Wastewater

Sewage Treatment Plants (STP)Used water, ready for a second life.

We design, build and run sewage treatment plants that bring down BOD, COD and suspended solids, so treated water can go back to work for flushing, gardening and cooling.

Request a proposalHow it works
  1. 01Screening
  2. 02Equalisation
  3. 03Biological treatment
  4. 04Clarification
  5. 05Filtration
  6. 06Disinfection
  7. 07Sludge handling

What it is

In plain words.

Sewage is the used water from kitchens, bathrooms, toilets and cleaning across homes, offices, hotels and public buildings. A sewage treatment plant removes the organic load, solids and germs through a mix of physical, biological and chemical steps. What comes out is a clean liquid stream that is safe to discharge or reuse, and a smaller quantity of sludge that can be dried and handled separately.

Most buildings do not need fresh water for every job. Treated sewage can flush toilets, water gardens and top up cooling towers, which cuts the demand on borewells and municipal supply. We pick the process after looking at your inlet load, available space and the reuse standard you need, then design, supply, install, commission and, if you want, operate the plant for you.

How it works

Stage by stage.

  1. Screening

    Bar screens and grit removal take out rags, plastics and sand before they can damage pumps.

  2. Equalisation

    A holding tank evens out peak and lean flows so the biology downstream gets a steady feed.

  3. Biological treatment

    Bacteria, supplied with air from blowers, break down the organic matter that drives BOD and COD.

  4. Clarification

    Solids settle out or are held back by membranes, leaving clear water at the top.

  5. Filtration

    Pressure sand and carbon filters polish the water and remove remaining fine particles and colour.

  6. Disinfection

    Chlorine or another disinfectant is dosed so the treated water is safe to reuse.

  7. Sludge handling

    Excess sludge is thickened and dewatered, ready for disposal or use as manure.

Options

Built to suit the site.

  • Extended Aeration (EA)

    A simple, forgiving activated sludge process with long aeration time. Suits sites with steady flows and room to spare.

  • SAFF

    Submerged Aeration Fixed Film: bacteria grow on fixed media inside the aeration tank, which holds up well to load changes.

  • SBR

    Sequencing Batch Reactor: fill, aerate, settle and decant all happen in one tank, in timed cycles.

  • MBBR

    Moving Bed Biofilm Reactor: free-floating plastic carriers hold the bacteria, packing more treatment into a smaller tank.

  • MBR

    Membrane Bioreactor: membranes replace the settling tank, giving very clear water in about half the area.

Where it's used

Industries and sites.

  • Housing societies
  • Hotels
  • Hospitals
  • IT parks
  • Offices
  • Schools & campuses
  • Industrial townships

See how we work with each industry →

What we deliver

One team, from survey to service.

  • 01

    Design

    Survey, water or effluent analysis, process design and sizing for your site.

  • 02

    Build

    Supply, fabrication, civil and mechanical works, installation and commissioning.

  • 03

    Automate

    PLC, SCADA and remote monitoring, so the plant can be seen and controlled from anywhere.

  • 04

    Maintain

    Operation, preventive maintenance and AMC under Zeal-Care, with written reports.

Questions

Asked before every project.

Which STP process should we choose?

It depends on your daily flow, inlet quality, available space and the reuse standard you must meet. We recommend a process after a site survey and show you the trade-offs in cost, area and power.

Can the treated water be used for drinking?

No. Treated sewage is meant for non-potable uses such as flushing, gardening and cooling towers. Drinking water needs its own treatment line.

Can the plant go underground?

Yes, in many cases. Compact designs such as MBR can be installed below ground with landscaping on top, which helps on tight urban sites.

Wastewater

Often built together.

Tell us about your site.

Share your flow, location and timeline. An engineer will review your requirement and call you back within one working day.

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