Effect of Hydraulic Retention Time and Recycle Ratio on Anoxic/Oxic Bioreactor and Artificial Wetland Performance for Domestic Wastewater Treatment

2013 ◽  
Vol 8 (2) ◽  
pp. 165-168
Author(s):  
John LADU ◽  
Meiling ZHENG ◽  
Paul DEMETRY ◽  
Xiwu LU
Keyword(s):  
Wastewater Treatment ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Domestic Wastewater ◽  
Artificial Wetland ◽  
Domestic Wastewater Treatment ◽  
Recycle Ratio

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.

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 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.

scholarly journals The use of water spinach (Ipomoea aquatica) in domestic wastewater treatment

2018 ◽  
Vol 17 (03) ◽  
pp. 49-54
Author(s):  
Thinh V. D. Nguyen
Keyword(s):  
Wastewater Treatment ◽  
Retention Time ◽  
Municipal Wastewater ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Planting Density ◽  
Water Spinach ◽  
Ipomoea Aquatica ◽  
Domestic Wastewater Treatment ◽  
Hydroponic Systems

The main objective of this study was to examine the efficacy and capacity of using hydroponic systems in municipal pollutant removal at household scale. Three pilot scaled hydroponic systems [dimension for each system: 4.5 m (L) x ɸ 114 mm] were installed to investigate the optimal age of vegetable, planting density and retention time for household wastewater treatment, respectively. Water spinach (Ipomoea aquatica) planted in 27 plastic cups throughout 4.5-m-length and 114-mm-diameter uPVC pipes filled with wastewater was employed as the treating agent of pollutants. The averaged influent contained proximately 32.5 mg/L suspended solids (SS), 76.0 mg/L biological oxygen demand (BOD5), 220.5 mg/L chemical oxygen demand (COD), 26 mg/L NH_4^+, 5.0 mg/L NO_3^- , and 8.5 mg/L PO_4^(3-) at pH 7.3. Results showed that a designed system consisting of 10 plants of 15-day-old water spinach pre-planted in baked clay in each cup could treat 30 L of domestic wastewater meeting the current municipal wastewater discharge standards in Vietnam (column A standards of QCVN 14:2008/BTNMT) after 4 days of wastewater retention time. If operated under conditions of the above parameters, the pilot-plant hydroponic system can achieve the removal of 65% SS, 82% BOD5, 74% COD, 90% NH_4^+, 30% NO_3^- and 86% PO_4^(3-). The result of this study has provided an applicable domestic wastewater treatment system ecofriendly and suitable for small and medium household areas.

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