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I have a client in Ohio that has requested mutliple day tanks for their coagulant system, even though the only feed point is pre-filtration, no post-feed. They have three solids contact units and the coagulant is being mixed by high-rate induction mixers in open chambers upstream of the SCUs...

We have a project with a new 86" steel pipe penetrating a new large concrete vault. The design called for a pipe sleeve to be cast into the concrete structure and the annular space to be sealed with a modular compression sealing element (e.g. Link-Seal). The vault is about 15 feet underground...

Greetings, I am looking to get some young design engineers engaged in shop drawing review, primarily for water/wastewater treatment plant equipment, piping, valves, and pumps. I was hoping to find an established shop drawing review checklist that will help guide them in their first endeavors...

We are replacing a a very long 42" welded steel pipe header at a water treatment plant with the same. The header is in a gallery (not buried) and carries water from flocculation to sedimentation tanks - this is gravity flow with no bends (probably about 6' driving head). Because of the...

We are replacing a a very long 42" welded steel pipe header at a water treatment plant with the same. The header is in a gallery (not buried) and carries water from flocculation to sedimentation tanks - this is gravity flow with no bends (probably about 6' driving head). Because of the...

I am looking for feedback or reference on the capability (flow rate/static pressure) of pneumatic delivery trucks, in particular for Powdered Activated Carbon. A colleague has questioned if these pneumatic delivery trucks can deliver PAC into a bulk tank where the fill line is submerged 2 feet...

Can someone provide a synopsis on the direct differences between resilient seated valves and metal seated valves (or provide a link to a good site that describes the differences between the two)? What is the primary initiative to choosing one type or another for water (or wastewater) treatment...

I am trying to gather a reasonable engineering explanation as to what truly dictates the use of carrier/feed water in chemical feed applications at Water Treatment Plants. This really seems to be somewhat indiscriminant amongst engineers. Is the basis: - Distance to the chemical feed point...

Didn't get a response on the post in the waste treatment/disposal forum. I am looking for some insight on the real drivers behind why an Engineer or Owner would utilize a scum concentrator as well as heating scum prior to disposal? Is it strictly for larger plants and extreme cold weather...

Looking for some insight on the real drivers behind why an Engineer or Owner would utilize a scum concentrator as well as heating scum prior to disposal? Is it strictly for larger plants and extreme cold weather climates? Does it have to do with the ultimate disposal: recycle to head of plant...

I am attempting to find a good reference source for Raw Water Intake Structure design (rivers, lakes or reservoirs). My inital attempts at the AWWA Bookstore and general internet serach really did not yield much if anything. Any suggestions on where to find design guidleines and graphic...

We are designing for backwash control of a dual media rapid sand filter (18" anthracite/12" sand). We are proposing to utilize a constant speed, 7,500 gpm vertical turbine/lineshaft pump drawing from Clearwell for backwash. Backwash header will have a rate of flow controller (integral...

We are designing for backwash control of a dual media rapid sand filter (18" anthracite/12" sand). We are proposing to utilize a constant speed, 7,500 gpm vertical turbine/lineshaft pump drawing from Clearwell for backwash. Backwash header will have a rate of flow controller (integral...

What conditions typically dictate the use of carrier water in chemical feed applications for Municipal Drinking Water Treatment?

We have a project feeding several traditional water treatment chemicals listed below: Sodium Hydroxide (Caustic Soda) - 50% Sodium Hypochlorite - 12.5% Hydrofluosilicic Acid - 18% Ferric Chloride (coagulant) - 25% I am looking for a source of information to find out which chemicals tend to...

What is a good recommended minimum and maximum velocity to maintain in chemical feed pump suction pipe sizing? Also, is there much concern with drawing 2 - 3 ft suction with typical mag-drive transfer pumps (pump centerline a couple feet above the bulk tarnsfer tank outlet)?

Regarding Chemical Metering Pumps, what type of metering pump(rotary or diphragm)has the best operating history for the specific chemicals listed below (backpressure 100 psi): NaOCl 5.0 gph HFS Acid (fluoride) 1.0 gph Caustic Soda 10.0 gph Ferric Chloride 25.0 gph