household Survey ◽  
Health Improvement ◽  
Municipal Wastewater Treatment ◽  
Sewerage System ◽  
Metro Manila ◽  
Improvement Effect

This paper presents results of a household survey on the current sanitation and sewerage conditions in Metro Manila. The survey included a choice, measured in terms of the marginal willingness to pay (MWTP), between two alternative domestic wastewater treatment systems: 1) a sewerage system connecting individual households to a treatment plant through sewer lines; and 2) a combined drainage–sewerage system in which wastewater effluent flows with rainwater through flood canals and is intercepted for treatment only at a certain point in the waterway. With the second, the health improvement effect may be limited, but the cost can be significantly lower. The finding in favour of the combined drainage–sewerage system lends some support to this new approach in municipal wastewater treatment, which some other increasingly congested metropolises in Asian countries are likewise adopting, as an alternative to the more costly individual household sewer connections.

Mesquite wood chips (Prosopis) as filter media in a biofilter system for municipal wastewater treatment

2015 ◽  
Vol 73 (6) ◽  
pp. 1454-1462 ◽  
Author(s):  
D. B. Sosa-Hernández ◽  
J. M. Vigueras-Cortés ◽  
M. A. Garzón-Zúñiga
Keyword(s):  
Municipal Wastewater ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Filter Material ◽  
Wood Chips ◽  
Fecal Coliforms ◽  
Municipal Wastewater Treatment ◽  
Operational Parameters ◽  
Regulatory Standards ◽  
In Series

The biofiltration system over organic bed (BFOB) uses organic filter material (OFM) to treat municipal wastewater (MWW). This study evaluated the performance of a BFOB system employing mesquite wood chips (Prosopis) as OFM. It also evaluated the effect of hydraulic loading rates (HLRs) in order to achieve the operational parameters required to remove organic matter, suspended material, and pathogens, thus meeting Mexican and US regulations for reuse in irrigation. Two biofilters (BFs) connected in series were installed; the first one aerated (0.62 m3air m−2h−1) and the second one unaerated. The source of MWW was a treatment plant located in Durango, Mexico. For 200 days, three HLRs (0.54, 1.07, and 1.34 m3m−2d−1) were tested. The maximum HLR at which the system showed a high removal efficiency of pollutants and met regulatory standards for reuse in irrigation was 1.07 m3m−2d−1, achieving removal efficiencies of biochemical oxygen demand (BOD5) 92%, chemical oxygen demand (COD) 78%, total suspended solids (TSS) 95%, and four log units of fecal coliforms. Electrical conductivity in the effluent ensures that it would not cause soil salinity. Therefore, mesquite wood chips can be considered an innovative material suitable as OFM for BFs treating wastewaters.

Candidatus Kaistella beijingensis sp. nov. isolated from a municipal wastewater treatment plant is involved in sludge foaming

2021 ◽  
Author(s):  
Yang Song ◽  
Cheng-Ying Jiang ◽  
Zong-Lin Liang ◽  
Hai-Zhen Zhu ◽  
Yong Jiang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Extracellular Polymeric Substances ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Bacterial Populations ◽  
Microbiological Methods ◽  
Culture Independent ◽  
And Performance

Biological foaming (or biofoaming) is a frequently occurring problem in wastewater treatment plants (WWTPs) and is attributed to the overwhelming growth of filamentous bulking and foaming bacteria (BFB). Biological foaming has been intensively investigated, with BFB like Microthrix and Skermania having been identified from WWTPs and implicated in foaming. Nevertheless, studies are still needed to improve our understanding of the microbial diversity of WWTPs biofoams and how microbial activities contribute to foaming. In this study, sludge foaming at the Qinghe WWTP of China was monitored, and sludge foams were investigated using culture-dependent and culture-independent microbiological methods. The foam microbiomes exhibited high abundances of Skermania , Mycobacterium , Flavobacteriales , and Kaistella . A previously unknown bacterium, Candidatus Kaistella beijingensis, was cultivated from foams, its genome sequenced, and it was phenotypically characterized. Ca . K. beijingensis exhibits hydrophobic cell surfaces, produces extracellular polymeric substances (EPS), and metabolizes lipids. Ca . K. beijingensis abundances were proportional to EPS levels in foams. Several proteins encoded by the Ca . K. beijingensis genome were identified from EPS that was extracted from sludge foams. Ca . K. beijingensis populations accounted for 4–6% of the total bacterial populations in sludge foam samples within the Qinghe WWTP, although their abundances were higher in spring than in other seasons. Co-occurrence analysis indicated that Ca . K. beijingensis was not a core node among the WWTP community network, but its abundances were negatively correlated with those of the well-studied BFB Sker mania piniformis among cross-season Qinghe WWTP communities. Importance Biological foaming or scumming is a sludge separation problem that has become the subject of major concern for long-term stable activated sludge operation in decades. Biological foaming was considered induced by foaming bacteria. However, the occurrence and deterioration of foaming in many WWTPs are still not completely understood. Cultivation and characterization of the enriched bacteria in foaming are critical to understand their genetic, physiological, phylogenetic, and ecological traits, as well as to improve the understanding of their relationships with foaming and performance of WWTPs.

Single-stage Sequencing Batch Process for Producing Class A Biosolids from AD Effluent at Terminal Island Treatment Plant

2006 ◽  
Vol 1 (4) ◽  
Author(s):  
Huub H.J. Cox ◽  
Steve Fan ◽  
Reza Iranpour
Keyword(s):  
Fecal Coliform ◽  
Treatment Plant ◽  
Batch Process ◽  
Single Stage ◽  
Fecal Coliforms ◽  
Class A ◽  
Truck Loading ◽  
Train Operation ◽  
Plant Control ◽  
Class A Biosolids

Terminal Island Treatment Plant converted its digesters to thermophilic operation with the objective to comply with the U.S. EPA Part 503 Biosolids Rule requirements for Class A biosolids. The following processes were tested: a) single-stage continuous; b) two-stage continuous; c) single-stage sequencing batch. Salmonella sp. were always non-detect in digester outflows (<3 MPN/4 g dry wt), whereas fecal coliform densities were usually below the Class A limit of 1000 MPN/g dry wt. However, the recurrence of fecal coliforms in post-digestion caused non-compliance with the Class A limit at the truck loading facility as the last point of plant control for compliance. After several design modifications of the post-digestion train, operation of the digesters as sequencing batch digesters according to the time-temperature requirement of Alternative 1 of the Part 503 Biosolids Rule achieved compliance for both Salmonella sp. and fecal coliforms at the last point of plant control (truck loading facility).

WASTEWATER DISINFECTION BY UV AT TRANI MUNICIPAL PLANT

1994 ◽  
Vol 30 (4) ◽  
pp. 125-132 ◽  
Author(s):  
D. Carnimeo ◽  
E. Contini ◽  
R. Di Marino ◽  
F. Donadio ◽  
L. Liberti ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Continuous Operation ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
South Italy ◽  
Wastewater Disinfection ◽  
Pilot Investigation ◽  
Effluent Characteristics

The pilot investigation on the use of UV as an alternative disinfectant to NaOCI was started in 1992 at Trani (South Italy) municipal wastewater treatment plant (335 m3/h). The results collected after six months continuous operation enabled us to compare UV and NaOCl disinfection effectiveness on the basis of secondary effluent characteristics, quantify photoreactivation effects, evidence possible DBP formation and assess costs.

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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