WABAG experts create the optimum process combination for every individual situation by choosing an optimised process solution that will meet the required treatment target including specific local conditions and customer needs. During this procedure, a choice can be made from a large pool of process elements.

One- and two-stage activated sludge processes are employed as key technologies and we have experience with different options like AO, A2O, Bardenpho, MLE, Contact Stabilisation, Step-Feed, Oxidation Ditches, Simultaneous denitrification and many othersThese conventional wastewater treatment methods are employed as standard solutions for average to high purification requirements. They guarantee ecological treatment for local authorities and therefore the environmentally compatible recirculation of the clarified wastewater back into the natural water cycle.

1.1 Fine Sieving
1.2 Clarification
1.3 Flotation (DAF)
1.4 Filtration  description in industrial water treatment
1.5 Desalination  description in industrial water treatment
1.5.1 Innovation iEDR™
1.6 Membrane Filtration  description in industrial water treatment

BIOGAS to ENERGY
Renewable energy. The possibilities offered by biogas utilisation.
The calorific value of the gas produced in the digesters during anaerobic stabilisation amounts to approximately 6.5 kWh/m3. This corresponds with more than half of the calorific value of natural gas (~10 kWh/m3). If the biogas is employed for energy generation purposes, electrical and thermal energy can be obtained for the in-house supply of treatment plants or feeding into the public grid.
Generation of electrical energy and waste heat in a combined heat and power plant:
 ~35-40% electrical energy, ~60% thermal energy.
 1 m3 biogas = 6.5 kWh = 2.3 kWh electrical + 4.2 kWh thermal energy
 Direct employment in gas engines
 Thermal utilisation through the generation of steam or hot water
Efficient utilisation means that a largely independent energy supply can be guaranteed with regard to the provision of the treatment plant with electricity for purposes such as the aeration of the activated sludge tanks, digester and building heating, and the hot water supply.
Large treatment plants can cover up to 100% of their energy needs through in-house generation.

WABAG has developed the innovative BIOZONE-AD® process for an even higher level of sewage sludge stabilisation. This process supplements standard anaerobic sludge stabilisation with an additional phase and involves the injection of pre-digested sludge with ozone, which results in the further oxidative decomposition of the sludge and thus increases its suitability for biological use. This “reactivated” sludge is returned to the digesters and intensifies the degradation process. The organic dry substance is further reduced and at the same time, biogas production is increased.
The process allows for an increase in biogas yield by up to 40 percent as well as for further sludge hygienisation and a decrease in the sludge volume in order to save landfill space. In addition, micro-pollutants (e.g. polycyclic aromatic hydrocarbons) are degraded. This can be of relevance for agricultural use when parameters such as that for benzo(a)pyrene exceeds the statutory limits.
 Extensive stabilisation – increase in the degradation of organic dry substance by up to 40%
 Increase in biogas production by up to 40%
 Reduced sludge quantities and disposal costs
 Enhanced dewatering – up to 15% improvement in dewatering behaviour
 Improved sludge quality – degradation of micropollutants
 Lower operating costs

Anaerobic sludge stabilisation constitutes the best solution for sewage plants with medium to large design capacity (from approx. 20,000 PE) with regard to cost and energy efficiency and environmental protection. Moreover, combustible biogas results from controlled digestion and this can be used for energetic purposes.

Key Features

• ƒƒA reduction in organic content of ~50% and its conversion into combustible biogas.
• ƒƒThe production of renewable energy
• ƒƒThe possibility of the independent supply of the treatment plants with energy
• ƒƒReduced operating costs
• ƒƒA stable and reliable process
• ƒƒA smaller footprint
• ƒƒA reduction in the volume of malodorous substances
• ƒƒSludge hygienisation (including bacteria reduction)
• ƒƒClimate protection through an improvement in the CO2 balance of the treatment plant

WABAG has a wide experience in all the technological aspect coupled to the design of Anaaerobic Digsters like: Shape of digester, Mixing solutions, Choice of heat exchangers, gas storage etc.

Depending on the individual demands made on a plant, an optimum result can also derive from dual stabilisation, which involves a combination of both – aerobic and anaerobic –  processes.

Takes place in open sludge tanks with the injection of air. Sufficient space constitutes the prerequisite for its use. Aeration and agitation mean that the energy requirement is higher than in the case of anaerobic stabilisation. By applying alternating aeration Wabag suggest to reduce the Aeration necessity  to a strict by achieving denitrification that also helps reducing additional alkalinity dosing.

During clarification, suspended solids (sand, sludge, organic substances), and some of the colloidal substances Coagulation and flocculation processes facilitate the removal of suspended solids and colloids from the water.

– OPUR®, OPUR-SK™
WABAG has developed this technology in the 1980s with the aim to reduce the footprint of clarifiers after the flocculation and coagulation treatment steps. Having been launched, the WABAG lamella clarifiers have been implemented on numerous drinking water production plants. The flocculated inlet water is fed to the bottom of the reactor and flows upward trough the lamella plates. Here the flocs start settling and thanks to the lamella, they only have to sink a few cm before hitting the lamella surface from where they will slide downward, to be thickened at the bottom of the settler. Whereas the clarified water leaves the lamella on the top continuing through concrete trough to leave the settler. The lamella plates are in a corrosion and UV-resistant material. They are fixed using a stainless steel structure.

During filtration, suspended solids are separated from a liquid. The filter can be made of sand or other porous materials. The liquid that passes through the filter is called filtrate.
WABAG-advanced filtration system (drainage floor, flap valve, etc.)
Filtration is one of the key processes involved in the treatment of water. The technology was developed in the 1960s but has undergone continuous enhancement ever since. The origins of wastewater filtration can be traced back to the 1970s. Today, a whole host of systems featuring nozzle floor and drainage floor technology are available for every conceivable application.
WABAG filters are used for a variety of purposes in the treatment of drinking water. Specific treatment targets can be achieved by using a particular filter medium or a particular combination of media in the filters. To ensure a successful filtration process, it is just as important to know about the quality, origin, and possible combinations of filter media as it is to have a good grasp of hydraulic dimensioning and filter construction.

Membranes represents very fine filters, which act like sieves through which water is either pressed or sucked. Any content, which is larger than the microscopic pores, is uanable to pass and depending on the fineness of the filter, a differentiation is made between micro-, ultra- and nanofiltration. Reverse osmosis is an additional variation, in which only water molecules pass through the membrane.

Ultrafiltration membranes have established a position in the drinking water sector because they filter water to such an extent that it is virtually free of solids and, most organics. Bacteria, parasites and viruses are not killed off, but entirely removed from the drinking water since they are large than the pores of the membrane.

WABAG has been using this membrane process in combination with conventional cleaning processes for many years and due to this experience and in-house innovations, has built up a pool of comprehensive expertise. Company know-how relates to an extensive knowledge of the performance and applications of the various membrane types and combinations with other treatment phases to meet specific requirements on a case-to-case basis. WABAG offers a diversity of membrane processes and selects the best and lowest-cost variation for each application.

Key Features:
– Complete removal of turbidity and color
– Mechanical “disinfection”
– Low space requirement
– Modular design
– Membranes as absolute barriers

CERAMOPUR®. Ceramic Membrane Filtration. Indestructible.
With a pore size of around 0.1 µm, the ceramic membrane operates in the microfiltration range. This means that large quantities of water can be filtrated per m² of membrane surface. When combined with flocculation or oxidation, the degree of separation that can be achieved is similar to that of ultrafiltration. The ceramic membrane offers many advantages over standard ultrafiltration membranes made from synthetic material. Ceramic is completely insensitive to pH and does not oxidize. What’s more, this material is extremely hard and stable (monolithic), which enables highly efficient backwashing using high-pressure water.

Key Features:
– Complete removal of turbidity and color
– High recovery rates
– Very high flux (specific flow through membrane)
– Resistant to chemicals and ozone
– Life span of membrane cassettes approx. 30+ years

CERAMOZONE® – Ceramic membranes combined with Ozone.
What makes the ceramic membrane unique is the nature of the material. In contrast to “normal” membrane fibers, which are quickly destroyed by ozone, ceramic membranes respond positively to any residual ozone in the water: the ozone contained within the water minimizes the fouling potential on the membrane surface. In a best-case scenario, there is no longer any need for chemically enhanced backwashing. This process has already been tested by WABAG on a pilot-project scale using different grades of water. The technology is now ready for use on a large scale.