Complete wastewater services

Sewage & greywater treatment plants

Plan sewage or greywater treatment for a housing society, commercial property, or institution in Pakistan. Aquenvia reviews the incoming wastewater, present demand, future occupancy, and intended discharge or reuse before defining the plant.

Illustrative sewage treatment plant serving a housing development
Sewage treatment · Illustrative concept
01

Greywater or sewage?

Grey water treatment, also written greywater or gray water treatment, handles separately collected water from showers, washbasins, laundry, and similar sources, excluding toilet wastewater. If toilet waste enters the same sewer, the combined flow needs sewage treatment. Tell us which drains reach the proposed plant so we can assess the right system.

  • Greywater: separately collected washing and bathing water
  • STP: domestic sewage including toilet wastewater
  • Confirm kitchen and other connections during the survey
  • Treated sewage for reuse is reclaimed water
02

New developments & housing societies

Begin treatment planning alongside the sewer network and master plan. We review current and projected sewage flows, peak loading, land allocation, and the intended discharge point.

  • Site survey and flow assessment
  • Phased capacity planning
  • Modular, packaged, or conventional layouts
  • Site utilities and civil works scope
03

Grey water recycling & reuse

For housing societies and buildings in Lahore and across Pakistan, assess treated-water reuse for parks, landscaping, or toilet flushing where suitable. The treatment process, filtration, disinfection, storage, and distribution must meet the intended use. An existing combined sewer cannot supply greywater alone without separating the source plumbing.

  • Separate collection and cross-connection review
  • Treatment selected from flow and water-quality data
  • Reuse storage and dedicated non-potable pipework
  • Water-quality testing and operating requirements
04

A process matched to the site

Compare suitable biological treatment routes using the design flow, sewage characteristics, available footprint, and operating resources. The proposal defines the treatment target and design assumptions.

  • Screening and inlet works
  • Biological treatment and solids separation
  • Disinfection and reuse where suitable
  • Sludge handling and disposal planning
05

Installation through operation

Bring equipment, piping, electrical systems, controls, and civil works into one coordinated scope. Commissioning and support requirements are agreed before delivery.

  • Installation and startup
  • Performance testing against agreed criteria
  • Operator training and handover
  • Maintenance and operating support
06

Understand the complete STP process

Follow our step-by-step sewage treatment guide from screening and biological treatment through the sludge line. Estimate average, peak, wet-weather and phased flows with the wastewater flow guide before selecting plant capacity. Define the inlet works with the mechanical bar-screen selection guide, including peak hydraulics, debris, standby, screenings handling and safe access. Where downstream treatment needs a smaller opening, use the fine-screen selection guide to define aperture, clean and loaded hydraulics, wash water, carryover and MBR protection. For a compact basket option, use the rotary drum screen guide to define feed, active area, opening geometry, cleaning and reject handling. For a channel step screen, use the step-screen guide to define lamella opening, screenings-carpet behaviour, loaded hydraulics, grit, bottom cleaning and discharge height. Where a compact package must screen and lift solids with optional washing or compaction, use the screw-screen guide to define active area, brush contact, screw wear, discharge and controls. Define landscaping, toilet flushing, cooling or other duties with the water reuse planning guide before selecting polishing equipment. For attached-growth treatment, use the MBBR media selection guide to prepare fill, carrier, retention-screen, movement and startup inputs. Use the fine-bubble diffuser selection guide to define oxygen demand, airflow, grid pressure, commissioning and maintenance. For a membrane plant, use the MBR module selection guide to prepare flux, compatibility, cleaning and commissioning inputs. For a reuse proposal, use the UV disinfection selection guide to prepare flow data, water-quality results and quotation inputs.

SWS

Assess a static screen on representative wastewater

Use the static wedge-wire screen selection and operating guide to check effective area, peak loading, feed distribution, slots, blinding, cleaning, screenings handling, safe access and measured acceptance before selecting or replacing a passive screen.

SWC

Define screenings washing and compaction from measured feed

Use the screenings washer and compactor selection guide to check wet mass, loose volume, short-peak feed, washing and dewatering acceptance, drainage return, discharge, odour, controls and safe maintenance before selecting or modifying the handling train.

GRD

Confirm whether a grinder is the right blockage solution

Use the wastewater grinder and macerator selection guide to review protected equipment, representative solids, clean and loaded hydraulics, cutter duty, bypass, standby, controls, safe maintenance and measured acceptance before adding size reduction.

MBS

Check a manual bar screen as duty or standby

Use the manual bar-screen selection and operating guide to check clean and blocked hydraulics, measured screenings, cleaning response, safe raking access, isolation, standby and storage before installing or retaining a manually cleaned rack.

VGR

Define the complete vortex grit-removal train

Use the vortex grit-removal selection and operating guide to connect measured mineral load, particle duty and full flow range with chamber hydraulics, extraction, washing, civil works, controls, maintenance and measurable acceptance.

AGC

Check an aerated grit chamber as a complete process

Use the aerated grit-chamber selection and operating guide to connect flow range, retention, process air, blower pressure, grease duty, extraction, washing, civil works, controls and measurable acceptance.

GCW

Match grit classification and washing to the extraction cycles

Use the grit classifier and washer selection guide to connect measured mineral load and slurry peaks with washing acceptance, return-water duty, bin handling, controls, maintenance and quotation inputs.

HCF

Planning treatment for a hospital?

Use the hospital wastewater treatment service to map sewage and specialist liquid streams, establish flow and load, compare STP, ETP and source-pretreatment arrangements, and define disinfection, sludge, operating and quotation requirements.

07

Have land available for nature-based treatment?

Explore constructed wetlands in Pakistan to assess site suitability, pretreatment, land requirements, cost factors and maintenance. Compare the complete wetland system with mechanical treatment on the same wastewater and outlet-quality basis.

Discuss your project or request a site survey.

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