Nitrogen release from aerobically composted hop bines

A computational fluid dynamics (CFD) model of a 600 MW opposed swirling coal-fired utility boiler has been established. The chemical percolation devolatilization (CPD) model, instead of an empirical method, has been adapted to predict the nitrogen release during the devolatilization. The current CFD model has been validated by comparing the simulated results with the experimental data obtained from the boiler for case study. The validated CFD model is then applied to study the effects of ratio of over fire air (OFA) on the combustion and nitrogen oxides (NOx) emission characteristics. It is found that, with increasing the ratio of OFA, the carbon content in fly ash increases linearly, and the NOx emission reduces largely. The OFA ratio of 30% is optimal for both high burnout of pulverized coal and low NOx emission. The present study provides helpful information for understanding and optimizing the combustion of the studied boiler

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Four kinds of capping materials for controlling phosphorus and nitrogen release from contaminated sediment using a static simulation experiment

Frontiers of Environmental Science & Engineering ◽

10.1007/s11783-021-1463-x ◽

2021 ◽

Vol 16 (3) ◽

Author(s):

Zhenming Zhou ◽

Canyang Lin ◽

Shuwen Li ◽

Shupo Liu ◽

Fei Li ◽

...

Keyword(s):

Simulation Experiment ◽

Contaminated Sediment ◽

Nitrogen Release ◽

Static Simulation

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Preparation and properties of hydrogel based on sawdust cellulose for environmentally friendly slow release fertilizers

Green Processing and Synthesis ◽

10.1515/gps-2020-0015 ◽

2020 ◽

Vol 9 (1) ◽

pp. 139-152 ◽

Cited By ~ 2

Author(s):

Xiao Zhang ◽

Yanlu Liu ◽

Panfang Lu ◽

Min Zhang

Keyword(s):

Slow Release ◽

Environmentally Friendly ◽

Water Absorbency ◽

The Novel ◽

Structure And Properties ◽

Nitrogen Release ◽

Release Property ◽

Slow Release Fertilizers ◽

Grafting Copolymerization ◽

Cross Linker

AbstractA novel hydrogel slow-release nitrogen fertilizer based on sawdust with water absorbency was prepared using grafting copolymerization. Urea was incorporated as nitrogen source in a hydrogel fertilizer. Potassium persulfate (KPS) and N,N᾽-methylenebis acrylamide (MBA) were used as the initiator and cross-linker, respectively. The structure and properties of the samples were characterized by XPS, EDS, SEM, XRD and FTIR. The effects of various salt solutions, ionic strength and pH on swelling behavior were discussed. The results showed that the largest water absorbency of the sample reached 210 g/g in distilled water. In addition, the sample had the good nitrogen release property. Thus, the novel environmentally friendly hydrogel fertilizer may be widely applied to agricultural and horticultural fields.

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