Water, Sewage & Effluent May June 2019 - Page 35

www.waterafrica.co.za Industrial wastewater treatment Due to the volumes of wastewater produced and the variations in the load, particularly the pH value, wastewater needs to be treated both in the case of direct discharge and indirect discharge. Direct dischargers usually have a biological treatment stage in addition to facilities for neutralisation, oil and grease removal (for example, dissolved air flotation plants) and mixing and equalisation basins. In the case of indirect discharge, the wastewater treatment technology needed depends on regulatory requirements (for example, municipal codes and by-laws). As public wastewater treatment plants are often not designed for high loads, wastewater – such as wastewater produced in dairy processing – must be pre-treated beforehand through an in-house wastewater treatment facility before it is discharged. Pretorius stipulates that analytical measuring processes and devices used here include pH measurement during neutralisation (with CPS11D); oxygen measurement during sludge activation (with COS61D or COS51D); COD measurement in the outlet of indirect dischargers (with CA80COD or CAS51D); or TOC measurement (with CA72TOC). With industry legal demands, shrinking budgets and increasing process complexity, the challenges faced by the water and wastewater industry have never been greater. Endress+Hauser has developed their solutions and service offering with specific industry requirements in mind. Whether you need to update your instrumentation to comply with legal requirements, improve efficiency or streamline your planning processes – Endress+Hauser, as a trusted partner, has the experience and expertise to get the job done.  Water Sewage & Effluent May/June 2019 33 conductivity as a key parameter for assessing water purity; Ceragel CPS71D to regulate the pH value setting; and Turbimax CUS52D to check the efficiency of the filtration process. One of Endress+Hauser’s main goals within the water and wastewater industry is to offer clients reliable and cost-effective solutions. innovations Pretorius says that the food industry requires high-quality water that often exceeds drinking (potable) water quality standards. Whether it’s used as product water, cooling water or for cleaning and hygiene – the importance of pure water in food production cannot be overemphasised. The water quality often directly affects the quality of the product. In enzymatic processes, the pH value is a critical factor. For example, if the pH value of brewing water is too high, this adversely affects the taste and colour of the beer. Minerals and residues dissolved in water impact processing, and cause deposit formation and corrosion on wetted parts. Corroded and lime-scaled piping systems encourage the build-up of dirt and microorganisms and therefore the formation of biofilm. Water that is properly treated, not only ensures high product quality, but also guarantees disturbance free operation and increases system reliability. Depending on the quality of the raw water and the requirements, water treatment is often a multi-step process. A variety of filters, ion exchangers, reverse osmosis and other treatment techniques are used to remove impurities and create purified water. Pretorius says that analytical measuring devices offered by Endress+Hauser are critical in the food industry include devices such as Condumax CLS16D to monitor Digest Utilities in the food industry treatment in food and beverage, mining and petrochemical industries,” says Hennie Pretorius, Industry manager for Water and Wastewater Industries. Pretorius explains that examples from the food industry can be applied just as easily to other industries such as chemical and mining. All these industries use vast quantities of water, which is required to be treated before and after it enters the core processes.