Which vents for my septic tank?

[Mooruk]

We have a 50 year old brick-built septic tank. Having uncovered the top of it from many years of earth and roots, we found the tank to have a hole (120mm diameter) for a long gone vent pipe and at the opposite end a vent pipe that is crumbling away. The question is what is the best thing to use for venting? I've seen this https://www.amazon.co.uk/dp/B00FQEX1ZG/ref=cm_sw_r_cp_apa_i_PIujFbFC28WP4

(Studor Maxi-Filtra Two Way Vent for Septic Tank) can I use this for both holes or sold I use on of  plus an Air Admittance Valve on the other? Can send pics if necessary.

 

Thanks in advance

 

Edited August 1, 2020 by Mooruk
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[Russell griffiths]

Is it close enough that smells will be annoying, if not they normally just vent to the atmosphere via a 110mm pipe with a bird proof cone on top. 

[Nickfromwales]

Is there a vent to atmosphere on the house? If so that should be suffice. 
You can vent low level from the tank at the boundary too, if it won’t be a nuisance to neighbours. Or, at a garage / outbuilding. 
Put a paving slab over the one at the tank and redo the one travelling away?  

[Mooruk]

2 hours ago, Russell griffiths said:

Is it close enough that smells will be annoying, if not they normally just vent to the atmosphere via a 110mm pipe with a bird proof cone on top. 

Our garden isn't massive, so ideally we don't want to smell it at all.

 

[Mooruk]

Thanks for the advice, here's a pic of it to help.

[joe90]

+1 wot @Nickfromwales said above, my treatment plant is only vented to atmosphere away from the plant on the side of my garage past the house.

[Onoff]

Similar to ours I guess. Inspection manhole in the foreground then the lid of the tank:

 

 

 

 

[Nickfromwales]

5 hours ago, Mooruk said:

Thanks for the advice, here's a pic of it to help.

Should have tidied up before the photos tbh, that looks like a shithole.  

[Mooruk]

Lol, Nick

[Onoff]

17 hours ago, Mooruk said:

Thanks for the advice, here's a pic of it to help.

 

The top looks in better nick than mine, also weed and root covered. I did debate casting a reinforced slab on top. 

 

You have I think two chambers...wondering if I have now but it'd mean hacking further into the jungle!

 

Is it brick built, like a beehive in shape? I attempted a video inside ours by just leaning in.

 

 

 

 

[Mooruk]

We did actually have three chambers, one was a leeching pit that acted as a soakaway. However, the roots had completely gone through the perforated bricks so rendered it useless. Now we've had a pipe fitted from the second chamber to a pumping station to soakaway in our garden.... (Which is too small for a standard soakaway.....) Learnt a lot in the last few months!