Liquid purification or separation – Processes – Chemical treatment
Patent
1996-11-08
1999-10-26
Hruskoci, Peter A.
Liquid purification or separation
Processes
Chemical treatment
422 28, 422 32, 210752, C02F 150, C02F 1100
Patent
active
059722274
DESCRIPTION:
BRIEF SUMMARY
1. FIELD OF INVENTION
The invention disclosed herein relates generally to the field of treating sludges which are formed as a by-product of waste stream comprised of organic wastes, sometimes referred to as organic waste sludges. Typically deposited as a sediment, such sludges are typically comprised of precipitated organic solids and 50-80 percent, by weight, moisture content. Such sludges are typically in the form of a wet, cohesive, semi-plastic, odoriferous mass. By reason of their biological origin, such sludges are usually inoculated with a variety of pathogenic organisms, including pathogenic bacteria and helminth ova. Due to the high organic content and moisture of such sludges, pathogenic bacteria and helminth ova typically flourish therein, thereby presenting biological hazards to human, animal and plant life coming into contact with such sludges. Such sludges also tend to attract numerous vectors (animals such as insects, rodents and birds) which tend to directly and indirectly spread the hazards of the sludges beyond the point of collection or disposal. Accordingly non-disinfected, raw organic waste sludges are not only disagreeable to handle, but are difficult to safely transport, dispose of or beneficially reuse.
On the other hand the high organic and nitrogen content of such sludges makes them ideal for recycling as a nutricious planting medium, providing they could be disinfected without substantially depleting their nitrogen content. Accordingly, the invention set forth herein provides a process for extermination of pathogenic bacteria and helminth ova in organic waste sludges without substantially depleting the nitrogen content of such sludges.
2. DESCRIPTION OF RELATED ART
Organic waste sludges are an inevitable by-product of waste streams containing biological matter, such as municipal and private waste treatment plants, feed lot operations, sawmills, paper mills, slaughtering operations and other operations wherein wastes of organic origin collect as a consequence of principal operations being conducted. Such sludges typically form as a waste stream sediment comprised of precipitated matter of biological origin and water; existing in the form of an odoriferous, vector attracting, wet, cohesive mass. As a consequence of their biological origin such sludges are frequently contaminated with pathological bacteria and helminth ova. Accordingly, non-disinfected organic waste sludges are typically hazardous to human, animal and plant life, are foul smelling, have physical characteristics which make them difficult to handle and transport, and, are attractive to numerous vectors which tend to spread the hazards of the sludge beyond the point of their collection or disposal.
In an effort to deal with the substantial problem of pathogens in organic waste sludges, a number of methods have been developed. Many of the presently used methods are set forth in United States Code, 40 CFR Part 257. These include aerobic digestion, anaerobic digestion, lime stabilization, air drying, composting, heat drying, heat treatment, gamma irradiation, electron irradiation and other methods shown on Table 6-1 of said regulation.
In addition, U.S. Pat. Nos. 5,281,341 and 4,793,927 to Reimer discloses methods for disinfection of an organic waste sludge with nitrous acid or ammonia. U.S. Pat. No. 3,942,970 to O'Donnell discloses a method for disinfecting organic waste sludge with N-methylol-urea solution and then reacting the methylol solution with an acid.
All of the previously known methods for disinfection of organic waste sludges involve one or more of the following disadvantages: facility, may leave substantial chemical residue and/or
The invention disclosed herein substantially reduces the aforesaid disadvantages by providing a simple, fast and effective method for disinfection of organic waste sludges; with inexpensive chemicals and equipment which may be portable, without substantial reduction of the nitrogen content of the sludge and without leaving substantial chemical residue.
While various solutions wh
REFERENCES:
patent: 3942970 (1976-03-01), O'Donnell
patent: 4067896 (1978-01-01), Pierce
patent: 4509696 (1985-04-01), Donaldson
patent: 4729831 (1988-03-01), Fujino
patent: 4935447 (1990-06-01), Philips et al.
patent: 5077314 (1991-12-01), Philips et al.
Mayeux, Sr. Eddie P.
Peltier, Jr. Morris
Hruskoci Peter A.
Lambert Jesse D.
Lemoine, Jr. Joseph L.
Morrison Betsey J.
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