Waste Water Design Options

Question

I am taking a wastewater design class and I need help with design options (two alternatives) for a WWTP that will start accepting waste from a food facility.
The current facility is an MLE denitrification plant. Flow is split into two activated sludge systems followed by two secondary clarifiers and UV disinfection. There are no primary clarifiers.

Sean Roop · Answer

I completely agree that your success lies upstream in the primary treatment.  This dictates how much of the nasty toxic or recalcitrant materials is in the influent to the biomass section.  You need to have a full water analysis of what you are treating.  There a lot of very experienced and knowledgeable people on this site that can provide you with some great advice, but you are putting the cart before the horse.  Once you have the water quality, we can all dream up at least a couple of designs, and then tell you why we would choose one or two over the others.  There are always risks associated with design, especially working off limited data.  There are a number of designs out there, so understanding what you are treating is essential, as well as mitigating any potential future challenges, so you can build in some fail-safe measures.  First concentrate on what can be mechanically taken out prior to the biology (O/G, Solids, Suspensions, toxic and recalcitrant compounds may or may not be taken out depending on how well you design the pretreatment (Primary Clarification), so that the bacteria can acclimate.  Also, you need EQ tanks to be able to control both the organic and hydraulic loading; maintain steady flow with a minimum disturbance to how much and what is being fed to the biology.  Looking forward to seeing what you come up with, so we have design parameters.  Also, very important, is your effluent guidelines.  This will dictate whether you need tertiary treatment for discharge or a potential recycle opportunity to ensure good stewardship and get EPA points for design being BAT at that time.  Best, Sean L. Roop - Senior Water and Wastewater Treatment Consultant - Industrial and Engineering Consultants, LLC

Sean Roop · Answer

You need primary treatment to remove TSS and O/G through a DAF or like.  This will save you headaches.  Consistent feed to the secondary biological system is critical, so make sure you have 2.5-3.5 days of storage at higher flow rates.  Do any toxicity testing ahead of time.  Never hurts to add a couple of tanks for hydrogen peroxide to the system.  1.  One at the DAF to increase the ORP for enhanced coagulation and one at the bios for extra oxygen during high loading.  Plan for a bad day and not wait until you have one.  Hydrogen peroxide loses 1% effectiveness per year in proper storage tank.  If you use 26%, then you can get around reporting as this makes it a class 1 oxidizer.  Jar test many combinations of coagulants and flocculants at both primary and secondary.  Calculate your sludge production to size your dewatering x 1.5 the top of calculation.  Again, plan for a bad day.  You will thank me later.

Rajendrakumar Saraf · Answer

Food processing industries waste water needs special attention simple devices like screens, oil & grease can drastically reduce the organic load.
Equalization, neutralization, sedimentation followed by biological treatment will be simple option
Rajendrakumar V Saraf, FIE, FIWWA
Chairman
Viraj Envirozing India Pvt. Ltd
21, Radhakrishna, Near SBI, Paud Road
Pune 41038
Tel 02015433445, 9822186763
www.virajenvirozing.com

seamus crickley · Answer

Your outline is too vague.
This is a common problem to be addressed at plant upgrade stage. What is your loading and required final quality etc.
I have many such projects. I can send on information if you forward further information to my email scrickley@weweng.ie

Jørgen Sundt · Answer

See waste in water as a way to make Bio gas and use a seperation method to divide CO2 from CH4

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