Published by Abdulai Zurukanani Hadi, ASSISTANT TECNICIAN at Ghana Water Company Ltd
We have been encountering settling problem in our clarifiers recently.
The flocs become flaky and light weight. This has been happening at night only. In the day time, they easily settle.
I tried several dosages using the jar test but still couldn't fix it.
any suggestions much appreciated
As you know biological treatment process is very unstable and its reliability in the best of the cases is not higher than 65%.
pH and temp are key factors with direct influence in water treatment but most in wastewater, so are missing more data to supply.
I suggest you our ionic process with reliability is ~95% to solve since root your problem which doesn't have critical parameters from pH neither temp while saving money.
Published by Arturo Constante, Wastewater Purification - Zero Emissions
I would check the DO night vs day. I had a problem at night not enough loading and DO shot right up the high DO and polymer made the tank work like a DAF
Kevin
Published by kevin Cini
It may due to the temperature, in low temperatures the polymer may not mix properly.
Published by Gokul Ragupathi, Marketing and Business Development Executive at Confident Engineering India Private Limited
Can you check the pH of the feed water during day & night time. There might be a variation in pH due to presence of algae. Temperature could be the another reason for difference in performance.
Published by Abilash Srinivasan, Executive Engineer at Osmoflo Engineering Services Pvt Limited
is there a big difference of ther water temperature during day-time and during the night ?
a lower temperature means that the reaction time of the flocculant will become longer = it needs more time to coagulate the flocs , add some extra lengths of piping to have a longer retention time that allows the flocculant to ract properly
Published by Patrick Bogaerts
For the last few days I tried desludging the clarifier throughout the night by trotting the valve as to lose less water.
The turbidity has improved significantly, even though it's not the best.
Published by Abdulai Zurukanani Hadi, ASSISTANT TECNICIAN at Ghana Water Company Ltd
Paul Gaydon
1.the source is from a dam
2.yeah, there is algae
3.we are using polymer
4.yeah, the flow is controlled
Published by Abdulai Zurukanani Hadi, ASSISTANT TECNICIAN at Ghana Water Company Ltd
sampling the wastewater and store in the Lab., and check the different between the sample in Lab. and the wastewater in the plant, is other wastewater into the plant in the night?
Published by Lin JYH-YAN, advanced engineer at FORMOSA PETROCHEMICAL CORPORATION
Actually it's not waste water
Published by Abdulai Zurukanani Hadi, ASSISTANT TECNICIAN at Ghana Water Company Ltd
sorry, but you might sampling the MLSS and store in the Lab, and check the different between Lab and plant, you might also check the SV30 of your samples.
Published by Lin JYH-YAN, advanced engineer at FORMOSA PETROCHEMICAL CORPORATION
I would also consider diurnal oxygen content. If oxygen deficiencies are being experienced overnight, this could create toxic shock, as well as off-gassing with anoxic / anaerobic processes. Generally experienced in wastewater, but not unheard of in water treatment. More info as Paul suggest would help.
Published by Shane Blake, Supervisor at Veolia
Actually it's not waste water
Published by Abdulai Zurukanani Hadi, ASSISTANT TECNICIAN at Ghana Water Company Ltd
Of course temperature affects coagulation processes. You may see the option of polymers to enhance the coagulation.
Published by Dinkissa Kereyu, Civil/Environmental Engineer
Please can you give us some more information:
Published by Paul Gaydon
could be water temp or ph change at night
Published by Mike Mitchell, grade 4 water treatement operator