“Wastewater Neutralization” Instalation

Operating principle:

The system is designed to purify and bring industrial wastewater, from various stages of production at an appropriate pH content requirement and environmental standards in force, before it is release into drains. The system performs in the filtering process the pressing of the resulting sludge and the recovery of valuable components such as copper, zinc, aluminum, chromium, etc.

The principle consists in successive dosages of hydrochloric acid, lime, caustic soda, flocculants and other chemical components, after a well-established recipe with the possibility of amending it so that all the compounds in wastewater are neutralized. Sediments are effectively eliminated, water becomes clean, providing output pH and content of harmful compounds to the parameters required by environmental regulations.

 Modes of operation:

The instalation can contain neutralizing continuous flow lines in which the water cycle is continuous, entering water being neutralized while passing through many pools of neutralization and neutralization lines in charge, in which wastewater is stored in pools and inserted in charge to fill storage tank, neutralization being made in consecutive batches.

The system can operate automatically, a mode in which all decisions are taken by the automatic control of the installation depending on the chosen neutralization line and in manual mode, the system can make checks and adjustments of the neutralization process.

According to the guidelines, each neutralization line can be switched on and off thus ensuring the possibility of processing wastewater from several parts of the production process, simultaneously or individually.

Functional safety:

The process achieves a performance indicator and warning of dangerous situations, by cumulating failure warnings in a warnings list, with display of date and time, their disappearance and audible signals when they occur.

The list of faults is stored in a “.csv” on PC and can be accessed and printed making process history for long periods of time.

Comfort and ease of use:

Each stage of the process and pH values are shown in real time and stored in process lists that can be accessed both on the PC viewer, and in a “.csv” file, logging the history of the instalation’s parameters in time.

Automation is ensured by a Siemens ”Step 7″ series programmable controller and S300 digital and analog modules, which monitor and control the entire process of neutralization.

With the graphic touch screen and SCADA program under  “Siemens Flexible 2008 Runtime” licence,  viewing, control and HMI interaction with the installation is made posible.


Automation cabinets are made with Schneider Electric devices , providing a high robustness and a very good reliability.