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entering information about the community of documents,technical reports,manufacturers,and
<br /> interest,and assembling a collection of treatment practical experience as developed or reported
<br /> ' trains containing a wide assortment of treatment by private and public agencies.In addition to the
<br /> processes.WAWTTAR comes with a collection technical data described above,sufficient reference
<br /> of U.S.and international potable and wastewater material(text,photos,line drawings)is provided
<br /> discharge and reuse standards.Each standard can for each process so that WAWTTAR can serve as
<br /> specify a minimum and maximum concentration for an educational tool for engineers and community
<br /> any of nearly 100 water quality constituents.New or planners.
<br /> ' modified standards can be entered by the user if no Once the user has defined the community of
<br /> existing standard in the WARrITAR list is appropriate interest and selected a reuse objective(if any)and
<br /> for the problem under consideration. a discharge standard,WAWTTAR will perform a
<br /> An editing tool is used to describe the screening process to identify feasible treatments as
<br /> characteristics of the community under those that satisfy the community;technological,and
<br /> consideration. These include water demand, regulatory constraints for the problem.Infeasible
<br /> wastewater characteristics, resource cost and treatment trains are identified,along with the reason
<br /> availability,the presence or absence of institutional that they were classified as infeasible.Estimated
<br /> support,financial and population characteristics, capital and operating costs over,the project planning
<br /> and various community cultural factors that might period are computed for all feasible trains,along with
<br /> affect the choice of an appropriate wastewater subjective measures of adaptability of the train to
<br /> treatment technology. varying hydraulic and mass loadings,and the ease
<br /> Resources in this case include the type and of future upgrades.
<br /> reliability of the power supply,manpower(from '..
<br /> simple unskilled labor to technical and professional What Does WAWTTAR Give Me?
<br /> personnel),the availability of treatment chemicals, The output from WAWTTAR is broken into two
<br /> and any other type of human or physical capital that text files:the Feasible Solution File and the Infeasible '..
<br /> might be necessary. _ Solution File.
<br /> The user creates an array of treatment trains The Feasible Solution File contains information
<br /> that WAWTTAR will compare against one another detailing the cost and performance of feasible
<br /> and against the community profile and discharge treatment trains.This file contains the general
<br /> requirements. The treatmenttrains represent design criteria for the problem,followed by a
<br /> logical assemblies of processes to treat water or detailed accounting of capital cost,O&M cost,
<br /> wastewater.While a number of treatment trains land requirements,and land cost for each process
<br /> are preassembled,an editing tool makes it easy for in each feasible train.The total cost for the train,
<br /> users to construct new trains or modify existing total per capita cost,and total cost per dwelling for
<br /> trains that might be worthy of consideration for the each treatment train also are supplied.All costs are
<br /> problem under study.The train editing tool guides reported based on a user-specified choice of annual
<br /> the user through the process of selecting from a or total project costs.
<br /> list of preliminary,primary,secondary,tertiary,and WAWTTAR also provides an adaptability index, '....
<br /> solids treatment processes.While more than 200 which ranges from zero to 3,and rates how easily
<br /> treatment processes are available in the WAWTTAR each train can be upgraded and handle variations
<br /> database,users can enter a new process or edit an in hydraulic loading and influent quality,
<br /> existing one. Final effluent quality for each of up to 10 user-
<br /> WAWTTAR uses a curve fit of land requirements, specified water quality constituents,along with
<br /> construction costs,and operation and maintenance potential social and environmental impacts, is
<br /> (O&M)costs,and performance versus process reported for each train.WAWTTAR also presents the
<br /> loading(hydraulic,organic,of solids)to perform trains!it a table that is ranked by multiple parameters,
<br /> calculations.Cost breakdowns are used to localize Users can specify rank criteria of minimum capital
<br /> construction and O&M costs for a particular com- cost,minimum O&A4 cost,or minimum total project
<br /> munity.The construction cost for each process is cost,
<br /> divided into categories of labor,earthwork,manu- The Infeasible Solution File contains the details on
<br /> factored equipment,structures,concrete,steel,and any treatment train that fails the screening criteria
<br /> pipes,valves,and instruments.O&M cost categories established by the user,as well as information on '....
<br /> are labor,chemicals,materials,and energy and land which screening criteria were not met,Frequently, '....
<br /> r requirements, review of why a train was classified as infeasible
<br /> Information on treatment processes can come yields important insights into the current problem
<br /> from U.S. Environmental Protection Agency and design process.Therefore,users are encouraged
<br /> n CTOaER 2004
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