Background: Initial and secondary precipitates of waste water are transported to irrigation fields usually in the vicinity of collectors. In due course the bio-sludge is getting dry at natural conditions however there is a transmission of pollutants into soil, ground water as well as air observed at the expense of aerosols and microorganisms along with their metabolic products transfer. Unambiguously such way of bio-sludge utilization is hazardous from ecological and sanitary points of view [Saleem M., Al-Malack M., 2001.]. In this context anaerobic digestion is considered as one of the best options in controlling such waste products. Anaerobic digestion is a natural biological process as the result of which complex organic matters are broken up to simple molecules at anaerobic conditions by mutual action of four groups metabolic bound hydrolytic, acidogenic, acetogenic and methane-forming microorganisms. As a result there are production of renewable source of energy (biogas) and formation of nonpathogenic nutrient rich fertilizers [Guo J., Peng Y., 2015; Ly W., Schanbacher F.L., 2010; Eriksson O., Reich M.C., 2005.]. Study tasks: conduct physical and chemical characteristics of bio-sludge from Almaty city (Kazakhstan) waste water sludge compactors and justify the bio-sludge exploitation to derive biogas. Methods: Bio-sludge from waste water sludge compactors and cattle were used in the study. pH, total organic carbon (TOC), total nitrogen, chemical oxygen demand (COD), biological oxygen demand (BOD5), solid residue, alkalinity, ammonium (NH4+) were determined in the bio-sludge. Methane concentration was determined by anaerobic digestion at mesophilous conditions applying gas-analyzer BlueSens Yieldmaster. Results: The following was determined in the cattle bio-sludge: pH 6.4 +/- 0.8, TOC 17124 +/- 671.8 mg/L, total nitrogen 12.5 +/- 0.8 mg/L, COD 13478 +/- 691 mg/L, BOD5 45.3 +/- 9.2 mgO(2)/dm(3), solid residue 22.6 +/- 9.2 g, alkalinity 47 mg/L, NH4+ 38.9 +/- 9.2 mg/L. And the following was determined in the bio-sludge from waste water sludge compactors: pH 6.8 +/- 0.9, TOC 661 +/- 0.04 mg/L, total nitrogen 98 +/- 17.3 mg/L, COD 986 +/- 98 mg/L, BOD5 12.0 +/- 3.2 mgO(2)/dm(3), solid residue 2.82 g, alkalinity 20.0 mg/L, NH4+ 8.9 +/- 0.2 mg/L. There was no generation of methane when exploiting bio-sludge from waste water sludge compactors. On the contrary, mutual exploiting this bio-sludge with the cattle one in 1:1 ratio led to methane generation which had begun in 70 hrs since incubation commencement and had been in progress more than 27 days with its overage concentration 5-7 volume/%. After anaerobic digestion completion effluent physical and chemical characterization was conducted. It was determined that while compactors bio-sludge incubation pH was 6.6 +/- 0.05, TOC - 290 +/- 45.8 mg/L, total nitrogen - 0.55 +/- 0.008 mg/L, BOD5 - 7.6 +/- 0.4 mgO(2)/dm(3). At its combined incubation with cattle bio-sludge the parameters were: pH 7.1 +/- 0.07, TOC 377 +/- 56.1 mg/L, total nitrogen 0.43 +/- 0.002 mg/L, BOD5 35.2 +/- 0.9 mgO(2)/dm(3). Conclusions: Thus, combining bio-sludge from waste water with cattle one may be considered as effective way of city waste water sediment utilization and additionally biogas generation.
