Analysis of Sewage Sludge Disposal Routes – Varazdin and Medimurje County

The aim of this paper is to analyse sewage sludge production at the level of Medimurje and Varazdin counties with economic analysis of acceptable technical/technological solutions for sludge management routes. The topic is very broad, so the focus was placed on four variants of sludge disposal, which were determined by preliminary analysis to be the most applicable for the area in question. These are: 1) disposal of sewage sludge in agriculture, 2) incineration of sludge in a central mono-incinerator, 3) composting for the area of Varazdin County and at the same time use of sludge reed beds for the area of Medimurje County, and 4) export of sludge outside the state borders. Based on the analysis carried out for the described four variants, sludge incineration in a regional mono-incinerator turned out as the economically most advantageous solution, while the variant that includes disposal of sludge in agriculture has showed as the most expensive one. The last one also showed the largest range of costs uncertainties, but the mentioned facts are greatly influenced by unfavourable legislation, the changes of which in a more rational direction would greatly contribute to the greater competitiveness of this variant. Overall, taking into account the lowest cost and uncertainties in the predicted unit costs, the sludge composting in the Varazdin County and the construction of a reed beds for the Medimurje County, turned out to be the optimal variant. This solution is also the one that was ultimately adopted in practice

Analysis of sewage sludge disposal routes - Varaždin and Međimurje County

Otpadne vode prikupljene sustavom javne odvodnje odvode se na uređaj za pročišćavanje otpadnih voda te se nakon postizanja tražene razine pročišćavanja ispuštaju u recipijent. Nusproizvod svakog tehnološkog postupka obrade komunalnih otpadnih voda je mulj koji zahtijeva daljnju obradu i zbrinjavanje na tehnički i ekološki najpogodniji i istovremeno najekonomičniji način. Cilj rada je analiza produkcije mulja na razini Međimurske i Varaždinske županije te analiza ekonomski prihvatljivih tehničko – tehnoloških rješenja obrade i zbrinjavanja mulja. Tema je vrlo široka pa je fokus stavljen na četiri varijante zbrinjavanja mulja za koje je preliminarnim analizama utvrđeno da su najprimjenjivije za predmetno područje. Analizirane su mogućnosti zbrinjavanja mulja u poljoprivredi, spaljivanje mulja u centralnoj monospalionici, varijanta s istovremenim kompostiranjem za područje Varaždinske županije i ozemljavanja mulja na području Međimurske županije te varijanta koja uključuje odvoz mulja izvan granica Republike Hrvatske. Temeljem provedenih analiza za opisane četiri varijante spaljivanje mulja u regionalnoj monospalionici predstavljeno je kao ekonomski najpovoljnije rješenje, dok je varijanta koja uključuje zbrinjavanje mulja u poljoprivredi prikazana kao najskuplja, no ona također predviđa i najširi raspon troškova te prikazuje da se uz donošenje racionalnije zakonske regulative, odnosno smanjenjem troškova uzorkovanja i analiza mulja i tla može očekivati i daleko bolja ekonomska isplativost ove varijante. Također je dan pregled zakonske regulative vezane uz obradu i zbrinjavanje mulja s uređaja za pročišćavanje otpadnih voda, prikazane su opće informacije o sadržaju mulja, obradi i metodama zbrinjavanja, ali i informacije o aktualnim postupcima zbrinjavanja mulja u ostalim europskim zemljama.The wastewater collected by the public sewage system is taken to the wastewater treatment plant and after reaching the required level of treatment, it is discharged into the recipient. The by-product of every technological process of municipal wastewater treatment is sludge, which requires further treatment and disposal in the most technically and ecologically appropriate and at the same time most economical way. The aim of this paper is the analysis of sludge production at the level of Međimurje and Varaždin counties and the analysis of economically acceptable technical and technological solutions for sludge treatment and disposal routes. The topic is very broad, so the focus was placed on four variants of sludge disposal, which were determined by preliminary analyzes to be the most applicable for the area in question. The possibilities of disposal of sludge in agriculture, incineration of sludge in a central mono-incinerator, a variant with simultaneous composting for the area of Varaždin County and use of sludge reed beds for the area of Međimurje County and a variant that includes the export of sludge outside the state borders were analyzed. Based on the analyzes carried out for the described four variants, sludge incineration in a regional mono-incinerator is presented as the most economically advantageous solution, while the variant that includes disposal of sludge in agriculture is shown as the most expensive, but it also predicts the largest range of costs and shows that with the adoption of more rational legislation, that is, by reducing the costs of sampling and analysis of sludge and soil, a much better economic profitability of this variant can be expected. An overview of the legal regulations related to the treatment and disposal of sludge from wastewater treatment plants is also given. Also, general information on sludge content, treatment and disposal methods are presented, as well as information on current sludge disposal procedures in other European countries

Analysis of sewage sludge disposal routes - Varaždin and Međimurje County

Otpadne vode prikupljene sustavom javne odvodnje odvode se na uređaj za pročišćavanje otpadnih voda te se nakon postizanja tražene razine pročišćavanja ispuštaju u recipijent. Nusproizvod svakog tehnološkog postupka obrade komunalnih otpadnih voda je mulj koji zahtijeva daljnju obradu i zbrinjavanje na tehnički i ekološki najpogodniji i istovremeno najekonomičniji način. Cilj rada je analiza produkcije mulja na razini Međimurske i Varaždinske županije te analiza ekonomski prihvatljivih tehničko – tehnoloških rješenja obrade i zbrinjavanja mulja. Tema je vrlo široka pa je fokus stavljen na četiri varijante zbrinjavanja mulja za koje je preliminarnim analizama utvrđeno da su najprimjenjivije za predmetno područje. Analizirane su mogućnosti zbrinjavanja mulja u poljoprivredi, spaljivanje mulja u centralnoj monospalionici, varijanta s istovremenim kompostiranjem za područje Varaždinske županije i ozemljavanja mulja na području Međimurske županije te varijanta koja uključuje odvoz mulja izvan granica Republike Hrvatske. Temeljem provedenih analiza za opisane četiri varijante spaljivanje mulja u regionalnoj monospalionici predstavljeno je kao ekonomski najpovoljnije rješenje, dok je varijanta koja uključuje zbrinjavanje mulja u poljoprivredi prikazana kao najskuplja, no ona također predviđa i najširi raspon troškova te prikazuje da se uz donošenje racionalnije zakonske regulative, odnosno smanjenjem troškova uzorkovanja i analiza mulja i tla može očekivati i daleko bolja ekonomska isplativost ove varijante. Također je dan pregled zakonske regulative vezane uz obradu i zbrinjavanje mulja s uređaja za pročišćavanje otpadnih voda, prikazane su opće informacije o sadržaju mulja, obradi i metodama zbrinjavanja, ali i informacije o aktualnim postupcima zbrinjavanja mulja u ostalim europskim zemljama.The wastewater collected by the public sewage system is taken to the wastewater treatment plant and after reaching the required level of treatment, it is discharged into the recipient. The by-product of every technological process of municipal wastewater treatment is sludge, which requires further treatment and disposal in the most technically and ecologically appropriate and at the same time most economical way. The aim of this paper is the analysis of sludge production at the level of Međimurje and Varaždin counties and the analysis of economically acceptable technical and technological solutions for sludge treatment and disposal routes. The topic is very broad, so the focus was placed on four variants of sludge disposal, which were determined by preliminary analyzes to be the most applicable for the area in question. The possibilities of disposal of sludge in agriculture, incineration of sludge in a central mono-incinerator, a variant with simultaneous composting for the area of Varaždin County and use of sludge reed beds for the area of Međimurje County and a variant that includes the export of sludge outside the state borders were analyzed. Based on the analyzes carried out for the described four variants, sludge incineration in a regional mono-incinerator is presented as the most economically advantageous solution, while the variant that includes disposal of sludge in agriculture is shown as the most expensive, but it also predicts the largest range of costs and shows that with the adoption of more rational legislation, that is, by reducing the costs of sampling and analysis of sludge and soil, a much better economic profitability of this variant can be expected. An overview of the legal regulations related to the treatment and disposal of sludge from wastewater treatment plants is also given. Also, general information on sludge content, treatment and disposal methods are presented, as well as information on current sludge disposal procedures in other European countries