Perry's Chemical Engineers' Handbook / AWWA Manual M46 / EPRI ZLD Systems Design Guide

Zero Liquid Discharge (ZLD) MVR, MEE & Crystallizer Sizing

Thermal evaporation mass/water balance, MVR power & MEE steam demand, Forced Circulation crystallizer & salt cake output

Zero Liquid Discharge (ZLD) MVR, MEE & Crystallizer Sizing Calculator Process & Field Engineering Reference
Engineering Process Reference: Zero Liquid Discharge (ZLD) MVR, MEE & Crystallizer Sizing Calculator governing plant layout conforming to Perry's Chemical Engineers' Handbook / AWWA Manual M46 / EPRI ZLD Systems Design Guide.

1. Engineering Principles & Mathematical Formulation

Comprehensive engineering design calculation model for Zero Liquid Discharge (ZLD) thermal evaporation systems. Computes mass and water balances for MVR (Mechanical Vapor Recompression) or MEE (Multi-Effect Evaporators) paired with Forced Circulation (FC) Crystallizers, total heat duty, electrical SEC/steam consumption, crystallizer volume, heat exchanger surface area, wet salt cake disposal rate, and scaling saturation checks for CaSO₄ and silica.

This calculation engine executes rigorous mass-balance and hydraulic equations. Every parameter is cross-checked to ensure zero rounding drift across bidirectional US Imperial and SI Metric unit systems.

2. Governing Standards & Authoritative Citations

"Design calculations for municipal and industrial water infrastructure must strictly adhere to recognized empirical standards to ensure hydraulic stability, structural integrity, and environmental compliance."
— Perry's Chemical Engineers' Handbook / AWWA Manual M46 / EPRI ZLD Systems Design Guide, American Water Works Association (AWWA) & U.S. Environmental Protection Agency (EPA Manual 832-B-99-002)

Primary benchmark citations include Crane Technical Paper No. 410, ASME Section VIII, and Metcalf & Eddy Wastewater Engineering.

3. Required Input Parameters & Variables

Symbol: Q_brine

Feed Brine Flow Rate

Default: 10 (GPM)
Symbol: TDS_in

Feed Brine TDS Concentration

Default: 50000 (ppm)
Symbol: TDS_evap

Evaporator Concentrated Brine TDS

Default: 260000 (ppm)
Symbol: Tech

Evaporator Technology

Default: 1 (type)
Symbol: SEC_mvr

MVR Specific Power Target

Default: 32 (kWh/kGal)
Symbol: N_effects

MEE Number of Effects

Default: 3 (effects)
Symbol: P_steam

MEE Steam Pressure

Default: 4 (psig)
Symbol: % Dryness

Centrifuge Salt Cake Dryness

Default: 90 (% solids)
Symbol: CaSO₄_in

Feed Calcium Sulfate (CaSO₄)

Default: 1200 (ppm)
Symbol: SiO₂_in

Feed Reactive Silica (SiO₂)

Default: 180 (ppm)

4. Professional Engineer (PE) Submittal Workflow

WaterCalcStudio Pro generates timestamped PDF calculation reports complete with formula proofs, intermediate variable breakdowns, and signature review blocks suitable for regulatory submittals.