Jar Testing

Jar Testing

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Click below to see a jar test study with plating metal waste. This is an excellent example which incorporates a coagulant, metal precipitant, pH adjustment, and flocculant addition. The results of this jar produced < 1 NTU unfiltered turbidity.

Please note the difference in pinfloc formation from coagulation versus large floc formation during flocculation.

To play videos, click the play button on each

Raw Wastewater at pH 1.5 –Control Jar on Left	pH adjustment to 9.5 during fast mix stage –see slight color change due to precipitating metals.	Heavy Metal Precipitant Dosage & Coagulant Dosage during fast mix stage—HMP causes dramatic color changes as compared to the control jar.
Pinfloc forming from Coagulation—looking closely you can see pinfloc form.	At this angle, along the edge of the jar, you can see the pinfloc that has formed.	Flocculant addition during slow mix stage—as the flocculant goes into solution you can immediately see large floc form.
Flocculation Stage during slow mix to bridge floc together for more efficient settling.	Settling Stage—see how quickly this floc settles after mixer turned off.	Supernatant Clarity—this jar formed very clear water (1 NTU).

FAQ

Q. How do I know how fast to mix my jars?
A. In a jar test, you want to mimic the wastewater treatment system (i.e. mix speed, mix time, pH adjustment, dosages, etc.). Almost always, coagulant should be fed with fast mixing and flocculants diluted and fed with slow mixing. There are exceptions and a jar test done properly can predict the success of an on-line trial. Many times the jar analysis will confirm inefficiencies in the equipment such as lack of retention time, not enough mixing, sheering, etc.

Q. Is a jar test only visual or can useful data be collected?
A. If done properly, useful data can determined regarding proper dosages, effluent quality (filtration and analysis of the jar supernatant), sludge production, heavy metal concentration, etc. Call to help you optimize your program or bench study.

See Also:

Program Design

Back to Wastewater Treatment Page

Other Sections

Heavy Metal Removal Plant Efficiency

Biochemical Oxygen Demand (BOD) Reduction Municipal Wastewater

Chemical Oxygen Demand (COD) Reduction Wastewater Recycling

Total Organic Compound (TOC) Reduction Biological Treatment

TSS and Clarification Wastewater Evaporators

Arsenic Removal Ozone

Water Re-use Cyanide Removal

Oil/Water Separation Lead Removal

Emulsion Breaking Chrome Reduction & Removal

Oil/Grease Separation Hexavalent Chrome

Odor Neutralization Nickel Removal

Sludge Dewatering (Conditioning) Copper Removal

G.R.A.S. Chemistry Mercury Removal

Coagulation Mixed Metals Removal

Flocculation Chelation

Polymer Chemistry Metal Precipitation

Organic Chemistry Phenol Removal

Inorganic Chemistry Odor Control

Jar Testing Ink Removal

Program Design Poly Blend Sizing

Plant Design

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