Pilot investigation on the treatment of fertilizer manufacturing process effluent using lime and electrodialysis reversal
✍ Scribed by J.J. Schoeman; I.J.M. Buys; I.B. Schutte; H. Macleod
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 919 KB
- Volume
- 70
- Category
- Article
- ISSN
- 0011-9164
No coin nor oath required. For personal study only.
✦ Synopsis
The treatment of a fertilizer company's effluent was evaluated using lime and electrodialysis reversal (EDR) for phosphate removal, water and chemical recovery, and effluent volume reduction.
Phosphate could be reduced from 3 800 to less than 50 mg/l at pH 8.5 with lime: however, phosphate removal from the lime treated effluent using EDR was poor (75% removal). The EDR product water complied with the requirements for cooling tower make-up except for TDS and phosphates.
However, the required specifications should be met using 10 stage EDR.
In addition, plant nutrients (NH4+ ,N03-) may be recovered from the brine, which comprised 20% of the initial effluent volume. Membrane scaling was virtually absent.
A full scale EDR plant should run well with electrical adjustments and/or frequent acid cleaning. Electrical energy consumption for EDR treatment was found to be 4.5 kWh/m3 feed (pumping costs excluded). The capital cost for a 30 ml/h EDR plant and clariflocculator (PO4 removal) was estimated at US $750 000.