{"product_id":"unitworks-wwtp-design-tools","title":"UnitWorks: WWTP Unit Process Design Tools (Excel + Web + Manual)","description":"\u003cp\u003e\u003cstrong\u003eSize a whole wastewater treatment plant in an afternoon, and show every step of the working.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUnitWorks is a set of process design tools for engineers who design, check or upgrade treatment plants. Size each unit on its own, or link them into a complete plant. Inlet works, BNR, MBR, clarifiers, disinfection, digestion and dewatering are all included, with the return liquors closed back to the inlet. Every result is checked against typical design criteria. When a check fails, it tells you what to change.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWatch the 70-second demo above\u003c\/strong\u003e to see the web tool and Plant designer in action.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the download\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign workbook (Excel):\u003c\/strong\u003e 34 unit-process modules, one sheet each, from design flows to sludge dewatering. Yellow cells are inputs, and every formula is visible and protected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinked plant workbook (Excel):\u003c\/strong\u003e a complete 20 ML\/d BNR plant built from the modules and linked by formulas, with a live flowsheet and the return liquors resolved by iteration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb tool with Plant designer:\u003c\/strong\u003e all 34 modules in your browser, plus a designer that links them into a plant. It works offline, with nothing to install.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e85-page user manual (PDF):\u003c\/strong\u003e step-by-step use of both Excel workbooks and the web tool; for every module, the method, inputs, results and checks, with a worked example. It also has design criteria tables and a fully worked 20 ML\/d plant.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Plant designer\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eChoose the train: MLE, A2O bio-P, nitrification only, oxidation ditch, MBR or SBR, with or without primary settling, chemical P trim, UV or chlorination, and the sludge line.\u003c\/li\u003e\n\u003cli\u003eEnter population, per-person loads, temperatures and effluent targets. Every unit is sized from the one upstream.\u003c\/li\u003e\n\u003cli\u003eYou get a drawn flowsheet with every tank shown, effluent quality against your targets, the water and nitrogen balances, and every design check in one place.\u003c\/li\u003e\n\u003cli\u003eClick any unit to open its full linked calculation and fine-tune it.\u003c\/li\u003e\n\u003cli\u003eFour example plants are ready to explore: a 20 ML\/d MLE, a 20 ML\/d A2O, a 4.5 ML\/d oxidation ditch and a 10 ML\/d MBR.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e34 design modules\u003c\/h3\u003e\n\u003cp\u003eDesign flows and loads; bar and fine screens; aerated and horizontal-flow grit; primary clarifiers; lamella settlers; activated sludge for BOD removal and nitrification; MLE denitrification; biological P removal; oxidation ditch; SBR; MBR with feed and permeate pumps and scour air; secondary clarifiers with state point analysis; RAS and WAS pumping; aeration and blowers; tertiary denitrification with methanol; trickling filters; MBBR for BOD, nitrification and denitrification; facultative ponds and aerated lagoons; chemical P removal; metal hydroxide precipitation; DAF; chlorination; UV; plant solids mass balance; gravity and mechanical thickening; anaerobic and aerobic digestion; centrifuge and belt press dewatering; UASB; septic tank and soil absorption.\u003c\/p\u003e\n\n\u003ch3\u003eWhy engineers like it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo black boxes:\u003c\/strong\u003e every step is shown with its symbol, unit and typical range, so you can follow it, check it and put it in a report.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in design checks:\u003c\/strong\u003e results are flagged OK, CHECK, HIGH or LOW against typical criteria, and each flag comes with a short note on what to change.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSchematics for every unit,\u003c\/strong\u003e labelled with your live results, including a plan view of every tank.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTested:\u003c\/strong\u003e every module has worked examples, and the Excel and web versions give identical results.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast to use:\u003c\/strong\u003e invalid inputs are highlighted, a glossary explains every term, and one click copies the results for your report.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDetails\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSI units. No macros or add-ins.\u003c\/li\u003e\n\u003cli\u003eExcel workbooks: Microsoft 365, Excel 2019 or later, and Excel for Mac. The plant workbook uses Excel's iterative calculation.\u003c\/li\u003e\n\u003cli\u003eWeb tool: any modern browser, works offline.\u003c\/li\u003e\n\u003cli\u003eInstant download after purchase, delivered as one zip file.\u003c\/li\u003e\n\u003cli\u003eSupport: \u003ca href=\"mailto:hello@wwtpplus.com\"\u003ehello@wwtpplus.com\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eUnitWorks is a design aid. Results depend on the inputs and coefficients you choose. Check every design against your local regulations, standards and supplier data, and have it reviewed by a qualified engineer. Licensed to the purchaser for their own projects, including client projects. Not for resale or redistribution. © 2026 WWTP Plus.\u003c\/em\u003e\u003c\/p\u003e","brand":"WWTP Plus","offers":[{"title":"Default Title","offer_id":67853602128147,"sku":"UW-1.0-SI","price":149.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1014\/4976\/1043\/files\/unitworks_hero.jpg?v=1793105187","url":"https:\/\/wwtpplus.com\/products\/unitworks-wwtp-design-tools","provider":"WWTP Plus","version":"1.0","type":"link"}