Methods and apparatus for efficient implementation and control of water treatment bypass loops combining ozone and chlorine injection are disclosed. An LED array comprises blue light in a band between about 350 nm and 550 nm, red light in a band at about 630 nm and dark red light in a band at about 660 nm. The process may be integrated with an ethyl acetate production process, such as esterification, hydrogenation, or dehydrogenation.