Implementation of a municipal wastewater treatment plant in Kuwait utilizing an advanced bio-filtration system with numerous advantages over activated sludge systems
By Dr. Hans Badreddine
In response to local regulations, the Ministry of Public Works in Kuwait City initiated a program to assess the problem of implementing a sewage treatment plant within 100 meters of a residential area at the Hutten Plant in the South Sourra neighborhood of Kuwait City. The problem was on two fronts. First of all, there must be minimal odor emissions. Hydrogen sulphide (H2S) must equal 0 mg/L. The second issue has to do with the handling and general nuisance of sludge within such a close proximity to a residential neighborhood.
Goals and Objectives
The primary goal of this study was to determine how to minimize odor and at the same time virtually eliminate sludge.
The objectives were to identify the latest technologies that can resolve these underlying problems and to identify an overall solution that will also fulfill all the requirements of the Ministry of Public Work in Kuwait City.
Identifying the Problem
A comparison between Activated Sludge Sewage Treatment and a patented Bio-Filtration technology called the Hans BioShaft® System was conducted. As a result of implementation of this municipal wastewater treatment plant system utilizing an advanced bio-filtration system, numerous advantages over activated sludge systems were demonstrated and the Kuwaiti Ministry of Public Works decided to employ the technology. Among those advantages were:
Smaller footprint/land area required Less energy requirements Eliminates sludge generation Enhanced odor control Reduced processing time
As it can be assembled and operational quickly, the technology also is ideal for emergency situations and military uses.
Activated Sludge Technology
Activated sludge treatment has many problems associated with it. Activated sludge plants are expensive to build and occupy substantial land areas. They rely upon utilization of large and costly settling tanks and aeration basins to “settle out” and “digest” biosolids in the waste stream as well as the introduction of bacteria, chemicals, or membranes to treat the sewage and reduce the amount of leftover sludge.
High energy costs are involved in operating most activated sewage treatment plants, due to pumping oxygen into aeration tanks, operating moving screens or filters, etc. Activated sludge treatment plants also produce significant amounts of sludge, that must be further treated and disposed of at tremendous costs. Due to the Hutten plants close proximity to residential areas sludge treatment couldn’t be implanted onsite.
Most importantly the local odor emission regulations requires that no gas or odor emissions may be released within 100 meters of residential areas. The only way that activated sludge treatment can resolve this is through the addition of an odor control system. This won’t only be expensive in equipment, maintenance and manpower, but will also consume a large amount of space and energy.
The Solution
A BioShaft plant produces minimal odor without the construction of an odor control system. This technology encapsulates a sophisticated biofilm and bio-filtration system within a shaft as shown in Figures 1 and 2. The system relies on bacteria that occur naturally in the waste stream to rapidly filter, breakdown, consume and ultimately remove up to 95% of biosolids from the waste stream. The unique design facilitates both the aerobic and anaerobic digestion of waste materials, while at the same time creating and maintaining particularly robust bacteria that aggressively consume biosolids.
