Questions tagged [waste-water-treatment]

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

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Question about nuclear wastewater treatment and disposal

This might be a stupid question, I'm not an engineer, and not really sure where to begin to research this. I tried Google but of course it's all biased toward news articles about Japan. So let's start ...
Speeddymon's user avatar
1 vote
0 answers
45 views

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 ...
user57467's user avatar
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4 answers
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Choosing the right pipes for a combination of peristaltic and circulation pump

I would like to circulate the water within an aquarium that contains around 30l water with a circulation pump and an active chiller that contains R134a cooling fluid. New water shall be sucked with a ...
Marco Bobinger's user avatar
0 votes
2 answers
255 views

Is Hetch Hetchy water filtered at all?

I've been reading about Hetch Hetchy drinking water and was surprised to learn that it's not filtered. From Wikipedia: Water from Hetch Hetchy is some of the cleanest municipal water in the United ...
Kevin Workman's user avatar
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1 answer
97 views

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

I'm calculating feasibility of using grey water in high rise buildings to generate hydroelectricity. Let's assume a given water volume of 100 cubic meters a day and a water head of 100 meter. What ...
yon1000's user avatar
1 vote
2 answers
79 views

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 ...
Hell.Bent's user avatar
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-1 votes
1 answer
34 views

Nanofiltration Membranes design understanding

I am doing some research to design a nanofiltration assisted water treatment plant and wanted to know some information on purchasing membranes. I am not sure whether or not these membranes come in ...
Teyash Arjun's user avatar
-1 votes
1 answer
29 views

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

Maybe something cool actually exists. Something clever. I was actually thinking of an hydraulic ram but im not sure it's a good idea. Another thing i saw was a one-way check valve. Would this work?
CuriousGeorge's user avatar
1 vote
5 answers
115 views

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 ...
Felix Lu's user avatar
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0 answers
29 views

What injectors are typically used for mixing sewage sludge?

One typical way to heat sewage sludge digesters is to pump the sludge through heat exchangers, raw sludge is injected before or after the HX. What kind of injectors are typically used for this? I'm ...
mart's user avatar
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1 answer
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What happens to the sedimentation collected in water treatment plants?

The Washington DC water treatment plant appears to use sedimentation tanks for both treating water before consumption and for treating sewage that is then discharged. My question: What happens to the ...
vy32's user avatar
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1 answer
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Is the sewer outfall discharge supposed to have foul odor?

As far as I know a treatment plant's job is to treat black water to become effluent. Part of the process is removing dangerous microbes, grease and other environment damaging substances. However, is ...
Nederealm's user avatar
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1 answer
69 views

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

I understand that the lead ions can be rendered into a precipitate with chloride ions in water treatment, but why on earth does the U.S. still use lead pipes at all when contamination poses an ...
Vane Voe's user avatar
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-1 votes
2 answers
62 views

What are the advantages of wastewater treatment technology that can work in both anoxic and oxic condition?

I was looking at some papers related to moving bed Biofilm reactor and it says that it can be used both in anoxic and oxic condition. So, I want to know what are the advantages of treatment plants ...
Mala Pokhrel's user avatar
4 votes
1 answer
123 views

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 ...
SlydeRule's user avatar
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1 vote
1 answer
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Elution from an Ion Exchange Column

I am using concentrated NaCl(10%) to elute Cobalt (II) ions from a cationic exchange column. How would I determine the volumetric flowrate of regenerant needed to completely elute the cobalt ions from ...
E. Mackel's user avatar
2 votes
0 answers
29 views

Alternative to HDPE Piping for long range sea-water + water transport [closed]

Is there an alternative for the expensive HDPE Piping for long range sea water transport?
mateos's user avatar
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3 votes
2 answers
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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 ...
Kirt Haden's user avatar
3 votes
2 answers
137 views

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 ...
rul30's user avatar
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2 votes
1 answer
8k views

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's user avatar
1 vote
1 answer
2k views

Water vacuum evaporation thermodynamics

A vacuum evaporation system works keeping warm water inside a sealed vessel, which is evacuated with a reversed compressor (or vacuum pump) to keep an inside pressure lower than atmospheric pressure, ...
user3368561's user avatar
1 vote
2 answers
3k views

Open Channel Flow with no slope

I'm struggling to confirm the Velocity in an open channel flow with 0 percent slope. Water enters the channel from an open pipe. The rectangular channel dimensions (66' Long x 3.33' W x 6.75' D) and ...
user10149's user avatar
2 votes
2 answers
472 views

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

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 ...
nowox's user avatar
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1 vote
1 answer
105 views

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

The main raw water has following parameters, water comes from a soap manufacturing factory pH 7.1 BOD 520 mg/L COD 4890 mg/L TSS 360 mg/L No Oil & Grease if you need expected treated ...
Pretty_Girl's user avatar
0 votes
1 answer
104 views

Biological process in wastewater treatment

Biological process is the secondary stage in most of wastewater treatment plant. Is there any wastewater treatment plant without undergoing biological process?
Wendy lly's user avatar
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-2 votes
1 answer
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Disposal of dung, related products, and cleaning products, prioritized and case by case [closed]

This question is a chemical engineering question related to ecology. What is the list of possible threats of human feces to the environment? What about toilet paper? How do engineers deal with this ...
Jack Maddington's user avatar
8 votes
2 answers
104 views

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 ...
Mikkel Bue Tellus's user avatar
1 vote
0 answers
111 views

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's user avatar
1 vote
0 answers
66 views

What is the relation between the Biological oxygen demand and the depth of water tank? [closed]

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 ...
عبيده بني نصر's user avatar
1 vote
1 answer
133 views

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

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's user avatar
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4 votes
1 answer
119 views

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 ...
mart's user avatar
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3 votes
0 answers
64 views

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 ...
mart's user avatar
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