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ADVANTEX° 0&-M MANUAL. 3 Verify that there is equal spray on and under all orifice shields. (Each orifice shield should. show signs of organic biomat build-up on and underneath it.In this case,a clean orifice shield top is not better!) If the squirt height is 40-50%higher than the start-up value,clean and flush the manifold. (A 50%increase in squirt height signals approxi- mately 18%orifice blockage.)To flush laterals 4 Check for clogged orifices(orifice shields with- you can run rhe pump or use a borne brush or out spray at'biomat build-up underneath).You should be able m observe uniform water droplets Fl-hing with primp dancing around orifice shields while dosing. Flushing with pressure washer or bots&brush pressure washer.Brushing or pressure washing is best. (When flushing.laterals,blosolids slough ' into the bottom of the filter;flushing the under- drain at the same time,then return to the tank.) Verify again that all orifices are clear.Recheck squirt height. 5 Assess the character and color of the biomat.If it seems appropriate,take a photo and comment 8 Regardless of squirt height,be sure to open the. on the growth and characteristics of the biologi- flush valves and run the pump for mro-to-three cal mat under and around the orifice shields. minutes to flush solids and biomass from the Biomats are natural and normalcy appear light- pod's underdrain back into the tank.This only U texture. takes a couple of minutes and can be done while brown to dark-brown and gelat ious If the mat appears too light(yellowish with the accomplishing other tasks. texture of lard,'wax,or margarine),ihe`grease 9 Verify passive ventilation and air flow. Use an and oil concentrations should be checked. anemometer(available through Orenco) to 6 Check the odor emitting from the filter.If a measure the air flowing through the system. strong or offensive odor(e.g.,smell of rotten 1-3 cubic feet per minute(cfin) is typical.The eggs,rotten cabbage,etc.) is emitted,measure the following chart shows how much airflow is DO level in the filtrate and recirculation sham- needed*to handle the indicated strength of ber and adjust the recirc time,if necessary.. BODS and ammonia: (Normally.systems will smell musty ,earthy,or Unit Flow BODE Ammonia Req.Air Flow moldy but not pungent). (914 WnWIL) (m9&) lcrm) 7 Check squirt height and compare residual pres- X= 500 150 65 0.e sure against the start-up value.This may take *Ulsimate4 treatment is accomplished and fine!effluent longer than just cleaning and,#ushing the mani- quality provides the effective measure oftrratment per- fbld,but will help establish frequency of cleaning. fnrmance and capacity Typical dissolved oxygen kw1s in the filtrate e�lu mt will range from 3.5 to 5 mg1L DO.