Controllable deep sand beds - a discussion thread

[Dr. Dendrostein]

Here's simple, if room permits. Increase hidth of dsb. Get orp reads, keep increasing bed little by little, test, till ideal hidth, found. This may take a year or more to determine, I think. Simple.

 

[Dr. Dendrostein]

One more. I'm going to use your picture, be back

The one I'm sketching, I would use

 

[Lasse]

In order to avoid confuse I must stress that I will only dose DOC into an apartment I want to be free of oxygen - not in the water column. I have stopp that.

However - my statement that detritus is not a problem is based on a normal loaded home aquaria. In heavy loaded fish farms system - it is necessary to remove detritus in the form of sludge now and then if the anaerobic filtration system should be of normal size.

Sincerely Lasse

 

[Dr. Dendrostein]

Hi,

After hijacking a couple of other thread it's time to start a thread instead

This is a thread for ideas for designing sand beds for nutrient control and other purposes, and ways to control them. Feel free to contribute with your ideas, thoughts and experiences!

So let's go! I'll have switch to my computer to find the sketch I did, so I'll be back with one idea for a controllable deep sand bed.

/ David

@Lasse @Jomama @Subsea @Scrubber_steve

Pump need to be controlled by orp controller. And ball valve, check valve on discharge possibly needed. Unless using dc pump then flow easy to control. Still need check valve, possibly. Forgot, see discharge. When pump activated, water in dsb rises, till it goes thru discharge.

I think we have a eureka moment. Pretty simple.

 

[Dr. Dendrostein]

Not bad for a dumb, Mexican/Jew. Heehee

 

[Lasse]

Here's what I personally hate of electronic design, when a surge happens, eventually effects electronics. Not everyone prepares to prevent them. When a black out/brown out happens, electronics possibly short out. And eventually do short out. Especially in Residential homes.

This was important for me when I design my system. If the system get zero in NO3 or got without circulation ( electrical grid breakdown) - my reversed DSB will convert to a hydrogen sulphide reactor. Hence placed in a certain apartment - hence refugium on the top, hence a large flow from the DT over it, hence a block of my return pump - at least 5 minutes delay after a power breakdown. This means that the skimmers has oxygenated the receiving chamber from the refugium before receiving any water that may content hydrogen sulphide.

Sincerely Lasse

 

[Lasse]

Not bad for a dumb, Mexican/Jew. Heehee

Why the pump from the sump to the DSB intake ? - the dosing pump is enough to get a flow through the sand bed. Using the principles of corresponding vessels.

Sincerely Lasse

 

[Dr. Dendrostein]

This was important for me when I design my system. If the system get zero in NO3 or got without circulation ( electrical grid breakdown) - my reversed DSB will convert to a hydrogen sulphide reactor. Hence placed in a certain apartment - hence refugium on the top, hence a large flow from the DT over it, hence a block of my return pump - at least 5 minutes delay after a power breakdown. This means that the skimmers has oxygenated the receiving chamber from the refugium before receiving any water that may content hydrogen sulphide.

Sincerely Lasse

If I had that system, I'd be testing every 3 months, make sure no issues. Very well planned.

 

[Dr. Dendrostein]

Why the pump from the sump to the DSB intake ? - the dosing pump is enough to get a flow through the sand bed. Using the principles of corresponding vessels.

Sincerely Lasse

The pump would increase water level in only dsb, so pushes out the discharge I drew to the right side

 

[Dr. Dendrostein]

I think pretty simple

 

[Lasse]

The pump would increase water level in only dsb, so pushes out the discharge I drew to the right side

Why do you need the discharge and where it goes?

Sincerely Lasse

 

[Dr. Dendrostein]

Why the pump from the sump to the DSB intake ? - the dosing pump is enough to get a flow through the sand bed. Using the principles of corresponding vessels.

Sincerely Lasse

Now that you mentioned dosing pump, no check valve. Water would flow thru pump so it recirculates

 

[Lasse]

The dosing pump will lower the level in the DSB, hence force the water to fill up from the plenum according to corresponding vessels. If you want more water pass through - rise the amount from the dosing pump or mount another pump working from the top of the DSB to the sump. Corresponding vessels is a powerful tool. The outlet from dosing pump (or other pumps) must be above the level of the sump

Sincerely Lasse

 

[Dr. Dendrostein]

Why do you need the discharge and where it goes?

Sincerely Lasse

I thought Sallstrom said this dsb sit in a sump?

 

[Dr. Dendrostein]

The dosing pump will lower the level in the DSB, hence force the water to fill up from the plenum according to corresponding vessels. If you want more water pass through - rise the amount from the dosing pump or mount another pump working from the top of the DSB to the sump. Corresponding vessels is a powerful tool.

Sincerely Lasse

Yea, top would work too. This is as simple it gets

 

[Dr. Dendrostein]

I see sump now. Then no discharge , pump on top.

 

[Dr. Dendrostein]

Pump need to be controlled by orp controller. And ball valve, check valve on discharge possibly needed. Unless using dc pump then flow easy to control. Still need check valve, possibly. Forgot, see discharge. When pump activated, water in dsb rises, till it goes thru discharge.

I think we have a eureka moment. Pretty simple.

On discharge of dosing pump. I would put a coil of tubing to start 25', increase length,see what orp reads are like. Coil of tubing to speed up anaerobic cycle.

 

[Lasse]

I thought Sallstrom said this dsb sit in a sump?

Yes and in a way that you - when everything is non function - the water level of the sump and water level of the DSB is in the same height. When the dosing pump (or another pump) take out water from the surface of the DSB - the water level goes down. Because the plenum is open to the sump - the principle of corresponding vessels will try to maintain the water level of the DSB to the same as the sump. It will create a flow through the DSB. David Chose a dosing pump because he want a slow flow. Whatever pump you use - it should be connected to the redox measurements

Sincerely Lasse

 

[Dr. Dendrostein]

Yes and in a way that you - when everything is non function - the water level of the sump and water level of the DSB is in the same height. When the dosing pump (or another pump) take out water from the surface of the DSB - the water level goes down. Because the plenum is open to the sump - the principle of corresponding vessels will try to maintain the water level of the DSB to the same as the sump. It will create a flow through the DSB. David Chose a dosing pump because he want a slow flow. Whatever pump you use - it should be connected to the redox measurements

Sincerely Lasse

That I see, and dsb is inside sump. Got it. Maestro

 

[Dr. Dendrostein]

The only thing different is trap. After all those ideas. My brain Hurts. Going to bed.