Initial carbon release characteristics, mechanisms and denitrification performance of a novel slow release carbon source

2022 ◽  
Vol 118 ◽  
pp. 32-45
Author(s):  
Congyu Li ◽  
Haiyan Wang ◽  
Guokai Yan ◽  
Weiyang Dong ◽  
Zhaosheng Chu ◽  
...  
Keyword(s):  
Carbon Source ◽  
Slow Release ◽  
Initial Carbon ◽  
Carbon Release

Comparison of denitrification performances using PLA/starch with different mass ratios as carbon source

2015 ◽  
Vol 71 (7) ◽  
pp. 1019-1025 ◽  
Author(s):  
Chuanfu Wu ◽  
Danqi Tang ◽  
Qunhui Wang ◽  
Juan Wang ◽  
Jianguo Liu ◽  
...  
Keyword(s):  
Carbon Source ◽  
Groundwater Remediation ◽  
Nitrate Concentration ◽  
Starch Content ◽  
Nitrate Removal ◽  
Carbon Sources ◽  
National Standard ◽  
Biofilm Carrier ◽  
Carbon Release ◽  
Biological Nitrate Removal

A suitable carbon source is significant for biological nitrate removal from groundwater. In this study, slow-release carbon sources containing polylactic acid (PLA) and starch at 8:2, 7:3, 6:4, 5:5, 4:6, and 3:7 ratios were prepared using a blending and fusing technique. The PLA/starch blend was then used as a solid carbon source for biological nitrate removal. The carbon release rate of PLA/starch was found to increase with increased starch content in leaching experiments. PLA/starch at 5:5 mass ratio was found to have the highest denitrification performance and organic carbon consumption efficiency in semi-continuous denitrification experiments, and was also revealed to support complete denitrification at 50 mg-N/L influent nitrate concentration in continuous experiments. The effluent nitrate concentration was <2 mg NO3–-N/L, which met the national standard (GB 14848-93) for groundwater. Scanning electron microscopy results further showed that the surface roughness of PLA/starch increased with prolonged experimental time, which may be conducive to microorganism attachment. Therefore, PLA/starch was a suitable carbon source and biofilm carrier for groundwater remediation.

scholarly journals Productivity feedback did not terminate the Paleocene-Eocene Thermal Maximum (PETM)

2010 ◽  
Vol 6 (2) ◽  
pp. 265-272 ◽  
Author(s):  
A. Torfstein ◽  
G. Winckler ◽  
A. Tripati
Keyword(s):  
Biological Pump ◽  
Accumulation Rates ◽  
Excess Carbon ◽  
Export Production ◽  
Initial Carbon ◽  
Thermal Maximum ◽  
Carbon Release ◽  
Rapid Removal ◽  
Sudden Release ◽  
A Site

Abstract. The Paleocene-Eocene Thermal Maximum (PETM) occurred approximately 55 million years ago, and is one of the most dramatic abrupt global warming events in the geological record. This warming was triggered by the sudden release of thousands of gigatons of carbon into the atmosphere and is widely perceived to be the best analogue for current anthropogenic climate change. Yet, the mechanism of recovery from this event remains controversial. A massive increase in the intensity of the marine biological pump ("productivity feedback") has been suggested to cause a drawdown of atmospheric CO2 and subsequent carbon sequestration in the ocean. A re-evaluation of the "productivity feedback hypothesis", based on biogenic barium mass accumulation rates (Ba-MARs) for a site in the Southern Ocean, finds that any increase in export production lagged the initial carbon release by at least ~70 000 years. This implies that export production did not facilitate rapid removal of excess carbon from the atmosphere. Thus, the most likely mechanism for carbon removal appears to be silicate weathering, which occurred at much slower rates than previously assumed.

scholarly journals Nitrogen Removal in Oligotrophic Reservoir Water by a Mixed Aerobic Denitrifying Consortium: Influencing Factors and Immobilization Effects

2019 ◽  
Vol 16 (4) ◽  
pp. 583 ◽  
Author(s):  
Hanyue Wang ◽  
Tong Wang ◽  
Shangye Yang ◽  
Xueqing Liu ◽  
Liqing Kou ◽  
...  
Keyword(s):  
Carbon Source ◽  
Simultaneous Removal ◽  
Source Water ◽  
Reservoir Water ◽  
Carbon And Nitrogen ◽  
Initial Carbon ◽  
Oligotrophic Water ◽  
Lower Temperature ◽  
Significant Attention ◽  
Immobilized Consortium

Nitrogen pollution in reservoirs has received increasing attention in recent years. Although a number of aerobic denitrifying strains have been isolated to remove nitrogen from eutrophic waters, the situation in oligotrophic water environments has not received significant attention. In this study, a mixed aerobic denitrifying consortium screened from reservoir samples was used to remove nitrogen in an oligotrophic denitrification medium and actual oligotrophic source water. The results showed that the consortium removed 75.32% of nitrate (NO3−-N) and 63.11% of the total nitrogen (TN) in oligotrophic reservoir water during a 24-h aerobic cultivation. More initial carbon source was helpful for simultaneous removal of carbon and nitrogen in the reservoir source water. NO3−-N and TN were still reduced by 60.93% and 46.56% at a lower temperature (10 °C), respectively, though the rates were reduced. Moreover, adding phosphorus promoted bacterial growth and increased TN removal efficiency by around 20%. The performance of the immobilized consortium in source water was also explored. After 6 days of immobilization, approximately 25% of TN in the source water could be removed by the carriers, and the effects could last for at least 9 cycles of reuse. These results provide a good reference for the use of aerobic denitrifiers in oligotrophic reservoirs.

Biological denitrification using polycaprolactone-peanut shell as slow-release carbon source treating drainage of municipal WWTP

Chemosphere ◽  
2019 ◽  
Vol 235 ◽  
pp. 434-439 ◽  
Author(s):  
Rui Xiong ◽  
Xinxiao Yu ◽  
Luji Yu ◽  
Zhaoxu Peng ◽  
Lulu Cheng ◽  
...  
Keyword(s):  
Carbon Source ◽  
Slow Release ◽  
Peanut Shell ◽  
Biological Denitrification

An innovative wood-chip-framework substrate used as slow-release carbon source to treat high-strength nitrogen wastewater

2017 ◽  
Vol 51 ◽  
pp. 275-283 ◽  
Author(s):  
Huai Li ◽  
Zifang Chi ◽  
Baixing Yan ◽  
Long Cheng ◽  
Jianzheng Li
Keyword(s):  
Carbon Source ◽  
Slow Release ◽  
Wood Chip ◽  
High Strength

scholarly journals Effects of HRT on the efficiency of denitrification and carbon source release in constructed wetland filled with bark

2017 ◽  
Vol 75 (12) ◽  
pp. 2908-2915 ◽  
Author(s):  
Yinghe Jiang ◽  
Yao Li ◽  
Ying Zhang ◽  
Xiangling Zhang
Keyword(s):  
Carbon Source ◽  
Removal Efficiency ◽  
Constructed Wetland ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Municipal Sewage ◽  
First Order ◽  
N Removal ◽  
Carbon Release ◽  
The Relationship

Constructed wetland is widely used to treat municipal sewage. However, lack of carbon source always constraints the application of constructed wetland in advanced tailwater treatment process. Bark was used as the filler and external carbon source of constructed wetland in the study, and the effects of hydraulic retention time (HRT) on NO3−−N removal efficiency and carbon release velocity were explored. Results showed that the NO3−−N removal process was steady in the constructed wetland filled with bark without additional carbon source. The NO3−−N removal efficiency and NO3−−N concentration presented a first-order reaction. The reaction rate constant k was 0.4 day−1. The relationship between NO3−−N removal efficiency (η) and HRT (t) was η = 1-e−0.4t, and η was increased with increasing of HRT. η reached a maximum of 77% at HRT of 4.48 days. η obtained the minimum of 20% at HRT of 0.75 days. The relationship between the carbon source releasing velocity (v) by bark and HRT was v = 0.53(1.62/t-1/t2) + 0.32. v increased first and then decreased with HRT increasing. The maximum v was detected at t = 1.12 days.

scholarly journals Enhance nitrogen removal in bioretention cells with addition of hydrothermal pre-treated pine barks as external carbon source

2021 ◽  
Author(s):  
Jing Tuo ◽  
Shiwei Cao ◽  
Muzi Li ◽  
Rong Guo
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Common Factor ◽  
Nutrients Removal ◽  
Fiber Structure ◽  
Effluent Quality ◽  
External Carbon Source ◽  
Carbon Release ◽  
Cod Removal Rate

Abstract The problem of poor carbon source is a common factor limiting the nutrients removal in bioretention cells (BRCs). This study aimed to investigate the feasibility of using modified biomass in BRCs filled with a mixture of fly ash ceramsite and pumice fillers to enhance nitrogen removal. Different pretreatment methods (hydrothermal-treated, acid-treated and alkali-treated) were attempted, and hydrothermal pretreatment showed a best performance in carbon release ability. The scanning electron microscopy showed that the lignin in hydrothermal pretreated pine barks (H-PBs) was destroyed, and the fiber structure became thinner with more irregular folds, which improved the accessibility of cellulose and attachment of microorganisms. The addition of H-PBs significantly enhanced the nutrients removal in BRCs, and the removal rates of TN and NO3−-N increased by 23.25% and 38.22% compared with those in BRC-A (without external carbon source), but the removal rate of NH4+-N was inferior to BRC-A. Besides, the large carbon release amount of H-PBs did not deteriorate the effluent quality, with COD removal rate of 87.98% in the 48 d. These results indicate that the BRCs by adding H-PBs could intensify the denitrification process.

An Innovative Double-Layer Microsphere Used as Slow-Release Carbon Source for Biological Denitrification

2020 ◽  
Vol 231 (3) ◽  
Author(s):  
Yunxiao Xing ◽  
Dan Zhang ◽  
Li Cai ◽  
Yifei Xie ◽  
Ling Wang ◽  
...  
Keyword(s):  
Carbon Source ◽  
Double Layer ◽  
Slow Release ◽  
Biological Denitrification

Nutrient balances for combined nitrification and denitrification in biofilters

2000 ◽  
Vol 41 (4-5) ◽  
pp. 91-95
Author(s):  
B. Zwerger ◽  
E. Arnold ◽  
P.A. Wilderer
Keyword(s):  
Carbon Source ◽  
Nitrogen Balance ◽  
Phosphorus Loading ◽  
Phosphorus Load ◽  
Treatment Efficiency ◽  
Nutrient Balances ◽  
Initial Carbon ◽  
Set Up ◽  
Efficiency Data ◽  
Carbon Loading

Nutrient balances were set up for a biofiltration pilot plant operated with pre-denitrification and post-nitrification in order to gain more information about its treatment efficiency. Data collected during several weeks was used for balancing the parameters phosphorus (Ptot), carbon (COD) and nitrogen (Ntot). From the results obtained (overall deviation of 20–30%) it can be stated that 30% of the phosphorus load in the inlet was incorporated into biomass or sludge. The effluent contained between 50 and 80% of the incoming phosphorus loading. The percentage of the initial carbon loading found by sludge analysis was in the range of 60 to 80% and about 20% were measured in the effluent. Thus, only 20 to 40% were oxidized and/or utilized as carbon source for denitrification. The nitrogen balance showed similar values for incorportion as determined for phosphorus (20–40%). As not more than 20% of the incoming nitrogen load could be denitrified, 40–60% left the plant with the effluent.

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