I have the LaGrega text, so I compared both texts side-by-side. Overall, I think the LaGrega text will be much more helpful because of all the additional regulatory information - it provides a nice background for regulatory processes and engineering decision-making within the regulatory framework. The Env Engineering Calcs book focuses solely on engineering design and goes into excruciating details in Part 2 of the books that covers Solid Waste in terms of:
2.1 Thermodynamics in Environmental Engineering (basic mass, volume, molar relationships)
2.2 Basic Combustion and Incineration (principles, mass balances, evaluation of permit application data)
2.3 Practical Design of Waste Incineration (combustion process calcs, waste combustion systems, emission factors, conversions and corrections)
2.4 Calculations for Permitting and Compliance (EPA Methodologies, Regulatory Emissions Standards/Compliance, Impact of Emissions & Risk Assessment)
2.5 Calculation Procedures for Ash Stabilization (Overview of Processing/Stabilizing Flyash, Calculations for Stabilizing Fly Ash, Material Data Safety Sheets for specific process waste ash such as bottom ash or medical waste, Catalytic Extraction Processing)
2.6 Incineration Technologies and Facility Requirements (Technologies, Resource Recovery System, Facility Design Features)
3.1 Air Emission Control (Air pollution definitions, pollution emissions calculations, Gaseous emissions control techniques, management of incineration residues, accessory equipment for air pollution control, monitoring equipment, record keeping)
3.2 Particulate Emission Control (Basic particulate emission control, factors affection selection of particulate control equipment, particulate control equipment, particulate concentration calculations, particulate emissions control costs)
3.3 Wet and Dry Scrubbers for Emission Control (Wet adsorption for particulate emission control, wet absorption for gaseous emission control, wet scrubbers for particulate and gaseous emission control, dry absorption for gaseous emission control, accessory equipment for scrubber)
Let me know if you have any specific questions regarding either the LaGrega text or Env Engineering Calculations. I don't have the EnvERM, so I can't comment directly on that text.
JR