scholarly journals Role of heterotrophic nitrifiers and aerobic denitrifiers in simultaneous nitrification and denitrification process: A non‐conventional nitrogen removal pathway in wastewater treatment

2021 ◽  
Author(s):  
Rakesh Kumar Gupta ◽  
Bhagyashri Jagdishprasad Poddar ◽  
Suraj Prabhakarrao Nakhate ◽  
Atul Rajkumar Chavan ◽  
Ashish Kumar Singh ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Simultaneous Nitrification And Denitrification ◽  
Nitrification And Denitrification ◽  
Denitrification Process

Simultaneous nitrification and denitrification in biofilters with real time aeration control

2001 ◽  
Vol 43 (1) ◽  
pp. 269-276 ◽  
Author(s):  
N. Puznava ◽  
M. Payraudeau ◽  
D. Thornberg
Keyword(s):  
Real Time ◽  
Nitrogen Removal ◽  
Simultaneous Nitrification And Denitrification ◽  
Biological Aerated Filter ◽  
Diffusion Effect ◽  
Different Depths ◽  
Nitrification And Denitrification ◽  
Aerated Filter ◽  
Denitrification Process ◽  
Aeration Control

The aim of this article is to present a new biological aerated filter (BAF) for nitrogen removal based on simultaneous nitrification and denitrification. Contrary to the systems which integrate both an aerated and a non-aerated zone to allow complete nitrogen removal in one compact or two different units (pre-denitrification and nitrification), this upflow BAF system is based on the principle of simultaneous nitrification and denitrification since the filter is completely aerated. The denitrification process is possible due to the diffusion effect which dominates biofilm processes. The real time aeration control allows us to maintain a low dissolved oxygen value (0.5 to 3 mg O2/l). In this case, the biofilm will not be fully (or less) penetrated with oxygen and denitrification will be carried out in a large part of the biofilm. Therefore, nitrification and denitrification is running simultaneously in different depths of the biofilm. By using 50% less air this BAF gave the same results (less than 20mg TN/l) on pilot plant as a classical nitrification and denitrification BAF (Toettrup et al., 1994). Less recirculation was necessary to achieve the same denitrification.

Simultaneous nitrification and denitrification using a polypyrrole/microbial cellulose electrode in a membraneless bio-electrochemical system

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 72699-72708 ◽  
Author(s):  
Hooshyar Hossini ◽  
Abbas Rezaee ◽  
Bita Ayati ◽  
Amir Hossein Mahvi
Keyword(s):  
Aqueous Solution ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Simultaneous Nitrification And Denitrification ◽  
Electrochemical System ◽  
Microbial Cellulose ◽  
System P ◽  
Total Nitrogen Removal ◽  
Nitrification And Denitrification ◽  
Denitrification Process

In this study, the feasibility of ammonium and total nitrogen removal from aqueous solution using a simultaneous nitrification and denitrification process was studied in a membraneless bio-electrochemical system with a novel electrode.

Enhancing nitrogen removal efficiency in a dyestuff wastewater treatment plant with the IFFAS process: the pilot-scale and full-scale studies

2017 ◽  
Vol 77 (1) ◽  
pp. 70-78 ◽  
Author(s):  
Yanjun Mao ◽  
Xie Quan ◽  
Huimin Zhao ◽  
Yaobin Zhang ◽  
Shuo Chen ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Full Scale ◽  
Nitrification And Denitrification ◽  
Dyestuff Wastewater

Abstract The activated sludge (AS) process is widely applied in dyestuff wastewater treatment plants (WWTPs); however, the nitrogen removal efficiency is relatively low and the effluent does not meet the indirect discharge standards before being discharged into the industrial park's WWTP. Hence it is necessary to upgrade the WWTP with more advanced technologies. Moving bed biofilm processes with suspended carriers in an aerobic tank are promising methods due to enhanced nitrification and denitrification. Herein, a pilot-scale integrated free-floating biofilm and activated sludge (IFFAS) process was employed to investigate the feasibility of enhancing nitrogen removal efficiency at different hydraulic retention times (HRTs). The results showed that the effluent chemical oxygen demand (COD), ammonium nitrate (NH4+-N) and total nitrogen (TN) concentrations of the IFFAS process were significantly lower than those of the AS process, and could meet the indirect discharge standards. PCR-DGGE and FISH results indicated that more nitrifiers and denitrifiers co-existed in the IFFAS system, promoting simultaneous nitrification and denitrification. Based on the pilot results, the IFFAS process was used to upgrade the full-scale AS process, and the effluent COD, NH4+-N and TN of the IFFAS process were 91–291 mg/L, 10.6–28.7 mg/L and 18.9–48.6 mg/L, stably meeting the indirect discharge standards and demonstrating the advantages of IFFAS in dyestuff wastewater treatment.

Impact of Silica Nanoparticles on the Heterotrophic Denitrification

2014 ◽  
Vol 955-959 ◽  
pp. 175-179
Author(s):  
Lin Ying ◽  
Li Na ◽  
Yu Yang Zhou ◽  
Yin Jun
Keyword(s):  
Wastewater Treatment ◽  
Silica Nanoparticles ◽  
Nitrogen Removal ◽  
Laser Source ◽  
Power Laser ◽  
Positive Effects ◽  
Wide Range ◽  
Wastewater Systems ◽  
Source Materials ◽  
Denitrification Process

Silica nanoparticles (Si NPs) have a wide range of uses in semiconductors, battery cathode material, and high power laser source materials. However, Si NPs would flow into the wastewater treatment inevitably, and then potentially harmful interactions can occur between nanoparticles and wastewater systems, especially in denitrification process. The present study was aimed to investigate the effects of Si NPs on nitrate nitrogen removal under anaerobic conditions by employing activated sludge. Our data demonstrates that Si NPs had positive effects on denitrification at the beginning and did not display any measurable effect on nitrite nitrogen removal at the concentration of 100 mg/L and below. The denitrification process was elucidated by using the first-order reaction kinetics equation. This study provided useful data for understanding the effects of Si NPs on wastewater treatment.

Sign in / Sign up

Export Citation Format

Share Document