What is this BS EN 12255-10 - Wastewater treatment about?  
BS EN 12255-10 is for the protection of employees and defines safety requirements for wastewater treatment plants to be constructed or reconstructed as follows:
- for structures and parts of structures where safety factors have to be taken into account
- all components of the technical equipment, as far as safety requirements have to be observed in the planning and construction of these parts of the plant
It may be possible that national regulations exceed the requirements laid down in BS EN 12255-10. In this case these requirements shall be precisely described.
Special safety requirements, e.g., in the fields of electrical and mechanical engineering which are dealt with in other regulations, shall be observed although they are not mentioned specifically in BS EN 12255-10.
BS EN 12255-10 is of relevance only to new wastewater treatment plants and new parts for existing plants designed and constructed after the effective date. This standard is not to be applied retrospectively to existing plants.
Who is BS EN 12255-10 for - Wastewater treatment? 
BS EN 12255-10 on Wastewater treatment is useful for: 
- Urban wastewater collecting systems 
- Urban wastewater treatment plants 
- Plants treating industrial wastewater similar to urban wastewater  
- Water supply treatment plants 
- Sanitation department authorities 
- Public works department officials  
- Government and municipality officials 
Why should you use BS EN 12255-10- Wastewater treatment?  
Treatment of wastewater provides an opportunity for resource recovery, that helps to drought-proof ongoing operations. Reclaiming and reusing industrial wastewater reduces demands on limited freshwater resources, as well as the amount of wastewater and the associated contaminants that are released to the environment. 
BS EN 12255-10 provides a safety principles for wastewater treatment plant , along with a water  quality parameter list. The usages of the classification and coding system face different users, namely the entrepreneur or the government.
BS EN 12255-10 is intended to provide safety and health guidelines that helps to promote understanding between different business parties, governments, to collaboratively develop wastewater treatment and reuse technologies among different countries, improve the efficiency of industrial wastewater reuse, and save and protect the environment. Due to the similar nature, it applies to wastewater treatment concerning discharge. 
BS EN 12255-10 describes wastewater treatment safety guidelines that covers the basic and most important safety information required to properly operate industrial process waste-streams to quickly determine the requirement of the appropriate treatment or reuse technology options for specific industries, reduce operating costs for enterprises, and ultimately promote the systematic development of process water treatment and reuse technologies for industrial application. 
