Hi Everybody!

The BIG QUESTION  

The plant  shall operate at rate of 14 hours per day working, which means capacity of water purification system shall be 15m3/hr. Keeping future scope for expansion, it is decided to set up 15m3/hr. water purification plant expandable to 20m3/hr.

The primary Source of water from the Dam lake and in case of emergency groundwater will also be used.
The result of water analysis report attached here for your reference.
Dam water sample test report:
Parameter                        Sample       Limit          Units
PHYSIO-CHEMICAL
Turbidity                            17.00         2.00          NTU
Silica                                 13.19        Not Spfd.    mg/lit as SiO2
Total Dissolved Solids          230.00       500           mg/lit
Total Suspended Solids        4.00          Not Spfd.    mg/lit
Iron                                   0.23          0.1            mg/lit as Fe
MICROBIOLOGICAL:
Viable Plate Counts-@ 37C   3300         <20           c.f.u./ml
Viable Plate Counts-@ 27C   4500         <100         c.f.u./ml
Coliform Bacteria                Present      Absent       /250 ml
E Coli                                 Present      Absent       /250 ml
Pseudomonas aeruginosa     Present      Absent       /250 ml
Faecal Streptococci              Present      Absent       /250 ml
Vibrio Cholerae                   Present      Absent       /250 ml
Sulphates Reducing Bacteria  Present    Absent        /250 ml
Yeast and Mould Count         Present      Absent       /250 ml

Remarks: Water Sample is Non Potable
Also, the Bore Well water was found Confirming to the reqmnts.

BASED ON YOUR EXPERIENCES WHAT WOULD BE THE BEST POSSIBLE PRE-TREATMENT AND THE CHEMICAL DOSING LEVEL???

The outlet water of clarifier shall be feed in Prefilters (ACF+PSF+Softner) +UF+RO+UV+Ozonation systems
(tentative scheme) and final product shall be used for package drinking water.


Thanks and regards,

What is wrong with using UV + Ozone for disinfection?

From what I've seen UV is effective at de-activating pathogens and most viruses (Adeno virus is resistant but can be treated with high-dose UV).

I've never heard of them "waking up" and UV is recognized all over the globe as a suitable disinfection technology.

Please note I work for UV Pure Technologies so I do have a bias opinion.

Opinions aside, I'd be very interested in reading any references you have to back up your statements.

Please also note that I'm not trying to discredit your response. Just, as an Engineer, I prefer to always check reference material.

Our UV techonlogy is advantaged and has won many awards but I pride myself on staying informed about technologies and their effectiveness and like to read findings (regardless of whether they are pro-UV or not).

Thanks in advance for the info!  

Let's try again - the documents/whitepapers are lengthy - some upwards of 64 to 165 pages. A simple "MRSA UV Resistence or Mycobacterium UV Resistance" search on Google and Indeed search engines will turn up a lot of papers. The CDC and WHO sites also have various papers on the increasing resistance to UV exposure by various microbial and fungal pathogens. Some of the food industry websites - especially juice (apple, pear, grape) have whitepapers available - primarily those in UK (for whatever reason) over the US.

Saltwater and freshwater aquaculture forums are also noting resistance and looking for alternatives - especially in Asian market due to focus on shrimp.

Appears from most of the whitepapers it's a time of exposure issue  - water flow needs to be reduced significantly or more lamps in series used. However, for fungal and some pathogens that are cyst/oospore producers the UV is virtually useless. Same for freshwater zebra mussel zeliger.

Thank you! I appreciate the information. I am aware that UV has limited effectiveness when dealing with surface waters. I am also well aware that conventional UV systems struggle greatly. If you care to look into our system (UV Pure Halletts and Upstreams) we've done a pretty good job of achieving very effective disinfection although we often use units in series or reduce flow to achieve higher contact times and can deliver a dose above 100 mJ/cm2.

I agree that UV is not the always the most robust of technologies (as it is generally effective as secondary or tertiary treatment but not as primary). That being said it is the best technology for niche areas (or at least in my experience).

I apologize for high-jacking the thread but I like to keep myself well informed and it'd be foolish not to ask questions with a competent source of information such as yourself.

Thanks again for the info!

@ Aquaticconsult...thanks for the explanation in detail.....and @ mark too .....healthy discussions like these help in updating one self and understand technologies better with an ultimate aim to achieve

Cheers

@ everyone. Thanks for the warm welcome. Water is the industry of life and our future. The more we have open discussions and dialogue the better we are all off in the long run. Thanks for welcoming me to the board as well. I think there is an excellent knowledge base here and it's a great learning opportunity for myself.

Thanks again everyone.