Influence of Chironomid Larvae on Activated Sludge and Nitrogen Removal in Domestic Wastewater Treatment

2017 ◽  
Vol 45 (9) ◽  
pp. 1700040
Author(s):  
Qiong Zhang ◽  
Shuying Wang ◽  
Jinhui Yang ◽  
Yongzhen Peng
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Domestic Wastewater ◽  
Chironomid Larvae ◽  
Domestic Wastewater Treatment

scholarly journals Performance and Energy Consumption Evaluation of Rotating Biological Contactor for Domestic Wastewater Treatment

2021 ◽  
Vol 6 (1) ◽  
pp. 101-112
Author(s):  
Sharjeel Waqas ◽  
Muhammad Roil Bilad ◽  
Zakaria B Man
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Operating Cost ◽  
Domestic Wastewater ◽  
Nitrifying Bacteria ◽  
Organic Loading Rate ◽  
Treatment Efficiency ◽  
Domestic Wastewater Treatment ◽  
Rotating Biological Contactors ◽  
Biological Performance

Biological processes are extensively used for wastewater treatment because of low organic footprint, economically feasible, and high treatment efficiency. Rotating biological contactors (RBC), an attached growth biological process offers advantage of low operating cost, simple configuration and structure, reduced bionomical footprint and thus has been extensively employed for organics and nitrogen removal. In this study, RBC was used for the treatment of synthetic domestic wastewater operating at high hydraulic and organic loading rate to demonstrate the biological performance. The results showed that the RBC achieved a treatment efficiency for COD, ammonium, TN and turbidity of 70.2%, 95.2%, 70%, and 78.9 %, respectively. The efficient nitrogen removal and increased nitrate concentration signify the presence of nitrifying bacteria which actively degrade the nitrogen compounds through the nitrification process. Thus, this system is a sound alternative for both domestic and industrial wastewater treatment for decentralized applications.

Simultaneous organic stabilization and nitrogen removal in multi-stage biodrum system

2004 ◽  
Vol 50 (6) ◽  
pp. 95-101
Author(s):  
C. Chiemchaisri ◽  
C. Liamsangoun
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Rotational Speed ◽  
Removal Rate ◽  
Nitrogen Concentration ◽  
Domestic Wastewater ◽  
Organic Removal ◽  
Multi Stage ◽  
Domestic Wastewater Treatment ◽  
Removal Efficiencies

This paper presents the performance of a multi-stage biodrum system applied to domestic wastewater treatment. The organic stabilization and nitrogen removal efficiency in the system was investigated at different hydraulic retention times (HRT) of 12, 6 and 3 hours. The rotational speed of the biodrum was examined at 2,4 and 8 rpm. Average organic removal efficiencies in the system at different HRTs of 12, 6 and 3 hours were 96.3, 94.4 and 90.9%. Simultaneously, average nitrogen removal efficiencies were 91.5, 90.6 and 81.0%. The effect of rotational speed on nitrogen removal efficiencies in the system was clearly observed at a low HRT of 3 hours. The experimental results suggested that optimum HRT in the system was 6 hours. Moreover, they revealed that nitrogen removal efficiencies in the reactors operated at different rotational speed were in the same degree when considering the effluent nitrogen concentration. However, the reactors operated at lower rotational speed needed to employ higher numbers of biodrums (4 stages) than the others with higher rotational speed (3 and 2 stages at 4 and 8 rpm.) in order to achieve similar effluent qualities. At a rotational speed of 2 rpm, maximum nitrogen removal rate was found to be 0.2 kg/m3/d.

Enhancement of oxygen transfer and nitrogen removal in a membrane separation bioreactor for domestic wastewater treatment

2005 ◽  
Vol 51 (10) ◽  
pp. 85-92 ◽  
Author(s):  
C. Chiemchaisri ◽  
K. Yamamoto
Keyword(s):  
Wastewater Treatment ◽  
Low Temperature ◽  
Nitrogen Removal ◽  
Membrane Separation ◽  
Hollow Fiber Membrane ◽  
Domestic Wastewater ◽  
Moderate Temperature ◽  
Nitrifying Bacteria ◽  
Diffusion Resistance ◽  
Domestic Wastewater Treatment

Biological nitrogen removal in a membrane separation bioreactor developed for on-site domestic wastewater treatment was investigated. The bioreactor employed hollow fiber membrane modules for solid–liquid separation so that the biomass could be completely retained within the system. Intermittent aeration was supplied with 90 minutes on and off cycle to achieve nitrification and denitrification reaction for nitrogen removal. High COD and nitrogen removal of more than 90% were achieved under a moderate temperature of 25 °C. As the temperature was stepwise decreased from 25 to 5 °C, COD removal in the system could be constantly maintained while nitrogen removal was deteriorated. Nevertheless, increasing aeration supply could enhance nitrification at low temperature with benefit from complete retention of nitrifying bacteria within the system by membrane separation. At low operating temperature range of 5 °C, nitrogen removal could be recovered to more than 85%. A mathematical model considering diffusion resistance of limiting substrate into the bio-particle is applied to describe nitrogen removal in a membrane separation bioreactor. The simulation suggested that limitation of the oxygen supply was the major cause of inhibition of nitrification during temperature decrease. Nevertheless, increasing aeration could promote oxygen diffusion into the bio-particle. Sufficient oxygen was supplied to the nitrifying bacteria and the nitrification could proceed. In the membrane separation bioreactor, biomass concentration under low temperature operation was allowed to increase by 2–3 times of that of moderate temperature to compensate for the loss of bacterial activities so that the temperature effect was masked.

Sign in / Sign up

Export Citation Format

Share Document