Mastering STPwiz: Your Ultimate STP Full Stop Search List Guide
STPwiz is the industry-standard software tool used by environmental engineers, water treatment professionals, and plant operators to design, simulate, and optimize Sewage Treatment Plants (STPs). Managing complex wastewater calculations requires rapid access to precise technical parameters.
The STP Full Stop Search List is a core shortcut architecture within STPwiz. It allows users to instantly pull up complete, unedited design criteria, reference values, and regulatory limits by typing a specific keyword followed by a full stop (period).
This guide provides the ultimate reference index for the STPwiz Full Stop Search List to accelerate your engineering workflow. 1. Influent & Flow Characterisation (.flow)
Accurate raw sewage characterisation prevents system overloading. Use these shortcuts to establish your baseline design flow and organic load parameters. avg. – Average Daily Flow (ADF) calculation matrix. peak. – Peak Factor charts based on population density.
bod. – Biochemical Oxygen Demand reference values by industry.
cod. – Chemical Oxygen Demand ratios for domestic vs. industrial influent. tss. – Total Suspended Solids default settling curves. tkn. – Total Kjeldahl Nitrogen loading coefficients. 2. Biological Treatment & Aeration (.bio)
Biological core design dictates the footprint of your aeration tanks. These commands instantly load kinetics, sludge ages, and oxygenation requirements.
mlss. – Mixed Liquor Suspended Solids optimal range calculator. srt. – Solids Retention Time limits for nitrification. f/m. – Food-to-Microorganism ratio boundaries. our. – Oxygen Uptake Rate empirical formulas. alpha. – Alpha and beta factors for diffuser fouling.
s倾向. – Sludge Volume Index (SVI) diagnostic thresholds. 3. Clarification & Settling (.settle)
Secondary clarifiers prevent biomass loss. Use these search codes to verify surface overflow rates and solid loading limits.
sor. – Surface Overflow Rate maximums under peak conditions.
slr. – Solids Loading Rate boundaries for circular clarifiers. wlr. – Weir Loading Rate standard specifications.
ras. – Return Activated Sludge flow rate optimization percentages. was. – Waste Activated Sludge mass balance calculators. 4. Advanced Nutrient Removal (.anr)
Meeting stringent discharge limits for nitrogen and phosphorus requires precise anaerobic, anoxic, and aerobic zoning.
bnden. – Biological Denitrification carbon source requirements.
ebpr. – Enhanced Biological Phosphorus Removal volatile fatty acid (VFA) ratios.
mld. – Mixed Liquor Recirculation ratios for MLE processes. alkn. – Alkalinity consumption and recovery equations. 5. Sludge Handling & Dewatering (.sludge)
Sludge management represents a significant portion of STP operating costs. Optimize your solids train with these processing commands.
thick. – Gravity and dissolved air flotation thickening yields.
dig. – Anaerobic vs. aerobic digestion volatile solids reduction rates. poly. – Polymer dosing ratios per dry ton of sludge.
cake. – Cake dryness percentages by equipment type (Filter Press vs. Centrifuge). Pro-Tips for STPwiz Power Users
Chain-Searching: You can combine commands for specific modules. For example, typing bio.mlss.ext bypasses standard domestic ranges to display Extended Aeration limits directly.
Custom Limits: Save your local regional regulatory guidelines (e.g., NGT limits, EPA standards) under the rego. prefix to override default system limits globally.
Exporting Lists: Type print.list. to generate a clean, project-ready PDF appendix of all design assumptions used in your current active simulation model. If you need to expand this manual, please let me know:
Should we include membrane bioreactor (MBR) specific shortcuts?
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