Physical-chemical and nutritional parameters of liquid porcine effluent from a biodigester supplemented with a lagoon system.

Resumen

Objetive. Determining the concentration of physical-chemical and nutritional parameters of the wastewater derived from a biodigester complemented with lagoon train.

Metodology. A study was carried out in the CEAJAL livestock production module, 12 gestating sows, fresh solid excreta was collected manually (shovel and wheelbarrow), the lagoon-type biodigester was fed daily with two levels of organic load (CO), CO5% and CO15%. The biogas and wastewater were evaluated in four periods of 40 days each. The Influent washing water (INF) entered the biodigester, then the liquid effluent (EFL) was subjected to complementary treatment of EFL stabilization pits, Pit 2, Pit 3 and Pit 4, determining physical-chemical parameters such as TSS, pH, CTE and COD, and nutritional parameters such as NT and FT. The data were analyzed using descriptive and differential statistics.

Results. The methane content in the biogas was 59.8%; CO5% and 60.2%; CO15% (p>0.05). The physical-chemical parameters of INF such as SST ml/L was 67.4; CO5% and 81.3; CO15%. EFL was 23.2 and 48.0, respectively, in COD ml/L of INF was 738.7; CO5% and 1807.7; CO15%. EFL was 1444.2 and 2522.5, respectively, in NT ml/L of INF was 128.3; CO5% and 111.9; CO15%. EFL was 436.9 and 554.6, respectively.

Conclusions. Despite a lower CO, methane production is in the normal range and the physical-chemical and nutritional parameters of the wastewater as it passes into stabilization lagoons can be taken as a reference to determine the CO that should enter to the biodigester with the    purpose of providing complementary treatment of the wastewater generated in pig farms.