T. Sankai et al., TREATMENT OF DOMESTIC WASTE-WATER MIXED WITH CRUSHED GARBAGE AND GARBAGE WASHING WATER BY ADVANCED GAPPEI-SHORI JOHKASO, Water science and technology, 36(12), 1997, pp. 175-182
Citations number
5
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
By using an advanced anaerobic filter-contact aeration Gappei-shori Jo
hkaso (AFAJ), a small-scale wastewater unit used in Japan, experiments
of the treatment of the wastewater mixed with domestic wastewater and
disposer wastewater which came from washing water of crushed garbage
by disposer were made. After the introduction of disposer wastewater i
nto domestic wastewater, BOD, TN and SS loads increased to 1.7 times,
1.1 times and 1.7 times, respectively. Results showed that in the 5-pe
rson-use type AFAJ, no remarkable decrease appeared to the BOD and SS
removal efficiencies after introduction of disposer wastewater into do
mestic wastewater, however, TN removal efficiency decreased significan
tly. As a result, effluent BOD and TN concentrations were much higher
than 20 mg.1(-1). On the other hand, the 7-person-use type AFAJ, whose
volume was 35% bigger than that of the 5-person-use type AFAJ, could
treat the above wastewater to be less than 20, 10 and 20 mg.1(-1), res
pectively. In addition, it was shown that not many changes took place
in the kinds and occurrence frequencies of protozoa and metazoa after
the addition of the disposer wastewater, which suggested that the addi
tion of disposer wastewater had increased the BOD and SS loads while i
t did not lead to much change in the component of the domestic wastewa
ter. (C) 1997 IAWQ.