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Revised Schedule of Fees for Applications made to the South African Heritage Resources Agency (SAHRA)

STELLA BULK SEWER AND INTERNAL RETICULATION

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Status: 

HeritageAuthority(s): 

Development Type: 

ProposalDescription: 

Dr Ruth S Mompati District Municipality is proposing to Develop a Bulk sewer system in Stella located in the North West Province. The site of work is located ± 50km North East of Vryburg which is within the jurisdiction of the Dr Ruth S Mompati District Municipality

Expanded_Motivation: 

Dr Ruth S Mompati District Municipality is proposing to Develop a Bulk sewer system in Stella located in the North West Province. The site of work is located ± 50km North East of Vryburg which is within the jurisdiction of the Dr Ruth S Mompati District Municipality. The proposed entails a development of Stella bulk sewer system and upgrade of the old dams. The development will include a phase B for the entire internal sewer for Stella. This will improve the health and hygiene of the whole Stella community. The development of Stella Bulk Sewer system will be divided into the following 3 portions: 1. Outfall sewer pipelines and sewer pump pipelines 2. Wastewater Pump station 3. Wastewater treatment works The pipeline lengths to be utilized entails: • Rising Main - 200Ø mm – 3 170m • Outfall sewer - 250Ø mm – 1 488m • Outfall sewer - 315Ø mm – 552m • Manholes – 36 The development of the waste water Pump station will entail: • Pre-treatment – Mechanical Grinder • Emergency by-pass hand screen • Concrete Sump – Surface Area – 48m2 – Volume – 181m3 • Emergency Concrete Sump - Surface Area – 65m2 – Volume – 165m3 • 3 X Self priming pumps • Standby Generator • Brick Pump station. The Unit Process at the WWTW will entail: • Anaerobic Pond o Anaerobic Pond o Volume – +- 400m3 o HDPE Lined earth dam • Aeration Basin o Surface area – 1560 m2 o Volume – +- 6240m3 o HDPE Lined earth dam • Clarifier o Surface area – 196 m2 o Volume – +- 686m3 o HDPE Lined earth dam • Maturation / Evaporation ponds o 6 Ponds o Surface area – 5642 m2 o Volume – +- 9590m3 o HDPE Lined earth dam • Sludge Drying Beds o 4 Drying beds o Surface area – 1971 m2 o Volume – +- 887m3 o Concrete Structure • Final water to be irrigated The proposed WWTW includes an activated sludge process which will be able to produce a final effluent to comply with General Effluent Standard requirements The Activated Sludge process will allow for the screening and the de-gritting of the raw sewage, before it is discharged to be treated. The screening consists of one mechanical screen, in a duty configuration. The removed screenings will discharge into a screw press for watering/compaction. The de-gritting consists of one mechanical de-gritting channel, in a duty configuration. The settled grit will be conveyed to be discharged together with the dewatering/ compaction screenings. The Activated Sludge process will lead to the secondary treatment process which is a typical biological nutrient removal process. The Biological process: • The WWTW will consist of an Aerobic pond. The pond provides for aerobic zones, with floating fine bubble aeration equipment. • The pond will be earthen basins, with high quality HDPE sheet lining. • The Waste activated sludge withdrawal will be executed and controlled from the return activated sludge delivery rising main. • Process temperature simulation;= 12 to 22 ºC • General COD inflow concentration;= 864 mg/l • General TKN inflow concentration;= 63 mg/l • General Tot P inflow concentration;= 14 mg/l • General suspended inflow concentration;= 440 mg/l • General sludge age;= 18 – 20 days • Mixed Liquor Suspended Solids (MLSS) operating concentration;= 4000 mg/l Secondary Settling; • The construction will be combinedly HDPE lined, concrete and HDPE baffle walls to ensure, efficient side wall slopes for gravity settlement. The settled sludge will be collected at the bottom with multiple collection hoppers, connected with the suction end of the return activated sludge pump set. • Average design flow;= 1,5 Ml/day • Maximum design flow;= 2,7 Ml/day • Overflow loading at PDWF;= 200 kl/m.day • Retention period at PDWF;= 1.5 h • Up flow velocity at PDWF;= 1 m/h The only sludge produced from the treatment process will be the daily waste activated sludge (WAS) from the secondary treatment process. The WAS will be wasted to the sludge drying beds, via the WAS control bypassing from the RAS pumps discharge pipe line. The sludge drying beds will provide adequate draining via the sand bed and sub-soil drain system, and also solar drying capacity through sufficient surface area exposure. The dried sludge will have to be removed manually and transported to adequate disposal facilities/landfill site. The filtrate (or supernatant) will join the final effluent for irrigation purposes.

ApplicationDate: 

Friday, February 12, 2021 - 11:34

CaseID: 

16069

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Heritage Reports: 

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