SEWAGE TREATMENT PLANTS AND SEWAGE SLUDGE
For years, this has been a market segment, struggling with the problem of sewage sludge management. The main purpose of wastewater treatment is the protection of surface water. The wastewater treatment process consists of many individual methods that take place on different objects and in different devices. The most important processes include suspension sedimentation, sorption, chemical oxidation, biological oxidation, mineralization of organic matter. Products from these processes make up for sewage sludge and cannot be used in the agriculture, energy (combustion) sectors, as well as for energy willow (co-firing) and other plants intended for this purpose.
Sewage sludge - organic and mineral matter separated from wastewater during treatment. In the light of limitations related to the natural management of municipal sewage sludge resulting from legal regulations and the lack of potential areas for their possible application, thermal utilization of sludge is a sector of growing interest.
METHODS FOR THE MANAGEMENT OF WASTE
The methods of thermal neutralization of sludge include combustion, co-firing and so-called alternative methods. The introduction of such thermal treatment of sludge is not environmentally friendly because combustion and co-combustion of this matter leave toxic smoke emission and toxic ashes without any idea for their development. Unfortunately, currently known technologies cannot deal with the management of this toxic matter, the legislators adopt statutory solutions contrary to what serves to protect the environment and climate. Such an example is the act from a few years ago, which allowed the introduction of sewage sludge into the agricultural sector. After two years, in grain seeds and perennials were detected heavy metals, which resulted in the limitation of this law to the energy only sector, ie. supplying the soil with sewage sludge of the energetic willow.
THE PRESENCE OF SEWAGE SLUDGE IN THE AGRICULTURE SECTOR AS AN EXAMPLE OF COMMON SENSE
Unfortunately, the technologies we currently know are not able to deal with this toxic matter, which results in the legislators adjusting statutory solutions despite what serves to protect the environment and climate. Such an example is the act from a few years ago, which allowed the introduction of sewage sludge into the agricultural sector. After two years in the grain seeds and perennials, there were detected heavy metals, which resulted in the limitation of this law only to the energy segment, ie. supplying the soil with sewage sludge for energy willow. Such a practice distorts all scientific research because if in the grain seeds and perennials supplied with sludge from sewage sludge there are heavy metals, then energy willow will also contain heavy metals and the mass used for co-firing will emit toxic and dangerous to humans, environment and climate emissions of furans and dioxins.
Another absurdity is allowing sewage sludge to be dried, enriching it with minerals, granulation and sales in the horticulture sector, because not isolated heavy metals will collect their harvest by poisoning people and animals, poisoning groundwater without any consequences for those who invented this practice. We struggle with the effect of civilization having a dilemma whether to store them buried in lagoons or to dry and burn them (drying 1 Tm, ie. about PLN 27)
taking into account the utilization of wastes from this process for which there is no effective solution. The proposed installation described in the N.E.T. Solutions project solves the problem of wet sewage sludge without the need for drying, it eliminates the lagoon created in the waste-free method as a mobile solution to the problem.
SALE OF GRANULES FROM SEWAGE SLUDGE IN THE AGRI-GARDENING SECTOR