DuPont RO Technical Manual is a good start. However it is technical and requires close reading to develop a full understanding of the subject.
https://www.dupont.com/content/dam/dupont/amer/us/en/water-solutions/public/documents/en/RO-NF-FilmTec-Manual-45-D01504-en.pdf
Regards
Ashtree
"Any...
On a single membrane recovery is normally limited to about 15% to avoid concentration polarization. However if you recirculate a portion of the concentrate from that one membrane back to the feed of the membrane it is possible to achieve concentrations up to the solubility limit of the most...
Blurt
Its a matter of what is getting carried through to the effluent to be chlorinated. THMs are typically caused by the chlorination of organic matter. Most likely you have more BOD in the effluent than what you had when you were feeding glycerin. A TOC/DOC test of the effluent when using the...
Why is finished water pH important beyond the obvious. If you are worried about corrosion, high pH is not required if you have the appropriate hardness, alkalinity, TDS etc.
Higher pH is one way to get the LSI to an appropriate value but its also a balance with calcium and alkalinity.
What this...
Wright 44,
Do you have any details of the Limestone that you propose to use. Porosity, diameter, roundness?
With regards to the water do you know the permeate TDS and the dissolved inorganic carbon
As a general requirement you typically need to have an empty bed contact time of at least 20...
PamL
This is an excellent handbook which will help with some of the information you seek.
https://www.emerson.com/documents/automation/control-valve-handbook-en-3661206.pdf
Regards
Ashtree
"Any water can be made potable if you filter it through enough money"
It would also help to know how much daily, weekly or monthly variation in those water demand numbers. If there is considerable variation either side of the 100kl/day you may able to get away with 2 ROs smaller than 100kl/day with one running continuously using the capacity in the large storage...
Many pumps particularly if they have a fixed speed motor also offer stroke length adjustment which alters the volume of each stroke or pulse. This can be done manually or by a analogue controlled adjuster to give "automatic" or "remote" control. Stroke length adjustment works well but is not...
Little Inch is spot on. Unless there is a requirement for flexibility in operation in terms of flow then the overall savings are marginal. But because no one can select pumps properly anymore a VFD is typically installed because you can normally get the output you want at some speed. Maybe that...
Thanks EdStainless
UF membranes can tolerate reverse pressure during backwash so i would expect these to be okay.
Regards
Ashtree
"Any water can be made potable if you filter it through enough money"
I am setting up a pressure decay test (PDT) on a UF plant. In simple terms a PDT involves pressurizing with compressed the feed side of the membrane to about 5psi ,locking off the valves and looking at how quickly the pressure decays. This assumes that if a lumen is broken the pressure will leak...
RO membranes do not like being unpressurised on the feed side and having pressure on the permeate side of the membrane . Typically this is recommended to not exceed about 30kpa (4.5 psi approximately). Its not about water hammer or surge , but about protecting the membranes from back pressure...
I agree with TiCl4s comments and you should also check what happens if you lose air pressure.
Regards
Ashtree
"Any water can be made potable if you filter it through enough money"
Early in my career i worked for a Utility that had a whole lot of AC pipe breaks in one part of a city. The breaks were often complete burst where the top of the pipe would blow out. It was not my operational area so i never got directly involved but i can remember the guys involved saying it...
All the above answers are good advice but I am going to propose a slightly different approach because there are some gaps in your information.
First of all as someone has suggested above you need to start with the concentrate flow control valve and when the plant is running adjust it until the...
The pH change may be sufficient to impact on the other biological processes especially if the change is significant and rapid. Whether or not nitrification and subsequent denitrification is occurring will also impact on DO and aeration requirements.
Membranes may allow the production of clear...
There is another issue here which requires some focus.
Although you do not have a N or P limit and you say that you only have to meet a 30/30 requirement the 2ntu maximum turbidity potentially puts a fairly tough limit on your suspended solids. I am guessing that's why you are thinking about...
This is the type of situation that suits an SBR.
If these swings happen weekly than you would not change from one basin to two basin operation in that time.
If the variations are regular, lets say the low flow is always the weekend you would design a control system to deal with that. On those...
The starting point for the decision is that you need to get a comprehensive water analysis of the water that you are proposing to use. No matter who advises you and whoever is going to supply and install systems for you will require at least one but preferably a couple of comprehensive chemical...
