Petro, I think solar powered ...
Published by Shahid Chaudhry, Sr. Mech. Engr. / W-E Nexus Spec. / Member: USEPA's BOSC Exec. Committee and SSWR Subcommittee
Petro, I think solar powered laminar flow water circulators should solve your problem. The water circulators move DO rich top layer water to the bottom of the lagoon where water is short of DO thus enhancing organics biodegradation process resulting in shortening the detention time. I am familiar with two brand names available in the market – Solar Bee (USA) and ResMix (Australia); there might be few other brand names in the market. The technology really works and I am familiar with many applications; but you should do your due diligence and communicate with the suppliers for better price and performance guarantees. Any questions, please feel free to drop me an email. All my best. Shahid Chaudhry (sfc95823@yahoo.com).