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Hey, Team, Had a 40 hp PD blower lock down from lack of oil. Used 1.5 gallons of oil in 1 year. No evidence of leakage. Would a blower conceivably use 0.5 ounces of oil per day, sending it out with the air? There is a question of whether the blower was ever actually filled with oil, though...

Hi, gang! I am working on a WTP design including new High Service pumps. A former operator told the client that he should insist on cast iron pump heads, that fabricated steel ones would ultimately deform or flex and cause problems. Any thoughts? Thanks!

We have a duckweed problem in a 70 ft clarifier. The clarifier is extremely underloaded - 50,000 gpd in a 70 ft clarifier. The flow is from a college student development and the plant is a former textile industry WWTP. The duckweed grew when the clarifier was pumped down for maintenance and...

I noticed on a set of plans that the engineer is calling for 8" PVC solvent welded pipe for an underground sewer service line for an industry. I confirmed that he meant this on purpose and asked him what the thinking was, since bell and spigot joints seem to be more common for this diameter. A...

The diffuser in the attached photo is part of an effluent sand filter. The filter has a filter plate into which the diffuser is attached so that the diffusers are the only means by which water can get from one side of the filter plate to the other. The sand and anthracite sit on the filter...

I'm working on a feasibility study for a WWTP for an industrial park at 0.5 mgd. Any input on a good technology for taking on various industrial wastes. Stream discharge. Effluent limits 5BOD, 5 TSS, 0.5 summer ammonia, 0.5 TP. Thanks.

We are wanting to eliminate the usage of gaseous chlorine and sulfur dioxide at a 2.5 mgd lagoon WWTP. Are you aware of successful installations of UV for this application? What are the concerns? Any feasible alternatives? We will have a TSS limit of 45 mg/L.

I am designing a drainfield that will receive backwash water from a resort area swimming pool - 300 gpm for 5 minutes twice a week. Other than buffering the flow into the drainfield, should anything else be done to treat the backwash water to remove solids? Are there enough solids to be a...

I'm selecting safety signage for an alum bulk tank. Should the sign say, "Danger - alum", "Caution - Alum" or just "Alum"? Where are the standards for this? Thanks.

Hi, folks, I am going to be doing some jar testing to remove BOD/ COD from an industrial waste stream. BOD is about 1200 mg/L, COD 2000 mg/L. Need to knock this down to 300 mg/L BOD, 750 mg/L COD. Waste stream is small (5,000 gpd), so we're trying to avoid biological if possible. We're...

We are working on a 1 mgd activated sludge plant that has a 6 month rolling average pound limit for phosphorus. No concentration limit. The plant presently meets this limit without P removal, but could in the future have to remove some P to meet compliance if flow increase. We plan to add...

I'm trying to find out how much phophorus I might expect in landfill leachate and also in the water from dewatering sludge that comes from domestic package WWTPs. Any help or ideas? Thanks

We are looking at designing a 45,000 WWTP for a hospital in Latin America. I am concerned about the potential effects of quaternary ammonium sanitizers, antibiotics, and other hospital wastes that could give real problems in the treatment process. Are there any ways to design in protection...

We have a 1.25 MGD domestic wastewater extended air plant and will need to meet a 1.8 mg/L T-P limit. Can we meet this by alum addition ahead of the clarifiers without filtration? Thanks

What concentration of total nitrogen should we expect in the effluent of an extended air activated sludge plant? We will be nitrifying, but not denitrifying. Ammonia limit is 4 mg/L. We need to estimate total N for land application. Thanks.

We are planning to add alum for P removal into the splitter box upstream of two proposed clarifiers. The pipe from the splitter box is presently proposed to be DIP. (The clarifiers have not been constructed yet.) Are there any corrosion concerns? If we changed the DIP to PVC would there be...