Method of sludge recycling

#1. Field of the Invention

#The present invention relates to a method of effectively recycling sludge discharged in a large volume and an apparatus therefor.

#2. Description of the Related Art

#In the accompanying drawings:

#FIG. 1 is a diagram explaining a structure of a sludge degradation promoting layer;

#FIG. 2 Is a diagram of a community wastewater treatment system employing a conformation of placing a sludge reduction tank and a recycled water producing tank at a same site; and

#The present invention provides a method of sludge recycling including the steps of: bringing sludge into contact with a sludge degrading agent containing, an active ingredient, microorganisms containing an actinomyces belonging to Streptomyces; degrading the sludge; separating the degraded sludge into a solid content and a liquid content; and producing recycled water from the liquid content.

#Sludge to which a method of the present invention is applied is not particularly limited as long as the sludge contains an organic substance, and examples of the sludge may include sludge or excess sludge discharged from a public sewage treatment plant, a night-soil treatment plant, a rural community wastewater treatment plant, or the like.

#A sludge degrading agent used in the present invention contains, as an active ingredient, microorganisms containing an actinomyces belonging to Streptomyces and has a function of strongly degrading an organic substance in the sludge when coming in contact with the sludge. The actinomyces belonging to Streptomyces exists in a state of a spore in sludge and can proliferate vitally by extending hypha while degrading an organic substance strongly. These actinomyces belonging to Streptomyces desirably account for 5 to 50% of the sludge degrading agent. Microorganisms containing actinomyces belonging to Streptomyces have only to exist (as microorganisms in the sludge degrading agent), but preferably contains together other aerobic bacteria and anaerobic bacteria. For example, as an actinomyces, Thermoactinomyces or Nocardia may be included in the microorganisms. As aerobic bacteria, Pseudomonas aeruginosa, Comamonas, Sphingomonas, or Acinetobacter may be included in the microorganisms. Furthermore, as others, Nitrosomonas, Nitrobacter, Thiobacter, Azotobacter, or the like may be included in the microorganisms.