Advanced Installation, Construction and Technological works are carried out under the project "Expansion and reconstruction of the wastewater treatment plant and organization of water and sewage management in Łomża". Currently, advanced modernization works of the second preliminary settling tank are in progress, a new bottom layer has been built, repair and insulation works are underway on the resin walls. Communication bridges were installed between the digesters. The assembly of the flare and the biogas tank on the newly made foundations and the aeration grate of the new biological reactor C have been completed.