活性スラッジによる産業廃水の処理に関する研究 : (第10報)パルプ廃水の処理について

概要

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The activated sludge treatment of sulfite, kraft, semi-chemical (soda and ammonia bases), groud, chemi-ground, straw pulps and paper machine wastes were investigated.When the wastes were treated with the various concentration under 5,000 ppm as BOD, the purification rates were not related to the raw waste concentrations.The BOD removal percentages of the wastes were in the range of 60 to 90%. and suspended solids were removed almost perfectly.It was found that the maximum BOD loadings of the wastes were about 4 kg/m^3/day. If the loadings increased beyond these limits, the sludges cause bulking, and the function of purification decreases.With the addition of proper quantities of organic or inorganic nutrients, the treatment efficiencies rose remarkably. Even though the BOD loadings were of 5 to 6 kg/m^3/day, the sludges remained normal, and the BOD removals were at least more than 90%.The treatment efficiencies of the wastes decreased suddenly in conformity to the fall of temperature. However, it was able to recovered with the addition of the nutrients.The amounts of the sludges produced during the purification processes were nearly the sum of the total suspended solids and 25% of total BOD of the wastes treated.
社団法人日本生物工学会の論文
1966-07-25