Review of current effects of treatment plant slime use in agriculture
Short description:
The study focused on:
A. Analysis of the current situation in Romania in terms of the treatment plant slime use in agriculture;
The main UE norm regulating management of the treatment slime use in agriculture is Directive 86/278/CEE from June 12, 1986. In Romania, the treatment slime issue is regulated by order no. 344 from August 16, 2004.
The centralisation of the data in annual treatment plant slime use reports reveals a rise in slime agriculture use. The 18% of the 2003-generated slime used in agriculture turned into 29% of the 2005-generated slime.
A great many Romanian waste-water treatment plants are provided with mechanical step and biological step.The mechanical step consists of: rare and compact grates, desander, pumping station, primary slime pit. The biologic step consists of: aeration tanks, secondary slime pits, recirculated slime and exceeding slime pumping station.
The slime line in existing treatment plants either operates poorly or is decommissioned. The slime treatment line is made up of gravitational concentrator, slime fermentation tanks and drying platforms. Most of the times, the rough slime resulting from the treatment process gets deposited directly on the drying platforms, the only slime treatment being natural dehydration.
In order to treat and eliminate the slime failing to be up the requirements for agriculture use, the following are used:
• incineration
• storing within the treatment plant precincts or at the environmentally friendly ramp meant to store domestic waste.
Over the last years, there were several projects in Romania related to modernisation of the municipal waste water treatment plants. Most of the projects comply with the requirements of EU directives regarding water.
B. Evaluations of treatment plants slime agriculture use, after 2 years of monitoring.
The treatment plants slime agriculture use is one of the ways of removing it and using its organic and nutrients content. The research regarding treatment plants slime agriculture use revealed the soils behaviour and plants production.
To diminish the polluting effect of the treatment slime to be used in agriculture and use the nutrients contained, the slime requires proper treatment, application only on fit soils, in established doses and periods, for certain recommended cultures, and appropriate environment factors quality control..
The treatment slime quantities or doses to be applied on agricultural soils cannot be recommended as they have to be calculated according to slime heavy metal content and soil heavy metal content. A further factor to be considered on establishing the doses is the demand of nutrients of the crop but this factor is relative as the excessive slime dose increase can result in increased heavy metal content of the soil and plants.
Considering the studies results and legislation in force on slime use, we recommend the treatment plants modernisation also include slime treatment technology for its use in agriculture.
C. Issue a brochure in Romanian language and English language dealing with the treatment slime use in agriculture in Romania.
Services offered:
Feasibility study
Country and Location:
Romania, Bucharest
Client:
Environment and Water Management Ministry
Start / Completion date (commissioning):
November 2006 - December 2006
-
enlarge image
