Pumping Out the Problems: Wastewater Treatment Inhibition From Portaloo Products

Cady Burns, The Wastewater Specialists

The portable toilet, otherwise known as a ’portaloo’, is widely used at public events as well as construction sites. An essential component of this service is portaloo upkeep and cleanliness, where waste is removed and a range of products are used to deodorise and sanitise, often leaving a distinct odour and colour behind to mask the sight and smell of the waste. The portaloo waste is often discharged into a municipal wastewater treatment plant (WwTP). Portaloo products have the potential to inhibit biological wastewater treatment processes.

This research addresses a knowledge gap about the possible toxicity of portaloo products within a biological WwTP. Using respiration based toxicity testing (RBTT), portaloo products commercially available in New Zealand were tested for potential inhibition. The results of this testing are presented in this paper.

This project has several important implications for both WwTPs and Te Mana o te Wai. There is an increasing importance for the chemicals we use to be environmentally friendly, and Te Mana o te Wai is encouraging higher standards for wastewater treatment to improve environmental outcomes. As our population grows, we will put more of a strain on the wastewater system, therefore we must understand the affects that different chemical inputs may have. This project is not only important for environmental protection strategies and policies, but also for public health. Furthermore, this paper assists industry, providing important insight on the environmental impact of the products used.