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EO 012.01 TP3 SAMPLING WASTE DISPOSAL SYSTEMS. C-98-15W-002/MG-007 (A179) Waste Water Collection Systems and Treatment Plants, March 2006 Guidelines for.

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Presentation on theme: "EO 012.01 TP3 SAMPLING WASTE DISPOSAL SYSTEMS. C-98-15W-002/MG-007 (A179) Waste Water Collection Systems and Treatment Plants, March 2006 Guidelines for."— Presentation transcript:

1 EO TP3 SAMPLING WASTE DISPOSAL SYSTEMS

2 C-98-15W-002/MG-007 (A179) Waste Water Collection Systems and Treatment Plants, March 2006 Guidelines for Effluent Quality and Wastewater Treatment at Federal Establishment, April 1976 REFERENCES

3 GENERAL Treatment systems should be designed and operated so that the effluent quality discharged to receiving waters shall be IAW DAOD 4003–0, Environmental Protection and Stewardship Most stringent standards established by the federal government, the province, territory or municipality should apply

4 GENERAL Existing treatment systems should be monitored by means of sampling and analytical procedures that are in accordance with the latest edition of Standard Methods (For The Examination of Water and Wastewater) as published by the American Public Health Association, American Water Works Association, and the Water Pollution Control Federation In general, compliance with the numerical limits should be based on 24-hour composite samples with the exception of those parameters, which require grab sampling

5 GRAB SAMPLES Taken by sampling wastewater at one time at one point Cannot give much information about average conditions of the wastewater throughout the day but show the momentary condition for immediate control purposes

6 GRAB SAMPLES Grab samples are taken for the following tests: –Chlorine demand –Residual chlorine (FAC) –Settleable solids –Bacteriological analysis –pH –Temperature –Dissolved oxygen (DO)

7 A 24-hour composite sample consists of several effluent portions (usually one per hour) collected in a 24-hour period and composited according to flow COMPOSITE SAMPLES

8 Composite samples are taken for the following determinations: –Suspended solids –BOD & COD –Total and volatile solids of sludge –Phenols –Oils and greases –Phosphorous COMPOSITE SAMPLES

9 Sampling must be representative of the entire body of waste water Representative samples are difficult to obtain due to: –stratification of solids in conducting channels –rapid changes of waste water character caused by intermittent pumping –diverse character of waste water REPRESENTATIVE SAMPLES

10 This test indicates the amount of settleable solids that can be removed by sedimentation This test is taken daily on: –raw waste water –aeration tanks –final effluent SETTLEABLE SOLIDS TEST

11 SUSPENDED SOLIDS (MIXED LIQUOR) The purpose of the suspended solids tests is to determine the weight per unit volume of solids in the wastewater at various points in the treatment process

12 SLUDGE VOLUME INDEX (MIXED LIQUOR) The ratio of the settleable solids test to the suspended solids test gives an index which indicates the character of the sludge in the waste water tested SVI = settled sludge volume (mL/L) X 1000 suspended solids (mg/L)

13 DISSOLVED OXYGEN (DO) Test is used to monitor the biological treatment process Testing should be carried out at least once a day, preferably during the maximum flow period

14 BIOCHEMICAL OXYGEN DEMAND (BOD) Decomposition of organic matter is accelerated by the exhaustion of available oxygen; Prevention of putrefaction and the associated nuisance odours, depends upon the adequate supply of atmospheric oxygen to facilitate the development of aerobic organisms to oxidate organic matter The biochemical oxygen demand of wastewater, wastewater effluent, polluted waters, or industrial wastes is the oxygen in mg/L required during stabilization of the decomposable organic matter by aerobic action

15 BIOCHEMICAL OXYGEN DEMAND (BOD) Incubation for five days at 20° C is the standard procedure BOD amounts to determining the loss, or depletion, of oxygen on a sample incubated at 20° C for five days All wastewater treatment processes have a principal objective: the reduction of BOD More emphasis is placed upon the results of this test than on any other test at wastewater treatment plants

16 The pH in waste water is used to regulate the amount and type of treatment required The range for normal plant operation is from 6.8 to 7.2 It is good practice to operate with a pH on the alkaline side, above 7 The test is taken daily on raw waste water digester supernatant and plant effluent before chlorination pH

17 QUESTIONS


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