PCO WASTEWATER SAMPLING AND ANALYSIS

EMB-National Capital Region (EMB-NCR) Pollution Control Officers (PCOs) Training February 12, 2009 WATER/WASTEWATER SAMPLING AND ANALYSES Engr Mavic S Quides DENR-EMB-NCR 2009 03/01/21 SAMPLING DEFINITION & OBJECTIVE, PURPOSE/S What is SAMPLING? collection of truly representative samples which when analyzed yield results reflecting actual quality of the water samples Objective : To collect a portion of material small enough in volume to be transported conveniently and handled in the laboratory while still accurately representing the material being sampled Purpose/s  Compliance with regulatory requirements :  Evaluation of performance efficiency of WTP system  Evaluation of effectiveness of in-house waste minimization measure/s 03/01/21 SAMPLING STATIONS  Influent – Collected at points at highly turbulent flow and upstream/above of plant return lines  Effluent – Collected at the most representative point downstream of all treated or untreated combined wastewater streams before entering the receiving waters  Mixing Zone – The average length of the mixing zone from the point source is approx five (5) times of the effective width of the receiving water  Others – Outfalls suspected discharging pollutive WW – Effluent Streams from each treatment units 03/01/21 TYPES OF SAMPLES  Grab or Catch – A sample collected at a particular time and place can represent only the composition of the source at that time and place  Composite – Combination of grab samples collected at the same sampling point at different times 03/01/21 SAMPLE HANDLING COMPONENTS ✔ Container Requirements Plastic or Glass(one may be preferred over the other depending on the type of parameters) ✔ Preservation Methods Refrigeration (Cool @ 4oC) Chemical Addition - Acidification (pH adjust