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Phosphorus speciation in sewage sludge

Bezak-Mazur E., Mazur A., Stoińska R.

Environment Protection Engineering

2014

Vol. 40, nr 3

161--175

Excessive sewage sludge in terms of contained phosphorus speciation forms has been characterized. The analysis allowed identification of mobile forms of phosphorus in sewage sludge. Quantification of mobile forms of phosphorus is very important for its recovery directly from sewage sludge or for its application for natural purposes. Various phosphorus speciation methods have been presented. The results of the sewage sludge speciation conducted by means of two types of wastewater treatment (EvU-Perl technology and activated sludge) have been compared. The analysis covered the effect of such physiochemical factors as oxygenation, use of ultrasound and precipitation with iron chloride(III). It was concluded that changes in physiochemical conditions lead to alterations in the content of phosphorus speciation forms in sewage sludge.

Związki chloroalifatyczne w substancjach odpadowych. Część 1. Identyfikacja związków chloroalifatycznych w kompostowanych osadach ściekowych

Żak S., Gaca J.

Ekologia i Technika

2000

R. 8, nr 5

151-155

Results of studies on the changes of chloroaliphatic compound content during composting of sludges have been presented. The investigations were conducted on sludges formed during the treatment of municipal and industrial wastes (from fat industry - vegetable fat processing). The sludges contained excessive amounts of chlorides, iron and aluminium resulting from application of coagulation on FeCl3 and AlCl3 over the sewage treatment. Stabilized sludges were composted by pile method after previous homogenization with postcrop residues (wheat and barley). An analytic method allowing qualitative analysis of chloroaliphatic compounds by gas chromatography (GC) coupled with mass spectrometry (GC-MS) was elaborated. The following compounds were identified: methylene chloride, ethyl chloride, propyl chloride, 1-chlorobutane, 1-chloropentane, 3-methylchloropropane-1 and 3-methylchlorobutane. Relations between the amount of iron and aluminium chlorides and the content of aliphatic compounds have been observed. It was found that the compounds mentioned above were formed parallel to humification of the sludge mass subject to composting.