Forum for Water and Wastewater Operators

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Answered by nuckfan (1870 pts) 17 hours Ago

what is the maximum time span allowed for sample results before being tied into a drinking water system?

After passing Bacteriological samples in a new piece of pipe, what is the maximum time allowed to lapse before having to re-chlorinate and re-sample before a tie-in proceeds?

distribution-system

regulation

water

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Answered by welcoming screening (140 pts) 1 day Ago

NH4F Treatment

Hello! I work in the semiconductor industry, and I'm curious if anyone has a good summary of the options for treating ammonia/fluoride wastewater blends (from manufacturing reagents such as buffered oxide etch). Fluoride removal via flocculation/sedimentation is well defined, however when ammonia ...

other

treatment-plant

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Answered by Algae (0 pts) 2 days Ago

Surface pump

How does one prime a surface pump?

distribution-system

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Asked by Anubir180 (100 pts) 3 days Ago

Wastewater treatment plant

Wastewater treatment plant Is there any waste that cannot be treated at the plant?what happens to it?

treatment-plant

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Answered by Tamie (39990 pts) 3 days Ago

How far from residential neighborhoods are wastewater treatment plant supposed to be built

regulation

wastewater

wwtp

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Answered by Tamie (39990 pts) 3 days Ago

High fecals with a strong chlorine residual?

At an activated sludge plant every year starting in the fall when weather changes from summer to fall the plant experiences high fecals but the plant has a nice strong chlorine residual, around a 1.5 cl2. Usually the plant does very well with a .8 to 1.0 cl2 any other time of the year. They are...

wastewater

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Answered by Tamie (39990 pts) 3 days Ago

Maganese issues

What could cause maganese to test significantly higher on top of filter? The raw is just below .2 but top of filter reads around .4? Twin claricone clarifiers, thermodyne coagulant, permaganate fed at front of plant.  Need opinions thanks

wastewater-treatment

water

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Answered by Tamie (39990 pts) 3 days Ago

Is there a database with all the water quality reports published by each water utilities?

water

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Asked by Toni Nguyen (100 pts) 4 days Ago

sewage sludge treatment process

Dear All,  Biological waste from animals such as pigs, cows…has been used to make farm soil richer, but using human waste is a challenge. “How to turn sewage sludge from community to safe fertilizer instead of throwing into rivers which causes pollutant environment” - is the big question of go...

wastewater

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Asked by Emilio Vargas (1540 pts) 5 days Ago

Do water utilities have a need to warn homeowners that the home is experiencing continuously running water?

Do water utilities have a need to warn homeowners that the home is experiencing continuously running water ie a leak beyond the meter? We are wondering if partnering with water utilities makes sense for both the utility and us. We are considering providing a data connection for water utilities ...

water

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Answered by Dividing Creeker (1240 pts) 6 days Ago

Water hammer

I would like to know if it is possible that a water hammer occur on a pump suction during the shut off of the pump, given that its flow rate is 3080 GUS/m and that it is equipped with a check valve at discharge?

collection-system

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Answered by Tamie (39990 pts) 6 days Ago

Can class B volumetric pipettes be used when seeding CBODs?

Class B volumetric pipettes are not as precise as class A volumetric pipettes' but I cannot find large bore Class A volumetric pipettes.  CanClass B be used?  I read where large bore pipettes should be used for pipetting seed when doing CBODs, as the larger bore does not stress the seed.

wastewater

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Answered by Tamie (39990 pts) 6 days Ago

what are the purpose of cleaning balancing tank

and the benefit

wwtp

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Answered by Tamie (39990 pts) 6 days Ago

Sshould I shake CBOD sample to get the DO below 9mg/l?

Final effluent DO is 10.57mg/l.  I shook the sample until the DO was approximately 8.78mgI used 4 sample dilutions of 100, 150, 200, and 250mls.  After 5 days the final DOs were all below 0.20mg.When I didnt shake sample that were over a DO of 10mg/l,  I got results that were OK.Why i...

wastewater

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Answered by Tamie (39990 pts) 1 week Ago

How to test oxygen uptake rate and what it’s used for

I want to make sure my MLSS and F/M is is balance

wastewater

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Answered by Tamie (39990 pts) 1 week Ago

Primary Sludge removal In a 5 Stage Bardenpho Process

Trying to find out what other plants practices are for removing and pressing primary sludge from a 5 Stage Bardenpho Process.

wastewater

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5 answers

1 Votes

Answered by BLangloisDB10 (140 pts) 1 week Ago

Meters clogged with lime scale

As an operator of a drinking water utility, I am called upon on a regular basis to resolve problems due to the accumulation of lime scale, particularly for consumers using high-flow meters (DN 30mm) that get clogged. The distributed water is definitely hard: 270-280 mg calcium carbonate/l. ...

distribution-system

water

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Answered by ExpCentrifuge (280 pts) 1 week Ago

Simple analytical method for determining chlorine requirement

We would like to install chlorination systems on borehole sites.To properly size them and ensure we inject the right quantity of chlorine, we need to determine the requirements of the bore water. Our objective is residual chlorine of approximately 0.5 mg/L.We are looking for a simple method that can...

treatment-plant

water

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Answered by Fredo90 (1940 pts) 1 week Ago

Quantity of coagulant needed?

How do you calculate the quantity of coagulant needed for injection to remove phosphates from wastewater?

wastewater

wwtp

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Answered by Tamie (39990 pts) 1 week Ago

where do you sample your aeration tank(MLSS)?

I am curious about the location of the sample point for an aeration tank. I can find no information online about the specific point for sampling.

treatment-plant

wastewater

wwtp

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2 answers

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Answered by Tamie (39990 pts) 1 week Ago

Water treatment plant capacity

Is there a ratio of a city’s water treatment plant daily capacity and the city’s actual daily usage?  Is a one day capacity adequate?  Data I’ve looked at shows most WTPs capacity is 2 to 3 days worth of a city’s daily usage. I’m trying to determine when a WTP’s capacity is insufficient to...

treatment-plant

water

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Answered by Tamie (39990 pts) 1 week Ago

Watewater filtration

Trying to figure out what is the best way to measure filtration productivity. I have found that some say die, but am not sure if that is the proper answer.

treatment-plant

wastewater

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Answered by Tamie (39990 pts) 1 week Ago

How are detection limits established for CBODs

How are detection limits established when performing CBOD analyses

wastewater

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Answered by Tamie (39990 pts) 1 week Ago

How are CBOD results interpreted ? Do the results have to be within a certain percentage of each other to be used?

When CBOD sample is analyzed using multiple dilutions, do the results have to be within a certain percentage of each other to be reported? If so, what percentage, and is this in Standard Methods?

wastewater

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3 answers

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Answered by Pateau01 (1900 pts) 2 weeks Ago

Non-invasive flow meter

We are looking for a non-invasive flow meter for a drinking water network, which can be adapted to a pipe size ranging from 2 to 10 inches.

distribution-system

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Asked by TankThinking (280 pts) 2 weeks Ago

District metering for large-diameter pipe network

We have completed commissioning of DMAs for our distribution network and are now looking at doing the same for our large-diameter water pipes. There is no connection to these lines.Does anyone have any experience specific to the supply network?  Did you user a linear leakage index or another fo...

distribution-system

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Answered by Bonnie (1880 pts) 2 weeks Ago

Meaning of the redox potential in water analysis

I would like to know what the redox potential/ORP means in à water analysis. What does this represent in terms of pollution?

wastewater

wwtp

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Answered by Tamie (39990 pts) 2 weeks Ago

Calculate area of a pond

If one acre contains 43,560 ft, what is the area of the pond in acres?

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Answered by Tamie (39990 pts) 2 weeks Ago

Effects of cold incoming water temperature on wastewater treatment processes

Good day,I was wondering if you could provide me any details, papers, studies, resources, ect. on the Effects of cold incoming water temperature on wastewater treatment processes.Thank you and take care.Sincerely,Joshua Michael

treatment-plant

wastewater

water

wwtp

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2 answers

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Answered by Tamie (39990 pts) 2 weeks Ago

what is good free material to study for a grade 4 abc test?

I'm a wastewater operator looking to pass my grade 4 test. The test is an abc test. does anyone have any suggestions?