EFFLUENT SYSTEMS FOR SINGLE DWELLINGS

Effluent Systems For Single Dwellings

Effluent Systems For Single Dwellings

Introduction

Treatment of concentrated salt laden wastewater in conventional biological processes is a special problem particularly when such water is deficient in organic materials. In urban wastewater treatment, the problem arises especially in the reject water of Reverse Osmosis (RO) process when RO is used to refine effluent of conventional biological processes applied for pretreatment. RO reject content is about 10-20% of its inflow and can constitute large volume of wastewater in centralized treatment systems. Special treatment of such reject water might be necessary to remove nitrogen and phosphorus before its safe disposal in the environment (land/water). This paper addresses the critical aspects of characteristics, inherent problems and special factors to be considered in the treatment of such wastewater. It also explores the possible processes those might be considered to find an acceptable treatment solution. (Anderson & Damann, 2008, 45)

Information on mechanical aeration systems

Floating surface aeration systems add air to ponds, lakes and aerated wastewater lagoons, increasing dissolved oxygen content and supplying micro-organisms with oxygen.

Water Technologies offers a broad range of aeration systems and devices, from fine to coarse bubble, jet aeration, and many other forms of surface or submerged aeration systems.

It is recommended that a suitably qualified installer install wastewater treatment systems; this includes conventional septic tank systems, filter systems and mechanical aeration systems, and the latter two require that polishing filters are also installed. Usually, the manufacturer will recommend a person who is suitable to install the system or may install it themselves. This person is then responsible for the testing of the system after installation, to ensure that it is working effectively. In some cases planning authorities condition that the installation be certified and in this case contact the local authority for more details as to their requirements. (Bauman & Schafer, 2000, 12)

In aerobic wastewater treatment systems, microorganisms feed on organic materials to stabilize them, and reduce biological oxygen demand and suspended solids in the wastewater. The aerators in operation at the Alexandria, Louisiana Wastewater Treatment Plant (WWTP) are a good example of the reliability and longevity of the Aqua-Lator® surface aerator. The 79 twenty-horsepower units are a benefit to the facilities aeration system since some of the floating aerators can be taken out of service for maintenance without impacting dramatically on the overall system. The aerators, mounted on fiberglass floats, operate in two primary and two secondary clay lined lagoons in a modified activated sludge/aerated lagoon system. Operators monitor dissolved oxygen (DO) levels and flow rates to determine how many aerators to operate. Flow rates range from a minimum of 6 million gallons per day (MGD) to a design maximum of 22 MGD, with an average of 11 MGD. The vital key is the simple and disciplined maintenance schedule followed, which includes the inspection of the aerators every six months. The 79 twenty-horsepower units, originally put into service in 1974, have been operating without any major problems or disruptions and have served a community that has ...