The present invention relates to a method for the treatment of bottom ashes deriving from combustion processes, said method comprising a step of storing and aging bottom ashes and a step of grinding stored and aged bottom ashes, as well as a subsequent water washing step of said stored and aged bottom ashes. The water washing step is divided into two distinct washing stages, in every one of which water washing is combined with at least one screening step and one step of sand slime removal and hydrocyclone treatment and between which a further grinding step of the bottom ashes hold by screening in the first washing stage is carried out. The water used to wash bottom ashes is made to continuously recirculate in each washing stage after a step of clariflocculation with chemical treatment and fresh water is supplied in the second washing stage only. Thanks to these features, it is possible to reduce the content in polluting substances contained in the bottom ashes within the limits provided by the present standards concerning their reuse as inert materials, by using a much smaller amount of fresh water than that used in known treatment apparatuses for bottom ashes based on water washing. The invention also relates to an apparatus configured so as to carry out the treatment method.
A process is described for obtaining energy from waste, comprising the following phases: a) bio-drying of municipal solid waste (MSW) to transform it into refuse-derived fuel (RDF), a dry, homogeneous material with piece size of around 20-30 cm, known by the name of RDF; b) compacting of the material obtained from phase a) into bales or BIOCUBI® and storage of the BIOCUBI® in bioreactors; c) activation by wetting with water of the bioreactors to produce biogas by anaerobic digestion; d) combustion at the start of the material obtained from phase a) (RDF) and subsequently of the residue already digested in the bioreactors, and therefore not biodegradable, in a waste combustor provided with a system of purification of combustion gasses and production of superheated steam at approximately 400°C and pressure of around 70 bar; e) combustion of the purified biogas in a conventional boiler provided with re-superheaters for raising the temperature of the steam produced by the waste combustor by approximately 100°C; f) use of the steam produced in this way in a turbine coupled with an alternator for the production of electrical energy. The invention also relates to a system for the implementation of this method.
The method aims at obtaining from waste and more particularly from municipal solid waste (MSW) the energy contained therein at the highest level for industrial use by means of natural technologies and with low environmental impact. The method, denoted by the acronym NEW (Natural Energy from Waste) operates through the following process phases: a) aerobic digestion of the putrescible biological part to produce stabilized waste which is easy to handle, b) separation of a fraction rich in materials with a high heat value, c) storage of the residue, rich in biodegradable and inert substances, compacted into appropriate geometrical shapes in bioreactors which can be activated and sealed, d) activation of the bioreactors with water and their service in time during anaerobic digestion to supply biogas to be used for the production of energy, e) bio-stabilization and dehydration of the residual material of the anaerobic treatment with air, f) possible recovery of the materials produced in this way. In this way the energy contained in the waste, is extracted at the most refined level in the form of plastic, plastic/paper and methane for energy uses with maximum yield and reduced production of ash, and the end material leaving the bioreactors is fully exhausted of its energy content and inertised.
C12P 1/00 - Preparation of compounds or compositions, not provided for in groups , by using microorganisms or enzymesGeneral processes for the preparation of compounds or compositions by using microorganisms or enzymes
C12P 1/02 - Preparation of compounds or compositions, not provided for in groups , by using microorganisms or enzymesGeneral processes for the preparation of compounds or compositions by using microorganisms or enzymes by using fungi
C12P 1/04 - Preparation of compounds or compositions, not provided for in groups , by using microorganisms or enzymesGeneral processes for the preparation of compounds or compositions by using microorganisms or enzymes by using bacteria
C12P 1/06 - Preparation of compounds or compositions, not provided for in groups , by using microorganisms or enzymesGeneral processes for the preparation of compounds or compositions by using microorganisms or enzymes by using actinomycetales
C12P 39/00 - Processes involving microorganisms of different genera in the same process, simultaneously
C12N 1/00 - Microorganisms, e.g. protozoaCompositions thereofProcesses of propagating, maintaining or preserving microorganisms or compositions thereofProcesses of preparing or isolating a composition containing a microorganismCulture media therefor
C12P 7/00 - Preparation of oxygen-containing organic compounds
C12P 7/04 - Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
4.
METHOD FOR THE PRODUCTION OF NATURAL ENERGY FROM WASTE
The method aims at obtaining from waste and more particularly from municipal solid waste (MSW) the energy contained therein at the highest level for industrial use by means of natural technologies and with low environmental impact. The method, denoted by the acronym NEW (Natural Energy from Waste) operates through the following process phases: a) aerobic digestion of the putrescible biological part to produce stabilised waste which is easy to handle, b) separation of a fraction rich in materials with a high heat value, c) storage of the residue, rich in biodegradable and inert substances, compacted into appropriate geometrical shapes in bioreactors which can be activated and sealed, d) activation of the bioreactors with water and their service in time during anaerobic digestion to supply biogas to be used for the production of energy, e) bio--stabilisation and dehydration of the residual material of the anaerobic treatment with air, f) possible recovery of the materials produced in this way. In this way the energy contained in the waste is extracted at the most refined level in the form of plastic, plastic/paper and methane for energy uses with maximum yield and reduced production of ash, and the end material leaving the bioreactors is fully exhausted of its energy content and inertised.
09 - Scientific and electric apparatus and instruments
40 - Treatment of materials; recycling, air and water treatment,
42 - Scientific, technological and industrial services, research and design
Goods & Services
Computer hardware and computer software. Recycling technologies, treatment and disposal of waste. Computer software design; design and creation of industrial technology.
