Firstly, I want to ask is ...

Firstly, I want to ask is there any water reused standard in Venezuela? If yes, you should obey the standard. If no, we could discuss this issue in SECOUNDLY. Secoundly, irrigation water quality is based on several factors, such as COD, BOD, pH, heavy metals and so on. So only one or two characteristic (COD and BOD) could not reflect the real quality of this treated water. Meanwhile, the effluent COD concentration is around 800mg/L, and the color is dark, in my experience, this effluent can`t be used for irrigation, because in my country (China), this effluent can`t be considered as TREATED WATER. The contamination concentration is too high! Further treatment is required, then you could consider the reuse matter.