purpose: the aim of this study was to compare higher-order aberrations between personalized treatment (pt) versus personalized treatment advanced (pta) photorefractive keratectomy (prk) for myopia and myopic astigmatism. methods: in this clinical trial, 80 eyes of 40 patients who met inclusion criteria were enrolled. they underwent prk using pt or pta algorithm randomly. higher-order aberration...

The occurrence of trace organic contaminants in wastewaters, their behaviour during wastewater treatment and drinking water production are the key issues in relation to the reuse of water resources. Elimination of different classes of emerging contaminants, such as surfactant degradates, pharmaceuticals and polar pesticides in wastewater treatment plants (WWTP) was found to be rather low and co...

Nowadays, water pollution is one of the most dangerous environmental problems in world. The presence so-called emerging pollutants different bodies, impossible to eliminate through conventional biological and physical treatments used wastewater treatment plants due their persistent recalcitrant nature, means that continues growing throughout these involves serious risks human animal health for ...

Biological nitrogen removal (BNR) systems are increasingly used in the United States in both centralized wastewater treatment plants (WWTPs) and decentralized advanced onsite wastewater treatment systems (OWTS) to reduce N discharged in wastewater effluent. However, the potential for BNR systems to be sources of nitrous oxide (NO), a potent greenhouse gas, needs to be evaluated to assess their ...

The selection of an effective water treatment technology is the important issues that relatively dealing with pollution problems, some pollutants need more than conventional facilities to be treated and discharged within national standards. This study highlights advanced methods related chemical oxidation, which used in types such as heavy metals, pesticides, dyes, etc. demonstrate their effect...

The management of wastewater sludge, now often referred to as biosolids, accounts for a major portion of the cost of the wastewater treatment process and represents significant technical challenges. In many wastewater treatment facilities, the bottleneck of the sludge handling system is the dewatering operation. Advanced sludge treatment (AST) processes have been developed in order to improve s...