Related Experiment Videos
Small scale water recycling systems--risk assessment and modelling
1School of Water Sciences, Cranfield University, Cranfield, Bedford, MK40 0AL, UK.
Summary
This study assessed a grey water recycling system using risk analysis. System failures, like disinfection or pump issues, can increase health risks from microorganisms and cause odors.
Area of Science:
- Environmental Engineering
- Risk Assessment
- Water Recycling Systems
Background:
- Grey water recycling systems offer water conservation benefits for domestic use.
- Assessing the performance and potential risks of such systems is crucial for safe implementation.
- Proprietary single-house grey water recycling systems require specific performance evaluations.
Purpose of the Study:
- To quantitatively assess the performance of a proprietary single-house grey water recycling system.
- To identify and evaluate health and economic hazards associated with domestic grey water recycling.
- To model the risks and potential consequences of system failures.
Main Methods:
- Quantitative risk analysis and risk modeling were employed.
- Simulation modeling tools were utilized for performance assessment.
- A preliminary Hazard and Operability (HAZOP) study identified key hazards.
Main Results:
- Disinfection system failure significantly increases the probability of Salmonella spp. infection from 0.001% to 4%.
- Pump failure in the recycling system leads to increased anaerobic conditions and decreased dissolved oxygen.
- Simulation indicated potential for odor problems due to pump failure and subsequent changes in water chemistry.
Conclusions:
- The performance of grey water recycling systems is sensitive to component failures, particularly disinfection and pumps.
- Health risks, such as microbial infections, are a significant concern during system malfunction.
- Simulation modeling provides valuable insights into operational failures and their environmental consequences, like odor generation.