Wastewater Sludge Dewatering via Hydrogen Peroxide Cell Lysis
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Solution Overview
Problem
Conventional wastewater treatment processes produce discharge activated sludge with high water content, leading to increased volume and disposal costs due to the retention of water within microbial cell walls.
Innovation Solution
The method involves adding a hydrogen peroxide source to the discharge sludge stream to lyse microbial cell membranes, followed by dewatering to produce a sludge cake and a sludge liquid portion, optionally using a flocculant to enhance separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional dewatering is used on discharge activated sludge, then the sludge can be separated into cake and liquid portion, but the sludge retains significant water within cell walls leading to high volume and mass for disposal
Solution Approach 1:
The patent applies parameter changes by introducing hydrogen peroxide to alter the chemical state of microbial cells in the sludge. The hydrogen peroxide causes cell lysis, changing the physical-chemical parameters of the sludge system and enabling water release from cell walls that conventional dewatering cannot achieve.
Solution Approach 2:
The patent replaces purely mechanical dewatering systems with a chemical treatment approach using hydrogen peroxide. Instead of relying solely on mechanical forces to separate water from sludge, the solution uses chemical action to break down cell structures and release bound water, thereby improving dewatering effectiveness.
2Loss of energy
If the volume and mass of discharge sludge are reduced, then disposal costs decrease, but this requires additional treatment steps beyond conventional dewatering
Solution Approach 1:
The patent employs hydrogen peroxide as a strong oxidant to accelerate the breakdown of microbial cell structures in the sludge. This oxidation process rapidly lyses cells and releases bound water, achieving significant volume and mass reduction that translates to lower disposal costs despite the addition of a chemical treatment step.
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
Reduces the volume and mass of the discharge sludge for disposal by releasing water from microbial cells, thereby decreasing disposal costs and potentially utilizing the released water separately.
Implementation Method 1
A peroxide source is added to the discharge sludge stream... rupturing a microbe cell membrane with hydrogen peroxide
Implementation Method 2
the discharge sludge stream is dewatered to produce a sludge cake and a sludge liquid portion
Implementation Method 3
adding a hydrogen peroxide source and a flocculant to the discharge sludge stream
Data Source
AI summary
Methods for treating wastewater and dewatering a discharge sludge stream are provided. In an exemplary embodiment, a method for treating wastewater includes adding oxygen to a wastewater to produce a treated wastewater, and separating a wastewater sludge stream from the treated wastewater. The wastewater sludge stream is split to produce a recycle sludge stream and a discharge sludge stream, and the recycle sludge stream is added to the wastewater such that the oxygen is added to the recycle sludge stream and the wastewater. A peroxide source is added to the discharge sludge stream, and the discharge sludge stream is dewatered to produce a sludge cake and a sludge liquid portion.