CODCr, NH4+-N, nitrite (NO2−-N), nitrate (NO3−-N), sludge volume index with 30 min settling time (SVI30), mixed liquor suspended solids (MLSS) and mixed liquor volatile suspended solids (MLVSS) were analyzed in accordance to the Standard Methods [ 20].
The objective of this study was to investigate possible effects of different companies and types of swine operations on the availability of N in sludge from their associated lagoons.
Moreover, compared to some commonly used N-containing chemical fertilizers such as urea (46 %), ammonium sulfate (21 %) and diammonium phosphate (18 21 %), which contained extremely higher concentrations of N, textile sludge was found to be low in TN content (0.47 %).
Both residual iron and calcium conditioners were capable of reacting with protein-N in sludge and char to form FeαN and CaCxNy, respectively.
Due to the mass transfer (of oxygen, NH4-N, and NO3-N) inside the sludge pellet, it induced the aerobic zone for nitrification at the pellet surface and the anaerobic zone for denitrification at the pellet core.
This relationship indicated that of the 200 mg of total sludge N added per kg soil, 23.5% was in the form of potentially mineralizable organic N (No) and 17.5% was in the form of inorganic N (Ni).
Information on availability of nitrogen (N) in the sludge is needed to improve application recommendations for crops.
The purpose of this study was to evaluate whether experimental exposure of pregnant sheep to a mixture of environmental chemicals added to pasture as sewage sludge (n = 9 treated animals) exerted effects on fetal testis development or function; application of sewage sludge was undertaken so as to maximize exposure of the ewes to its contents.
According to the results, the conversion of sludge-N to gas-N at 873 1273 K was strengthened by composite conditioning during the pyrolysis process.
The formation of complex Ca2Fe2O5 facilitated the decomposition of these intermediates, thus facilitating the conversion of sludge-N and NOx precursors (tar-N, NH3, HCN) to N2, achieving a highest non-polluting gas yield of 80.5%.
Thus, inorganic N accumulation from all sludge sources was fit to a first order equation [Nt=Ni+No(1−e−kt)].
