Enzymes are proteins which are readily and ultimately biodegradable in the environment  .
Apart from aquatic toxicity resulting from of the catalytic effect (protein degradation) inherent to protease enzymes there is no environmental hazardous effect from enzymes in the environment. As enzymes are quickly inactivated and biodegraded already during transport to and treatment in occupational waste water treatment plants and municipal sewers and sewage treatment plants . this aquatic toxicity is not relevant to the environment.
The fact that there are no hazardous waste products makes industrial enzymes the most environmentally friendly solution to most industrial problems.