scholarly journals Enhanced quinoline removal by zero-valent iron-coupled novel anaerobic processes: performance and underlying function analysis

RSC Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 1176-1186 ◽  
Author(s):  
Sufang Wang ◽  
Aijuan Zhou ◽  
Jiaguang Zhang ◽  
Zhaohua Liu ◽  
Jierong Zheng ◽  
...  
Keyword(s):  
Methane Production ◽  
Function Analysis ◽  
Zero Valent Iron ◽  
Anaerobic Processes ◽  
Different Types

The addition of different types of ZVI affects the efficiency of quinoline degradation and methane production in WAS digestion.

scholarly journals Impact of Nanoscale Magnetite and Zero Valent Iron on the Batch-Wise Anaerobic Co-Digestion of Food Waste and Waste-Activated Sludge

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1283 ◽  
Author(s):  
Ghada Kassab ◽  
Dima Khater ◽  
Fadwa Odeh ◽  
Khaldoun Shatanawi ◽  
Maha Halalsheh ◽  
...  
Keyword(s):  
Methane Production ◽  
Iron Nanoparticles ◽  
Positive Impact ◽  
Zero Valent Iron ◽  
Production Yield ◽  
Iron Particles ◽  
Magnetite Fe3o4 ◽  
Different Types ◽  
Nano Zero Valent Iron ◽  
The Impact

As a potential approach for enhanced energy generation from anaerobic digestion, iron-based conductive nanoparticles have been proposed to enhance the methane production yield and rate. In this study, the impact of two different types of iron nanoparticles, namely the nano-zero-valent-iron particles (NZVIs) and magnetite (Fe3O4) nanoparticles (NPs) was investigated, using batch test under mesophilic conditions (35 °C). Magnetite NPs have been applied in doses of 25, 50 and 80 mg/L, corresponding to 13.1, 26.2 and 41.9 mg magnetite NPs/gTS of substrate, respectively. The results reveal that supplementing anaerobic batches with magnetite NPs at a dose of 25 mg/L induces an insignificant effect on hydrolysis and methane production. However, incubation with 50 and 80 mg/L magnetite NPs have instigated comparable positive impact with hydrolysis percentages reaching approximately 95% compared to 63% attained in control batches, in addition to a 50% enhancement in methane production yield. A biodegradability percentage of 94% was achieved with magnetite NP doses of 50 and 80 mg/L, compared to only 62.7% obtained with control incubation. NZVIs were applied in doses of 20, 40 and 60 mg/L, corresponding to 10.8, 21.5 and 32.2 mg NZVIs/gTS of substrate, respectively. The results have shown that supplementing anaerobic batches with NZVIs revealed insignificant impact, most probably due to the agglomeration of NZVI particles and consequently the reduction in available surface area, making the applied doses insufficient for measurable effect.

scholarly journals Identification of naturally available forage species and their feeding effect on dairy cows in different climatic vulnerable areas of Bangladesh

2017 ◽  
Vol 46 (2) ◽  
pp. 150-158
Author(s):  
SMR Rahman ◽  
NR Sarker ◽  
MR Amin ◽  
M Kamruzzaman ◽  
MR Haque
Keyword(s):  
Milk Production ◽  
Methane Emission ◽  
Methane Production ◽  
Check List ◽  
Climatic Zones ◽  
Forage Species ◽  
Different Types ◽  
Prone Area ◽  
Flood Prone Area ◽  
Drought Prone Area

An investigation was carried out with the objectives to identify the naturally occurring forage species, seasonal availability, production patterns under different climatic zones and production performance and methane emission from dairy cow under existing feeding systems. For this purpose, three different agro-climatic zones of Bangladesh, namely saline prone area (Satkhira), flood plain/river basin areas (Pabna), semi-arid/drought prone areas (Chapainobabgonj) were selected. To achieve the objectives, three Focus Group Discussions (FGD) were conducted in each location to obtain more information from different age groups of farmers. A total of 9 FDGs were conducted under three selected locations and twelve participants were attended in each FGD. During FDGs, information was collected through participatory discussions through check list and also discussion was recorded to verify the information gathered as per check list.  After collection of information in each side, all the data were checked and analyzed. The results indicated that in saline area, farmers reported that different types of local grass e.g. Tale Shapna,Durba,Nona Shapna, Khud Gate/ KhudKhachra, Shama, Full Paira, Bass Pata, Math Pora/KhataShak, GhimeeShak and Baksha etc were available round the year but according to their observation Nona Shapna, Tale Shapna and Baksha were more available compared to other species of the natural grasses and these three natural forages are more suitable in this area. In the drought prone area, different types of native grasses e.g. Durba,Shama, Mutha,Katla,Kausha/Kannar, Binna, Datuloka,Shanchi, Shunshue, Bash Batari, Ulo and Binna Pati were identified and utilized by the farmers in different seasons but Durba,Katla and Mutha were found more drought tolerant compared to other species. In flood prone area, Kolmi, Shanti, Baksha, Arail, Dubla, Bokma, Vadail and Bolenga etc were found and Kolmi, Baksha and Arail are more suitable in this area. Farmers were also reported that fodder tree like Dumur/khoksha also is survive in water logging situation and or flood prone area. The study revealed that calculated total DMI (Kg/h/day) was the highest (14.14±1.06) in flood prone  followed by drought (13.80±1.30) and saline areas (4.43±0.20),  respectively. Similarly, the milk production was also higher (12.06±1.19 litre/h/day) in flood prone area followed by drought (4.47±0.60 litre/h/day) and saline (1.83±0.11 litre/h/day) areas, respectively. The calculated total methane emission (g/h/d) was significantly higher in flood prone (478.31±36.36) and the lowest in saline (153.35±7.14) prone areas. Whereas, methane production per unit of milk yield, was the lowest in flood prone (46.55±6.78) and the highest (110.48±21.69) in drought prone area and the difference was statistically significant (p<0.05).  Therefore, it may be concluded that farmers’ rearing animals under climate vulnerable areas utilizing natural grasses are more prone to higher methane production compared to animals rearing better feed resources though their availability was varied with the seasons and locations.  Hence, further research is needed to explore more suitable natural grasses in addition to introduction of high yielding fodder with higher biomass and nutritive values based on the existing cropping systems in those climate vulnerable areas for higher milk production and low enteric methane emission in the country.Bang. J. Anim. Sci. 2017. 46 (2): 150-158

scholarly journals Degradation of Tris(1-chloro-2-propanyl) Phosphate by the Synergistic Effect of Persulfate and Zero-valent Iron During a Mechanochemical Process

2021 ◽  
Author(s):  
Weichuan Qiao ◽  
Qiwen Yang ◽  
Yi Qian ◽  
Ziyan Zhang
Keyword(s):  
Synergistic Effect ◽  
Flame Retardants ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Degradation Pathway ◽  
Reduction Reaction ◽  
Zero Valent Iron ◽  
Oh Radicals ◽  
Different Types ◽  
Dual Pathway

Abstract This study revealed a dual pathway for the degradation of tris (1-chloro-2-propanyl) phosphate (TCPP) by zero-valent iron (ZVI) and persulfate as co-milling agents in a mechanochemical (MC) process. Persulfate was activated with ZVI to degrade TCPP in a planetary ball mill. After milling for 2 h, 96.5% of the TCPP was degraded with the release of 63.16, 50.39 and 42.01% of the Cl−, SO42− and PO43−, respectively. In the first degradation pathway, persulfate was activated with ZVI to produce hydroxyl (·OH) radicals and ZVI is oxidized to Fe(Ⅱ) and Fe(Ⅲ). A substitution reaction occurred as a result of the attack of ·OH on the P–O–C bonds, leading to the successive breakage of the three P–O–C bonds in TCPP to produce PO43−. In the second pathway, a C–Cl bond in part of the TCPP molecule was oxidized by SO4·− to carbonyl and carboxyl groups. The P–O–C bonds continued to react with ·OH to produce PO43−. Finally, the intermediate organochloride products were further reductively dechlorinated by ZVI. However, the synergistic effect of the oxidation (·OH and SO4·−) and the reduction reaction (ZVI) did not completely degrade TCPP to CO2, resulting in a low mineralization rate (35.87%). Moreover, the intermediate products still showed the toxicities in LD50 and developmental toxicant. In addition, the method was applied for the degradation of TCPP in soil, and high degradations (>83.83%) were achieved in different types of soils.Speciality: Phosphorus flame retardants; Advanced oxidation process; Ball milling

Feasibility tests for treating shampoo and hair colorant wastewaters using anaerobic processes

2012 ◽  
Vol 65 (2) ◽  
pp. 303-308 ◽  
Author(s):  
Shaikh Z. Ahammad ◽  
A. Yakubu ◽  
J. Dolfing ◽  
C. Mota ◽  
D. W. Graham
Keyword(s):  
Methane Production ◽  
Biological Treatment ◽  
Anaerobic Treatment ◽  
Energy Costs ◽  
Net Energy ◽  
Personal Care ◽  
Anaerobic Processes ◽  
Personal Care Product ◽  
Anaerobic Reactors ◽  
Treatment Technologies

Wastes from the personal care product (PCP) industry are often high in biodegradable carbon, which makes them amenable to aerobic biological treatment, although process costs are usually high due to aeration inefficiencies, high electricity demand and production of large amounts of sludge. As such, anaerobic treatment technologies are being considered to lower net energy costs by reducing air use and increasing methane production. To assess the amenability of PCP wastes to anaerobic treatment, methane yields and rates were quantified in different anaerobic reactors treating typical PCP wastes, including wastes from shampoo and hair colorant products. Overall, shampoo wastes were more amenable to methanogenesis with almost double the methane yields compared with colour wastes. To assess relevant microbial guilds, qPCR was performed on reactor biomass samples. Methanosaetaceae abundances were always significantly higher than Methanosarcinaceae and Methanomicrobiales abundances (P &lt; 0.05), and did not differ significantly between waste types. Although colour wastes were less amenable to anaerobic treatment than shampoo wastes, differences cannot be explained by relative microbial abundances and probably result from the presence of inhibiting compounds in hair colorants (e.g., oxidants) at higher levels. Results showed that anaerobic technologies have great potential for treating PCP wastes, but additional work is needed to establish the basis of elevated methane yields and inhibition, especially when colorant wastes are present.

scholarly journals Zero valent iron enhances methane production from primary sludge in anaerobic digestion

2018 ◽  
Vol 351 ◽  
pp. 1159-1165 ◽  
Author(s):  
Wei Wei ◽  
Zhengqing Cai ◽  
Jie Fu ◽  
Guo-Jun Xie ◽  
Ang Li ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Zero Valent Iron ◽  
Primary Sludge
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