Operating Manual - KLARO GmbH

Operating Manual for SBR small wastewater treatment systemsThis ventilation causes two effects at the same time:• The micro-organisms of the activated sludge are supplied with oxygen that is required fortheir metabolic activity and, thus for the degradation of the contaminants.• There is intensive contact between wastewater and bacteria.- Work step 3: settling phaseThis work step constitutes a resting phase, during which no ventilation takes place. Theactivated sludge can settle according to the principle of gravity (sedimentation phase). In theupper area, a clearwater zone develops and a sludge layer at the bottom. Any occurring floatingsludge is above the clearwater zone.- Work step 4 (valve 3): clearwater extractionDuring this phase, the biologically treated wastewater (clearwater) is pumped out of the SBRstep. This pumping process is carried out by means of air according to the airlift pump principle(air lift). The air lift is designed in such a manner that any occurring floating sludge on theclearwater layer is not pumped. A minimum water level in the SBR step is kept without anyfurther components.- Work step 5 (valve 4): excess sludge extractionDuring this working step, excess activated sludge by means of the air lift is led back from theSBR reactor chamber into the sludge storage chamber and stored there. This excess sludge ispumped close to the bottom of the SBR chamber.After this fifth work step has been completed, the treatment process can start again with work step 1.Four of the cycles described above are normally processed per day. An individual adjustment of theswitching times and the cycle number is possible after consultation with KLARO GmbH. This adjustmentmay only be carried out by an authorised specialised maintenance company.In addition to this, it is possible to manually switch the plant into the vacation mode. The vacation modeis a significantly reduced operation of the plant during longer periods of time without inflowingwastewater.By means of the KLplus control, the plant can be operated depending on the actual amount ofwastewater. For this, the fill-level detection must be activated by a specialist.Important: All chambers / containers must be aerated. This is normally performed by the wastewater linevented via the roof. If required, additional ventilation lines or ventilation openings must be installed. Indoing so, the ventilation lines must be positioned in such a manner that natural ventilation is possible(chimney effect).4.2. Plants with additional nitrogen eliminationThe nitrogen degradation is also carried out biologically by means of certain strains of micro-organisms.Plants with additional nitrification create, by means of particularly intensive ventilation, optimum livingconditions for nitrifying bacteria which convert ammonia to nitrate. In plants designed for additionaldenitrification, the circulation of the water and activation of the denitrifying bacteria are achieved by short12KLARO GmbH