GORMAN-RUPP VG3B3-B, Инструкция по установке, эксплуатации и обслуживанию

Страница: 929 / 1180

Installation Operating and Maintenance Guidelines T-Rack vario 3(2012-05) E inge
Page 25
© 2011 inge GmbH ▪ All rights reserved
12. Rack design of inge UF modules:
All the modules must be operated under the same operating conditions. The basic
rack design shown in Appendix A applies to all types of inge UF modules.
13. Adding coagulants prior to ultrafiltration:
Depending on the dissolved organic carbon (DOC) concentration and its
characteristic structure in the feed water, it may be necessary to add inorganic
coagulants (FeCl
3
, polyaluminium chloride) to the feed system. Coagulants may
improve or stabilize membrane performance and can help to reduce the silt density
index (SDI), DOC and phosphate concentration in the filtrate
.
The required coagulant contact time depends on the coagulant and the water
chemistry as well as the water temperature. It is important to ensure adequate
mixing and contact time and proper distribution/mixing of the coagulant in the
feed water. Under no circumstances should the coagulation process take place
within the membrane or on the filtrate side.
If the coagulants described above are added upstream from the UF system, then
acid CEBs must be performed on a regular basis, at least prior to each CEB with
NaOCl.
Caution: The use of flocculation aids (e.g. polyelectrolytes) or flocculants
with organic components/functional groups may result in irreversible
membrane fouling.
Use of any such substances is not permitted unless they have been
tested and/or approved by inge in advance.
14. Ultrafiltration filtrate water quality
UF membranes cannot remove dissolved substances. This physical fact should be
taken into account for all parameters (SDI, turbidity, etc.) when measuring UF
filtrate water quality.
15. Regular leak tests
Regular general maintenance conducted on the UF plant should include checking
the tightness of all connection fittings on the UF system (flanges, valves, etc.) and
on the UF modules (couplings, Victaulic joints).
Fluid leakage – especially where corrosive mediums are involved – may cause
corrosion on adjacent surfaces, components and equipment. Effective
precautionary measures must be taken to prevent corrosion (see section 3.8).
In the event of fluid spill or leakage, the affected area should be properly rinsed
with salt-free or low-salt water and rubbed dry.
16. Process logic control system / programming
The automatic operation of the UF plant and the control philosophy must be based
on the latest version of the document “Process Specification UF 1(2012-05 ) E inge”
(Appendix B).