Bentazon containing wastewater treatment

A process for treating alkaline wastewater containing 3-isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide (bentazon) comprising: adjusting the pH of said wastewater to a value of about 0.2 to a value less than 7, then heating to a temperature of at least about 60.degree. C. and a pressure of from 0 to 500 psig for a period of from about five minutes to 50 hours, to decompose said bentazon and reduce the bentazon content of said wastewater.

A process for treating alkaline wastewater containing 3-isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide (bentazon) whereby said bentazon is decomposed comprising: incorporating a mineral acid in said wastewater in an amount sufficient to adjust the pH to a value of about 0.2 to a value less than 7; supplying said wastewater to a reactor through a conduit; heating the wastewater in said reactor to a temperature of from about 60.degree. to 200.degree. C.; reacting said wastewater in said reactor for a period of from about one to six hours at a pressure of from about 1 to 400 psig; discharging from the reactor an effluent having a bentazon content of less than about 15 ppm; and neutralizing said effluent with a base.