Urban waste water treatment


The company successfully implements the use of chemicals in municipal sewage treatment facilities (sewage treatment plants). Physico-chemical treatment is accepted worldwide, and is widely used in large facilities.
In a large number of facilities in Canada, the USA and Scandinavia, the treatment is only physico-chemical due to temperature limitations. Is a technological and economic breakthrough in Israel.

Beyond the infrastructure constraints of the sewage treatment plants (population is growing and the flows to the sewage treatment plants are growing accordingly) and the economic savings inherent in the technology, there is a regulatory aspect that has worsened in recent years and makes the use of chemicals more common.

The use of chemicals in municipal wastewater treatment facilities enables the following objectives to be achieved:

● Immediate increase in the capacity of the sewage treatment plant, without the need to build additional treatment lines and basins.
● Improving the quality of effluent for the purpose of returning water to agriculture and industry.
● Reducing the concentration of phosphorus in accordance with the standard requirements with a minimum investment.
● Removal of phosphorus to prevent the formation of strobitus in the sewage treatment plant lines.
● Removal of heavy metals and fats to prevent biomass poisoning.
● Color removal, and secondary effluent adjustment for UV disinfection
● Improving the function of the facility: saving on electricity costs and sludge removal.
● Reducing investment in the construction of new facilities, while combining chemical and biological treatment.
● Providing a seasonal solution to various problems in the sewage treatment plant: sedimentation, certification and squeezing problems caused by changes in biomass, receiving abnormal currents and / or temporary shutdown of parts in the sewage treatment plant and more.

The emphasis in the solutions proposed by S² is on their being economically viable, immediately available and scientifically proven. S² engineers will perform performance analysis of the facility including laboratory tests, facility inputs and ongoing monitoring. After analyzing the data, the company will recommend the optimal application based on the existing situation.
If there is justification for the changes, the company's engineers assimilate the technology while analyzing the function of the facility in real time and accompanying the professional staff of the Sewage Treatment Plant.

Increasing the capacity of existing facilities

Chemically Enhanced Primary Treatment (CEPT) has the potential to increase the capacity of existing lines in the treatment plant up to 30% and can be applied immediately. .

For CEPT application, increased initial sedimentation, a number of significant advantages:

● Increasing the rate of settling: according to facility planners 4 times more than natural settling.
● Improving the initial sludge density (higher solids concentration)
● Reducing organic loads on the biological reactors - reduction in oxygen consumption (electricity costs) and reduction in the amount of WAS
● Improving digestion by increasing the ratio of primary sludge to WAS - increasing methane output.
● Application of joint sludge certification (if appropriate for the infrastructure in the sewage treatment plant)
● Significant reduction in sludge removal due to reducing the amount of dry sludge and improving solidification.
● Savings in polymer consumption and operation of the firming system.

Improving effluent quality

The water shortage that characterizes the State of Israel requires the return of effluent water for agricultural purposes.
By physico-chemical treatment, the quality of the effluent can be improved at the exit from intensive and extensive facilities and thus provide the required quality. The results are immediate and without the need for investment.

Use of CEPT to reduce the cost of treatment in a sewage treatment plant

Facilities where there are primary settling basins, CEPT (increased initial settling) can be applied

The CEPT implementation saves the operating costs of the Sewage Disposal by:

● Reduction of power consumption in the ventilation system due to the reduction of the organic load in the biological reactor.
● Reducing the amount of excess sludge (WAS) discharged to the digestive tract.
● Reducing the cost of clearing dry sludge due to increased decomposition and reducing the overall amount of sludge.
● Reducing polymer consumption for sludge certification and sludge firming.
● Reducing the working hours of the firming saves electricity and equipment wear
● Increasing methane production which can be used to generate electricity

A combination of physico-chemical treatment together with biological treatment, allows significant savings when investing for the purpose of building a new facility.

Wise use enables the achievement of several goals at the same time and thus not only cover the expense for the coagulant, but also result in overall savings in the efficient and smart operation of the sewage treatment plant.

Phosphorus removal

1. Improving water quality

Poisoning of drinking water sources by algae originating from high phosphorus concentrations in water is a well-known phenomenon that is becoming common in the world. As a result, the regulator in Israel has set stricter requirements for maximum phosphorus concentration in the discharge of effluent into streams.
Originally removing phosphorus is an effective way to reduce and prevent the growth of algae in various bodies of water. As is well known, biological removal of phosphorus is limited and with the entry into force of the Inbar Committee regulations many municipal sewage treatment facilities were required to improve the quality of their effluents. The application of aluminum salts in favor of chemical precipitation of phosphorus is a common and common technology for use worldwide.
The company is implementing the chemical removal in a number of treatment plants.

2. Prevention of struvite sedimentation

Chemical phosphorus removal has another aspect of preventing the accumulation of struvite in pipes and equipment in the anaerobic treatment line (digesters, pumps, heat exchangers, centrifuges, pipes and more). A considerable number of sewage treatment plants suffer from the phenomenon of the formation of strobit tumors in the tubes.
The use of sodium aluminate in digesters to remove phosphorus in the digestive tract prevents the formation of strobit. In addition, the use of sodium aluminate increases alkalinity and helps stabilize the biological process.