Prediction of Sulfide Build‐up in Filled Sanitary Sewers

Prediction of sulphide build-up in filled sewer pipes

“…Three models have been referred to by literature as well established sulphide build-up models for steady state condition in filled pipes. [11,12,24] The models are presented in Table 1.…”

“…[8] The empirical nature of the equations and the difficulty in comparing the prediction capability between the equations has been [9] previously commented upon by Holder. [40] After considering all the three models, Pomeroy [8] noted that more information is needed on the effect of the stream velocity. Holder and Hauser [13] also concluded that further research is required to properly delineate the effect of flow velocity on the sulphide production rate.…”

“…[8][9][10] Although these models have been used as the basis for many studies in recent decades, there have been debates about accuracy and consistency of the models. [11,12] Holder [11] noted that neither Pomeroy [8] equation nor Thistlethwayte's [9] equation is adequate for sulphide build-up prediction. He stated that, together with the intrinsic capacity of the slimes to convert sulphate to sulphide, the effects * Corresponding author.…”

Objectives and approach

“…1985 ; Nielsen and Hvitved-Jacobsen, 1988 ; Pomeroy and Bowlus, 1946 ;Holder, 1986;El-Rayes, 1988). This is commonly attributed to two factors : a high SRB population in the biofilm, and an ideal environment for H2S production .…”

“…The results of Nielsen and Hvitved-Jacobsen (1988) confirmed that S04-will hardly ever be a limiting substrate and the Pomeroy-Parkhurst model (equation 1) exclude S04 as model parameter, thus supporting this hypothesis . However, since Thisthlethwyate's model predicts that H2S production follows 0 .4-order kinetics, Holder (1986) suggested that it be attributed to partial penetration of the biofilm as described by equation 40C . A sewer can be modeled in terms of the physical flow and transport of mass, coupled with appropriate reaction rate expressions .…”