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Engineering Stack Exchange

Questions tagged [waste-water-treatment]

Use this tag for questions relating to either Physical/Chemical or Biological treatment of wastewaters

This tag is used for questions specific to the Physical/Chemical or Biological treatment of wastewaters and their processes.

36 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?
striker10
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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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How to determine optimal DO and ORP sensor placement for a carousel-type oxidation ditch with fine bubble aeration

I’m working on a senior project that involves giving recommendations for the placement and control strategy of Dissolved Oxygen (DO) and Oxidation-Reduction Potential (ORP) sensors in an oxidation ditch system used for biological wastewater…
TASNIM OUESLATI
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Is there a water quality standard for CIP (cleaning-in-place) that mention a specific value of water parameter (silica, calcium, magnesium, pH,..etc)?

In my company we already use RO water for CIP. Because there is an environmental permit issue regarding the effluent amount limit outside plant, i try to look up the possibility of using softener water for CIP instead of RO. The purpose is to reduce…
Fajrh
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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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Optimal Methods for Reducing Nitrogen Concentration from 16 mg/L to 9 mg/L in Treated Wastewater prior to entering an RO membrane

I am currently working on a project that involves reducing nitrogen concentration in water from 16 mg/L to 9 mg/L. I am looking for the most effective and efficient methods for nitrogen removal, particularly in terms of practicality and…
Kiana Jebelli
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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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