A new gas‐around‐liquid spray nozzle (GLSN) was designed, and the two‐phase flow fluid field in this nozzle was simulated numerically. Flow characteristics under different structural parameters were obtained by changing the L/D ratio of the premixing chamber, incident angle, and inlet pressures. Increasing the L/D ratio and incident angle improved flow characteristics such as atomization flow, outlet velocity, and turbulence intensity. The nozzle performed optimally at an L/D ratio of 0.5 and incident angle of 60°. The atomization flow decreased with higher gas pressure and increased with higher liquid pressure. The outlet velocity mainly depended on the inlet gas pressure, not on the inlet liquid pressure. These results provide an indication for optimum structures and parameters of the GLSN.
Glyphosate, the most widely used herbicide in the world, is routinely applied to control weeds in both agricultural and urban settings. Glyphosate wastewater that has been treated with Fenton's reagent has a high phosphorus content and has the potential to cause environmental pollution. However, the high phosphorus concentration means that it may be possible to recover phosphorus from the glyphosate-rich wastewater. To date there have been relatively few studies on phosphorus removal from glyphosate wastewater. We therefore carried out a pilot scale study to investigate phosphorus recovery from this wastewater using chemical coagulation and evaluated the effect of various parameters, such as the initial pH, reaction time, coagulant dosage and type of coagulant. The experimental results demonstrate that a total phosphorus removal efficiency of about 68% was achieved for glycine wastewater and that total phosphorus removal efficiencies from N-(Phosphonomethyl) iminodiacetic acid wastewater and wastewater containing 6% glyphosate exceeded 90% under optimal reaction conditions.
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