Engineering Stack Exchange
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Questions tagged [waste-water-treatment]

32 questions
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Inexpensive and moderately accurate (field) method of measuring THC (Total Hydrocarbon Content) in water

I am working in a construction company which is building hydropower plants in Northern Norway. We are monitoring the Total Hydrocarbon Content (THC) of our process waste water. This particularly important during tunneling as the machines are likely…
Mikkel Bue Tellus
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Oval aeration tanks - what are they called, what are the key differences in operation to circular tanks?

Consider this overview picture of a WWTP: In the back, you see two oval tanks with bridges and walls, separating an inner from an outer area. These are aeration tanks. Is there a specific reason to build them like this, instead of circular, or is…
mart
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What type of grit separator can be installed between the inlet works and bar screen of a wastewater treatment plant?

An existing sewer treatment plant is experiencing maintenance issues with their first stage (bar screens) where grit which is just barely larger than the apperture (bar spacing) of the bar screens gets jammed in between the bars. I have been tasked…
SlydeRule
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SBR-like reactors without decanters?

Sequencing batch reactors let sludge settle before drawing off the supernatant. For this, decanter arms are often used. An example is here. The challenge is to draw off the supernatant without creating turbulence, which would disturb the sedimented…
mart
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Efficient processing waste water with pigments and dyes to reduce cost

Although ink waste (mixed colors of different inks for printing) is 90% water, separating the inks appears to be problematic. We have tried membranes, RO, electrolysis, boiling, and solidifying with kitty litter. Membranes do not trap the dyes,…
Kirt Haden
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Is it Possible to Generate Power From Sewage Sludge?

I have read about the application of sewage sludge incinerators1 but they do not have a net-positive power-generation. Is there a way to generate net-power from sewage sludge? What are the processes to do so? 1: German:…
rul30
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Alternative to HDPE Piping for long range sea-water + water transport

Is there an alternative for the expensive HDPE Piping for long range sea water transport?
mateos
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Difference between surface loading rate and surface overflow rate of sedimentation tanks

Can anyone please explain to me the difference between surface loading rate and surface overflow rate when used during the design calculations of sedimentation tanks in water treatment plants?
user214671
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Is it better to throw used domestic cooking oil in toilet or within the garbage?

I recently asked a friend how I should recycle my used deep frying oil because I just don't have enough oil to justify taking my car, drive 20 minutes away to the waste collection site for few liters of oil. So my friend advised me to just throw it…
nowox
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Can tritiated water be separated from regular water with a centrifuge?

Tritiated water should weigh more than regular water. Can they be centrifugally separated?
Stephen Collings
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What is the relation between the Biological oxygen demand and the depth of water tank?

I need a relation between Biological oxygen demand and depth. The ultimate [BOD] is known, and I need to calculate a [BOD] at any depth of water tank; temperature is constant. The tank is two meters deep and the incubation lasts seven days. Ultimate…
عبيده بني نصر
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What are best safety practices for visits to waste water treatment plants (WWTP)?

In my position I'll frequently visit wastewater treatment plants, often when refurbishments work happen. What are best practices I should adopt to avoid accidents?
mart
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Solar distillation of sump pump water and the issue of Radon gas

Lately I have been thinking about designing and building a solar-powered water distiller that would be placed close to my house in my backyard. One thought that I have is installing a bypass valve on the pipe coming up from my sump pump so I can…
user57467
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what goes on in this 6 acre water sewage plant?

This water sewer plant is about 1/4 mile from vacant rural lot I own. With no particular weekly pattern I occasional hear what sounds like a large generator or pump faintly in the distance. From this image, can somebody explain what they might be…
Hell.Bent
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Magnetic treatment of hard water to prevent scale and corrosion? How does this work?

I ran across this company at their booth at a Tradeshow (2018). They claim to have a chemical free (and as far as I can tell - a power free) treatment method for hard water to minimize scale and corrosion effects downstream. My intuition tells me…
Felix Lu
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