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16593 16 tủ tài liệu bách khoa

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

16593 16 tủ tài liệu bách khoa treatment plants typically produce some type of waste stream. The quality and characteristics of these waste streams are related to the main treatmen

t process. Furthermore, waste streams can impact the finished waler quality of the treatment process itself. Illis is especially true when the waste i 16593 16 tủ tài liệu bách khoa

s stored internal to the process or recycled.Despite the strong linkage between the treatment process and its waste streams, however, water treatment

16593 16 tủ tài liệu bách khoa

plant waste management has historically been treated as a stand-alone management issue. Whatever the treatment process produced was dealt with in a te

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

16593 16 tủ tài liệu bách khoaand characteristics as part of the overall evaluation and design of the main water treatment process. Water treatment processes produce unique waste s

treams, each of which has different associated waste handling costs. The waste streams must be viewed as part of the overall process to be optimized w 16593 16 tủ tài liệu bách khoa

hen determining the most economical method for meeting a specific set of finished waler quality goals. As an example, it is now recognized that storin

16593 16 tủ tài liệu bách khoa

g solids in a sedimentation basin is not desirable from a water quality perspective. Including solids storage considerations in the overall design of

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

16593 16 tủ tài liệu bách khoaations produce more spent filter backwash waste than do others. In determining the main treatment process components, waste streams should be consider

ed in the overall decision tree, not viewed as an issue that is handled separately.It is interesting to note the goals of waste treatment as described 16593 16 tủ tài liệu bách khoa

in the last edition of this book (1990)—"What must be removed? Where will it be disposed? What treatment is necessary to prepare it for disposal?'" R

16593 16 tủ tài liệu bách khoa

ecently, however, a new set of issues other than just disposal of the waste has become important. Instead of disposal, the first approach to end use i

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

16593 16 tủ tài liệu bách khoaes of waste oroduced is also increasinelv imoortant. Water oualitv16.2CHAPTER SIXTEENcling the water back to the treatment plant have become important

in planning a waste management system.The original term used to describe all water treatment plant wastes was sludge. In fact, sludge is really only 16593 16 tủ tài liệu bách khoa

the solid or liquid-solid component of some types of waste streams.The term residuals is now used to describe all water treatment plant process wastes

16593 16 tủ tài liệu bách khoa

, either liquid, solid, or gaseous.Hydrolyzing metal salts or synthetic organic polymers are added in the water treatment process to coagulate suspend

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

16593 16 tủ tài liệu bách khoa to the bottom of the settling basin where they become part of the waste stream. These residuals are referred to as alum, iron, or polymeric sludge (e

ven though they may be made up largely of water), being named after the primary coagulant used. These residuals account for approximately 70 percent o 16593 16 tủ tài liệu bách khoa

f the water plant solids generated. Similar solids, called lime sludge, are produced in treatment plants where water softening is practiced, and these

16593 16 tủ tài liệu bách khoa

lime or limc/soda ash plants account for an additional 25 percent of the industry's solids production. Il is therefore apparent that most of the wast

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

16593 16 tủ tài liệu bách khoates in that the liquid waste (water) contains suspended solids (and. as indicated above, are referred to as sludges). Other solid/liquid wastes produc

ed in the water industry include wastes from iron or manganese removal plants, spent G AC. spent precoat filter media, wastes from slow sand filter pl 16593 16 tủ tài liệu bách khoa

ants, and spent filler backwash waler (SFBW).The water industry also produces liquid-phase residuals, referred to as such because the liquid phase (wa

16593 16 tủ tài liệu bách khoa

ler) contains primarily dissolved solids which are within the liquid phase ilself. These wastes are oflen called brines or concentrules and include sp

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

16593 16 tủ tài liệu bách khoae containing suspended solids, they arc included in this category), reject water from electrodialysis plants, and spent regenerant from specific adsor

ption media such as activated alumina. Gas-phase residuals arc produced as off-gases from air stripping systems, and off-gas from ozone contactors. Th 16593 16 tủ tài liệu bách khoa

e major types of treatment plant residuals are shown in Table 16.1 .This chapter primarily addresses characterization, handling, and ultimate utilizat

16593 16 tủ tài liệu bách khoa

ion of sludges. Some introduction to the handling of liquid-phase residuals is included. More informalion on handling other residuals can be found in

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

16593 16 tủ tài liệu bách khoaOF SOUD/LIQUID RESIDUALS GENERATEDMost conventional coagulation plants produce two major residuals—residuals from the sedimentation basin (commonly re

ferred to as sludge) and residuals from back-washing a filter (referred to as spent filler backwash water).The quantity of these solid/liquid residual 16593 16 tủ tài liệu bách khoa

s generated from waler treatment plants depends upon the raw water quality, dosage of chemicals used, performance of the treatment process, method of

16593 16 tủ tài liệu bách khoa

sludge removal, efficiency of sedimentation, and backwash frequency.Ana tkii mnet rlitfiz'iilt taclzc fapinn tha ntilitw ùrtninùùr in nhnninn indWATER

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

16593 16 tủ tài liệu bách khoaoftening sludgesSpent filter backwash waterSpent G AC or discharge from carbon systemsSlow sand filter wastesWastes from iron and manganese removal pl

antsSpent precoat filter mediaSoftening pelletsLiquid-phase residualsIon-exchange regenerant brineWaste regenerant from activated aluminaMembrane conc 16593 16 tủ tài liệu bách khoa

entrateGAC transport water

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

______CHAPTER 16____WATER TREATMENT PLANT RESIDUALS MANAGEMENTDavid A. Cornwell, Ph.D., RE.PresidentEnvironmental Engineering & Technology, Inc.Waler

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