Ask an expert: Are these chemicals harmful to human body (sewage treatment plant)?

If only acid or alkali does not do much harm to the human body, it only hurts the respiratory tract, but from the situation you described, the harmful components in your sewage should be very complicated. When these harmful components react with strong acid or alkali, the products will cause different degrees of harm to people, depending on the components, but it is certain that the harm to human body should be very serious. Please be careful and take protective measures.