sulfate concentration in domestic wastewater

[bjb]

Is there a "typical" range for sulfate concentration in domestic wastewater in terms of parts-per-million? I need to know so I can determine the type of cement to specify for a wastewater tank that we are doing the structural design for. It is a circular reinforced concrete tank, divided vertically into 2 chambers. The chambers are separated by concrete slab with a 4' diameter hole in the middle. The upper chamber is a clarifer and the lower chamber is a digestor. I currently plan on using type 2 cement, with the addition of fly ash.

 

[dicksewerrat]

Ask your local RCP pipe manufacturer what they use. also see if they make septic tanks. sounds like thast is what you are constructing. You may want to purchase round manhole sections and aslab with a hole in it. Instead of all the form work and steel work. Waht size is this tank?

 

[bimr]

Unless you have some significant industrial discharges (a tannery discharges sulfates for example), the sulfate concentration will be similiar to the concentration in the water supply.

Metcalf & Eddy provides the range of 20 to 50 mg/l Sulfate as typical in untreated domestic wastewater. This concentration should be increased by the amount present in the domestic water supply.

 

[waterexpert]

Everone in the UK specifies "sulphate resisting cement" when building the parts of of wastewater treatment plant which are close to the sewage to be treated, if that helps.

Seán

http://www.wastewatertreatmentplantdesign.co.uk

 

[bjb]

Thanks all for your replies. Type II portland cement is what I am using, which is considered adequate for the sulphate concentration in the sewage for my project. I may also specify some fly ash in the mix too.