WO2013007847A1 - System for treating slurries by means of electrocoagulation and electrooxidation - Google Patents

System for treating slurries by means of electrocoagulation and electrooxidation Download PDF

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Publication number
WO2013007847A1
WO2013007847A1 PCT/ES2012/070466 ES2012070466W WO2013007847A1 WO 2013007847 A1 WO2013007847 A1 WO 2013007847A1 ES 2012070466 W ES2012070466 W ES 2012070466W WO 2013007847 A1 WO2013007847 A1 WO 2013007847A1
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WIPO (PCT)
Prior art keywords
sludge
water
slurry
sent
liquid
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PCT/ES2012/070466
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Spanish (es)
French (fr)
Inventor
Jesús LONGARES VALERO
Pilar LONGARES VALERO
J. Ignacio LONGARES VALERO
Francisco LONGARES VALERO
Original Assignee
Longares Valero Jesus
Longares Valero Pilar
Longares Valero J Ignacio
Longares Valero Francisco
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Priority to ESP201131192 priority Critical
Priority to ES201131192A priority patent/ES2395664B1/en
Application filed by Longares Valero Jesus, Longares Valero Pilar, Longares Valero J Ignacio, Longares Valero Francisco filed Critical Longares Valero Jesus
Publication of WO2013007847A1 publication Critical patent/WO2013007847A1/en

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01CPLANTING; SOWING; FERTILISING
    • A01C3/00Treating manure; Manuring
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • CCHEMISTRY; METALLURGY
    • C05FERTILISERS; MANUFACTURE THEREOF
    • C05FORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F3/00Fertilisers from human or animal excrements, e.g. manure
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/463Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/20Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/141Feedstock
    • Y02P20/145Feedstock the feedstock being materials of biological origin

Abstract

The invention relates to a system that consists of pumping the slurry from conventional storage ponds at pig facilities or farms toward a separator of solids and liquids, obtaining a solid that can be used as fertilizer and a liquid phase that is subjected to a flocculation process, wherein the muds obtained in said process are passed through a filter-press and the liquid is conveyed to an electrocoagulation apparatus, where the water undergoes electrolysis, the same apparatus separating floating sludge, precipitated sludge and clarified water. Said water is suitable for irrigation, since it contains a natural fertilizer; the floating sludge is conveyed to the filter-press; and the clarified water not used for irrigation is conveyed to a tank for further treatment in the subsequent phase. The fluid is subjected to a process of electrooxidation, filtering and finally a process of osmosis to separate the salts and the remaining impurities from the water and thus obtain a completely clean liquid.

Description

SISTEMA DE TRATAMIENTO DE PURINES MEDIANTE ELECTROCOAGULACION Y ELECTRQXIDACIQN  PURINE TREATMENT SYSTEM THROUGH ELECTROCOAGULATION AND ELECTRQXIDACIQN
D E S C R I P C I O N D E S C R I P C I O N
OBJETO DE LA INVENCION OBJECT OF THE INVENTION
La presente invención se refiere a un sistema de eliminación de purines con aprovechamiento del agua resultante, cuya evidente finalidad es la de realizar un tratamiento de los purines generados en las granjas de porcinos y conseguir la eliminación de las impurezas, para convertir el purín original en un abono o fertilizante para las tierras y poder aprovechar el agua resultante, mediante equipos apropiados, para riego, limpieza y vertido. The present invention relates to a slurry disposal system with use of the resulting water, whose obvious purpose is to perform a treatment of the slurries generated in pig farms and achieve the removal of impurities, to convert the original slurry into a fertilizer or fertilizer for the lands and to be able to take advantage of the resulting water, through appropriate equipment, for irrigation, cleaning and dumping.
ANTECEDENTES DE LA INVENCIÓN BACKGROUND OF THE INVENTION
Como es sabido, los purines son la mezcla de heces, orines y del agua de lavado de los boxes o cochiqueras que se utilizan en granjas de porcinos, siendo obligatoria la existencia de una balsa de purines, hasta la que son canalizados éstos desde los diferentes puntos en los que se generan, de manera que la capacidad de la balsa será la adecuada en función del número de animales de la granja, para efectuar un vaciado periódico suficientemente distanciado en el tiempo. As is known, slurries are the mixture of feces, urine and washing water of the boxes or cochiqueras that are used in pig farms, being mandatory the existence of a slurry raft, to which they are channeled from the different points at which they are generated, so that the capacity of the raft will be adequate depending on the number of animals on the farm, to carry out a periodic emptying sufficiently distant in time.
En el tratamiento y eliminación de purines se consigue obtener abonos mediante los que se rocían los campos con la colaboración de una cisterna arrastrada por un tractor, lo que obliga a disponer de gran cantidad de suelo para dosificar convenientemente el purín, obligando además a que dicho suelo esté disponible en el momento en el que hay que hacer el vaciado de la balsa. In the treatment and elimination of slurry, fertilizers are obtained by means of which the fields are sprayed with the collaboration of a cistern carried by a tractor, which requires a large amount of soil to conveniently dose the slurry, also forcing This floor is available at the moment in which the emptying of the raft must be done.
DESCRIPCIÓN DE LA INVENCIÓN DESCRIPTION OF THE INVENTION
El sistema que se preconiza se basa en un proceso de tratamiento de purines, iniciándose el tratamiento con el bombeo de los purines desde la correspondiente balsa de almacenamiento de la propia granja, constantemente en agitación mediante un agitador para mantener el purín homogeneizado conduciéndolo hasta un separador filtro prensa de sólidos-líquidos, obteniéndose un sólido con un 25-35% de humedad y un efluente con partículas entre 0,5-0,2 mm, según tamiz, el sólido obtenido entorno al 10% es utilizado como componente en la fabricación de compost y abonos solidos, enviándose a una zona de almacenaje de sólidos, efectuándose finalmente con esos sólidos una fase de secado en caso de que fuera preciso, pudiéndose realizar dicho secado de forma natural al aire libre o mediante aire forzado (método aerobico). The system that is recommended is based on a process of treatment of slurry, starting the treatment with the pumping of slurry from the corresponding storage raft of the farm itself, constantly under stirring by means of an agitator to keep the homogenate slurry leading to a separator solid-liquid press filter, obtaining a solid with 25-35% humidity and an effluent with particles between 0.5-0.2 mm, according to sieve, the solid obtained around 10% is used as a component in manufacturing of compost and solid fertilizers, being sent to a solids storage area, finally carrying out with those solids a drying phase if necessary, being able to perform said drying naturally outdoors or by forced air (aerobic method).
Por su parte, el purín líquido obtenido en el separador, es sometido a un proceso físico-quimico de coagulación-floculación - mediante un equipo de flotación DAF , donde por medio de micro burbujas de aire disuelto se hacen flotar los flóculos obtenidos a la superficie del tanque siendo retirados los lodos formados mediante un sistema de rasquetas móviles. En dicho proceso de coagulación-floculación - se inyecta a la entrada del equipo DAF el coagulante sintético en un mezclador purin/coagulante para la mezcla continua y homogénea del purín con el coagulante. Dicho coagulante no modifica ni PH, ni el contenido en cloruros del resultado final. On the other hand, the liquid slurry obtained in the separator is subjected to a physical-chemical coagulation-flocculation process - by means of a DAF flotation device, where the floats obtained are floated to the surface by means of micro bubbles of dissolved air. The sludge formed by a mobile scraper system is removed from the tank. In said coagulation-flocculation process - the synthetic coagulant is injected at the entrance of the DAF equipment into a purin / coagulant mixer for continuous and homogeneous mixing of the slurry with the coagulant. Said coagulant does not modify neither PH nor the chloride content of the final result.
El efluente debidamente coagulado pasa al reactor de floculación donde se dosifica el floculante (copolimero cationico de acrilamida en dispersión acuosa) tipo cationico de baja ionicidad y con peso molecular alto. En este reactor es agitado lentamente a bajas revoluciones para la formación de los floculos y conducido al tanque de flotación por aire disuelto, donde se obtiene un clarificado y un lodo, este lodo es trasvasado a un filtro prensa para su deshidratacion, siendo mezclados con los sólidos obtenidos en el proceso de separación sólido-líquido. The duly coagulated effluent passes to the flocculation reactor where the flocculant is dosed (cationic acrylamide copolymer in aqueous dispersion) cationic type of low ionicity and high molecular weight. In this reactor it is slowly stirred at low revolutions for the formation of the flocculation and taken to the flotation tank by dissolved air, where a clarified and a sludge is obtained, this sludge is transferred to a press filter for dehydration, being mixed with the solids obtained in the solid-liquid separation process.
El efluente obtenido en el tanque DAF se hace pasar por un equipo de electrocoagulación, comprendiendo este equipo tres partes bien diferenciadas, una correspondiente a lo que se denomina cabezal, formado por un ánodo y un cátodo, otra correspondiente a un sistema de separación de fangos, y otra correspondiente a un sistema de dosificación de floculante, de manera que entre el ánodo y el cátodo del equipo de electrocoagulación se hace pasar el efluente produciéndose a su paso la electrólisis del mismo siendo ésta recogida en la parte inferior del equipo mediante un embudo cónico. The effluent obtained in the DAF tank is passed through an electrocoagulation equipment, this equipment comprising three distinct parts, one corresponding to what is called a head, formed by an anode and a cathode, another corresponding to a sludge separation system , and another corresponding to a flocculant dosing system, so that the effluent is passed between the anode and the cathode of the electrocoagulation equipment, producing electrolysis of the same being collected at the bottom of the equipment by means of a funnel conical.
El agua tratada fluye hacia el sistema de separación de fangos, donde se almacena en un depósito de agua tratada y se realiza la separación entre fangos flotantes, fangos precipitados y agua clarificada, siendo los fangos flotantes retirados por rebose y conducidos al filtro prensa existente anteriormente, mientras que los fangos precipitados son vaciados, mediante una válvula automática instalada en el fondo del depósito y el agua tratada, se extrae automáticamente mediante un control de nivel electrónico. The treated water flows to the sludge separation system, where it is stored in a treated water tank and the separation between floating sludge, precipitated sludge and clarified water is performed, the floating sludge being removed by overflow and taken to the previously existing press filter. , while the precipitated sludge is emptied, by means of an automatic valve installed at the bottom of the tank and the treated water, it is automatically extracted by means of an electronic level control.
Mediante el tratamiento electroquímico, en el que mediante una corriente eléctrica que atraviesa el fluido a tratar y con la colaboración de un ánodo de sacrificio, se generan compuestos químicos que separan o reducen o eliminan muy notablemente los sólidos, DQO ,nitrógeno, fosforo, metales pesados, etc .. En este punto de tratamiento del purín, se obtiene agua apta para limpieza o uso como fertilizante liquido, con los siguientes valores: Through electrochemical treatment, in which by means of an electric current that passes through the fluid to be treated and with the collaboration of a sacrificial anode, chemical compounds are generated that separate or significantly reduce or eliminate solids, COD, nitrogen, phosphorus, metals heavy, etc. At this point of treatment of the slurry, water suitable for cleaning or use as a liquid fertilizer is obtained, with the following values:
- Reducción ±90% del nitrógeno total. - Reduction ± 90% of total nitrogen.
- Reducción del fósforo, superior al 99%.  - Phosphorus reduction, greater than 99%.
- Reducción de metales pesados, superior al 99%.  - Heavy metal reduction, greater than 99%.
- Eliminación de virus, bacterias, parásitos, ecoli, legionela, etc. - Eliminación de pesticidas y fitosanitarios.  - Elimination of viruses, bacteria, parasites, ecoli, legionella, etc. - Elimination of pesticides and phytosanitary products.
- Eliminación de materia orgánica, olor, color, sólidos.  - Elimination of organic matter, smell, color, solids.
Este fluido es sometido a un siguiente proceso de electro- oxidación, aumentándose el pH con sosa cáustica. This fluid is subjected to a following electro-oxidation process, increasing the pH with caustic soda.
En el citado proceso de electro-oxidación, el amonio que conlleva el agua se convierte en amoniaco, produciéndose oxidación por parte de los correspondientes ánodos catalíticos, y cuya oxidación se consigue en base a peróxido de hidrógeno, ozono, hipocloritos e hidróxidos. In the aforementioned electro-oxidation process, the ammonium that the water carries is converted into ammonia, producing oxidation by the corresponding catalytic anodes, and whose oxidation is achieved based on hydrogen peroxide, ozone, hypochlorites and hydroxides.
Tras la oxidación, el nitrógeno amoniacal es convertido en nitrógeno gas y la materia orgánica soluble con desprendimiento de CO2, siendo el líquido enviado a un filtro de zeolita y carbón activo, en el que se produce la limpieza del color, pasando el líquido a ser incoloro. After oxidation, the ammoniacal nitrogen is converted into nitrogen gas and soluble organic matter with release of CO 2 , the liquid being sent to a zeolite and activated carbon filter, in which the color cleaning occurs, passing the liquid to be colorless
Por último, dicho líquido sin color es sometido a un proceso de osmosis inversa, obteniéndose por una parte las sales y el resto de impurezas que lleva al líquido, y por otra parte se obtiene agua totalmente limpia, y en donde el análisis resultante de ésta da como resultado lo siguiente: - Sólidos en suspensión 9 mg/1 Finally, said colorless liquid is subjected to a reverse osmosis process, obtaining on the one hand the salts and the rest of impurities that leads to the liquid, and on the other hand totally clean water is obtained, and where the resulting analysis of this It results in the following: - Suspended solids 9 mg / 1
- Materiales sedimentables 10 ml/1  - Sedimentable materials 10 ml / 1
- Sólidos gruesos ausentes  - Absent thick solids
- DQO 82,0 mg/1  - COD 82.0 mg / 1
- Conductividad 1.500 μ8/αη a 20°C - Conductivity 1,500 μ8 / αη at 20 ° C
- Color ausente - Absent color
- Cromo III ausente  - Chrome III absent
- Cromo IV ausente  - Chromium IV absent
- Níquel ausente  - Nickel absent
- Plomo ausente  - Absent lead
- Cobre 0,28 mg/1  - Copper 0.28 mg / 1
- Zinc 2,5 mg/1  - Zinc 2.5 mg / 1
- Sulfates 182 mg/1  - Sulfates 182 mg / 1
- Fósforo total > 2 mg/1  - Total phosphorus> 2 mg / 1
- Nitrógeno amoniacal 20 mg/1  - Ammoniacal nitrogen 20 mg / 1
- Nitrógeno nítrico 15 mg/1  - Nitric nitrogen 15 mg / 1
- Aceites y grasas ausentes  - Absent oils and fats
- Detergentes ausentes  - Absent detergents
Dicha agua obtenida es un líquido trasparente, inodoro y apto para cualquier uso. Said water obtained is a transparent liquid, odorless and suitable for any use.
DESCRIPCIÓN DE LOS DIBUJOS DESCRIPTION OF THE DRAWINGS
Para complementar la descripción que seguidamente se va a realizar y con objeto de ayudar a una mejor comprensión de las características del invento, de acuerdo con un ejemplo preferente de realización práctica del mismo, se acompaña como parte integrante de dicha descripción, un único dibujo en donde con carácter ilustrativo y no limitativo, se ha representado lo siguiente: To complement the description that will then be made and in order to help a better understanding of the features of the invention, according to a preferred example of Practical realization of the same, is accompanied as an integral part of said description, a single drawing where, for illustrative and non-limiting purposes, the following has been represented:
En la figura única mostrada en la hoja de planos referida, se representa el esquema correspondiente a un diagrama de bloques de las distintas fases del proceso de tratamiento y eliminación de purines objeto de la invención. In the unique figure shown in the referenced sheet of drawings, the scheme corresponding to a block diagram of the different phases of the process of treatment and disposal of slurry object of the invention is represented.
REALIZACIÓN PREFERENTE DE LA INVENCIÓN PREFERRED EMBODIMENT OF THE INVENTION
Como se puede ver en la figura referida, desde la correspondiente balsa de purines con que al efecto debe contar la instalación o granja de animales porcinos, los purines son bombeados a un separador o filtro prensa (1) de sólido y líquido, obteniendo por una parte sólido que es enviado a un depósito de almacenamiento (2) de sólidos. Estos sólidos (2) almacenados en el depósito correspondiente, pueden ser utilizados, tras su secado bien al aire libre o mediante procesos artificiales, para abonos y fertilizantes de tierras mientras que el líquido es enviado a un tanque de flotación - floculación (3), donde tiene lugar un proceso de floculación, con la adicción del floculante respectivo a través del correspondiente dosificador (8). La acción de este floculante hace que se genere una precipitación de lodos en suspensión, siendo estos separados del líquido y llevados al filtro prensa para que sean prensados, y los lodos llevados a la zona de almacenaje de los mismos. As can be seen in the aforementioned figure, from the corresponding slurry pool with which the pig farm or farm must have the effect, the slurries are pumped to a separator or filter press (1) of solid and liquid, obtaining by a solid part that is sent to a storage tank (2) of solids. These solids (2) stored in the corresponding deposit, can be used, after drying either outdoors or by artificial processes, for fertilizers and land fertilizers while the liquid is sent to a flotation-flocculation tank (3), where a flocculation process takes place, with the addition of the respective flocculant through the corresponding dispenser (8). The action of this flocculant causes a precipitation of sludge in suspension to be generated, these being separated from the liquid and taken to the press filter to be pressed, and the sludge taken to the storage area thereof.
El efluente obtenido es conducido a un equipo de electrocoagulación (4) en el que se establece un cabezal formado por un ánodo y un cátodo, un sistema de separación de fangos, y un sistema de dosificación de coagulante, teniendo lugar una electrólisis del agua. Esta electrólisis de los metales y las partes solidas en suspensión produce unos lodos que están en suspensión y que son llevados al filtro prensa, (1), donde se realiza precisamente el prensado y el secado de los lodos obtenidos en el proceso de electro coagulación siendo esos lodos mezclados con los sólidos obtenidos en el proceso de separación sólido-líquido. The effluent obtained is conducted to an electrocoagulation equipment (4) in which a head formed by an anode and a cathode, a sludge separation system, and a coagulant dosing system is established, taking place a water electrolysis. This electrolysis of metals and solid parts in suspension produces sludges that are in suspension and that are taken to the press filter, (1), where the pressing and drying of the sludge obtained in the electro coagulation process is carried out, being those sludge mixed with the solids obtained in the solid-liquid separation process.
El líquido obtenido del proceso de electrólisis es recogido en la parte inferior de dicho bloque o equipo de electrocoagulación (4) el agua tratada se hace pasar a un depósito (5) los fangos precipitados de la maquina de electrocoagulación son purgados, esta agua puede utilizarse como fertilizante, puesto que resulta un componente totalmente higienizado, sin olor, y con una reducción muy importante de materia orgánica. The liquid obtained from the electrolysis process is collected in the lower part of said block or electrocoagulation equipment (4) the treated water is passed to a reservoir (5) the precipitated sludges of the electrocoagulation machine are purged, this water can be used as a fertilizer, since it is a completely sanitized component, without odor, and with a very important reduction of organic matter.
Por último, el fluido resultante o agua tratada de la manera anteriormente descrita, se hace pasar a través de una etapa de electro- oxidación (6), aumentando el pH, para obtener la oxidación del amonio para su conversión en amoniaco, de manera tal que después de esa oxidación el nitrógeno amoniacal se convierte en nitrógeno gas y la materia orgánica soluble con desprendimiento de CO2, siendo el líquido enviado finalmente a una fase de filtrado (7) de zeolita-carbón activo, para producir la limpieza del color del líquido, para posteriormente ser sometido a una fase de osmosis inversa (9) para separar las sales y el resto de impurezas del líquido, respecto del agua totalmente limpia. Finally, the resulting fluid or water treated in the manner described above is passed through an electro-oxidation step (6), increasing the pH, to obtain the oxidation of ammonium for conversion into ammonia, such that after this oxidation the ammoniacal nitrogen is converted into nitrogen gas and soluble organic matter with release of CO 2 , the liquid being finally sent to a filtration phase (7) of zeolite-activated carbon, to produce the color cleaning of the liquid, to subsequently be subjected to a reverse osmosis phase (9) to separate salts and other impurities from the liquid, with respect to the completely clean water.

Claims

R E I V I N D I C A C I O N E S  R E I V I N D I C A C I O N E S
Ia.- Sistema de tratamiento de purines mediante electrocoagulación y electroxidacion, que partiendo de compuesto de purines almacenados en las correspondientes balsas establecidas al efecto en las instalaciones o granjas de porcinos, se caracteriza porque desde dicha balsa el purín es bombeado a un separador sólidos-líquidos o filtro prensa (1), en el que los sólidos que son enviados a un recipiente de almacenaje (2) para secado de los mismos al aire libre o de forma artificial para obtener abonos fertilizantes para las tierras, mientras que los líquidos son enviados a un tanque de flotación-fio culación (3), tanque en el que se generan uno lodos que son enviados al filtro-prensa (1), a partir del cual son mezclados con los sólidos procedentes del depósito de almacenaje (2), mientras que la materia líquida se hace pasar por un equipo de electrocoagulación (4) para la separación de los fangos flotantes, de los fangos precipitados y el agua clarificada que se hace pasar a un depósito (5), siendo los fangos flotantes trasvasados por decantación y traspasados al filtro prensa (1), mientras que los fangos precipitados son purgados, y el agua tratada pasa a un proceso en donde se añade sosa caustica para aumentar el pH, para pasar a una etapa de electro-oxidación (6) y producirse la oxidación mediante fuertes oxidantes, de manera que el nitrógeno amoniacal obtenido en la oxidación es convertido en nitrógeno gas y la materia orgánica soluble con desprendimiento de CO2, siendo el líquido resultante enviado a un filtro de zeolita y carbón activo (7), para finalmente someterlo a un proceso de osmosis inversa (9) para separación de las sales e impurezas respecto del agua tratada y limpia. I a .- System of treatment of slurry by electrocoagulation and electroxidation, which based on compound of slurry stored in the corresponding rafts established for this purpose in the facilities or pig farms, is characterized in that from said raft the slurry is pumped to a solid separator -liquids or filter press (1), in which the solids that are sent to a storage container (2) for drying them outdoors or artificially to obtain fertilizer fertilizers for the land, while the liquids are sent to a flotation tank fio culation (3), a tank in which one sludge is generated and sent to the filter press (1), from which they are mixed with the solids from the storage tank (2), while the liquid matter is passed through an electrocoagulation equipment (4) for the separation of floating sludge, precipitated sludge and clarified water that is passed to a reservoir (5), the floating sludge being transferred by decantation and transferred to the press filter (1), while the precipitated sludge is purged, and the treated water passes to a process where caustic soda is added to increase the pH, to go to an electro-oxidation stage (6) and oxidation occurs through strong oxidants, so that the ammoniacal nitrogen obtained in the oxidation is converted into nitrogen gas and the soluble organic matter with release of CO 2 , the resulting liquid being sent to a zeolite and activated carbon filter (7), to finally subject it to a reverse osmosis process (9) for separation of salts and impurities from treated and clean water.
PCT/ES2012/070466 2011-07-13 2012-06-22 System for treating slurries by means of electrocoagulation and electrooxidation WO2013007847A1 (en)

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