UTILIZATION OF SEWAGE SLUDGE FROM ACID CASEIN PRODUCTION FOR SOIL FERTILIZATION

Organic biodegradable waste composes a fair part of farm and vital activity waste. The disposal of this waste in municipal waste landfills pollutes the environment and soil. Therefore, the European Union and other countries look for alternatives to manage biodegraded waste. This paper seeks to analyse the properties of sludge that forms in the sewage treatment plants of the acid casein production, examines experience in managing and applying sludge. The results of an experiment show that sewage sludge from the acid casein production is suitable as a soil fertilizer for growing lettuce (Lactuca sativa L.) and garden cress (Lepidium sativum L.). After soil was fertilized with this sludge, the germination of lettuce and garden cress as well as the biomass of experimental alimentary plants increased. A suitable ratio of soil and sludge mixture was determined (for lettuce ‐ 1:1, for garden cress ‐ 3:1). Potassium sulphate which was added to a soil‐sludge mixture improved the values of fertility parameters of alimentary plants.

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Phytotoxicity test applied to sewage sludge using Lactuca sativa L. and Lepidium sativum L. seeds

International Journal of Environmental Science and Technology ◽

10.1007/s13762-017-1386-z ◽

2017 ◽

Vol 15 (2) ◽

pp. 273-280 ◽

Cited By ~ 7

Author(s):

P. Mañas ◽

J. De las Heras

Keyword(s):

Sewage Sludge ◽

Lactuca Sativa ◽

Lepidium Sativum ◽

Lactuca Sativa L ◽

Phytotoxicity Test ◽

Lepidium Sativum L

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Sludge Treatment and Disposal Systems for Rural Areas in Germany

Water Science & Technology ◽

10.2166/wst.1993.0190 ◽

1993 ◽

Vol 27 (9) ◽

pp. 159-171 ◽

Cited By ~ 3

Author(s):

Eberhard Steinle

Keyword(s):

Sewage Sludge ◽

Rural Areas ◽

Public Awareness ◽

Sewage Treatment ◽

Treatment Needs ◽

Sludge Treatment ◽

Sewage Treatment Plants ◽

Sewage Purification ◽

Treatment And Disposal ◽

Nitrogen Phosphorus

First an overview of the systems currently in use and being discussed for sludge treatment is presented will) particular emphasis on distinguishing between the object of the system (conditioning objective of the various phases in the system) and a system concept (concept of various phases of the system in sequence to attain the disposal objective). More detailed information is given as to the salient systems as used with smaller sewage treatment plants in rural areas, such as digestion, dewatering, hygienization, composting and thermal drying. A further item of discussion is how sludge treatment influences the sewage treatment process. For the critical emissions (nitrogen, phosphorus) demanded in Germany, and thus for the degree of sewage treatment required, the load of the sewage treatment system resulting from sludge treatment needs to be taken into account. Accordingly, operation of sludge treatment and sewage purification must always be harmonized. The extent of these return loads also limits the spatial centralization of the system phases; this applies in particular to smaller sewage treatment plants in rural areas. In conclusion, an attempt is made to present a perspective for the agricultural utilization of such sludge in Germany. Since the critical values for emissions have been further tightened by new regulations, thus considerably elevating the associated sophistication of monitoring techniques, it is to be expected that the use of sewage sludge in agriculture will also be further reduced in rural areas, especially since public awareness of emission control has considerably reduced the acceptance of sewage sludge as fertilizer.

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