Estudo da remoção de nitrogênio amoniacal em uma série longa de lagoas de estabilização tratando esgotos domésticos em região de clima tropical.

Abstract

This work describes the study of ammoniacal nitrogen removal in a long series of stabilization ponds, consisting of an anaerobic lagoon (IIA) followed secondary pond (F26) and eight maturation lagoons (M25 to M32) in pilot scale, with a total hydraulic detention time of 19 days and a depth of 1.50 m. The experimental system was located in the Catingueira of the city of Campina Grande (7º 13 '11 "S, 35 ° 52' 31" W, 550 m above sea level), state of Paraíba, northeast Brazil. the research conducted under the responsibility of EXTRABESTUFPb (Experimental Station for Biological Treatment of Sanitary Sewers - Federal University of Paraíba). The routine monitoring of the experimental system occurred from August 15 to December 15, 1991 and was based on the analysis of samples of raw sewage, raw sewage with daily composite samples and pond effluents, collected twice a week at 8 o'clock in the morning. In this state, in addition to the nitrogen ammonia (N - NH + 4) parameter, nitric nitrogen (N - NO3) chlorophyll a (CLA), pH, temperature (T), dissolved oxygen (OD), transparency and (BOD 5,20) .The total ammonia removal was only 20.60% calculated on the basis of the mean (32.50 mgN / t) of the concentration of the compound raw sewage (EBC) and the mean (25 , 80 mgN / I) of the final effluent concentration of the series.The low removal shown can be attributed to the low pH values ​​which inhibited the volatilization of the ammonia and the reduced algal biomass responsible for small biological assimilation.On the other hand, the sanitary quality of the effluent expressed as BOD5 and the concentrations of ammoniacal nitrogen presented indicate that the effluent from the series can be used with advantages in irrigation avoiding the eutrophication of receiving aquatic bodies and collaborating with the community economy.

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