This is Version 1.1 of the Blacktown Water Treatment Plant Project Brief.
Title:
Blacktown Water Treatment Plant.
Background:
This treatment plant is designed to remove potentially harmful substances from waste water. It also includes safe effluent discharge and production of agro-ash. This is the process diagram of the treatment plant:
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Process flow - step 1 Preliminary treatment bar screen
Removal of large objects As wastewater enters LMWQCC, it is screened through bar screens for the removal of objects that could damage or interfere with the process and equipment. Chemical addition Ferrous chloride (FeCl2, an industrial by-product), and lime are added to the sewage before it enters the grit tanks, to improve the subsequent chemical treatment process. Grit removal The effectiveness of the chemicals added in the pre-treatment stage is improved by extra mixing in the grit tanks, and by introducing compressed air into the tanks (aeration). The grit (approx 1.5 tonnes/day) is then pumped to a grit classifier where the wastewater is separated, then further treated.
Process flow - step 2 Primary treatment The next stage of treatment takes place in the primary sedimentation tanks. The chemical treatment precipitates phosphates, organics and heavy metals dissolved in the sewage. It is at this stage of the process that polymer is added to cause flocculation (or binding together) of precipitated particles as suspended solids. This assists in settling of the solids to the
