Sewage management
Sewage treatment systems must continue to perform despite changing occupancy, flow and organic load.
Unisavour Industries Limited develops STP solutions around capacity, site conditions, treatment objectives and the intended use of treated water.
In short
A Sewage Treatment Plant (STP) treats domestic and similar wastewater from homes, offices, hotels, hospitals, campuses and the domestic side of industrial sites. Most STPs use biological treatment to break down organic matter, followed by separation of solids and, where required, filtration and disinfection. The process and degree of treatment depend on the plant's capacity, the site and whether treated water will be discharged or reused.
Unisavour Industries Limited develops STPs using biological processes such as MBBR, SBR, MBR, SAFF and extended aeration — selected for each site rather than applied as a standard design.
The challenge
Sewage is more consistent than industrial effluent, but the conditions around an STP are not.
Hotels, campuses and residential buildings see flows rise and fall through the day, week and season.
STPs are often fitted into basements, service areas or constrained corners of a site.
Many facilities need a plant that runs reliably with limited specialist supervision.
If treated water will be reused, the plant must be designed for that quality from the start.
Engineering approach
Capacity, site and treated-water use are fixed first; the process follows from them.
Occupancy, water use and expected variation define the design capacity.
Space, levels, existing structures and the surroundings shape the layout.
Compare biological processes on footprint, operation and treated-water objectives.
Add filtration and disinfection where treated water will be reused.
Commissioning, operator training and ongoing O&M.
Process pathway
Bar screens and grit removal protect downstream equipment.
A collection tank balances peaks in flow.
MBBR, SBR, MBR, SAFF or extended aeration.
Settling — or membranes, in an MBR.
Filtration and disinfection for discharge or reuse.
Technologies
A named technology is one part of a treatment train. Which of these suits a particular site is confirmed through water analysis, process design and the required outcome.
Wastewater Treatment
Biological treatment combined with membrane separation for applications that require a highly clarified treated-water stream.
Process family · Biological + membrane
Typical use · Advanced biological treatment, high treated-water quality or recycling
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Wastewater Treatment
Attached-growth biological treatment using carrier media that provide surface area for microorganisms while moving within the reactor.
Process family · Attached growth
Typical use · Sewage and industrial wastewater needing robust treatment and operational flexibility
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Wastewater Treatment
An aerobic attached-growth process in which biomass develops on submerged fixed media.
Process family · Attached growth
Typical use · Compact sewage and wastewater systems suited to a fixed-media process
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Wastewater Treatment
A biological process in which treatment stages occur sequentially within the same reactor through controlled operating cycles.
Process family · Activated sludge / batch
Typical use · Variable flows where batch-cycle operation offers process flexibility
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Wastewater Treatment
An activated-sludge process using extended aeration periods for stable biological treatment.
Process family · Activated sludge / batch
Typical use · Sewage treatment plants needing a relatively robust biological process
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Industries
Common questions
What buyers ask about sewage treatment plants.
Sewage first passes through screening and grit removal, which take out solids that could damage equipment, and an equalisation tank evens out the flow. In the biological stage, microorganisms break down organic matter — either suspended in the tank, as in SBR or extended aeration, or attached to media, as in MBBR or SAFF. Solids are then separated by settling or, in an MBR, by membranes. Filtration and disinfection follow where the treated-water quality requires them.
There is no single best STP technology. MBBR, SBR, MBR, SAFF and extended aeration each suit different combinations of capacity, footprint, load variation, operator availability and treated-water quality. The choice should follow a comparison against the site's actual requirements.
Compare biological processesCapacity is based on the expected sewage flow, which depends on the number of occupants or users, the type of facility and its water use. Peak flows and planned expansion should also be considered: an STP sized only for today's average flow may struggle at peak times or as occupancy grows.
Treated sewage can be considered for suitable non-potable uses such as toilet flushing, landscaping or cooling, provided it is treated to the quality the use requires and meets the requirements applicable to the project.
Wastewater recyclingIf an STP no longer meets its treated-water requirement, or occupancy has grown beyond its design, options can include process optimisation, adding media to existing biological tanks, adding tertiary stages or automation. An evaluation of the plant's actual performance should come first.
Plant audits & upgradesRelated solutions
Sewage management
Share the facility type, location, number of occupants or approximate flow, and how you intend to use the treated water. Our team can help define the next engineering step.Don't have complete technical data yet? Share what you know — our team can help identify what is needed for the next step.
