This method can obtain the optimum coagulant,shoot the optimum adding amount,design the best flocculates time through jar test,and utilize orthogonal experiment to seek the best energy consumption allocative decision at different levels.

This text has proposed the optimization method to coagulation G and T design;receives the optimum coagulant and shoots the adding amount and optimum design and flocculation time bestly through the jar test;and utilize and hand in the test and seek to make the best G and T decision under the multifactor different levels.

The coagulation-flocculation jar test and a serious coagulants, such as the family of aluminum, iron and organic macromolecule were adopted in this test to examine the effects of removing impurity, including turbid, CODcr, and surfactants.

Comparisons between the said model test and the beaker test using mechanical agitation were made and the test results were analyzed to find the advantages and disadvantages of each of the two types of agitation methods.

By means of static beaker test and dynamic simulation test, the effects of Al 2(SO 4) 3, PAC, PHS and HPAM of treating simulated wastewater are evaluated.

Through a large number of beaker tests,we have compared their purifying effects and economic worth,and bioflocculation is better.

Circular jar test was carried out by applying orthogonal test approach to obtain the optimal and sub-optimal conditions and the coagulation effect was compared under the two conditions.