Alkali Treatment for Selective Nitrification Sludge
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Solution Overview
Problem
Existing methods for wastewater treatment using nitrite type nitrification-reactive sludge require high energy for heat treatment or frequent acid treatment, leading to increased costs and potential damage to the carrier, which can decrease nitrification reaction rates and complicate the process.
Innovation Solution
An alkali treatment method is employed to maintain a pH of 10 or higher in activated sludge, selectively deactivating nitrite oxidizing bacteria while preserving ammonium oxidizing bacteria, thereby reducing energy costs and preventing carrier damage, and allowing for stable and simple wastewater treatment without the need for neutralization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat treatment is applied to the carrier to deactivate nitrite oxidizing bacteria, then ammonium oxidizing bacteria are accumulated with higher priority, but a large quantity of thermal energy is consumed
Solution Approach 1:
The invention changes the treatment parameter from thermal (heat treatment) to chemical (alkali treatment with pH 10 or higher). By adjusting the pH parameter instead of temperature, the patent achieves selective deactivation of nitrite oxidizing bacteria while preserving ammonium oxidizing bacteria, thereby resolving the contradiction between selectivity and energy consumption
2Reliability
If acid treatment is applied to the carrier to accumulate ammonium oxidizing bacteria, then heat treatment is avoided, but the mechanical strength of the carrier deteriorates and nitrifying bacteria may flow out
Solution Approach 1:
The invention changes the treatment parameter from acidic (pH lowering) to alkaline (pH 10 or higher). This parameter inversion resolves the contradiction by achieving selective bacterial deactivation without the harmful side effects of acid treatment on carrier mechanical strength
3Reliability
If periodic acid treatment is applied to maintain selectivity, then ammonium oxidizing bacteria are accumulated, but the process becomes complicated and carrier strength deteriorates
Solution Approach 1:
The invention uses a single alkaline treatment step (pH 10 or higher) to achieve both selective deactivation and long-term stability, eliminating the need for periodic treatments. This resolves the contradiction by simplifying the process while maintaining reliability
Solution Approach 2:
The alkaline treatment is applied as a preliminary action to establish a stable microbial community structure before waste water treatment begins. This initial treatment creates lasting selectivity without requiring subsequent periodic interventions, thereby reducing process complexity
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 alkali treatment method effectively accumulates ammonium oxidizing bacteria with higher priority, reducing oxygen and hydrogen donor requirements, maintaining nitrification reaction rates, and simplifying the treatment process, while lowering energy consumption and avoiding carrier deterioration.
Implementation Method 1
subjecting activated sludge to alkali treatment so that the pH of the activated sludge containing at least the ammonium oxidizing bacteria and nitrite oxidizing bacteria can be 10 or higher
Data Source
AI summary
A method for producing a nitrite type nitrification-reactive sludge includes the step of subjecting an activated sludge to alkali treatment so that the pH of the activated sludge containing at least the ammonium oxidizing bacteria and nitrite oxidizing bacteria can be 10 or higher, in order to accumulate ammonium oxidizing bacteria with higher priority in the activated sludge.