Wastewater renovation using constructed soil filter (CSF): a novel approach

Area of Science:

• Environmental Engineering
• Water Treatment Technologies
• Biotechnology

Background:

• Constructed soil filter (CSF), or Soil Biotechnology (SBT), is a water renovation process utilizing formulated media with microbial cultures.
• CSF integrates sedimentation, infiltration, and biodegradation for efficient wastewater treatment in a single unit.

Purpose of the Study:

• To evaluate the effectiveness of Constructed Soil Filter (CSF) technology for wastewater renovation.
• To assess the removal efficiency of various pollutants including organic matter, suspended solids, heavy metals, and pathogens.

Main Methods:

• CSF operates with hydraulic loading rates of 0.05-0.25 m(3)/m(2) h and organic loading up to 200-680 g/m(2) d.
• The study monitored key water quality parameters including dissolved oxygen, COD, BOD, suspended solids, turbidity, iron, arsenic, and microbial counts.

Main Results:

• Achieved significant reductions in COD (352 to 20 mg/l), BOD (211 to 7.0 mg/l), and suspended solids (293 to 16 mg/l).
• Demonstrated high removal rates for turbidity, iron (5 to 0.3 mg/l), arsenic (500 to 10 microg/l), and coliform bacteria.
• Effluent met WHO pathogen standards (< or =10(3) CFU/100 mL), with increased dissolved oxygen levels.

Conclusions:

• CSF technology offers a low-energy, low-hydraulic retention time (HRT) solution for wastewater treatment.
• Advantages include no pre-treatment, no biosludge production, no odor, and production of fish-compatible water.
• CSF provides an environmentally friendly and sustainable approach to water renovation.