Technical Tours: 11 June 2024

Tour Bookings

Please select the specific technical tour as part of your conference registration booking, or contact the registration coordinator, Stacey Lawrence |

1. Sludge Treatment Technologies at the KwaMashu Wastewater Treatment Works (WWTW)

A tour of two sludge treatment technologies, namely, the Latrine Dehydration and Pasteurisation (LaDePa) and Enhanced HydroThermal Polymerisation (EHTP) in eThekwini.

These technologies treat faecal sludge (FS) from on-site toilets and wastewater treatment (WWT) sludge. The demonstration is aimed to scale up and evaluate these technologies and assess new business models for adapting to the circular economy using FS and WWT sludge.

EHTP processes sludge as well as a wide range of biomass to a sterile carbon neutral hydrochar that is used primarily as a biofuel. The hydrochar can also be used for other applications such as a soil conditioner, adsorption media, building material and for extraction of high value products.

LaDePa Separates household waste from FS using a screw. The FS is extruded to form pellets, which are then exposed to medium wave infrared radiation. The final product is in the form of dried and pasteurized nutrient-rich pellets that are safe to handle, with minimum exposure to pathogens that is suitable for use in agriculture.

2. Pilot Non-sewered sanitation technologies serving informal settlements within the eThekwini Municipality

Two types of non-sewered sanitation technologies piloted at informal settlements to treat effluent from community ablution blocks (CABs). The treated effluent is recycled.

The Enviro Loo Clear is a non-sewered sanitation system (NSSS) that treats blackwater only. A NSSS treats human excreta and sometimes other acceptable inputs (such as menstrual products) onsite (i.e. it is not connected to the sewer nor requires transport of the waste offsite for treatment). The blackwater from the toilets is treated through a membrane biological reactor that separates the pollutants. The treated water is then disinfected through ozone circulation and reused for toilet flushing thereby reducing the water demand for flushing.

The Aquonic Wastewater Treatment System is an onsite treatment system that treats black and greywater into pathogen-free reusable water for flushing and irrigation. It is suitable for the treatment of wastewater from septic tanks, urinals, showers and sinks. The system treats wastewater through a series of biological processes and electrochemical disinfection.

3. Durban Water Recycling (DWR)

A highly specialised tertiary water treatment process, specifically tailored to meet the high water quality requirements of DWR’s main client, Mondi Paper. Located in the grounds of Durban’s Southern Wastewater Treatment Works (SWWTW), the plant was commissioned in May 2001. The plant has a capacity of 47.5 million litres that treats a mix of domestic and industrial wastewater to a near potable standard for sale to industrial customers for direct use in their processes.

4. Integrated Decentralised Wastewater Treatment System (DEWATS) and Low Flush Urine Diversion System as a Sustainable Onsite Sanitation and Resource Recovery System for Rural Schools

Low flush urine diversion toilets connected to a decentralised wastewater treatment system (DEWATS) provides safe and hygienic sanitation to approximately 800 learners at Julukandoda Primary School while providing an opportunity for nutrient recovery from the treated effluent for the farming cooperatives in the KwaDulela Area. Many studies have proved the potential of urine and treated wastewater for agricultural use with regard to improved soil properties, crop nutrient uptake and yields.

Although, still in the construction phase, this integrated system has the potential to improve the quality of education and health for learners. In addition, the innovation will present an opportunity to create jobs and generate income to the community through agriculture using the nutrient recovered from the system. The use of human excreta waste for crops such as nursery plants and ornamental trees could help to the transition the system towards the circular economy where ornamental plants produced in rural communities are sold to cities and the trees (indigenous and fruit trees) are used for restoring ecological infrastructure, and sustainable and resilient ecosystems.

The business opportunities are possible through the use human excreta waste as source of fertilizer and fertigation water. The project also aims to farm vegetables in open land using the nutrient resources recovered from the sanitation facilities for irrigation. A tunnel will be installed, that will benefit the agricultural cooperatives who will grow seedlings. A borehole will also be installed to ensure that there is regular water supply for the toilets and to mitigate the water supply challenges currently faced by the school.

5. Siza Water Re-use Plant

Siza Water Company (Pty) Ltd. provides water and wastewater services to residents in the Dolphin Coast region of South Africa. They operate a state-of-the art water recycling plant that augments the water supply to its customers.

6. Darvill wastewater works – Water Reclamation Plant

Darvill WWW is a new upgraded treatment plant in Pietermaritzburg. It has a design capacity of 100 Ml/d and currently treats wastewater from about 700 000 people. It also has a water reuse plant that further treats water (2Ml/d) to potable standards

Mark your calendars!
The WISA 2024 Biennial Conference & Exhibition will now take place from 12 to 14 June 2024

As Wednesday, 29th May has been declared as the day of South African General Elections, we had to change our dates.

The venue, speakers, workshops, interactive sessions, and networking opportunities will remain the same.

You now have two extra weeks to register, make travel plans, tweak presentations, refurbish stands and perfect your networking skills.

If you have any questions or concerns, please do not hesitate to reach out to us at

We understand that this change may cause inconvenience for some of our attendees, and for that, we sincerely apologise.
Our team is working diligently to ensure a smooth transition and to assist with any adjustments.

*Pre-Conference Technical Tours will be hosted on Tuesday 11 June 2024.