On request, Hinada will provide guidance and general recommendations for:
- The selection and operation of the pretreatment processes
- The sizing of the MBR tank
The mechanical design of the membrane system
The selection and operation of the MBR System pretreatment processes
The complete pretreatment process design includes Pre-treatment and Biological design.
| Item | Pre-treatment /Biological design |
| Fibrous or Hairs or other sharp material that may clog the module or damage the membrane | Physical/chemical pretreatment (coarse bar screen, aerated grit and sand removal, fine screen, coagulation…) |
| Fat, oil and grease (FOG) | < 5 (at the inlet of biological treatment), Typical FOG levels found in domestic wastewater will not affect the membrane performance |
| PH adjustment | Better between 6—8, dosing system if needed |
| Temperature, BOD, COD, SS, TN, TP, TDS | In the case of typical municipal sewage treatment with proper MLSS concentration & operating at mild temperatures, approximately 6 to 8 hours of HRT under average flow conditions may be appropriate in order to avoid ammonia peaks during hydraulic peak flows. it can design anaerobic, anoxic and/or aerobic tank |
The sizing of the MBR tank
Separate tank for the MBR Modules will have good and convenience maintenance.
The mechanical design of the membrane system
| Equipment | Specification |
| Suction pump | l 2 sets one working one standby.
l suction head lift=6m. l rated head=15—25m. working pressure 0.15—-0.25MPa l Rated flow≥1.2 x deigned averaged flow. |
| Backwash pump | l rated head=10—15m. working pressure 0.1—0.15MPa
l Rated flow≥2 x deigned averaged flow. l it better to add the cartridge filter for backwash water, for big capacity project need design the Frequency converter. |
| Reflux pump | l rated head=10—15m.
l Rated flow≥2 x deigned averaged flow |
| Air Blower | l 1 working 1 standby.
l Continues fine bubble aeration. l Aeration Vibration volume between 0.15—0.2 Nm3 /m². Hour |
| Electrical valves | l One permeates valve, synchronous working with suction pump.
l One backwash valve, synchronous working with backwash pump |
