and nitrogen waste liquid containing organochlorine compounds such as tetrachloroethylene etc excretive drain water from a piggery containing organonitrogen compounds at a high level waste liquid containing heavy metals such as lead hexavalent chromium cadmium and the like drain water from dairy product plants fishery processing plants slaughterhouses etc which contains water soluble protein at a high level drain water from pulp plants photo developing waste liquid car wash drain water containing a mixture of car polishing wax and detergent and the like by the use of porous ceramics provided with amorphous pore surfaces porous ceramics provided with amorphous pore surfaces are prepared by mixing clay a pore forming material and water molding into an arbitrary shape followed by drying heating up an molded article thus dried heating up an article temperature from normal temperature to 600 to 800 u00b0 c over a time period of 5 to 15 hours maintaining this temperature for 3 to 7 hours and then calcinating at 1 200 to 1 500 u00b0 c application_number US 51621400 A description the present invention will be detailed in the following examples however it should be understood that the present invention is not restricted by the examples each part used in the examples refers to part by weight as already noted fig1 is a diagrammatic illustration.