Removal of nitrogen from coal gasification wastewater by nitrosofication and denitrosofication

1998 ◽  
Vol 38 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Junxin Liu ◽  
Weiguang Li ◽  
Xiuheng Wang ◽  
Hongyuan Liu ◽  
Baozhen Wang
Keyword(s):  
Nitrogen Removal ◽  
Coal Gasification ◽  
Oxygen Demand ◽  
Test Results ◽  
New Process ◽  
Scale Test ◽  
Coal Gasification Wastewater ◽  
Total Nitrogen Removal ◽  
Biological Nitrogen ◽  
Bench Scale Test

In this paper, a study of a new process with nitrosofication and denitrosofication for nitrogen removal from coal gasification wastewater is reported. In the process, fibrous carriers were packed in an anoxic tank and an aerobic tank for the attached growth of the denitrifying bacteria and Nitrobacter respectively, and the suspended growth activated sludge was used in an aerobic tank for the growth of Nitrosomonas. A bench scale test has been carried out on the process, and the test results showed that using the process, 25% of the oxygen demand and 40% of the carbon source demand can be saved, and the efficiency of total nitrogen removal can increase over 10% as compared with a traditional process for biological nitrogen removal.

scholarly journals Simultaneous nitrification and denitrification (SND) bioaugmentation with Pseudomonas sp. HJ3 inoculated for enhancing phenol and nitrogen removal in coal gasification wastewater

2019 ◽  
Vol 80 (8) ◽  
pp. 1512-1523
Author(s):  
Weiwei Ma ◽  
Yuxing Han ◽  
Wencheng Ma ◽  
Hongjun Han ◽  
Chunyan Xu ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Coal Gasification ◽  
Oxygen Demand ◽  
Community Analysis ◽  
Microbial Community Analysis ◽  
Simultaneous Nitrification And Denitrification ◽  
Pseudomonas Sp ◽  
Coal Gasification Wastewater ◽  
Nitrification And Denitrification

Abstract A simultaneous nitrification and denitrification (SND) bioaugmention system with Pseudomonas sp. HJ3 inoculated was established to explore the potential of simultaneous phenol and nitrogen removal in coal gasification wastewater (CGW). When the concentration of influent chemical oxygen demand (COD) and total phenols (TPh) was 1,765.94 ± 27.43 mg/L and 289.55 ± 10.32 mg/L, the average removal efficiency of COD and TPh at the stable operating stage reached 64.07% ± 0.76% and 74.91% ± 0.33%, respectively. Meanwhile, the average removal efficiency of NH4+-N and total nitrogen (TN) reached 67.96% ± 0.17% and 57.95% ± 0.12%, respectively. The maximum SND efficiency reached 83.51%. Furthermore, SND bioaugmentation performed with good nitrification tolerance of phenol shock load and significantly reduced toxic inhibition of organisms. Additionally, the microbial community analysis indicated that Pseudomonas sp. HJ3 was the predominant bacterium in the SND bioaugmentation system. Moreover, the indigenous nitrogen removal bacteria such as Thauera, Acidovorax and Stenotrophomonas were enriched, which further enhanced the nitrogen removal in the SND bioaugmentation system. The results demonstrated the promising application of SND bioaugmentation for enhancing simultaneous phenol and nitrogen removal in CGW treatment.

scholarly journals Strategies for recovering inhibition caused by phenolic compounds in a short-cut nitrogen removal reactor treating coal gasification wastewater

2015 ◽  
Vol 5 (4) ◽  
pp. 569-578 ◽  
Author(s):  
Qian Zhao ◽  
Hongjun Han ◽  
Fang Fang ◽  
Haifeng Zhuang ◽  
Dexin Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Phenolic Compounds ◽  
Nitrogen Removal ◽  
Coal Gasification ◽  
Activated Carbons ◽  
Powdered Activated Carbon ◽  
Nitrifying Bacteria ◽  
Quick Recovery ◽  
Coal Gasification Wastewater ◽  
Biological Nitrogen

Different strategies, including extension of hydraulic retention time (HRT), dilution, and addition of powdered activated carbon (PAC) and super-powdered activated carbon (S-PAC), were investigated for the quick recovery of nitrifying bacteria activity from the inhibition of coal gasification wastewater (CGW). A laboratory-scale short-cut biological nitrogen removal (SBNR) reactor treating CGW, achieving high levels (90%) of nitrogen removal, was used. After a shock of phenolic compounds (around 250 mg/L) and a failed performance, the results of the batch recovery tests indicated that the PAC and S-PAC addition were the best recovery strategies. In the SBNR reactor, the addition of 1 g/L PAC and S-PAC shortened the recovery time from the natural recovery of 32 days to 13 days and 10 days, respectively. Fluorescence in situ hybridization (FISH) assay and the adsorption isotherms revealed that activated carbons absorbed phenolic compounds, reducing the toxicity and allowing for the quick recovery of SBNRs treating CGW. S-PAC showed greater adsorption capacity for phenol than PAC.

Characterization of slowly-biodegradable organic compounds and hydrolysis kinetics in tropical wastewater for biological nitrogen removal

2020 ◽  
Vol 81 (1) ◽  
pp. 71-80 ◽  
Author(s):  
Seow Wah How ◽  
Jia Huey Sin ◽  
Sharon Ying Ying Wong ◽  
Pek Boon Lim ◽  
Alijah Mohd Aris ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Uptake Rate ◽  
Wastewater Treatment Plants ◽  
Oxygen Demand ◽  
Hydrolysis Rate ◽  
Biological Nitrogen Removal ◽  
Tropical Region ◽  
Kinetic Coefficients ◽  
Wastewater Samples ◽  
Biological Nitrogen

Abstract Many developing countries, mostly situated in the tropical region, have incorporated a biological nitrogen removal process into their wastewater treatment plants (WWTPs). Existing wastewater characteristic data suggested that the soluble chemical oxygen demand (COD) in tropical wastewater is not sufficient for denitrification. Warm wastewater temperature (30 °C) in the tropical region may accelerate the hydrolysis of particulate settleable solids (PSS) to provide slowly-biodegradable COD (sbCOD) for denitrification. This study aimed to characterize the different fractions of COD in several sources of low COD-to-nitrogen (COD/N) tropical wastewater. We characterized the wastewater samples from six WWTPs in Malaysia for 22 months. We determined the fractions of COD in the wastewater by nitrate uptake rate experiments. The PSS hydrolysis kinetic coefficients were determined at tropical temperature using an oxygen uptake rate experiment. The wastewater samples were low in readily-biodegradable COD (rbCOD), which made up 3–40% of total COD (TCOD). Most of the biodegradable organics were in the form of sbCOD (15–60% of TCOD), which was sufficient for complete denitrification. The PSS hydrolysis rate was two times higher than that at 20 °C. The high PSS hydrolysis rate may provide sufficient sbCOD to achieve effective biological nitrogen removal at WWTPs in the tropical region.

scholarly journals From Bench-scale Test Data To Predictors Of Full-scale Fire Test Results

2005 ◽  
Vol 8 ◽  
pp. 469-480 ◽  
Author(s):  
S. Nam ◽  
J. De Ris ◽  
Peter Wu ◽  
R. Bill
Keyword(s):  
Test Data ◽  
Fire Test ◽  
Full Scale ◽  
Test Results ◽  
Bench Scale ◽  
Scale Test ◽  
Bench Scale Test

Intermittent Aeration for Nitrogen Removal in Small Oxidation Ditches

1990 ◽  
Vol 22 (3-4) ◽  
pp. 131-138 ◽  
Author(s):  
Hiroyuki Araki ◽  
Kenichi Koga ◽  
Katsuto Inomae ◽  
Tetsuya Kusuda ◽  
Youichi Awaya
Keyword(s):  
Nitrogen Removal ◽  
Cycle Time ◽  
Test Plant ◽  
Nitrification Rate ◽  
Oxidation Ditch ◽  
Intermittent Aeration ◽  
Tank Model ◽  
Scale Test ◽  
Total Nitrogen Removal ◽  
Removal Processes

An intermittent aeration method is available for nitrogen removal in a small oxidation ditch. The purpose of this study is to establish a basis for design and operation of the oxidation ditch with the intermittent aeration method. Discussions on the essential process parameters depending on cycle time tc, aerobic period ta, specific nitrification rate vn and specific denitrification rate vd were carried out by using a continuous-flow stirred-tank model. It is shown theoretically that an optimum range of the aerobic time ratio (ta/tc) for nitrogen removal exists in the region of 1/v n* to 1-1/vd*. From evaluating an amount of leaking nitrogen in the intermittent aeration, the cycle time is proved to be minimized. Experiments in a full scale test plant were conducted to affirm the validity of the proposed basis. It is confirmed that the total nitrogen removal efficiency of 90% is achieved and the estimated removal efficiencies by this basis agree well with the experimental data. The newly proposed basis and parameters for nitrogen removal using the intermittent aeration method are available for not only an oxidation ditch but also other nitrogen removal processes by single sludge systems.

scholarly journals Effect of powdered activated carbon technology on short-cut nitrogen removal for coal gasification wastewater

2013 ◽  
Vol 142 ◽  
pp. 179-185 ◽  
Author(s):  
Qian Zhao ◽  
Hongjun Han ◽  
Chunyan Xu ◽  
Haifeng Zhuang ◽  
Fang Fang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Nitrogen Removal ◽  
Coal Gasification ◽  
Powdered Activated Carbon ◽  
Coal Gasification Wastewater

scholarly journals Biological treatment of leachate from stabilization of biodegradable municipal solid waste in a sequencing batch biofilm reactor

2020 ◽  
Author(s):  
K. Bernat ◽  
M. Zaborowska ◽  
M. Zielińska ◽  
I. Wojnowska-Baryła ◽  
W. Ignalewski
Keyword(s):  
Municipal Solid Waste ◽  
Chemical Oxygen Demand ◽  
Solid Waste ◽  
Oxygen Content ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Synthetic Wastewater ◽  
Total Nitrogen Removal

Abstract The aim of this study was to determine the effectiveness of pollutant removal in sequencing batch biofilm reactors (with floating or submerged carriers) when treating nitrogen- and organic-rich real leachate generated during aerobic stabilization of the biodegradable municipal solid waste. A control reactor contained suspended activated sludge. The share of leachate in synthetic wastewater was 10%, which resulted in ratios of chemical oxygen demand and biochemical oxygen demand to total Kjeldahl nitrogen in the influent of ca. 11 and ca. 8.5, respectively. Regardless of whether the reactors contained carriers or not, the effectiveness of nitrification (84.2–84.3%) and of the removal of chemical oxygen demand (86.5–87.0%), biochemical oxygen demand (95.5–98.0%) and ammonium (88.9–89.3%) did not differ. However, the presence of carriers and their type determined in which phase of the cycle denitrification occurred. In the control reactor, denitrification took place during mixing phase with the effectiveness of ca. 43.2% (57.7% of the total nitrogen removal). During aeration, the oxygen content increased rapidly, thus reduced the possibility of simultaneous denitrification. In reactors with carriers, in the aeration phase, not only nitrification but also denitrification occurred. The increase in oxygen content in wastewater was slower, which could have caused dissolved oxygen gradients and anoxic zones in deeper layers of the biofilm and flocks. In the reactor with floating carriers, the effectiveness of denitrification and total nitrogen removal increased 1.23- and 1.10-times, respectively, as compared to the control reactor. The highest efficiencies (67.7% and 73.0%, respectively) were observed in the reactor with submerged carriers.

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