SBR (Sequencing Batch Reactor)
Time-cycled biological treatment in a single tank — flexible, robust, and forgiving.
The technology explained.
SBR (Sequencing Batch Reactor) is an activated-sludge process that runs all biological treatment stages in a single tank on a time-cycle: fill, react (aerated and anoxic), settle, decant, idle. Each cycle delivers a defined fraction of design treatment, and multiple SBR tanks operate in rotation to manage continuous influent flow.
- Removes 90–98% of BOD/COD on well-sized plants.
- Achieves deep nitrogen removal through engineered anoxic phases in the same tank.
- Achieves biological phosphorus removal (EBPR) on properly configured cycles.
- Tolerates variable flow and load without process upset.
- Single-tank architecture simplifies civil works and footprint.
- Sites with strong batch flow profiles (lodges with daily occupancy peaks).
- Sites requiring strict effluent BOD, N and P limits.
- Decentralised treatment plants where simplicity of architecture matters.
- Brownfield upgrades of older oxidation-ditch or trickling-filter plants.
- ×Continuous high-flow industrial duties — continuous-flow plants are more efficient.
- ×Operating complexity is real — cycle time control demands competent operators or a service contract.
- ×Decant quality is sensitive to settle-phase timing — sloppy operation produces sloppy effluent.
- ×Sludge wasting still requires a proper disposal route.
Where SBR is used.
- Lodge and estate secondary biological treatment
- Small-town municipal treatment
- Industrial batch-flow effluent
- Plants requiring strict N and P limits
How HidroVerse deploys SBR.
We specify SBR where the brief combines variable flow, strict effluent limits and a desire for single-tank architecture. Cycle design, decant strategy and sludge management are part of the engineered package.
A typical SBR treatment chain.
SBR is the biological core of a wastewater plant — the surrounding stages still matter.
Pre-treatment
Screening, grit removal, FOG arrestor, and equalisation buffer sized for the SBR cycle profile.
Core stage
Time-cycled SBR reactor with engineered fill / react / settle / decant / idle phases; DO and ORP feedback control; engineered anoxic phases for nitrogen removal.
Post-treatment
Decant via floating weir; tertiary filtration (sand or cloth); UV or chlorine disinfection; phosphorus polishing where required.
Waste handling
Periodic sludge wasting on cycle; dewatering and disposal under manifest; cycle log retained for regulator audit.
Other technologies worth knowing.
Buyer's guide.
The questions every commercial buyer should put on the table before signing for a water system. Can't see yours? Send us a brief — a HidroVerse specialist replies within one business day.
Yes — we keep a current reference list organised by application and scale. After a short qualifying call we release names, contacts and (with the host's permission) site-visit options. The conversation between two operations managers is the most honest reference we can offer; we do not gate-keep it.
We start with a SANAS-accredited feed-water panel, profile your demand against verified occupancy or production data (not brochure numbers), and specify against the worst-credible feed and peak demand — with disclosed margins. If a simpler technology will hit the brief, we'll specify the simpler technology and tell you why. We do not earn more by over-spending you; we earn more by you renewing service contracts year after year.
PFD, P&IDs, sizing calculations against verified influent data, equipment schedules with serial numbers, control philosophy, pre-treatment justification, waste-handling and regulatory compliance trail. Audit-ready by an external ECSA-registered engineer is the standard we design to — not a brochure pack with marketing fluff.
Pre-treatment is technology-specific (sediment, hardness, chlorine, biological load) and non-optional. Skipping it is the single largest cause of premature failure on every membrane, media bed and disinfection stage. Watch for suppliers quoting only the core stage — they are selling you a 12-month problem.
Every consumable and major component has a quantified replacement trigger (differential pressure, flow drop, UV intensity drop, salt-passage drift). Replacement schedules and trigger limits are written into the HidroVerse Care contract — visible, auditable and triggered on monitoring data, not guesswork.
Critical components are specified with duty/standby and automatic fail-over so a single failure does not stop supply. Our SLA on critical lines is 4 hours on site; the median lived response over the last 14 months is 2 hours 40 minutes. Telemetry triggers tickets before the operator notices — most failures are flagged, not phoned in.
Continuous telemetry on flow, pressure, conductivity, turbidity and on-skid water quality. Monthly SANAS-accredited compliance sampling is included on HidroVerse Care — not invoiced piecemeal. The audit pack builds itself monthly so when DWS or your insurer arrives, the file is ready in 30 minutes.
Potable applications: SANS 241:2015 (mandatory under the Water Services Act 108 of 1997), the National Water Act 36 of 1998 for abstraction and discharge, NSF/ANSI component certification, WHO Guidelines for design margin. Wastewater: the relevant DWS discharge authorisation under General Authorisation 665 or a site-specific Water Use Licence. We sign off against the legal floor and design to a margin above it.
Survey 1–2 weeks, design 2–4 weeks, install 4–10 weeks, commissioning and proof of compliance 1–2 weeks — typically 8–14 weeks for a lodge or estate, longer for mining and municipal. Delays come from civil works, third-party council approvals and architectural changes; the engineered scope rarely slips.
Survey, lab analysis, design pack, equipment, install, commissioning, operator training, the first year of monthly compliance sampling and the agreed scope of HidroVerse Care. Civils, electrical reticulation, third-party council fees and any architectural integration work are quoted separately and scheduled into the contract. If your quote has 'allowances' and 'provisional sums' across the page, you are buying a future invoice.