In situ investigation of tubular microbial fuel cells deployed in an aeration tank at a municipal wastewater treatment plant

2013 ◽  
Vol 136 ◽  
pp. 316-321 ◽  
Author(s):  
Fei Zhang ◽  
Zheng Ge ◽  
Julien Grimaud ◽  
Jim Hurst ◽  
Zhen He
Keyword(s):  
Wastewater Treatment ◽  
Fuel Cells ◽  
Wastewater Treatment Plant ◽  
Microbial Fuel Cells ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Aeration Tank ◽  
Municipal Wastewater Treatment ◽  
In Situ Investigation

Treatment of Leather and Fur Wastewater by a Rotating Biological Contactor

1990 ◽  
Vol 22 (1-2) ◽  
pp. 119-126 ◽  
Author(s):  
Yang Zao-yan ◽  
Fan Zhen-san
Keyword(s):  
Wastewater Treatment ◽  
Liquid Film ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Great Influence ◽  
Treatment Plant ◽  
Aeration Tank ◽  
Municipal Wastewater Treatment ◽  
Rotating Biological Contactor ◽  
Volumetric Loading

The operation of a leather and fur wastewater treatment plant has been stable for 8 years. The volumetric loading was 85 to 110 l/m2.d, and the BOD loading and COD loading of the influent to the rotating biological contactor (RBC) were 15 to 20 g/m2.d and 50 to 65 g/m2.d respectively. Analyses have shown that the BOD5, COD, suspended solids (SS), S2−, and Cr3+ removals were 87.8, 77.4, 84.8, 93.6, and 81.0%, respectively. Several factors were considered in the design and performance of this leather and fur wastewater treatment plant. The pretreatment stage has a great influence on the operation of the RBC. The performance of the pre-aeration tank and primary clarifier regarding both BOD and COD removal approached 50%, therefore the organic loading of the RBC was reduced. However, shock flows of limewash waste from the workshop decreased the efficiency of the RBC. The high pH in the liquid film on the discs caused CaCO3 to precipitate and settle as scale on the surfaces of the discs. As the pH increased, NH3 stripping in the liquid film increased, and care had to be taken regarding proper room ventilation when the wastewater pH was high. Due to the high concentrations of organic matter and poorly biodegradable matter in the leather and fur wastewater, the rotational speed of the RBC must be increased compared with municipal wastewater treatment to ensure adequate aeration and to prevent blockages. In practice, the RBC linear velocities were between 25 to 30 m/min.

scholarly journals Assessment of Microplastics in a Municipal Wastewater Treatment Plant with Tertiary Treatment: Removal Efficiencies and Loading per Day into the Environment

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1339
Author(s):  
Javier Bayo ◽  
Sonia Olmos ◽  
Joaquín López-Castellanos
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Treatment Plant ◽  
Source Control ◽  
Municipal Wastewater Treatment ◽  
Tertiary Treatment ◽  
Stable Performance ◽  
Wastewater Samples

This study investigates the removal of microplastics from wastewater in an urban wastewater treatment plant located in Southeast Spain, including an oxidation ditch, rapid sand filtration, and ultraviolet disinfection. A total of 146.73 L of wastewater samples from influent and effluent were processed, following a density separation methodology, visual classification under a stereomicroscope, and FTIR analysis for polymer identification. Microplastics proved to be 72.41% of total microparticles collected, with a global removal rate of 64.26% after the tertiary treatment and within the average retention for European WWTPs. Three different shapes were identified: i.e., microfiber (79.65%), film (11.26%), and fragment (9.09%), without the identification of microbeads despite the proximity to a plastic compounding factory. Fibers were less efficiently removed (56.16%) than particulate microplastics (90.03%), suggesting that tertiary treatments clearly discriminate between forms, and reporting a daily emission of 1.6 × 107 microplastics to the environment. Year variability in microplastic burden was cushioned at the effluent, reporting a stable performance of the sewage plant. Eight different polymer families were identified, LDPE film being the most abundant form, with 10 different colors and sizes mainly between 1–2 mm. Future efforts should be dedicated to source control, plastic waste management, improvement of legislation, and specific microplastic-targeted treatment units, especially for microfiber removal.

scholarly journals Energy Valorisation of Wastewater Treatment Plant Sludge through Thermal Gasification: An Economic Perspective

Proceedings ◽  
2021 ◽  
Vol 52 (1) ◽  
pp. 3
Author(s):  
Luis F. Carmo-Calado ◽  
Roberta Mota-Panizio ◽  
Gonçalo Lourinho ◽  
Octávio Alves ◽  
I. Gato ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Electricity Production ◽  
Baseline Scenario ◽  
Municipal Wastewater Treatment ◽  
Plant Processing ◽  
Sludge Drying ◽  
Calorific Power

The technical-economic analysis was carried out for the production of sludge-derived fuel from a municipal wastewater treatment plant (WWTP). The baseline for the analysis consists of a sludge drying plant, processing 6 m3 of sludge per day and producing a total of about 1 m3 of combustible material with 8% of moisture and a higher calorific power of 18.702 MJ/kg. The transformation of biofuel into energy translates into an electricity production of about 108 kW per 100 kg of sludge. The project in the baseline scenario demonstrated feasibility with a payback time of about six years.

Impact of a wastewater treatment plant on Cryptosporidium oocysts and Giardia cysts occurring in a surface water

2000 ◽  
Vol 41 (7) ◽  
pp. 31-37 ◽  
Author(s):  
E. Carraro ◽  
E. Fea ◽  
S. Salva ◽  
G. Gilli
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Mean Values ◽  
Cryptosporidium Oocysts ◽  
The Impact ◽  
Receiving Water ◽  
Giardia Cysts

The aim of this study was to assess the impact of a municipal wastewater treatment plant (MWTP) on the occurrence of Cryptosporidium oocysts and Giardia cysts in the receiving water. All MWTP effluent samples were Giardia and Cryptosporidium contaminated, although low mean values were found for both parasites (0.21±0.06 oocysts/L; 1.39±0.51 cysts/L). Otherwise, in the raw sewage a greater concentration was detected (4.5±0.3 oocysts/L; 53.6±6.8 cysts/L). The major occurrence of Giardia over Cryptosporidium, both in the influent and in the effluent of the MWTP, is probably related to the human sewage contribution to the wastewater. Data on protozoa contamination of the receiving water body demonstrated similar concentrations in the samples collected before (0.21±0.07 oocysts/L; 1.31±0.38 cysts/L) and after (0.17±0.09 oocysts/L and 1.01±1.05 cysts/L) the plant effluent discharge. The results of this study suggest that the MWTP has no impact related to Giardia and Cryptosporidium river water contamination, and underline the need for investigation into the effectiveness of these protozoa removal by less technologically advanced MWTPs which are the most widespread and could probably show a lower ability to reduce protozoa.

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