effluent

Our WWTPs are provided in two basic structures, the SABRE, which is a masonry and concrete structure and the COBRA, which is a prefabricated containerised unit. We utilise two related treatment processes for treating biological effluent. The first is the conventional Activated Sludge process and the second is the Membrane BioReactor (MBR) process. The three main groups of bacteria active in the plants are anaerobic, aerobic and anoxic. The returned aerobic sludge is starved of oxygen in the anoxic tank, resulting in de-nitrification. Both processes utilise the natural bacteria to break down the organic matter in the effluent stream and convert it to stable sludge, treated liquid effluent and gasses such as CO2, methane and N2.

CUSTOM WWTW

Each WWTP is custom designed based on the flow and effluent parameters supplied by the client. We treat effluent from domestic, commercial and industrial origins, including housing estates, shopping centers, hotels, lodges, wineries, abattoirs and dairies. The type of effluent will determine the process steps required. Alveo is not limited to one type of process or technology, but will implement the best tried and tested method to suit the solution. We employ several process engineers to determine the correct approach and design the most suitable process for the situation. Our solutions cover a wide range of technologies and include anaerobic, anoxic, aerobic, flocculation, Dissolved Air Flotation (DAF), Membrane Bioreactors (MBR), Reverse Osmosis (RO), etc, processes among others.

MBR

Membrane Bio-Reactor technology or MBR technology is the cutting edge in waste water treatment solutions. MBR technology combines simple micro filtration with bio-digestion to reap the benefits of physical separation and biological removal all in one. While conventional return activated sludge (RAS) systems have been proven to produce quality treated effluent when operated correctly, RAS effluent quality is still highly dependent on a number of conditions including environmental, influent parameters and operational factors. The dependency of effluent quality on these conditions is largely removed with an MBR system, as these conditions have little influence on the physical separation that takes place with the membrane. Thus, an MBR system delivers consistent water quality of a far higher standard than RAS and is more robust to the above mentioned external performance factors. Furthermore, because there is almost no carry-over of suspended solids in a MBR system, it is possible to increase the concentration of bio-active micro-bacteria to as high as four times more than a RAS system. This is important as these bacteria are responsible for the digestion of the organic matter in the waste water. This higher concentration means that superior bio-digestion can take place in a far smaller area than in a RAS, which leads to a major cost saving on the civil works.

The MBR plants come in two forms being the insitu built SABRE or containerised COBRA.

PACKAGE WWTW

Our standard Return Activated Sludge (RAS) package plants consist of the following stages; an anaerobic stage, anoxic stage, aerobic digestion stage and disinfection stage. The anaerobic stage will breakdown large organic molecules such as proteins and carbohydrates by utilizing anaerobic bacteria, this allows for further digestion downstream. The anoxic stage will remove nitrates and phosphates by utilizing anoxic bacteria in the absence of oxygen. The aerobic stage will remove further organics by utilizing aerobic bacteria in the presence of oxygen. A clarifier is placed at the end of the biological processes in order to separate the sludge from the clarified fluid. The effluent from the clarifier is disinfected using sodium hypochlorite. The treated effluent can be discharged to a water course or used for irrigation. The sun dried sludge can be removed from the drying beds and then composted to be used as fertilizer.

The Package WWTPs come in two forms being the insitu built SABRE or containerised COBRA.

COBRA

SABRE