METHOD FOR THE TREATMENT OF THE SEWAGES AND RESPECTIVE PLANT

Abstract: A method for zootechnical sewages treatment and respective plant, characterized in that it provides the introduction in the sewage a solid material having the following characteristics: are in solid geometric shape; are floating in the respective sewage; are biodegradable; include at least resins with formaldehyde and ferrous sulfate with controlled cession.

Description: DESCRIPTION Method for the treatment of the sewages and respective plant Technical Field My invention relates to a method for the zootechnical sewages treatment and respective plant. The treatment carried out with the method concerning this patent is finalized to the neutralization of the free ammonia and also to the partial deodorization of the sewage and rebate of the respective PH to favour the activity of the responsible microbes of the seasoning process of the sewage. For information exists in commerce iron fertilizers having the following composition: total Nitrogen 12,5%, iron sulfate 24% ; total nitrogen 20%, phosphoric anhydride 5%, potassium oxide 5%, magnesium oxide 2%, iron sulfate 2%. Conveniently the floating material incorporates tartaric acid and citric acid, to reduce the PH of the sewage and favour the activity of the decomposers microbes. Further advantages are: - possibility to incorporate bacterial and/or enzymatic mixes ; - possibility to incorporate disinfectants with urea formaldehyde ratio of 1:1,5; - possibility to precipitate the contained ammonia in the sewage under sulfate iron form of ammonia alternatively to the strippage by means of air introduction. If this solution provides a lot of advantages, of practicality in use, practicalness in work and cleanness of the breeding, and also easy conveyance and downflow of the excrements of the breeding through respective and progressive incorporation in the underlying sewage basins separate from said grill, it creates pollution and toxic problems both for the operators and animals obliged to respire the sewage exhalations. To obviate said problems aeration systems have supplied and in particular under grill aspiration systems of the toxic vapors, while the fresh air immission is supplied by under roof openings. These solutions do not solve however the problem of the pollution of the atmospheric environment surrounding, consequently has been experimented progressive sewage treatment systems in order to contain the noxious exhalations and to neutralize at maximum the free ammonia and the sulphurated hydrogen. It is known however that the zootechnical sewages storage in conditions of anaerobiosis in external basins et/or under said breeding grill paving, generates ammonia vapors and troublesome odors. Such drawback and pollution is accentuated during diffusion of the sewages on the rural zones. The diffusion of ammonia and hydrogen sulphurated vapors inside breedings, in particular in those endowed with said basins under the animals, causes also stress in the animals with consequent reduction of the animal performance life. • The ammonia presence inside breedings, in particular during cold season, makes often necessary a constant and important air exchange by means of forced ventilation with consequent dangerous air current for the animals and high electric energy costs for further heating. 1 The relative problems to the ammonia vapors emission and 2 troublesome odors caused in stored zootechnical sewages anaerobic 3 condition have been affronted in different way: 4 - use of bacterial mixes and enzymes , 5 - use of electrolytic copper dissolution in the sewage ( EP 0103345 in 6 the name Huller Wolfgang ); 7 - use of electrolytic ions sulfate dissolution, phosphate coupled with 8 oxidant potassium permanganate ( IT 83344A/89 in the name of the 9 same applicant ). I 0 The bacterial and/or enzymatic mixes use have high cost and I I do not allows to obtain adequate results needed by breeders. 1 2 The based treatment method on the electrolytic copper 1 3 dissolution ( P 0103345 / IT 83344A/89 ) in the sewage give good 1 4 results only using high electrolytic copper dissolution dosage. 1 5 This reduce the lifetime of treated sewage. 1 6 Furthermore copper cause toxicity and inhibitor action of the 1 7 bacterial and microbic flora and constitutes a pollution danger for 8 underground water. 9 The treatment method, object of the Patent Application IT 0 83344A/89 is resulted too expensive and the benefits has not been so 1 important. Be noted that the electrolytic dissociation of the salts 2 contained in the sewage generates irritating gas. 3 . Both the aforementioned solutions require the installation of 4 a power comsumption electric apparatus that causes breakdowns 5 during rainstorms by electric discharges. 6 7 The innovative idea according to present invention is to 8 provide the gradual diffusion of a reagent liberated from a water insoluble solid body slowly biodegradable without electric currents use or galvanic systems notoriously expensive and dangerous. The exposed problems are solved as claimed by means of a method that provides the introduction of solid bodies in the sewage ( blocks, or slabs or other convenient solid form ) characterized by the presence of the following combination of characteristics: - said solid bodies are floating in the sewage; - said solid bodies are made with synthetic resins containing at least formaldehyde and ferrous sulfate with controlled ion cession. Advantageously the resin is of the type of ion cession as urea- formaldehyde or phenol-formaldehyde or melamin-urea- formaldehyde. The blocks preferably plate shape are reinforced with wood fiber, sawdust, wood chips, acid peat, strawy or cellulose fragment fibers. The blocks are insoluble in water but slowly biodegradable and have the property to float and floating on the sewage surface after few hours from introduction in the sewage and still floats until the complete cession of the ferrous sulfate contained in them. The climbing floating Archimede push is determined substantially by the activation of the action of said ion cession that forming bubble gas reduces substantially its specific weight. • The biodegradability of the blocks is an important characteristic avoiding problems of sedimentation. The ferrous gradual sulfate diffusion in the superficial stratum of the sewage supplies a neutralization process of the free ammonia with formation of ammonia-ferro-sulfate FeU ( NH4)2 ( SO4)2. This treatment, solve the problems relative to the high costs and the poor reliability of the treatment methods till now used, allows to improve the fertilizing power of the sewages and supply a good deodorization of the environment. For information exists in commerce iron fertilizers having the following composition: total Nitrogen 12,5%, iron sulfate 24% ; total nitrogen 20%, phosphoric anhydride 5%, potassium oxide 5%, magnesium oxide 2%, iron sulfate 2%. Conveniently the floating material incorporates tartaric acid and citric acid, to reduce the PH of the sewage and favour the activity of the decomposers microbes. Further advantages are: - possibility to incorporate bacterial and/or enzymatic mixes ; - possibility to incorporate disinfectants with urea formaldehyde ratio of 1:1,5; - possibility to precipitate the contained ammonia in the sewage under sulfate iron form of ammonia alternatively to the strippage by means of air introduction. p. The applicant Dr.G.D'Agostini

Claims: Claims 1. A method for zootechnical sewages treatment and respective plant, characterized in that it provide the introduction in the sewage a solid material having the following characteristics: - are in solid geometric shape; - are floating in the respective sewage; - are biodegradable; - include at least resins with formaldehyde and ferrous sulfate with controlled cession. 2. A method and plant according to claim 1, characterized in that said resin is of the type of ion cession, able to disperse ions to the sewage in controlled way. 3. A method and plant according to claim 1, characterized in that said resin is of the type of urea-formaldehyde. 4. A method and plant according to claim 1, characterized in that said resin is of the type of phenol-formaldehyde. 5. A method and plant according to claim 1, characterized in that said resin is of the type of melamin-urea-formaldehyde. 6. A method and plant according to claim 1, characterized in that said floating bodies have reinforced with vegetal fibers. 7. Method and plant according to claim 1, characterized in that said floating bodies are reinforced with wood fiber. 8. A method and plant according to claim 1 , characterized in that said floating bodies are reinforced with wood fiber under sawdust form and/or wood-chips. 9. A method and plant according to claim 1, characterized in that said floating bodies are reinforced with acid peat. 10. A method and plant according to claim 1 , characterized in that said floating bodies are reinforced with cellulosic substances. 11. A method according to claim 1, in which one provides the use of a chemical treatment of the zootechnical sewages by means of diffusion of ferrous sulfate liberated gradually from said block/s made with urea-formaldehyde resin having a molar ratio between 1:1,1 and 1:1,5. 12. A method according to claim 1., characterized in that said floating material incorporates potassium permanganate, perphosphate and potassium nitrate. 13. A method according to claim 1., characterized in that said floating material incorporates potassium perphosphate. 14. A method according to claim 1., characterized in that said floating material incorporates potassium nitrate. 15. A method according to claim 1., characterized in that said floating material incorporates organic acids. 16. A method according to claim 1., characterized in that said floating material incorporates citric acid. 17. A method according to claim 1., characterized in that said floating material incorporates tartaric acid. 18. .A method according to claim 1., characterized in that said floating material incorporates bacterial mixes. 19. A method according to claim 1., characterized in that said floating material incorporates enzymatic mixes. 20. A method according to claim 1., characterized in that said floating material incorporates disinfectants substances and said resin have a molar urea formaldehyde ratio between 1:1,1 and 1:1,5.

Inventors: TABOGA LEANDRO, TABOGA, LEANDRO
Applicants: TABOGA LEANDRO, TABOGA, LEANDRO
Application year: 1992
Main classification: C02F1
IPC codes: C02F1, C02F3, C05F3