tailieunhanh - A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 2

Ứng dụng cho xử lý nước uống Chương này cung cấp giới thiệu đến các ứng dụng của bộ đếm hạt trong quá trình xử lý nước uống. Nó không phải là dự định như là một bản trình bày đầy đủ, nhưng đúng hơn là một điểm khởi đầu cho chặt chẽ hơn ở cách thức mà các quầy hạt có thể cung cấp dữ liệu có giá trị để tối ưu hóa quá trình. Nhiều quá trình điều trị khác nhau và chiến lược sẽ được tìm thấy trong ngành công nghiệp nước uống, và chất lượng nguồn nước. | CHAPTER 2 Applications for Drinking Water Treatment This chapter provides an introduction to the application of particle counters in the drinking water treatment process. It is not intended as an exhaustive presentation but rather as a starting point for looking more closely at the ways in which particle counters can provide valuable data for process optimization. Many different treatment processes and strategies are to be found in the drinking water industry and source water quality varies greatly from region to region. It is hoped that readers will use this information as a catalyst for looking more thoughtfully and imaginatively at the particular application with which they are involved. It should also provide a framework from which to understand better some of the recommendations made elsewhere in the book. A. WHY USE PARTICLE COUNTERS FOR DRINKING WATER TREATMENT A partial answer to this question has already been given in the preceding chapter. Particle counters are more sensitive to changes in particulate concentration than turbidimeters in many cases and thus offer additional information about process changes. The data presented below give some idea of the value of this sensitivity. Recent findings have indicated that treatment plants operated consistently with effluent turbidity levels below NTU will experience few problems with waterborne pathogens such as Cryptosporidium and Giardia. The problem is that turbidimeter accuracy falls off greatly below the NTU level. On the other hand particle counters are tailor-made for these low concentration waters. They provide a much greater operating margin at these demanding treatment levels. Particle counters detect particles in the size range of Cryptosporidium and Giardia which is probably the major reason they have been so readily accepted into the drinking water industry. There has been a lot of misunderstanding about the way in which particle counters are used to combat these pathogens which should be .