Hydromantis, Inc. Capdet Works Training

StateState--ofof--Art Software for the Design and Preliminary Art Software for the Design and Preliminary Costing of Wastewater Treatment SystemsCosting of Wastewater Treatment Systems

Hydromantis, Inc. Capdet Works Training

CapdetWorks

● ‘Preliminary Design and Costing Tool’ for evaluating WWTP alternatives

● Based on the U.S. EPA CAPDET program.● Hydromantis moved CAPDET to the PC in 1985.● Approximately 200 copies sold to universities,

governments and consultants

Hydromantis, Inc. Capdet Works Training

What Does It Do?

● Designs individual unit processes based on a user specified treatment plant layout

● Costs each unit process● Overriding Capability gives the user

the ability to fine-tune the design and/or costing

Hydromantis, Inc. Capdet Works Training

How does it design ?● EPA Design Algorithms (Originally)● Major changes made in version 2.1 :

Design algorithms based more on influent fractionation (M&E)

Hydromantis, Inc. Capdet Works Training

Design level ● Planning Level Design

± 15 % Capital Cost± 20 % Operation and Maintenance Costs

● To screen various alternatives

Hydromantis, Inc. Capdet Works Training

Costing approach● Unit Costing approach

easier to update costs of each elementeffect of inflation

● Categories of costs:unit process costsindirect project costsdirect project costs

Hydromantis, Inc. Capdet Works Training

LAYOUT SPECIFICATION AND TREATMENT OBJECTIVES

PROCESS DESIGN CALCULATION (ex: tankage, air requirements…)

IDENTIFICATION OF THE MAJOR COSTS (Structural, equipment, O&M)

STRUCTURE SPECIFIED EQUIPMENT POWER REQ. OPERATIONAL(MAN HOUR )

CHEMICAL REQ.

Concrete, Earth, Pipe Works + other

Escalated equipment cost,Cost of installation

ANNUAL O&M COST

Unit Costs

Cost of tank/structure Installed Equipment Cost

CAPITAL COST OF UNIT PROCESS

Maintenance Cost Model Annual Power/Man Power/Chemical Costs

GENERAL AVERAGE COSTS

Hydromantis, Inc. Capdet Works Training

NET PRESENT WORTH● Total NPW = ● Unit Process Construction Cost + ● + Unit Replacement NPW ● + O&M NPW ● – SV NPW ● – Rev. PW

Hydromantis, Inc. Capdet Works Training

PROJECT COST● Total of Unit Process Costs● + Other direct costs :

yard pipinginstrumentationadministrative facilities

● +Land costs

Hydromantis, Inc. Capdet Works Training

PROJECT COST● + Indirect Costs

Engineering FeesAdministrative feesInterest Rate during construction

Hydromantis, Inc. Capdet Works Training

Examples of Applications● Screening of design alternatives based

on cost● Cost to upgrade processes to meet

more stringent effluent criteria

Hydromantis, Inc. Capdet Works Training

BIOLOGICAL REACTOR DESIGN PRINCIPLES IN

CAPDET WORKS

Hydromantis, Inc. Capdet Works Training

Aspects covered● Influent Characterization● Solids mass calculation● Air requirements ● Nutrient requirements● Sludge production

Hydromantis, Inc. Capdet Works Training

Design Principles in CDW: Biological Reactor

● Calculation or Specification of the SRT● Minimum SRT: > 1/(µ - kd)

at the lowest temperaturefor heterotrophs for C removal only

For nitrifiers if nitrification required+ Apply Safety Factor

Hydromantis, Inc. Capdet Works Training

Influent Characterization

● Influent Speciation:VSSin = TSSin * (VSS/TSS)in

ISSin = TSSin – VSSin

Hydromantis, Inc. Capdet Works Training

Influent Characterization

● Biodegradable vs Unbiodegradable Matter

uVSS = F*VSSin (F: unbiod. Fraction)uCODin = 1.5*uVSSin

uSSin = ISSin + uVSSin

bCODin = CODin – uCODin

Hydromantis, Inc. Capdet Works Training

Solids Mass Calculation● Mass of Active Biomass:

M(Xa) = SRTaer*Qin*Yh*BODremoved

(1 + kd,T * SRTaer)● Mass of Endogenous Biomass:

M(Xe) = 0.2*kd*SRTaer*M(Xa)

● Mass of Inert VSS :M(XI) = uVSSin*Qin*SRTaer

Hydromantis, Inc. Capdet Works Training

Solids Mass Calculation● Volatile suspended solids :M(VSS) = M(Xa) + M(Xe) + M(XI)● Inert suspended solids:M(ISS) = ISSin*SRTaer*Qin

● Total mass of solids:M(TSS) = M(VSS) + M(ISS)

Hydromantis, Inc. Capdet Works Training

Reactor Sizing● Reactor volume = Mass of solids

(Solids Conc.)● + Number of batteries, process trains

and tanks in series as a function of flow rate

Hydromantis, Inc. Capdet Works Training

Air requirements● For C Removal only:O2 req. = Qin*(BODremoved)/1000● For C and N removal:O2req = Qin*(BODremoved) + 4.57*Nn

1000

Hydromantis, Inc. Capdet Works Training

Air requirementsOTE = STE*(DOsat – 2)*alpha*1.024(Tw – 20)

9.17Qair = O2 required

(OTE/100)*(1.2*0.21)

Hydromantis, Inc. Capdet Works Training

Nutrient requirements for growth

● Nitrogen: 0.05*BODremoved

● Phosphorus:0.01*BODremoved

Hydromantis, Inc. Capdet Works Training

Sludge Production Calculation

● Sludge total = Vtotal*SSreactor

SRTaer*1000

Hydromantis, Inc. Capdet Works Training

Tutorial 1 – Learn how to…● Build, design and cost a simple layout● See the effect of more stringent

effluent requirements ● Examine the details of design and

costing

Hydromantis, Inc. Capdet Works Training

Tutorial 2 – Learn to…● Customize costing parameters

Units costs, Financial costsCosting IndicesCreate an equipment database

Hydromantis, Inc. Capdet Works Training

Tutorial 3 – Learn to…● Override the physical design● Override the unit process equipment

costs● Override the design safety● Override the blower system

Hydromantis, Inc. Capdet Works Training

Tutorial 4 – Learn to…● Perform a sensitivity analysis:

Plant-wide Process unit

Hydromantis, Inc. Capdet Works Training

Tutorial 5 – Comparing Alternative Designs

● Duplicating a layout● Comparing the costs of different

treatment alternatives● Generating a report