scholarly journals Characterization of Burning Behaviors and Particulate Matter Emissions of Crop Straws Based on a Cone Calorimeter

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3407
Author(s):  
Wei Song ◽  
Yanrong He ◽  
Yuzhang Wu ◽  
Wei Qu
Keyword(s):  
Particulate Matter ◽  
Wheat Straw ◽  
Rice Straw ◽  
Cone Calorimeter ◽  
Crop Residues ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Corn Straw ◽  
Network Chain ◽  
The Difference

Crop residue burning is one of the major sources of particulate matter (PM) in the air. The burning behaviors and PM emissions of the three typical crop residues (rice straw, wheat straw, corn straw) in China were characterized by a cone calorimeter (CONE) coupled with a laser dust meter. The water-soluble compounds, carbonaceous content, and morphology of PM were measured by ion chromatography, elemental analyzer, transmission electron microscopy (TEM) and energy-dispersive X-ray spectrometer (EDS). The results showed that thermal stability of corn straw was the worst among the three crop straws. The heat release rate (HRR) curves of the three crop straws were the typical curves of thermally thick charring (residue forming) samples. Wheat straw had the highest smoke yield, which was 2.9 times that of rice straw. The PM emission factor of wheat straw was 180.91 µg/g, which was about three times that of rice straw. The contents of K+, Na+, and Cl− in PM were significantly higher than those of the other six water-soluble inorganic ions. The ratio of organic carbon and elemental carbon (OC/EC) ranged from 14.82 to 30.82, which was similar to the results of open burning. There were mainly three kinds of aggregates in the PM of crop straws: network, chain-like, and soot. Individual particles were mixtures of KCl and organic matters. Core-shell structures were found in PM of rice straw and corn straw. The results in this study were provided based on CONE, an ISO-standard apparatus, which could avoid data conflicts caused by the difference of combustion devices. The relationship between the burning behavior and PM emission characteristics of crop straws was established, which is helpful to understand emissions of crop straws and to find a novel way to solve the problems from the burning of crop residues.

scholarly journals KECERNAAN NDF DAN ADF YANG MENDAPAT SUPLEMENTASI UREA MOLASSES MULTINUTRIENT BLOCK (UMMB) DARI BEBERAPA JENIS LIMBAH PERTANIAN DAN RUMPUT LAPANG PADA SAPI PERANAKAN ONGOLE (PO)

ZOOTEC ◽  
2018 ◽  
Vol 38 (2) ◽  
pp. 320
Author(s):  
Giandi Grahadi Turangan ◽  
B. Tulung ◽  
Y.R.L. Tulung ◽  
M.R. Waani
Keyword(s):  
Body Weight ◽  
Organic Matter ◽  
Rice Straw ◽  
Dry Matter ◽  
Crop Residues ◽  
Latin Square ◽  
Crossbred Cattle ◽  
Corn Straw ◽  
Peanut Straw

NDF AND ADF DIGESTIBILITY WHICH GET THE SUPPLEMENTED UREA MOLASSES MULTINUTRIENT BLOCK (UMMB) OF SOME CROP RESIDUES TYPE AND LOCAL GRASS ON ONGOLE CROSSBRED CATTLE. A research evaluating dry matter (DM) and organic matter (OM) digestibility of crops residues and local grass supplemented urea molasses multinutrient block (UMMB) on Ongole crossbred cattle (PO). Four male PO cattle, 12 – 18 months of age with ± 100 kg of body weight were used in this experiment. Latin Square Design 4 x 4 with 4 cows and 4 treatments was used. The treatments were : R1 : UMMB + local grass, R2: UMMB + Corn straw, R3: UMMB + Rice straw, and R4: UMMB + peanut straw. The results showed that there were significant effect (P<0.01) of treatments on NDF and ADF digestibility. C1 showed that NDF and ADF digestibility of local grass (68.44% and 61.37%) were higher (P<0.05) compared to crop residues (corn straw 65.25% and 58.59%, rice straw 62.63% dan 52.80%, and peanut straw 67.53% and 59.81%) respectively. C2 showed that NDF and ADF digestibility of legume straw was higher than grasses straw; and C3 showed that  NDF and ADF digestibility of rice straw was lower than corn straw. The results have concluded that : 1. NDF and ADF digestibility of local grass were higher compared to crop residues. 2. NDF and ADF digestibility of legume straw (peanut straw) was higher than grasses straw  (corn straw and ricce straw);3. NDF and ADF digestibility of  corn straw was higher than peanut straw.Key words: NDF and ADF digestibility, crop residues, UMMB, ongole crossbred cattle

scholarly journals Tillage, Green Manure And Residue Retention Improve Aggregate-Associated Phosphorus Fractions Under Rice-Wheat Cropping

2021 ◽  
Author(s):  
Sandeep Sharma ◽  
Sukhjinder Kaur ◽  
Om Parkash Choudhary
Keyword(s):  
Wheat Straw ◽  
Rice Straw ◽  
Green Manure ◽  
Management Practices ◽  
Crop Residues ◽  
Nutrient Use Efficiency ◽  
Phosphorus Fractions ◽  
Residue Management ◽  
Wheat Crop ◽  
Western India

Abstract The sustainability of rice-wheat system (RWS) in north-western India is threatened due to the deterioration of soil health and emergence of new challenges of climate change caused by low nutrient use efficiency and large scale burning of crop residues. Phosphorus and phosphatase activities in the soil aggregates affected by different residue management practices remain poorly understood. Thus, soil samples were obtained after a five year field experiment to identify the effect of tillage, green manure and residue management on aggregate-associated phosphorus fractions. In rice, the main plot treatments were combinations of wheat straw and Sesbania green manure (GM) management: (1) puddled transplanted rice (PTR) with no wheat straw (PTRW0), (2) PTR with 25% wheat stubbles (12-15 cm long) retained (PTRW25), (3) PTR without wheat straw and GM (PTRW0+GM), and (4) PTR with wheat stubbles (25%) and GM (PTRW25+GM). Three sub-plots treatments in the successive wheat crop were (1) conventional tillage with rice straw removed (CTWR0), (2) zero tillage (ZT) with rice straw removed (ZTWR0) and (3) ZT with 100% rice straw retained as surface mulch (ZTWR100). Results of the present study revealed that all phosphorus fractions were significantly higher in PTRW25+GM followed by ZTWR100 compared with PTRW0/CTWR0 treatment within both macro- and micro-aggregates. The total phosphorus (P), available P, alkaline phosphatase and phytin-P were significantly higher under ZTWR100 than CTWR0. Principal component analysis identified NaOH-Po, NaHCO3-Pi and HCl-P as the dominant and reliable indicators for evaluating P transformation within aggregates under conservation agriculture based practices.

scholarly journals Investigating Day and Nighttime Variability of Major Water-Soluble Inorganic Species and Role of Reactive Nitrogen Species in PM2.5 and PM10 - A Two Year Study

2021 ◽  
Vol Special Issue (1) ◽  
pp. 32-44
Author(s):  
Subhash Chandra ◽  
Monika J Kulshrestha ◽  
Ruchi Singh
Keyword(s):  
Particulate Matter ◽  
Reactive Nitrogen Species ◽  
Ionic Species ◽  
Water Soluble ◽  
Reactive Nitrogen ◽  
Nitrogen Species ◽  
Inorganic Species ◽  
The Difference ◽  
Pm2.5 And Pm10

The study reports day and nighttime temporal variation of prominent water-soluble inorganic species (WSIS) of fine and coarse mode particulate matter at a site in central Delhi for 2012 and 2013. The two years’ concentrations of major ionic species (NH4+, K+, Ca2+ and Mg2+ and NO3-, SO42-) showed that mean levels of both ∑cations and ∑anions were higher in nighttime than daytime in both PM2.5 and PM10. Moreover, the difference of mean levels in daytime and nighttime was noticed higher in PM2.5 compared to PM10. Among anions, more variation was observed for NO3-, i.e., ~49% higher level in nighttime compared to daytime, while~9% higher values in the nighttime for SO42-. Higher variation of NO3- level might be due to active participation of NOx in daytime photo-oxidation process. Among cations,Ca2+ and Mg2+ showed higher concentration in daytime compared to nighttime. Higher day and nighttime variation of Ca2+ and Mg2+ in coarse particulate matter suggested their dominance in PM10 compared to PM2.5. In PM10, the highest Ca2+ concentration was observed in daytime summer and least in nighttime monsoon, indicating the role of loose soil and meteorological conditions. The higher daytime SO42- concentration in monsoon compared to summer show edits significant formation as secondary aerosols in fine mode. The reactive nitrogen species NO3- and NH4+ were correlated during the day and nighttime in PM2.5 and PM10.Moreover, NH4+ was highly correlated to SO42- and NO3-, mainly in the form of (NH4)2SO4 and NH4NO3.

Multifaceted approach to determine rice straw phytotoxicity

2004 ◽  
Vol 82 (2) ◽  
pp. 168-176 ◽  
Author(s):  
Inderjit ◽  
Dhiraj S Rawat ◽  
Chester L Foy
Keyword(s):  
Root Growth ◽  
Rice Straw ◽  
Seedling Growth ◽  
Oryza Sativa L ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Total Phenolic ◽  
Inhibitory Effects ◽  
Soluble Phenolics ◽  
Maximum Inhibition

Unharvested rice (Oryza sativa L.) straw gets incorporated into soil and interferes with the growth of the next season's crop. Water-soluble phenolics leached from straw into soil may suppress the growth of the next crop. A study was carried out to investigate (i) the effect of soil treated with rice straw (ashes of burned and unburned) leachates on seedling growth and foliar protein content of mustard (Brassica napus var. toria L.), (ii) the modification of rice straw phytotoxicity with abiotic soil, activated charcoal, and nitrogen solution, and (iii) any change in soil inorganic ions and phenolics after treatment with rice straw leachate. Maximum inhibition in root growth of mustard was observed when it was grown in soil treated with leachate prepared by using 100 g of unburned (71.1%, expt. 1; 60.2%, expt. 2) and ashes of burned straw (53.4%, expt. 1; 31.5%, expt. 2). Compared with the untreated control, an increase was observed in the total phenolic content of soil treated with straw leachate, prepared by taking 100, 80, 60, 40, and 20 g unburned straw. When soils were treated with leachate prepared by taking 100, 80, and 60 g straw, a lower level of inhibition was observed in abiotic soil compared with biotic soil. An opposite trend was observed when soil was treated with leachate prepared by taking 40 and 20 g straw. The addition of charcoal eliminated the inhibitory effects of rice straw leachate when leachates were prepared using 40 and 20 g straw. Inhibitory effects of soil treated with leachate prepared from 100 g straw on root growth of mustard were not eliminated after the addition of nitrogen solution. The present study showed that rice straw leachate interferes with seedling growth of mustard and that water-soluble phenolics play an important role in mustard seedling growth inhibition.Key words: allelopathy, rice straw, rice, mustard, phenolics.

scholarly journals Liquefaction of crop residues for polyol production

BioResources ◽  
2006 ◽  
Vol 1 (2) ◽  
pp. 248-256 ◽  
Author(s):  
Lingyun Liang ◽  
Zhihuai Mao ◽  
Yebo Li ◽  
Caixia Wan ◽  
Tipeng Wang ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Ethylene Glycol ◽  
Wheat Straw ◽  
Corn Stover ◽  
Rice Straw ◽  
Crop Residues ◽  
Ethylene Carbonate ◽  
First Order Kinetics ◽  
Acid Catalyzed ◽  
Liquefaction Process

The liquefaction of crop residues in the presence of ethylene glycol, ethylene carbonate, or polyethylene glycol using sulfuric acid as a catalyst was studied. For all experiments, the liquefaction was conducted at 160 ° C and atmospheric pressure. The mass ratio of feedstock to liquefaction solvents used in all the experiments was 30:100. The results show that the acid catalyzed liquefaction process fit a pseudo-first-order kinetics model. Liquefaction yields of 80, 74, and 60% were obtained in 60 minutes of reaction when corn stover was liquefied with ethylene glycol, a mixture of polyethylene glycol and glycerol (9:1, w/w), and ethylene carbonate, respectively. When ethylene carbonate was used as solvent, the liquefaction yields of rice straw and wheat straw were 67% and 73%, respectively, which is lower than that of corn stover (80%). When a mixture of ethylene carbonate and ethylene glycol (8:2, w/w) was used as solvent, the liquefaction yields for corn stover, rice straw and wheat straw were 78, 68, and 70%, respectively.

Effect of organics on nitrogen transformations in soil under different moisture regimes

2008 ◽  
Vol 56 (3) ◽  
pp. 285-293
Author(s):  
M. Mavi ◽  
B. Singh ◽  
R. Setia
Keyword(s):  
Wheat Straw ◽  
Rice Straw ◽  
Crop Residues ◽  
Farmyard Manure ◽  
Poultry Manure ◽  
Field Capacity ◽  
Urea Hydrolysis ◽  
Green Manures ◽  
Untreated Soil ◽  
Organic Manures

Awareness of the environmental aspects of the quality of crop production has increased in recent decades, leading to renewed interest in organics such as crop residues, green manures and organic manures. The effect of organics on urea transformation was investigated by conducting a laboratory incubation experiment in alluvial clay loam soil (Typic Ustifluvents) at 33±1°C with two moisture levels (1:1 soil:water ratio and field capacity). The rate of urea hydrolysis decreased as the time of incubation increased and the disappearance of urea N was associated with a corresponding increase in the (NH 4+ + NO 3− )-N content in soils treated with crop residues (rice straw and wheat straw), organic manures (poultry manure and farmyard manure) and green manures (cowpea and sesbania). In untreated soil, the time taken for the complete hydrolysis of the applied urea (200 μg urea N g −1 soil) was more than 96 h at both the moisture levels, whereas in amended soils it was completed in 48 h. The rate of urea hydrolysis was more rapid at field capacity than at the 1:1 soil:water ratio. Urea hydrolysis was higher in sesbaniatreated soils, followed by cowpea, poultry manure, farmyard manure, rice straw and wheat straw at both the moisture levels. At field capacity, 85.5% urea was hydrolysed in sesbania-treated soil as compared to 32% in untreated soil after 24 hours of incubation, while at the 1:1 soil:water ratio the corresponding values were 81.5 and 27.5%. Urea hydrolysis followed first order reaction kinetics at both the moisture levels.

scholarly journals Fermentation Quality and Additives: A Case of Rice Straw Silage

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Yusuff Oladosu ◽  
Mohd Y. Rafii ◽  
Norhani Abdullah ◽  
Usman Magaji ◽  
Ghazali Hussin ◽  
...  
Keyword(s):  
Rice Straw ◽  
Nutritive Value ◽  
Crop Residues ◽  
Fundamental Principle ◽  
Water Soluble ◽  
Soluble Carbohydrates ◽  
Low Protein ◽  
Fermentation Quality ◽  
High Level

Rice cultivation generates large amount of crop residues of which only 20% are utilized for industrial and domestic purposes. In most developing countries especially southeast Asia, rice straw is used as part of feeding ingredients for the ruminants. However, due to its low protein content and high level of lignin and silica, there is limitation to its digestibility and nutritional value. To utilize this crop residue judiciously, there is a need for improvement of its nutritive value to promote its utilization through ensiling. Understanding the fundamental principle of ensiling is a prerequisite for successful silage product. Prominent factors influencing quality of silage product include water soluble carbohydrates, natural microbial population, and harvesting conditions of the forage. Additives are used to control the fermentation processes to enhance nutrient recovery and improve silage stability. This review emphasizes some practical aspects of silage processing and the use of additives for improvement of fermentation quality of rice straw.

Characteristics of Ion Concentration in the Atmospheric Particles in Harbin

2010 ◽  
Vol 113-116 ◽  
pp. 1439-1442
Author(s):  
Kun Wang ◽  
Hui Ling Duan ◽  
Li Kun Huang ◽  
Wen Shuai Wang
Keyword(s):  
Particulate Matter ◽  
Emission Spectroscopy ◽  
Inorganic Ions ◽  
Atomic Emission ◽  
Water Soluble ◽  
Atmospheric Particulate Matter ◽  
Ion Concentration ◽  
Plasma Atomic Emission ◽  
Atmospheric Particle ◽  
Water Soluble Inorganic Ions

We analyzed characteristics and concentrations of water-soluble inorganic ions based on fixed routine collection of atmospheric particulate matter (PM10, PM2.5) samples in Harbin during August 2008 and May 2009. The samplers we sampling is produced by Wuhan Tianhong Intelligent Instrument, we analyzed the water-soluble inorganic ions by using Ion Chromatographic (IC, DX120, Diana, USA) and Indicative Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES, Model 5300, Perkin Elmer, USA). The research showed that: SO42-, NO3-, NH4+ were the top three concentrated of the water-soluble inorganic ions ,the average concentrations were 10.3 μg/m3, 5.8 μg/m3, 8.2 μg/m3 respectively during sampling. Ca2+ was higher in the particulate > 2.5μm, while SO42- and NH4+ were higher in the particulate < 2.5μm, the correlation analysis inferred that the main form of SO42- in atmospheric particle was ammonium sulfate.

scholarly journals Seasonal Control of Water-Soluble Inorganic Ions in PM2.5 from Nanning, a Subtropical Monsoon Climate City in Southwestern China

Atmosphere ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 5 ◽  
Author(s):  
Wei Guo ◽  
Chenkui Long ◽  
Zhongyi Zhang ◽  
Nengjian Zheng ◽  
Huayun Xiao ◽  
...  
Keyword(s):  
Climate Change ◽  
Particulate Matter ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Southwestern China ◽  
Automobile Emissions ◽  
Monsoon Climate ◽  
Wet Season ◽  
Water Soluble Inorganic Ions ◽  
Subtropical Monsoon Climate

In this study, we measured the daily water-soluble inorganic ions (WSIIs) concentration (including SO42−, NO3−, NH4+, Ca2+, K+, Cl−, Na+, Mg2+, and F−) of PM2.5 (particulate matter with a diameter smaller than 2.5 μm) throughout the year in Nanning (a typical subtropical monsoon climate city in southwestern China) to explore the influence of seasonal climate change on the properties of PM2.5 pollution. This suggested that SO42−, NO3−, and NH4+ were the main component of WSIIs in Nanning. Secondary inorganic ions from fossil fuel combustion, agricultural activities, and automobile emissions were the main contributors to PM2.5, contributing more than 60% to PM2.5. Compared with the wet season, the contributions of different sources increased in the dry season (including pollution days); of these sources, automobile emissions and coal combustion emissions increased the most (about nine times and seven times, respectively). Seasonal weather and climate change affected the concentration level of WSIIs. During the wet season, higher temperatures and abundant rainfalls contributed to the volatilization and removal of WSIIs in PM2.5, while in the dry season and on pollution days, lower temperatures and less precipitation, higher emissions, and poor diffusion conditions contributed to the accumulation of WSIIs in PM2.5. NH4HSO4, (NH4)2SO4 and NH4NO3 were the main chemical forms of secondary inorganic ions. Sufficient NH3, intense solar radiation, and moist particulate matter surface promoted the formation of secondary inorganic ions. The higher temperature contributed to the volatilization of secondary inorganic ions.

Sign in / Sign up

Export Citation Format

Share Document