scholarly journals SEWAGE PHOSPHORUS REMOVAL USING HEN EGGSHELLS THROUGH DIFFERENT CONTACT SYSTEMS

2020 ◽  
Vol 28 ◽  
Author(s):  
Juliano Curi de Siqueira ◽  
Mateus Pimentel de Matos ◽  
Ivan Célio Andrade Ribeiro ◽  
Ronaldo Fia ◽  
Antonio Teixeira de Matos
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Hydraulic Retention Time ◽  
Domestic Wastewater ◽  
Removal Capacity ◽  
P Concentration ◽  
Domestic Wastewater Treatment ◽  
Real Wastewater ◽  
Maximum Removal ◽  
P Removal

Hen eggshell is a waste with high phosphorus (P) removal capacity from synthetic solutions. However, there is a lack of knowledge about how to use this material on P removal from real wastewater. The present study proposed to evaluate two types of system for P removal from wastewater using eggshells. On the first system, eggshells grinded, sieved in 0.425 mm, and contained in coffee filters, were fixed to baffles using calico cloth bags. On the second, the eggshells in the same conditions were attached to vertical wooden rods and distributed at different heights. For both systems, P concentration was daily monitored for four weeks, with and without medium acidification and hydraulic retention time of one day. The baffles system was more efficient, reaching a maximum removal of 15.93% in wastewater with pH 4.73. P removals did not differ significantly over the weeks; however, there is a tendency to vary the efficiencies according to the change in pH. The baffled tank, for presenting higher performance in P removal, is the most suitable for use in a domestic wastewater treatment system.

Research on Features of Domestic Wastewater Treatment and Mechanism of Denitrification in Anaerobic MBBR Reactor

2012 ◽  
Vol 455-456 ◽  
pp. 1030-1036
Author(s):  
Hui Zhou Yuan ◽  
Jian Bang Zhao ◽  
Shui Zhou Ke
Keyword(s):  
Wastewater Treatment ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Ammonia Oxidation ◽  
Ph Value ◽  
Domestic Wastewater ◽  
N Concentration ◽  
Domestic Wastewater Treatment ◽  
Anaerobic Ammonia Oxidation ◽  
Nitrification And Denitrification

This paper studied on the treatment of urban domestic wastewater with Anaerobic MBBR in the tropical and subtropical areas in the South of China. The emphasis focused on the effects of the Hydraulic Retention Time (HRT) and pH value to the CODCrconcentration and the NH3-N concentration of the outflow of the reactor. Moreover, the mechanism of denitrification was also explored. The results showed that the mechanism of denitrification of the reactor was found. When HRT was equal to or more than 8h, NH3-N was reduced mainly in the way of short-cut nitrification and denitrification. When HRT was less than 8h, the reactions of short-cut nitrification and denitrification & anaerobic ammonia oxidation both existed in the reactor.

scholarly journals DENITRIFICATION OF WASTEWATER TREATMENT PLANT EFFLUENT USING ANAEROBIC BACTERIAL BED REACTOR IMMERSED : OPERATING PERFORMANCE

2018 ◽  
pp. 208-218
Author(s):  
Aboubacar Sylla ◽  
Aboussabiq Fatima Ezzahra ◽  
Hassou Najwa ◽  
Mohamed Rihani ◽  
Amine Jamal ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Operating Time ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Maintenance Cost ◽  
Loading Rates ◽  
Domestic Wastewater Treatment ◽  
Real Wastewater ◽  
Time Of Operation ◽  
Made In

In this study, a heterotrophic denitrification was designed for domestic wastewater treatment with unexpected water flows at different loading rates. Benefited from excellent removal ability COD, shorten operating time and lower maintenance cost. During the time of operation (six months), injection of nitrate was made in the influent RALBI 1 while the RALBI 2 was fed with sewage without addition of nitrate. The COD concentration in the influent of the two reactors was the same. This two reactors (RALBI1 and RALBI2) were fed with real wastewater for 172 days at 6 h HRT, the average COD removal were 71.55% and 54.82% for RALBI1 and RALBI2 respectively. The results showed that RALBI1 has good removal performance for COD compared with RALBI2. This could be due the injected nitrate in RALBI1 whose effect has further stimulated the activity of denitrifying bacteria.

New Nitrogen and Phosphorus Removal Process Development Based on Simulation

2013 ◽  
Vol 663 ◽  
pp. 958-963
Author(s):  
Chang Ming Shen ◽  
Dian Hai Yang ◽  
Guo Hua Wang
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Process Development ◽  
Domestic Wastewater ◽  
Pollutant Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Wastewater Treatment Process ◽  
Removal Process ◽  
Removal Capacity

Nitrogen and phosphorus are the nutrients induced eutrophication, therefore the removal of nitrogen and phosphorus is the main target of domestic wastewater treatment. In order to achieve better nutrient removal effect with lower construction and operation cost, a new nitrogen and phosphorus removal process was developed based on simulation. New process named MUST was developed by mixing UCT and step-feed BNR technology together, and possessed the advantages of two processes. The results of simulation show that MUST can achieve similar treating effect with 20% shorter hydraulic retention time (HRT) compared with UCT process. The influent splitting ratio of 4:3:3 was recommended for MUST operation. A pilot experiment of MUST was also carried out according to simulation results, and achieved very good pollutant remove effect, the average COD, NH4+-N, TN, TP removal efficiency were 85.4%, 94.0%, 65.1%, 62.3% respectively under the condition of low influent COD/TN ratio. Considering the excellent pollutant removal capacity of MUST, an upgrade project chose it as wastewater treatment process. This paper just starts the research of MUST, further study is necessary and valuable.

Integrated Processes of Anoxic/Oxic Bioreactor and Artificial Wetland for Rural Domestic Wastewater Treatment

2014 ◽  
Vol 955-959 ◽  
pp. 2526-2529 ◽  
Author(s):  
John Leju Celestino Ladu ◽  
Xi Wu Lu ◽  
Ahmed Mohammed Osman
Keyword(s):  
Wastewater Treatment ◽  
Taihu Lake ◽  
Hydraulic Retention Time ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Artificial Wetland ◽  
Domestic Wastewater Treatment ◽  
Recycle Ratio ◽  
Environmental Laboratory ◽  
Integrated Processes

This paper examined the treatment of rural domestic wastewater. Influent and effluent samples were experimented for Chemical oxygen demand (COD), NH4+-N, NO3--N and TP in the Taihu Lake Environmental laboratory of Southeast University in Wuxi. Different hydraulic retention time (HRT) and recycle ratios were applied to appraise their influence on removal efficiency. The wastewater temperature was controlled between 20 to 24°C and pH ranges 7.6 – 8.1. The result revealed average COD, NH4+-N, NO3--N and TP removal efficiencies of 77.2, 74.1, 94 and 83% with optimum HRT of 3hrs and recycle ratio of 2 respectively. The obtained results confirmed that, the integrated processes of anoxic/oxic bioreactor and artificial wetland was viable and proficient in domestic wastewater treatment.

Analysis on Phosphorus Removal from Domestic Wastewater Treatment Plant by Biological Aerated Filter

2013 ◽  
Vol 641-642 ◽  
pp. 299-302 ◽  
Author(s):  
Yin Song Liu ◽  
Hong Jun Han ◽  
Chun Yan Xu ◽  
Bing Wang ◽  
Jian Feng Tan
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Phosphorus Removal ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Biological Aerated Filter ◽  
Biological Phosphorus Removal ◽  
Domestic Wastewater Treatment ◽  
Aerated Filter ◽  
Biological Phosphorus

Hydrolysis acidification / pre-denitrification biological aerated filter was adopted in a domestic wastewater treatment plant. The effluent was accorded with a standard in the Integrated Wastewater Discharge Standard（GB18918-2002）, in which the effluent phosphorus was demanded below 0.5mg/L. Through analysis on the process biological phosphorus removal, biological method can be found to total phosphorus 1.5 mg/L. If you reach level to an emissions standards, phosphorus chemical experiment research, finally determined by strategy for the CN pool, point for adding potions FeCl3, dosing quantity for 35mg/L.

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