3 votes
Accepted

What happens to the sedimentation collected in water treatment plants?

I was part of a team of contractors to remove and spread the dried sediment from a water treatment facility - the sediment was a red cake/ powder and was spread on the fields as fertiliser.
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  • 13.6k
2 votes
Accepted

Disposal of dung, related products, and cleaning products, prioritized and case by case

The main issue is the spread of pathogens, human faeces can harbour some nasty diseases, notably e-coli, hepatitis and cholera. Accumulation can also provide an environment where pathogens can survive ...
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2 votes

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

The only or vastly major source of chemical oxygen demand (COD) should be your dissolved or suspended hydrocarbons, so a COD test could be the way to go. . I don't know hw confident you are in your ...
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  • 4,616
2 votes

Open Channel Flow with no slope

My open channel hydraulics are a little rusty having ended up in project management for a few years. Assuming sub-critical flow, i.e. the Froude number is less than 1. This is reasonable unless the ...
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2 votes

Is it better to throw used domestic cooking oil in toilet or within the garbage?

Option 4: Put it in the container, leave it on your doorstep and offer it for free on craigslist. You will likely find someone that regularly needs it and you can just email/text message them any time ...
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  • 7,444
2 votes
Accepted

Why does the U.S. still use lead pipes?

Lead pipes have not been used in new construction in the USA for many decades. The problem is with old buildings and old water lines which may still be equipped with lead pipes if they have not been ...
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2 votes

Difference between surface loading rate and surface overflow rate of sedimentation tanks

I'm not 100% familiar with english terms of art. However, according to this document, they are the same: The surface loading rate is a hydraulic loading factor expressed in terms of flow per ...
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  • 4,616
2 votes
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what goes on in this 6 acre water sewage plant?

Looks like a wastewater treatment plant, there are a few different ways water can be treated. If you're not in a large metro area the plant doesn't need to be too large. Water comes into one pool, ...
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  • 2,402
2 votes

Magnetic treatment of hard water to prevent scale and corrosion? How does this work?

There's very little data available to evaluate these claims. The manufacturers tend to rely on anecdotal information and testimonials rather than hard data, and no-one else really has any incentive ...
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  • 1,012
1 vote

Calculating flow rate from a given water tank and water head in hydropower

Let's assume a given water volume of 100 cubic meters a day and a water head of 100 meter. 100 m3 = 100 T = 100,000 kg. That's a lot of weight and a lot of valuable space in a high rise building. ...
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  • 7,479
1 vote

Nanofiltration Membranes design understanding

It appears the membranes are available without pressure vessel (which could be a piece of pipe, probably DN125) but since the company does turn key isntallations too you could probably procure a pre-...
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  • 4,616
1 vote

I need a valve siphon or device to empty a boat that doesnt need a battery or power

You can buy a mechanical pump that you work by hand for this purpose. It has a cylinder with a piston inside, a suction hose, and a discharge hose. You dip the suction hose into the bilge water, aim ...
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1 vote

Water vacuum evaporation thermodynamics

The temperature sounds correct, the energy balance does not. I get 405°C for the compressor discharge but the enthalpy increases from 2547 kJ/kg to 3289 kJ/kg, for a work input to the gas of 743 kJ/kg,...
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1 vote

What type of grit separator can be installed between the inlet works and bar screen of a wastewater treatment plant?

The OP wrote they use a Huber screen. Huber often uses bars that are hydraulically optimized bars with a profile like the left one in the picture: These have a slight funnel effect, so if d = 7mm, a ...
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  • 4,616
1 vote

Efficient processing waste water with pigments and dyes to reduce cost

many dyes and pigments can be decomposed by buffering the ink to either acid or base, depending on their molecular structure. you can then dewater the resulting effluent with the right RO membrane.
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1 vote

Is it Possible to Generate Power From Sewage Sludge?

In order to make use of it as a fuel, you could consider these options: - Processing the stuff with micro-organisms like bacteria that can create methane from it, or other usable fuels. - Drying it ...
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  • 1,164
1 vote

Is activated sludge process efficient for industrial waste water treatment ? why if isn't?

The BOD/COD ratio of this wastewater is low enough that it would be impractical and most likely toxic to the microbiology of an activated sludge process. Here is a good review of the general ...
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  • 21
1 vote

Biological process in wastewater treatment

It all depends on what is in the waste water, and how much is allowed to be left after treatment. Treatment can mean anything from a settling tank, to a filter or screen, to oxygenating, to ...
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  • 11.2k
1 vote

What are best safety practices for visits to waste water treatment plants (WWTP)?

Some practices include: Announce visit to staff and inquire about potential hazards watch out for traffic watch out for machines that start on their own don't run, becareful around ladders etc, ...
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  • 4,616
1 vote

Oval aeration tanks - what are they called, what are the key differences in operation to circular tanks?

Those are called oxidation ditches. They are aerated mechanically in the center where the bridge is located. The length of the channel and the overall size of the process are functions of required ...
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  • 11

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