The performance comparison of SPFS and PAC |
||||
Item |
SPFS |
PAC |
Remark |
|
flocculant |
iron salt |
aluminum salt |
||
coagulant |
purifying agent |
water treatment agent |
GB |
|
production method |
name |
one step |
common liquid phase immerse select method |
|
characteristic |
easy, low cost, no pollution, high production efficiency |
complicated, high cost, pollution, low efficiency |
||
corrosiveness |
small |
big |
||
materials |
copperas water treatment agent |
aluminum |
||
properties |
steadiness,no bad in long time |
common stability,alid period is 6 months |
106 times |
|
solubility |
good |
no bad |
||
solution |
red brown transparent |
lemon yellow turbid |
||
application PH |
4--11,best 6--9 |
5--7.5,best 6.7--8.0 |
||
If the temperature <4ˇăC |
good effect |
bad |
||
corrosiveness |
small |
corrosiveness |
||
alum flower |
large SG, fast settlement |
smalll SG, slow settlement |
||
flocculus hydroxide |
Ksp=10-39 |
Ksp=10-33 |
||
color light |
red brown |
achromatic or lemon yellow |
||
ion water phase metastasis |
no |
increase 1--2 times |
||
ratio of ion theoretical metastasis |
1 |
106 |
||
water mechanics conditions |
increase strength |
high strength |
||
the effect of purify body |
excellent |
good |
||
toxicity experiment |
no |
toxicity |
||
muddy reducing ratio |
99.6% |
96% |
||
decolor ratio |
>90% |
60% |
||
remove rate of COD |
>90% |
50% |
||
deodorization effect |
clear |
no clear |
||
remove rate of bacteria |
98.89% |
no clear |
||
remove rate of iron |
96.49% |
no |
||
remove rate of hardness |
15.31% |
no |
||
remove rate of chloride |
50% |
increase |
||
remove rate of fluoride |
91.67% |
noof |
||
remove rate of ammonia nitrogen |
57.14% |
no clear |
||
remove rate of zinc |
41.67% |
no |
||
comprehensive effect |
increase water quality,lower cost |
two sequence pollution,high cost |
||