Energy Efficiency in Wastewater Treatment Plants

One of the most important problems of wastewater treatment plant operators, whether domestic or industrial, is operating costs. One of the most important factors affecting operating costs in treatment facilities is the increasing energy cost day by day.

Facilities that have not received a good engineering service or have not undergone the necessary maintenance, repair, and renovation processes during the operation phase and are behind the technology create great difficulties for the operators in terms of energy use. Improvement of this situation by considering the benefit/cost ratio has become an indispensable situation for both the operator and our country.

In order to ensure energy efficiency in existing wastewater treatment plants, 3 main points should be evaluated first,

The minimization of the energy used in the existing facility,

Addition of renewable energy units within the facility area

Possibilities of energy recovery from the products in the process stage.

For energy efficiency in existing facilities, it is necessary to first examine the treatment process and technology. Raw water and effluent analyzes should be followed carefully and necessary chemical or physical interventions should be made according to the analysis results. This situation, which affects the working hours of the equipment, will be beneficial in terms of energy costs.

Due to the fact that the equipment used in the treatment plants is worn out over time and the technology lags behind, it should be ensured that the energy consumption operating costs are reduced by selecting alternative or less energy-consuming equipment by making the necessary measurements, especially in the high energy-consuming equipment, pumping pumps, ventilation equipment, and sludge dewatering equipment.

Within the framework of the principle of treatment at the source, wastewater, factory, hospital, etc. It should be followed by pre-treatment in the facilities, taking the water to the facility in accordance with the plant treatment technology, and removing the floating substances as much as possible in the entrance structure by means of mechanical and/or manual screens happens.

Considering the ventilation equipment used,

In terms of oxygen transfer, disc, plate, or tube-type aerators are more efficient than surface aerators and therefore more economical in terms of energy consumption.

Monitoring the air requirement with oxygen meters and regular calibration of the oxygen meters used will prevent the system from working unnecessarily.

Blowers, which are one of the biggest energy-consuming equipment of the facility, should be evaluated in terms of energy consumption and the aerator should be considered in terms of energy consumption.

In addition to the above-mentioned two issues, the energy consumed by the additional mixers that may be used in case of need for additional mixing should not be ignored.

Another issue that should be considered in the improvement of existing facilities is that the pump groups used are PLC / SCADA etc. It is followed by automation and optimizing on / off times.

Ensuring the water transfer in the process with gravity as much as possible, minimizing the pump need in both water and sludge transfer, and making the pump selections within the framework of standards will prevent unnecessary energy consumption. Energy consumption increases due to wear on the pump fans over time and unnecessarily large equipment. With the correct hydraulic calculations and controls made in the pumps, the working efficiency and energy consumption of the equipment should be optimized. At the same time, using frequency converters, the equipment will be prevented from working unnecessarily at full load.

ENERGY EFFICIENCY IMPROVEMENT STAGES IN WASTEWATER TREATMENT PLANTS

 

Potential energy improvement activities need to be identified, evaluated, and prioritized.

 

Today, Solar Energy Systems make a significant contribution in terms of supporting the energy need of the facility and contributing to the energy production of our country. In this context, empty spaces can be created with appropriate projecting in the parcels reserved for wastewater treatment plants, especially in Organized Industrial Zones, and Solar Energy Power Plant works can be planned for these sections. These studies, which are carried out with the incentives given by the state such as VAT exemption, purchase guarantee, and customs tax exemption, can provide significant gains to businesses.

One of the foremost difficulties in the operation of wastewater treatment plants is the disposal of waste sludge. Due to problems such as the capacity problems of waste storage areas and increasing disposal costs, a way to reduce the increasing sludge load in today’s industrial conditions is sought. Biogas production from waste sludge with high calorific value can be considered as one of the options, as one of the feasible ways in terms of both sludge disposal and economic return. The method currently being applied in the Adıyaman Advanced Biological Treatment facility is based on the digestion of the biological sludge formed in the facility in tanks accumulated by creating an anaerobic environment and obtaining methane gas. Biogas production; Since it is a renewable energy source, it should be an option that should be evaluated considering the benefit-cost ratios for both the operator and our country, since it is always open to production without being affected by weather and climate conditions.

DAMLA Treatment and Environmental Technologies conduct field studies, project design, and modeling studies in existing enterprises in terms of both economic life and energy efficiency of the equipment used in the field of Wastewater Treatment Plants to ensure that the treatment facilities are operated at maximum efficiency by consuming more energy.