Evaluation of Sewage Sludge for Further Nutrient Conservation

Abstract

Conversion of organic-containing sludges to a high value fertilizer is considered to be a rational solution from a recycling point of view. Aerobic respiration could serve as an indicator of stability and maturity of the treated sewage sludge (SS). The aim of this study was to characterize two SS samples, obtained from different wastewater treatment plants („D” and „J”), i.e, at the initial stage of treatment, alone and with amendments. Two methods for estimation of microbial respiration, as well as dehydrogenase activity were used. The SS-J demonstrated the higher microbial biodegradation activity, as compared to SS-D. In experiments with OxiTop® device, statistically significant (p<0.05) differences of the pressure drop between SS-J and SS-D have been revealed. Addition of peat to SS resulted in a more intensive pressure drop, compared to non-amended SS, i.e., -145 hPa vs. -76 hPa for SS-D and-199 hPa vs. -180 hPa for SS-J, respectively. The obtained results represent a methodical approach for characterization of raw SS in order to evaluate the amount of aerobically degradable organic substances and intensity of their oxidation. Further research is needed for highlighting the mechanisms responsible for interrelation of respiration intensity, bacterial community activity and other metabolic changes towards SS stabilization.

Application of the Sewage Sludge in Agriculture: Soil Fertility, Technoeconomic, and Life-Cycle Assessment

“…Comparison of physicochemical characteristics of SS of different origins showed that average concentrations of nitrogen, phosphorus, and potassium are similar and reach up to 3.20%, 1.75%, and 0.5% per kg of treated dry SS, respectively [15][16][17]. Often the potassium content in SS is considered insufficient for plant nutrition [8].…”

Improvement of the Quality of the Human Environment by Transporting and Stabilizing Sewage Sludge for Further Processing

“…The scientific literature provides data on the texture of sewage sludge. The biochemical composition of WWS [8,9] and the biological processes occurring in it [10,11] have been well studied. The high agronomic value of sewage sludge is noted [12,13].…”

Інноваційне Вирішення Проблеми Нейтралізації Осаду Стічних Вод

“…У ході досліджень, здійснених у співпраці з Institute of Soil and Plant Sciences, Latvia University of Life Sciences and Technologies, University of Latvia, Institute of Microbiology & Biotechnology, вивчені біологічні, фізико-хімічні параметри та мінеральний склад зразків опадів і отриманого добрива, проведені експерименти на рослинах [3][4][5]. На підставі досліджень зразків осаду, взятих у різних регіонах України, ЄС, СНД, Близького Сходу і Перської затоки, і зразків вироблених добрив можна констатувати відповідність регульованих показників національним нормативам для застосування при лісопосадках, в квітникарстві, для вирощування технічних, декоративних, сидеральних, кормових і зернових культур, в особистому підсобному господарстві.…”