Wastewater treatment operating principle

Hamilton Standard of the U.S. EPA has reported several coil coating plants wastewater treatment case histories.8,9 A full-scale wastewater treatment plant system has performed well for treatment of the wastewater generated from coil coating steel subcategory operations. The process principles and operational data of the full-scale treatment of a steel subcategory wastewater are summarized herein for the convenience of readers ... 

UV germicide mechanisms are introduced. Basic principles of UV disinfection system design, installation, and operation considerations are presented. The concern about UV disinfection by-products is also discussed. In addition, the mechanisms of UV oxidation are addressed. Its applications on organic pollutants decomposing as an emerging water and wastewater treatment technology are discussed. 

Study of transport processes of momentum, heat, and mass and selected unit operations. Only the elementary sections of Part 1 (the principles chapters—2, 3, 4, 5, 6, and 7) are covered, plus selected unit operations topics in Part 2 applicable to a particular field in a two-semester or three-quarter course. Those in wastewater treatment engineering, food process engineering, and process metallurgy could follow this plan. 

This chapter provides a state-of-the-art review of HFMST including a general review of hollow fiber membrane contactors, operating principles, design consideration, commercial availability of hollow fiber membrane, and module for scale-up and large-scale studies. Application of HFMST in pharmaceutical, biotechnological, gas absorption and stripping, wastewater treatment, and few latest studies of metal ion extraction are described in detail. 

The sensitivity to pH is another aspect not always considered. Homogeneous Fenton processes need to operate in a narrow pH range (2.5. 0) and this is a main process issue, as it requires the addition of large amounts of salts to the wastewater for pH control. The use of solid Fenton-type catalysts allows, in principle, operation at natural pH, without the need to adjust the pH, with better process economics. In addition, solid Fenton-type catalysts avoid the need for precipitation of iron and remove the iron sludges after treatment. This is a relevant process issue, especially when the operation is a pre-treatment before further stages such as biological treatments. 

---