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Questions tagged [waste-water-treatment]

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1answer
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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 ...
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1answer
55 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 ...
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2answers
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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 ...
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1answer
57 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 ...
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1answer
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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 ...
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0answers
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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?
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2answers
35 views

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 ...
3
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2answers
77 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 ...
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1answer
2k 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?
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1answer
323 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, ...
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2answers
634 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 ...
3
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2answers
95 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 ...
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1answer
86 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 ...
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1answer
55 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?
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1answer
33 views

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 ...
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2answers
76 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 ...
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0answers
50 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?
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0answers
61 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 ...
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1answer
121 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?
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1answer
88 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 ...
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0answers
50 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 ...