A novel index of total oxygen demand for the comprehensive evaluation of energy consumption for urban wastewater treatment

2019 ◽  
Vol 236 ◽  
pp. 253-261 ◽  
Author(s):  
Li Luo ◽  
Mawuli Dzakpasu ◽  
Baichuan Yang ◽  
Wushou Zhang ◽  
Yahong Yang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Energy Consumption ◽  
Comprehensive Evaluation ◽  
Oxygen Demand ◽  
Urban Wastewater ◽  
Total Oxygen ◽  
Urban Wastewater Treatment

Domestic wastewater treatment by real-scale electrocoagulation process

2020 ◽  
Vol 81 (4) ◽  
pp. 656-667 ◽  
Author(s):  
Serdar Koyuncu ◽  
Sema Arıman
Keyword(s):  
Wastewater Treatment ◽  
Operating Cost ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Urban Wastewater ◽  
Electrocoagulation Process ◽  
Removal Efficiencies ◽  
Urban Wastewater Treatment ◽  
Real Scale

Abstract In this study, domestic wastewaters originating from a settlement with a population of 17,500 were treated by electrocoagulation process in a real-scale EC plant and the economic applicability of the process was investigated. The removal efficiencies of control parameters in the influent and effluent of the real-scale treatment plant such as suspended solids (SS), biological oxygen demand (BOD), chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP) and changes of pH and conductivity parameters were monitored for 12 months. The obtained data were evaluated according to European Urban Wastewater Treatment Directive, Turkish Water Pollution Control Regulation and Turkish Urban Wastewater Treatment Regulation. According to the results obtained, the removal efficiencies of the pollutant parameters were achieved in the range of 72–83% for SS, 67–80% for COD, 69–81% for BOD, 21–47% for TN and 27–46% for TP. Considering the Turkish wastewater discharge regulations, it can be concluded that the discharge standards for SS, COD and BOD parameters were achieved while they were not achieved in certain periods for TN and TP. In addition, the energy consumption and the operating cost of this real-scale plant were determined to be 0.49–0.54 kWh/m3 and 0.24–0.28 EUR/m3, respectively.

scholarly journals Cactus Opuntia as natural flocculant for urban wastewater treatment

2017 ◽  
Vol 76 (7) ◽  
pp. 1875-1883 ◽  
Author(s):  
Raouen Rachdi ◽  
Feyda Srarfi ◽  
Najet Slim Shimi
Keyword(s):  
Wastewater Treatment ◽  
Aluminum Sulfate ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Urban Wastewater ◽  
Sequential Treatments ◽  
Urban Wastewater Treatment ◽  
Cactus Tree ◽  
Sedimentation Processes

The cactus tree, species Opuntia ficus-indica, is a primary material of many products in various domains such as cosmetics, medicine and nutrition. In the present work, we assess its potential as a flocculant. We tried a technique which adopts three sequential treatments that used coagulation, flocculation and sedimentation processes under certain operating conditions. For this purpose, we used the aluminum sulfate (AS) as coagulant and fresh cladodes juice (FCJ) as bioflocculant. All tests were carried out on high turbid urban wastewater collected from the Metlaoui's Wastewater Treatment Plant (MWTP) (in Gafsa in southwest Tunisia). Experiments with this couple AS/FCJ show very interesting results: a high-removal of turbidity (TUR), suspended solids (SS) and chemical oxygen demand (COD). The percentages of abatement of these parameters are respectively 93.65%, 82.75% and 64.30%. The experimental results of the present study prove that the turbidity, SS and COD removal efficiency of new technique is superior to that of conventional process (with only AS). By this technique, we save 50% in AS dose. Moreover, flocs formed by the treatment using AS/FCJ are coarse and readily settleable.

scholarly journals Long-term operation of a novel electrically-enhanced biomass concentrator reactor for wastewater treatment

2018 ◽  
Vol 77 (8) ◽  
pp. 2036-2044 ◽  
Author(s):  
D. Cecconet ◽  
A. Callegari ◽  
A. G. Capodaglio
Keyword(s):  
Wastewater Treatment ◽  
Energy Efficient ◽  
Oxygen Demand ◽  
Urban Wastewater ◽  
Term Operation ◽  
Wide Range ◽  
Biomass Retention ◽  
Electrically Enhanced ◽  
Urban Wastewater Treatment

Abstract Membrane biological reactors (MBRs) are a key technology in wastewater treatment nowadays. However, due to their high construction cost and energetic requirements, alternatives based on the same principle of biomass retention have been designed and operated. Amongst these, biomass concentrator reactors (BCRs), using a coarser filter medium instead of a membrane, have shown to be able to remove a wide range of contaminants from wastewater and groundwater. A new BCR-derived technology enhanced with an electric field, called the electrically-enhanced biomass concentrator reactor (E2BCR), was designed and tested for urban wastewater treatment at different organic loads for a period of 180 days. The electrically-enhanced reactor showed better chemical oxygen demand (COD) removal performances than a non-enhanced control reactor (92.4% and 83.6% respectively) thanks also to electrocoagulation effects, and a lower fouling tendency, and proved to be more energy efficient in comparison with the control reactor in terms of energy consumption per mass of COD removed.

scholarly journals Relationship between Instant Sampling and Daily Average Values of COD for Urban Wastewater Treatment Plants in China

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2475
Author(s):  
Yuhua Zhou ◽  
Jing Lei ◽  
Yu Zhang ◽  
Jing Zhu ◽  
Yafeng Wu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Oxygen Demand ◽  
Urban Wastewater ◽  
Systematic Analysis ◽  
K Value ◽  
Daily Average ◽  
The Stability ◽  
Urban Wastewater Treatment ◽  
The Relationship

Most guidelines for urban wastewater treatment plants (WWTPs) are established on a time basis determination to determine performance and compliance with discharge standards and limits (i.e., maximum daily-average). Nevertheless, there is a lack of a systematic analysis of the relationship between instant sampling and daily average discharge concentration values. The present study used the chemical oxygen demand (COD) automated monitoring data that were collected from 1738 WWTPs in China to discuss the relationship between instant sampling and daily average values. A ratio model (K value) was developed to study the relationship between the reliability of the instant sampling value and the daily average limit for the COD measurements. The K value revealed that the ratio of COD instant and daily average measured concentrations for WWTPs in China collectively ranged from 1.00 to 1.45. The results of this study suggest setting the K value of COD to 1.3 for WWTPs in China to estimate the corresponding instant sampling limit of COD, as well as for most WWTPs in China, in order to ensure the stability of compliance to the daily average limits. The instant sampling value of COD in 24 h should be controlled no more than five times out of the instant sampling limit, which is 1.3 times of the daily average limit.

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