Rietspruit | Print |

Background

 

Riespruit WWTW was built in 1952 and subsequently upgraded in the 1970’s. The plant currently has a design capacity of 36Ml/day and has an operational capacity of 30Ml/day. The plant serves an approximate population of 125, 000 and is impacted by the cities/villages; Vanderbijlpark, Boipatong, Bonnane, Bophelong and Muvhango.

Problem

A problem was identified at Rietspruit WWTW and an enquiry was directed to the ICM team at Arch Chemicals.  The discharge water from the treatment plant was problematic in that the bacterial levels and free chlorine readings were out of specification. An investigation was conducted and it was found that the plant design is as such that during low flow/peaks, the water supply to the chlorine gas dosing installation is insufficient and hence no chlorine dosing is administered, subsequently resulting in highly contaminated discharge.

 

Solution

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Fig,1 Industrial Chip Doser 1 • Fig.2 MSDS and safety board

 

Two HTH® 180kg Industrial chip dosers were installed on site. The units make use of the existing infrastructure, with no power or pumps necessary, which make the unit ideal in this area, which is prone to frequent power outages. The units make use of HTH® Scientific Chips in order to chlorinate the effluent, and thereby rendering the effluent treated and safe to discharge into the river systems.

 

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Fig.3 Industrial Chip Doser 2  • Fig. 4 Discharge point

 

The unit was commissioned and tests were conducted. Running at just 15% of its design capacity, the chip dosers yielded a free chlorine residual at the discharge point 1km from contact of 1.8ppm. The units were fine-tuned to achieve desirable discharge values.

 

Technical Information

  1. Designed to suit harsh industrial conditions. 
  2. No electricity needed. 
  3. Simple effective dosage to virtually any size reservoir and/or WTW. 
  4. Capacity/feeder = 180kg HTH® Scientific Chips. 
  5. Feed rate = ±30-kg HTH® Scientific Chips per hour per feeder. 
  6. Flow rate through feeder = 50 – 4000 liter water per hour per feeder. Double rotameter system - 2000 liter maximum flow per rotameter.

Benefits

  1. No handling of liquid chemicals. 
  2. Tailor made for every application need. 
  3. No electricity needed; gravity feed. 
  4. Low risk installation. 
  5. Easy, cost effective installation. 
  6. Continuous chemical dosing ensures safe drinking water. 
  7. The HTH® Industrial feeder has proven reliability. 
  8. Dosage can be regulated with flow through rotameter.

 

To learn more about the proven advantages of the HTH® Controller, Pulsar® System or HTH® Chips, please contact the ICM Group on +27 (11) 393 9000 or visit our website at www.hthscientific.co.za
 
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