H3-VH-8B flender tianjin Helical gear boxes H3

Flender/Flender Gear Units/Helical gear boxes H3

cken WAS. Supernatant from the thickeners flows to the liquor treatment tank Two anaerobic digesters that digest thickened primary sludge and WAS Five belt presses that dewater digested sludge. Dewatering liquor from the belt presses is pumped to the sludge liquor treatment tank Sludge liquor treatment that consists of precip itation tank and two thickeners. Lime is dosed to precipitate excess phosphorus from the liquors. Effluent from the precipitation tank is 4-7 thickened in the sludge liquor thickeners with the supernatant pumped to the balancing tanks and the underflow to the digested sludge holding tank that feeds the belt presses. Solar drying for drying digested sludge cake. The dried sludge is made available to external contractors who will compost it to produce final product that can be used for soil conditioning Some of the biogas is currently us ed to heat the boilers that provide heat for heating the digesters. Excess biogas flared. There are plans to install CH engine that will utilise the biogas to generate electricity that can be used at the plant 4.2.8 Overall Plant Control System The plant has various localised PLCs and centralised Supervisory Control and Data Acquisition (SCADA) system. Major plant processes are monitored and cont rolled by local PLCs providing full automation to some of the processes. In addition an online auto-analyser that automatica lly measures Ortho , Nitrate, Nitrite and Ammonia and specific absorbance coefficient (SAC) was inst alled. According to 2 records the auto-analyser measures values from the following streams: Reactors 1, 3 and 4 effluent Combined final effluent 4.3 FINAL EFFLUENT DISCHARGE PERMIT REQUIREMENTS Final effluent is discharged to Roodeplaat Dam and is required to comply with the DWSs licence No. 2/2/2/2/A2/1/8. summary of the limits fo the main parameters is given in Table 4-2. Table 4-2: Final Effluent Discharge Paramete Limits for Zeekoegat