||Activated Sludge Treatment of Chrome Tannery Wastes.
||Lawrence (A. C.) Leather Co., South Paris, Maine.
||WP-Ord-5; WPRD-133-01-68; FWPCA-12120; 12120-09/69,; 00163
( Wastes(Industrial) ;
( Water pollution ;
( Tanning ;
Pilot plants ;
Sanitary engineering ;
Activated sludge process ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
A waste treatment process was developed and tested, in pilot plant scale, for the treatment of the tannery wastes in combination with municipal sewage. The process consisted of the following steps in the order employed; equalizing and mixing of the alkaline and acid wastes; primary sedimentation; carbonation followed by upflow sedimentation; addition of screened municipal sewage activated sludge treatment and secondary sedimentation of the mixed wastes; and chlorination. The sludges resulting from the treatment of the wastes and sewage were dewatered by centrifuge and were found to be suitable for burial. Design factors for the various steps of the process were developed and are presented in the attached report. Studies were made of the fundamental systems and reactions which form the bases for the processes employed in the pilot plant. (Author)