Abstract
The present study aimed to assess the anaerobic digestion of sewage from cellulose industry mixed with doses of glycerin, in order to produce biofertilizer and biogas, for agriculture and energy purposes. Five anaerobic reactors were developed, which were fed with effluent and doses of glycerin (0, 5, 10, 15 and 20% v v-1) and evaluated during the hydraulic retention time of 42 days. The physical and chemical parameters were evaluated every seven days: temperature; pH; turbidity; series of solids; total phosphorus (Ptotal); Kjeldahl nitrogen (Ntotal) and COD; as well as the levels of K, Ca, Mg, Cu, Zn, Fe, Mn and Cd, Pb and Cr; biogas production was evaluated daily. The anaerobic treatment produced biofertilizer with excellent nutritional conditions, with adequate levels of P, K, Ca, Mg, Mn, Fe and Zn. The addition of glycerin increased biogas production, with 15% and 5% of glycerin, respectively producing 0.54 and 0.40 mL L-1 d-1. The treatments of 15% and 5% of v v-1 glycerin also exhibited greater removal of COD. However, the low levels of N have caused problems in the anaerobic process. Anaerobic digestion of the cellulose industry effluent with 5 and 15% of glycerin (v v-1) provided increase in biogas production of 0.54 and 0.40 mL L-1 d-1, respectively. K, Ca, Mg, Zn, Fe and Mn at the final biodigestion remained with excellent levels for use in crops as biofertilizer.
Highlights
Brazil is a major world producer of paper, besides supplying the domestic market, it exports products mainly to countries of Latin America, the European Union and North America (Bracelpa, 2013).This industrial segment is one of the most competitive in the country, the quality standard is one of the best in world, and the market is globalized and strongly active
The higher the dose of glycerin added to the system, the higher is the concentration of TS, because with such increase, the concentration of VS is increased, since the glycerin [C3H5(OH)3] is basically composed of carbon, hydrogen and oxygen
The acidification of the medium occurs due to the presence of the glycerin, which directly affects the microbial metabolism inside the digesters, causing a substantial increase of the substrate and raising the population of bacteria quickly, provoking the presence of organic acids in the biodigester origin of the acidogenic phase (Simm et al, 2017)
Summary
Brazil is a major world producer of paper, besides supplying the domestic market, it exports products mainly to countries of Latin America, the European Union and North America (Bracelpa, 2013). This industrial segment is one of the most competitive in the country, the quality standard is one of the best in world, and the market is globalized and strongly active. The majority of paper production comes from the pulp of short eucalyptus fibers, which the country is the largest producer in the world These fibers are mainly used in the manufacture of papers with high benefit (Montebello & Bacha, 2013). The sector generates a large amount of effluent, reaching a value of 1 m3 per ton of produced paper (Priadi et al, 2014), and has been seeking development in environmental issues, especially liquid effluents generated in production processes, which, due to highly polluting characteristics and high volume, when released without adequate treatment, aggressively impair the quality of the receiving water body (CETESB, 2008)
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