AEROBIC CO-COMPOSTING OF WWTP RESIDUAL SLUDGE WITH VEGETAL WASTES

Viorel Patroescu, Laurentiu Dinu and Costel Bumbac

Romaqua, 2015, vol. 99, issue 1, 38-44

Abstract: The most preferred method of stabilization of sewage sludge is composting. It is apparently a simple process aimed at stabilization of organic matter – ripening, destruction of pathogenic organisms, and production of an environmental friendly material which can be sold or used as fertilizer. To reach the above aims the sludge has to be mixed with structural materials in suitable proportion to obtain a C:N ratio of about 25:1. In practice, most of the structural materials used contain cellulose (i.e. wooden chips, sawdust, bark, straw, leaf litter, and other vegetal wastes). The present study presents several composting experiments performed using as raw materials: dewatered anaerobic digested sludge from a municipal WWTP, two different vegetal wastes (wood chips and vine shoots) in different proportions and water in order to ensure a 50 to 70% humidity. The experiments were performed using aerated heap method; the heap is arranged on a porous layer, which is aerated by a blower. Composting process evolution was verified during the whole period of 3 months of experimentation by online measurement of temperature, periodic pH and humidity monitoring and by weekly microscopic observations. The quality of the obtained compost was good, similar to commercial products used for pot-flowers, with heavy metal concentrations below the limits imposed by 344/2004 Order.

Keywords: municipal; WWTP; residual; sludge; compost; vegetable; wastes (search for similar items in EconPapers)
Date: 2015
References: Add references at CitEc
Citations:

There are no downloads for this item, see the EconPapers FAQ for hints about obtaining it.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:ris:romaqu:0048

Access Statistics for this article

Romaqua is currently edited by Eduard Stan

More articles in Romaqua from Asociatia Romana a Apei (Romanian Water Association)
Bibliographic data for series maintained by Eduard Stan ( this e-mail address is bad, please contact ).