Wastewater Treatment Services
Wastewater Engineering Group's experience in water and wastewater treatment includes planning, evaluation, design, construction, inspection, operation and troubleshooting for the complete range of industrial and municipal wastewater treatment requirements. We are good at both conventional and advanced water and wastewater treatment processes.
Various technologies used in waste water treatment applications include:
Physical and Chemical Treatment
- Solids removal by bar screens & fine screens
- Sedimentation
- Clarification
- Oil and grease removal by grease separators, skimmers or dissolved air flotation (DAF)
- filtrations by sand, media or
- MF (micro-filtration) and UF (ultra-filtration) membrane filtrations
- centrifugation
- precipitation
- flocculation and coagulation
- ion exchange
Biological Wastewater Treatment
Biological treatment of waste water and (domestic) sewage water is used to degrade the organic load of soluted organic compounds. There are two main categories:
- aerobic treatment
- anaerobic treatment
If categorized in terms of the unit operations, biological wastewater treatment processes include:
- Conventional Activated sludge processes / Suspended system
- Fixed film biological processes (attached growth biofilm processes)
- Extended aeration systems
- SBR - Sequencing batch reactor systems for Wastewater
- MBR - Membrane bioreactors for Wastewater Treatment
- UASB - Upflow anaerobic sludge blanket digestion process
- Compact / package plants for onsite wastewater treatment
The table blow shows the major types of biological processes used in wastewater treatment plants
| Biological Process | Growth Configuration | Feeding Pattern | Redox Conditions | Remarks |
| Anaerobic digestion (AD) | Suspended growth | Continuous or Batch |
Anaerobic | |
| Anaerobic filter (AF) | Fixed film | Continuous | Anaerobic | |
| Activated sludge process (ASP) | Suspended growth | Continuous | Aerobic (Anoxic) (Anaerobic) | CAS |
| Biological aerated filters (BAF) | Fixed film | Continuous | Aerobic | |
| Rotating biological contactor (RBC) | Fixed film | Continuous | Aerobic | |
| Sequencing batch reactor (SBR) | Suspended growth | Batch | Aerobic (Anoxic) | |
| Trickling filter (TF) | Fixed film | Continuous | Aerobic | |
| Upflow anaerobic sludge blanket (UASB) | Suspended growth | Continuous | Anaerobic | |
| Membrane bioreactor (MBR) | Suspended growth | Continuous | Aerobic (Anoxic) | |
| Moving bed biofilm reactor (MBBR) | Suspended growth and Attached film growth | Batch | Aerobic (Anoxic) | derived from CAS |
Residual Treatment
- anaerobic sludge digesters
- sludge thickening treatment / stabilization
- filter press
- sand drying bed or other sludge drying
- dry sludge incineration
Effluent Polishing/ Further Treatment
- disinfection by chlorination, UV (ultra-violet) or ozonation
- activated carbon adsorption