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SOIL CARBON AND SEWAGE WATER

Clara Tudor

Abstract

The soil carbon pool plays a major role in the global carbon cycle, in the context of climate change. Small changes in the soil carbon pool can increase or decrease greenhouse gas. One of the ways to mitigate to rise in atmospheric CO2 is sequestration of C by soils. In the SW of Romania, in Timis county, there are 32 industrial zootechnical piggery complexes, with a daily number of 449904 per capita. From these complexes results about 5.7 mill m3/year sewage water, which produced by biochemically transformation 2.13 mill m3/year CO2. The sewage water is settled in the ponds for decanting and after 3-5 months are used as fertilize application by placement. The scientific researches were made on the piggery complex Parta which has 37225 pigs. Sewage water is added in a favorable period, with a set of cistern ? scarifier, on March 15th and October 31th, in the years 2015, 2016 and 2017. The number of plots varied per anum: in the year 2015 ? 156 plots with an area of 568 ha; in the year 2016 ? 30 plots with 350 ha; in the year 2017 ? 67 plots with 146 ha. On the basis of a soil and agrochemical survey, with 44 principal soil profiles, were sampling 229 soil samples. The main soil analyses were: pH, humus, mobile phosphorus and potassium degree of base saturation. For the liquid organic manure, the chemical analyses were: pH, Ntotal, P2O5, K2O, organic matter content and humidity. Contamination of soils can also occur at all scales and we oversee the phenomena, in order to protect soil. The contamination risk is really especially on the plots where the sewage water application was made with 70-100 cubic metres on hectare, and the soil has a great permeability and the ground water layer is at 1-2 m depth. Apart from the sequestration of carbon by soils, sewage water represents a source of nutrients. The liquid organic manure contains: Ntotal (0.15-0.16%), P2O5 (0.0087-0.046%), K2O (0.11-0.28%), SOM (62.5-72.05%, from dry matter), and water content (98-99%)

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DOI resolver: doi.org/10.5593/sgem2018/3.2/s13.062

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