Hydrex - Activated Sludge Sewage Treatment Plants

Activated sludge process is an aerobic biological process which uses microorganisms to purify the wastewater containing organic matter.

In the basic process, the wastewater, after primary physical treatment, enters the aeration basin where it is mixed with the activated sludge containing a high population of microorganism. The aeration basin content is a mixture of sewage and activated sludge which consists mainly of microorganism and inert suspended solids. The microorganism consume the organic matter as food and convert it into inert material and oxidized end products – mainly CO2 . The treated wastewater is then transferred to a gravity settling basin to separate the sludge. The settled sludge is collected and recycled back to the aeration basin to maintain the desired concentration of microbial population for treatment of the incoming wastewater and the clarified effluent is discharged into the receiving stream.

Because microorganism are continually synthesized in this process, a surplus amount is produced which must be removed from the system to maintain the correct concentration. This is done by discarding a portion of the excess sludge from the system either continuously or intermittently.

Activated sludge process is a highly reliable and efficient means of sewage treatment because it results in nearly total decomposition of organic matter through oxidation and minimizes excess sludge production. Lower sludge production significantly reduces the capital and operating costs associated with sludge treatment and disposal. By utilizing a diffused aeration system for oxygen transfer and mixing, Hydrex plants produce a high quality, clean and clear effluent through a low cost, low maintenance and odor free operation.

Hydrex plants incorporate the most advanced equipment and are designed to meet the strictest air, noise and effluent discharge standards set by environmental protection agencies.

Hydrex plants provide efficient and economical treatment even under the most adverse conditions. Furthermore, maintenance costs are minimized because of such features as non-clog crown diffusers, rotary air blower, ruggedly built equipment, corrosion resistant material and unique plant design.