Compacted Coconut Mesocarp Biofilter for Wastewater Purification
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Solution Overview
Problem
Current wastewater purification systems using coconut mesocarp biofilters are inefficient in reducing BOD, TSS, and COD to acceptable levels for discharge into surface water sources, and are costly due to high maintenance and microorganism carrier material costs.
Innovation Solution
A biofilter with a compacted first layer of coconut mesocarp pieces with a mean particle size of at least 1 cm and a density of 75-275 kg/m³, optimized for water permeability and microbial activity, combined with a second drainage layer for efficient water flow and aeration, and pH control agents to maintain optimal growth conditions for microorganisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coconut mesocarp biofilter is used for wastewater purification, then mechanical filtration and microorganism carrier functions are achieved, but purification efficiency is insufficient and BOD of purified water remains high
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size distribution of coconut mesocarp material (combining fine particles <3mm with larger fragments), adjusting the density of the filtration bed (75-275 kg/m³), and controlling the thickness of different layers. These parameter optimizations enhance both mechanical filtration capability and microorganism carrier function, achieving sufficient purification efficiency while reducing BOD of effluent to acceptable levels.
2Reliability
If coconut mesocarp material is used as filter material, then water and fertilizer holding power is improved, but cost of microorganism carrier material increases
Solution Approach 1:
The patent optimizes the density parameter of coconut mesocarp material to 75-275 kg/m³, which balances water holding capacity with cost effectiveness. This parameter range ensures sufficient porosity for water retention and microorganism growth while avoiding excessive material costs, making the system economically viable for decentralized wastewater treatment.
3Productivity
If intensive aeration is applied in purification tanks, then aerobic fermentation is enhanced, but device complexity and operational costs increase
Solution Approach 1:
The patent employs a self-service approach where the compacted coconut mesocarp filtration bed naturally provides aeration through its porous structure. Air flows through the voids between particles without requiring mechanical aeration equipment, enabling aerobic fermentation to occur naturally. This eliminates complex aeration systems while maintaining high purification efficiency through the biological activity of microorganisms colonizing the mesocarp material.
4Reliability
If filtration bed density is increased to reduce microorganism washout, then carrier stability is improved, but water permeability decreases
Solution Approach 1:
The patent identifies and applies the optimal density parameter range of 75-275 kg/m³ for coconut mesocarp material. Within this range, the filtration bed achieves sufficient compactness to prevent microorganism washout during water flow, while maintaining adequate porosity and void spaces for water permeability. This parameter optimization resolves the contradiction between carrier stability and water flow rate.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves significant reductions in BOD, TSS, and COD, meeting regulatory standards for surface water discharge, while minimizing microorganism washout and extending filter lifespan, with reduced operational costs and natural microbial growth without additional nutrient supply.
Implementation Method 1
Coconut mesocarp is used for its ability to retain particulate matter and to act as a growing medium for micro-organisms
Implementation Method 2
water permeability and microbial activity
Implementation Method 3
the activity of micro-organisms which are responsible for the biological purification of the water
Implementation Method 4
efficient water flow and aeration
Data Source
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AI summary
This invention relates to a device for the purification of organically polluted wastewater, comprising at least one biofilter (1) for the wastewater purification, which biofilter comprises a bioactive bed with a first layer (3) comprising coconut mesocarp pieces, the device further comprising a water supply (13) for supplying waste water to be purified to an upper part of the biofilter at a position above the first layer and a water collector (15) for collecting purified water from a lower part of the biofilter at a position below the first layer, whereby the mesocarp pieces of the first layer have a mean particle size of at least 1 cm, in that the first layer is compacted.