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General characteristics of the quantity and quality of sewage sludge from selected wastewater treatment plants in the Świętokrzyskie Province

Gawdzik J., Długosz J., Urbaniak M.

Environment Protection Engineering

2015

Vol. 41, nr 2

107--117

Five wastewater treatment plants from the Świętokrzyskie Province have been briefly described, and a general analysis of the composition and quantity of sewage sludge from the data objects has been conducted. The paper also presents various ways of management of sewage sludge. The authors analyzed sediments from the wastewater treatment plant for PE in the range of 15 000–99 999 located in Ostrowiec, Opatów, Starachowice, Skarżysko-Kamienna, and in Sandomierz. The sludge was characterized in terms of its quantity and quality, the content of heavy metals, total nitrogen, total phosphorous, and organic solids.

The impact of the sewer system rinsing on the wastewater composition

Sadecka Z., Płuciennik-Koropczuk E., Myszograj S., Suchowska-Kisielewicz M., Jakubaszek A.

Environment Protection Engineering

2013

Vol. 39, nr 2

5--13

The paper presents the results of research on the influence of the operational rinsing of a sewer system on the composition of raw sewage, the effectiveness of the operation of the mechanical part of a wastewater treatment plant and changes in the technological parameters of the biological reactor. The results of the research have shown an increase in sewage pollution during the rinsing of the sewer system. The value of the COD indicator increased from 799 to 1306 mg/dm3, BOD5 from 538 to 1044 mg/dm3, and total suspended solids from 259 to 1508 mg/dm3. The calculations indicate that an increase in the concentrations of pollution during the rinsing of the sewer system requires a high working efficiency of the mechanical part of the wastewater treatment plant. With a low efficiency the volume of the biological reactor can increase even by 30%.