about upgrade of aerated lagoon of municipality wastewater treatment, with remove of nitrogen and phosphor , we must convert aerated lagoon to anaerobic, anoxic and aeration tanks.
total deep of aerated lagoons is 4 meter. is it enough for anaerobic and anoxic tanks?
There are many opinion and alternatives to remove phosphorus. As a news for you, you can remove the phosphorus with that depth, and depending on the size, lagoons geometry, hydraulic retention time, and other variables, you could remove the phosphorus without any change on the system, just with install equipments that generates itheir own bacterial.
Of course you will need some electrical power, and this will be without odors.
How much is the hydraulic retention time?
Can you describe the lagoons and send a flow diagram with all the parámeters? How much is the flow, COD,BOD, nitrogen, phosporus, other data you considere important?
No, 4 meters total depth is not enough for anaerobic, but good depth for anoxic tanks. Ready to aid you in the design of the complete degradation. Please share the inlet flow, water parameters, and available unit sizes. You can message me here or email me.
Anaerobic Lagoon Size: 80 x 40 x 5 m (Liquid Depth) for OLR of 0.05 kg/m3.day Anoxic Lagoon Size: 58 x 40 x 3.5 m (Liquid Depth) for OLR of 0.05 kg/m3.Day Aerated Lagoon Size: 40 x 40 x 2.5 m (Liquid Depth) for OLR of 0.16 kg/m3.Day
Hi Behnaz, despite Ruud's concerns about adding methane to the atmosphere, anaerobic ponds are one of the environmentally friendly approaches to removing phosphorous from waste water. (A cattle feed lot produces significantly more methane than an anaerobic pond in a wastewater treatment works). Your pond's depth of 4m should be adequate for an anaerobic pond, although 5m would be preferable. If you intend to put baffels into the existing aerated lagoon to separate the different process units you would need to assess the design volumes required for each process and assess whether you have sufficient volume, alternatively you may need to construct a new anaerobic basin ahead of the existing lagoon. In terms of treatment processes, the UCT process or the Johannesburg process can be recommended. Both these give a fair amount of control to the operator to achieve the desired final effluent quality.
Hi, soemtimes it is easy to ask a question then replying. To my opinion we should get rid of anaerobic ponds. Indeed, they are cheap to make, but thepropblem is that the carbon in the waster is not used properly. About one third disappears as methane gas, a principle 'climate gas' into the atmosphere. And emptying anaerobic ponds is not a nice (shit) affair. What to do, depends so much onthe local situation. One option is to build setlling tanks plus digesters before the ponds (or so-called UASB reactors) . This ovwerview might help you: http://www.waterharmonica.nl/publikaties/Wabo[2034]_2019_The_role_of_WSPs_in_the_urban_water_cycle_towards_a_green_circular_economy_in_Kenya.pdf