MoS2-Graphene Bioenhancer for Low-Complexity Denitrification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biological denitrification technologies face challenges such as high energy consumption, material consumption, and environmental constraints, particularly in the Anammox process, which limits its large-scale application due to the complexity of generating negatively charged sulfur ions and the need for continuous replenishment of raw materials, leading to increased operating costs and waste generation.
Innovation Solution
A bioenhancer based on a molybdenum disulfide composite material, incorporating graphene as an electron conductor, is used to enhance electron input to activated sludge, facilitating improved denitrification efficiency and reducing the need for additional carbon sources and material replenishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pyrite dissolution is used to generate negatively charged sulfur ions for autotrophic denitrification, then the denitrification rate is increased, but the process complexity increases and harsh generation conditions are required
Solution Approach 1:
The patent changes the chemical form of sulfur from pyrite (FeS2) to molybdenum disulfide (MoS2) nanoparticles. This parameter change allows sulfur to be released as S2O3 2- ions under milder conditions without requiring harsh acid dissolution, thus maintaining high denitrification rate while reducing process complexity
Solution Approach 2:
The patent uses molybdenum disulfide nanoparticles as a consumable electron donor that can be easily added to the system. Unlike pyrite which requires complex dissolution processes, the MoS2 nanoparticles directly release sulfur species that are immediately available for denitrification, simplifying the overall process
2Reliability
If sulfur, pyrite and limestone are continuously consumed under acidity, then electron donation is maintained, but raw materials need to be continuously replenished and operating costs increase
Solution Approach 1:
The molybdenum disulfide nanoparticles possess inherent chemical stability and can continuously release S2O3 2- ions through mild hydrolysis without requiring external acid addition or continuous material replenishment. The system becomes self-sustaining, eliminating the need for frequent intervention
3Productivity
If pyrite dissolution is used to generate electrons, then autotrophic denitrification is enhanced, but additional wastes such as precipitation or waste residues are generated
Solution Approach 1:
Instead of generating harmful waste residues from pyrite dissolution, the patent uses molybdenum disulfide nanoparticles that release sulfur species beneficial for denitrification. The mild hydrolysis process produces S2O3 2- ions that directly support microbial activity without creating problematic precipitates or requiring complex waste treatment
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 bioenhancer enhances denitrification efficiency by promoting electron transfer and microbial activity, thereby improving TN removal rates while minimizing operational costs and waste generation.
Implementation Method 1
molybdenum disulfide is used as an electron generation source and graphene is used as an electron conductor, which increases the exogenous electron input of cells in the activated sludge
Implementation Method 2
graphene is used as an electron conductor, which increases the exogenous electron input of cells in the activated sludge
Implementation Method 3
subjecting a solution C containing ammonium molybdate tetrahydrate, thioacetamide, and graphene to hydrothermal treatment to obtain the molybdenum disulfide composite material
Implementation Method 4
subjecting a solution C containing ammonium molybdate tetrahydrate, thioacetamide, and graphene to hydrothermal treatment to obtain the molybdenum disulfide composite material
Data Source
AI summary
The present application provides a bioenhancer based on a molybdenum disulfide composite material, and a preparation method and an application thereof. The main components of the molybdenum disulfide composite material include molybdenum disulfide and graphene, and a ratio of a mass of the molybdenum disulfide composite material to a volume of the activated sludge in the bioenhancer is (1˜100) g:5000 mL; the molybdenum disulfide crystal phase with the above-mentioned enhancement characteristics includes 1T crystal phase and 2H crystal phase.