PLEASE READ BACKBGROUND AND EXISTING FACILITIES THEN ANSWER THE QUESTIONS IN DETAIL.

Project background:

Leeds Water Limited $($LWL$)$ operates a wastewater treatment plant that was built in the $1960$s for the town of Jeddah Ali, population equivalent of $12,500.$ Jeddah Ali Sewage Treatment Works $($STW$)$ is an activated sludge treatment plant that treats an average flow of $3\mathrm{.}3$ million litres per day $($Ml$/$d$).$ The plant was commissioned in $2002$ after a conversion from trickling filter to an activated sludge and the current consent that the plant must meet is $25/45/5($BOD$/$SS$/$NH$4)$ on a $95-$percentile basis. In November $2017$; the treatment plant was required to meet an annual average phosphorus limit of $1$ mg$/$l in addition to the current limits for BOD, SS and ammonia. The Jeddah Emirate Council approved the building of a petrochemical plant in the industrial estate close to Jeddah Ali STW$.$ An agreement has been reached with GWL to treat the wastewater from the petrochemical plant at GWL STW$.$ Production is expected to start in September $2016$ with an estimated oily wastewater of $2$ Ml$/$d and a COD of $560$ mg$/$l$.$

Existing Facilities:

Figure $1$ show the top view and figure $2$ the plan view of the existing activated sludge basins at the Jeddah Ali STW$.$ It is a $$pocket ASP$$ design, fully nitrifying plant with anoxic and aerobic basins. There is one $(1)$ anoxic basin, divided into two sections by a baffle wall, followed by four $(4)$ aerobic basins. The basins are run at a maximum design mixed liquor suspended solids $($MLSS$)$ of $3000$ mg$/$l$.$ The plant also has two $(2)12$ m diameter, circular final settling tanks with a net surface area of $225$ m$2.$ The activated sludge process is preceded by fine screens, grit removal and circular primary settling tanks. Table $1$ summarizes the existing secondary facilities.

TASKS:

$1.$ Check the adequacy of the existing plant to cope with the additional loads by investigating the various operational parameters. If not, what could be done to continue to meet consents.

$2.$ Design a new sludge treatment plant to deal with the total sludge and estimate the potential electricity generation from the plant $($make any necessary assumptions and provide justifications$).$

$3.$ Review retrofit options for removing SARS$-$CoV$-2($the virus that causes COVID$-19).$ Prior to the outbreak, most wastewater treatment works were not $$intentionally$$ designed for SARSCoV$-2$ removal. In addressing this, the following points should be considered:

$-$ In what form does the virus exist in wastewater?

$-$ How is the virus detected?

$-$ How is the virus removed from wastewater; and at what point$/$stage in the treatment stage$/$process$?$