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Thread: Single-Step Flocculation for reclaiming Parts Washer wastewater?

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    Single-Step Flocculation for reclaiming Parts Washer wastewater?

    Hello,I am interested in knowing if a single-step wastewater clarifier/reclaimer can be made for used Parts Washer effluent.

    References can be found here :-


    I then spoke to a company in the US who have sent me some samples as per their experience of similar applications. Link -

    The equipment we would like to design will include a Treatment tank with a Mechanical stirrer. The effluent will be fed into the tank where the flocculant is added and then stirred.

    After flocculation is complete, the liquid is passed through a Filter Paper Bed and collected in a collection tank underneath.
    This water can then be sent through some post-filtration to remove odor/color (would like your suggestion for this) and then re-used in the same machine / different process / gardening etc.

    i have tried a pre-pre-preliminary trial with a sample of wastewater i had collected during a visit to a client. The wastewater was basically effluent from an Ultrasonic Part Washer. Effluent consisted of an alkaline cleaner in 3-5% concentration with water used for over 2 weeks. There is a thick layer of oil and the liquid has quite a fair bit of suspended particles from the washer. Here's a pic of the effluent - WhatsApp Image 2020-03-15 at 12.22.38.jpg

    So i have treated 100ml samples of this liquid at a time with 0.5-2% of the Cleartreat flocculant. Four different Flocculants were tried with varying degree of results. For agitation, I stirred using a spoon

    I observed that most Flocculant powders worked upto a certain extent at the first dosage of 0.5%, in that they helped form Flocs that floated on the surface of the liquid WhatsApp Image 2020-03-15 at 12.22.38 (2).jpgbut could not clarify the water as it remained turbid. Further additions upto 2% did not really help.

    The size of Flocs formed were different for each Cleartreat sample.

    I then went ahead and filtered a particular treated liquid sample and what I observed was that most suspended impurity was filtered out, but the filtered liquid was yellow in color. Pic - WhatsApp Image 2020-03-15 at 12.22.38 (1).jpgThe pH of the effluent checked before treatment was approx. 9.5. I did not do any pH adjustment nor did I check the pH of the sample post treatment.

    Any help would be great. Thanks
    Last edited by supersonics29; 03-15-2020 at 02:01 AM.

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