Recycling automotive phosphate rinse water stream

An apparatus for treating water containing phosphate, comprising:

• a process water line and an ultrafiltration unit in series with the process water line;
• a sample process water line connected to the process water line by a first control valve in fluid communication with the process water line;
• a dilution line including a second control valve in fluid communication with the sample process water line, wherein the sample process water line and the dilution line each comprise a flow meter;
• a diluted process water line in fluid communication with the sample process water line, dilution line, and a phosphate analyzer located downstream of the diluted process water line;
• a chemical additive feed line connected to the process water line downstream from the sample process water line to inject a phosphate control additive into the process water line;
• and
• an effluent holding tank downstream of the phosphate analyzer, wherein waste water from the phosphate analyzer is directed to the effluent holding tank;
• wherein process water in the process water line passes through the ultrafiltration unit after the sample process water line, and wherein the chemical additive line is connected to the process water line upstream of the ultrafiltration unit.