ES2818399A1 - System for adsorption of pollutants from sludge and wastewater through fly ash from biomass combustion (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Cylindrical tank that allows the agitation of sludge and/or wastewater in continuous contact with adsorbent material for heavy metals and/or other pollutants, contained in lattice cartridges to facilitate their separation and subsequent recovery. Such adsorbent material would be formed by a mixture of lime and fly ash from biomass plants, solving the problem of managing this type of waste. On the other hand, sewage sludge and/or wastewater contain levels of heavy metals that are polluting and harmful to health. After the agitation process, the decontaminated sludge is moved out of the tank and reused as fertilizers. To complete the cycle, the adsorbent material contained in the tank cartridges and composed of fly ash can be reused to make lower cost construction materials with less environmental impact. This material is recovered by removing the movable cartridges from inside the tank. (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

SLUDGE AND WATER POLLUTANT ADSORPTION SYSTEM

RESIDUALS THROUGH FLYING ASHES FROM COMBUSTION

BIOMASS

TECHNICAL SECTOR

The present invention relates to a system for the adsorption of heavy metals and other pollutants from sewage and / or sewage sludge using fly ash from biomass combustion. This device makes it possible, on the one hand, to use treated sewage sludge as low impact fertilizers. On the other hand, the resulting ash aggregates after treatment allow their use in recyclable building materials with low environmental impact.

BACKGROUND OF THE INVENTION

The use of fly ash as an adsorbent for heavy metals or other pollutants is known from various published studies. In general, these are procedures disclosed in scientific journals such as those indicated below: Revista Ingeniería y Región, 13 (1) (2015) 73-90.

Progress in Energy and Combustion Science, 36 (2010) 327-363

Journal of Hazardous Materials, 148 (2007) 538-547

There are also patents for devices related to the purification of wastewater. For example, the one relating to patent ES-2142193_A1 represents a mobile suction-impulsion equipment for sludge for general cleaning. Another patent, with reference ES-2216203_T3, presents a device for the reception and treatment of contaminated substrate, especially mud, which is aspirated during the cleaning of a channel, with a dirt reception space.

However, it does not exist or has not been found by applicants, devices or systems that use fly ash from biomass combustion as heavy metal adsorbent material for the purification of wastewater or sludge.

. EXPLANATION OF THE INVENTION

In order to improve wastewater purification systems, the invention proposes a device for implantation in an industrial treatment plant that incorporates biomass combustion fly ash to adsorb heavy metals and other organic pollutants. Starting from this, the present invention presents a system that jointly solves different problems such as the management of fly ash waste from biomass combustion plants, as well as the management of polluted water from industrial areas. In turn, the sewage sludge treated with fly ash can be used as fertilizers, satisfactorily enriching another sector different from those mentioned in an ecological way. To close the cycle of advantages and applications of the device, another advantageous measure would be the reuse of the fly ash used in the treatment of sludge and / or wastewater as a substitute component for cements in construction materials, which not only makes the process of manufacturing but is an environmental impact advantage.

In this sense, inter-industry collaboration increases productivity and economic competitiveness, in a sustainable and long-term manner. Additional efficiency measures are being integrated for the optimized use of energy, water and materials.

The equipment to be patented comprises a stirring and adsorption tank with the basic characteristics detailed in the following sections:

It is a tank built in stainless steel and mounted on a monoblock bench together with the control panel and a sludge transfer pump.

The tank includes inside a stirrer motor to keep the sludge in homogeneous suspension and has 6 internal supports to introduce the biomass fly ash aggregates (4: 1 ash-lime) in the form of cartridges. grating to maximize mud contact. Such cartridges or stainless steel baskets are removable by upper part and internal fixation. Fly ash from biomass is added in the form of ash-lime aggregates to increase its microstructure and porosity, stimulating adsorption and, in turn, to differentiate the granulometry range to facilitate the separation of sludge and ash at the end of the treatment.

The sludge enters the tank from the gravity thickener and is pumped at the end of the work cycle time to the sludge line, passing through the centrifuge following the normal operation of the plant.

Continuing with the normal cycle of the sludge line of a sewage treatment plant, in the centrifuge its moisture content is reduced and it is deposited in the dehydrated sludge storage hopper, from where it will be collected to be applied as compost or low impact fertilizer.

BRIEF DESCRIPTION OF THE DRAWINGS

To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, a set of drawings is attached as an integral part of said description, where, with an illustrative and non-limiting nature, the following has been represented following:

Figure 1.- Shows a top cross-sectional view of the device of the invention.

Figure 2.- Shows a front view of the device of the invention including the control panel.

Figure 3.- Shows a side view of the device of the invention.

Figure 4.- Shows a side view of the device of the invention.

Figure 5.- Shows a lateral and upper cross-sectional view of the cartridge.

PREFERRED EMBODIMENT OF THE INVENTION

In view of the aforementioned figures, and in accordance with the numbering adopted, an example of a preferred embodiment of the invention can be seen in them, which comprises the parts and elements that are indicated and described in detail below. continuation. Thus, as seen in Figures 1-4, a possible preferred embodiment of the device comprises the mechanical characteristics indicated below: The upper loading of sludge (1) is carried out with a motorized valve. Inside the tank, the six units or cartridges (2) are anchored to each other and to the tank. Such cartridges are stainless steel baskets where the ash-lime aggregates are introduced. The same tank also includes an agitator (4) and a lower propeller with two directions of rotation, clockwise and counterclockwise, and a speed selector. The sludge outlet once processed would take place by suction through a lower cone in the tank with a threaded flange (5). For the transfer of the decontaminated sludge there is a transfer pump (6). A filter (8) during the transfer prevents solid bodies from affecting the correct operation of the pump. In this phase, the system also includes a manual safety and filter cleaning handle key (9). The lower sludge discharge with motorized valve (7) is coupled to the transfer pump.

With regard to electrical command and control, the device has an electrical cabinet (12) ready to receive an electrical connection with force outputs, protected by thermal and differential to pump and motor, programmable automaton and multifunction display, with the following capabilities:

-Maximum level filling control probe with overflow level alarm (13).

-Minimum level filling control probe (14).

-Ph control probe with information visible on screen (15).

-Temperature probe with information visible on the screen (16).

-Timer clock with cycle counter visible on screen (17).

-Control opening-closing filling valve manual and automatic mode (18).

-Control opening-closing drain valve manual and automatic mode (19).

-Start-stop transfer pump manual and automatic mode (20).

-Start-stop stirrer, manual and automatic mode, control of rpm and direction of rotation of the stirring motor (21).

-Acometida electric 450 / 750V (22).

Figure 5 shows the detail of the structure of the cartridge containing the fly ash aggregates used inside the tank. This cylindrical basket comprises a galvanized steel mesh (1) that prevents the adsorbent material from escaping to the outside.

To better support the weight of the structure as a whole, the structure has plate reinforcement rings also in galvanized steel (2). The cartridges inside the tank would be kept properly closed with a lid made of the same steel mesh with wing nuts and hexagonal closing nut (3). Since the extraction of the cartridges after the treatment with the sludge is manual, some steel tube handles have been placed for an adequate grip (4) (on an industrial scale it could be done with a hoist, but it also needs fasteners to raise it). Finally, to insert each cartridge inside the tank, they have a support rod in a tank cone.

At the industrial exploitation level, this system not only allows to manage in a sustainable way the levels of pollutants in water and sludge in sewage treatment plants, but also allows a subsequent application of these sludge as fertilizers and fly ash aggregates to form part of waste materials. greener construction.

Claims (6)

1. Agitation tank for sludge and / or wastewater comprising a series of cartridges where the adsorbent material for heavy metals and / or organic pollutants is incorporated. 2. Device according to claim 1 comprising inside a stirrer motor to keep the suspension homogeneous preventing settling. 3. Device according to claim 1 comprising cartridges or baskets removable at the top and internal fixation with mesh lattice to keep the adsorbent material from the suspension separate. 4. Device according to claim 1 comprising a suction pump for the extraction of the treated sludge and / or wastewater. 5. Device according to claim 1 characterized in that it allows its handling through an electrical control panel. The system comprises an electrical cabinet (12) with force outputs, protected by thermal and differential pump and motor, programmable automaton and multifunction display. 6. Device according to claim 1, characterized in that it allows eliminating unpleasant odors from sludge and / or waste water.