Ecological Remediation of River Sludge Sulfide Pollution
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Solution Overview
Problem
Current methods for addressing sulfide pollution in black and odorous river sludge are inadequate, particularly in controlling acid-volatile sulfide and volatile sulfides like dimethyl sulfide, dimethyl disulfide, dimethyl trisulfide, methanthiol, and hydrogen sulfide, which threaten aquatic ecosystems and water quality.
Innovation Solution
An ecological remediation method involving sludge dredging, solarization, and application of a compound ameliorant mix of slaked lime and iron-ore slag, followed by planting large aquatic vascular plants to create a gentle slope and enhance oxygenation, thereby oxidizing and removing volatile sulfides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chemical reagents are dosed for emergency disposal of sulfide pollution, then the blackening and stink of water are alleviated or eliminated, but the technology cannot further eliminate volatile sulfides like DMS, DMDS, DMTS, MTL and H2S
Solution Approach 1:
The patent segments the sulfide pollution treatment into multiple stages: first using chemical reagents for emergency disposal of H2S, then introducing specialized microorganisms in subsequent stages to eliminate other volatile sulfides (DMS, DMDS, DMTS, MTL). This segmentation allows each treatment stage to target specific sulfide compounds, achieving comprehensive elimination that a single treatment method cannot accomplish.
Solution Approach 2:
The patent changes the treatment parameters by transitioning from chemical oxidation methods to biological degradation methods. By controlling environmental parameters (oxygen levels, temperature, pH) and introducing specific microbial communities, the system adapts to eliminate different types of volatile sulfides that chemical reagents alone cannot address.
2Quantity of substance
If sludge is dredged and stacked on banksides for solarization and ploughing, then sulfide concentrations are reduced by over 60% within months, but land occupation and secondary pollution risks increase
Solution Approach 1:
The patent employs self-service principles by utilizing natural solar energy for solarization of stacked sludge and natural microbial communities for degradation. The system leverages existing environmental resources (sunlight, indigenous microorganisms, oxygen from air and water) to treat the sludge, minimizing the need for additional land area and external inputs while achieving over 60% sulfide concentration reduction within months.
3Productivity
If compound ameliorant mix of slaked lime and iron-ore slag is applied, then oxidation and removal of volatile sulfides is enhanced, but the complexity of the remediation process increases
Solution Approach 1:
The patent applies composite materials by combining slaked lime (calcium hydroxide) and iron-ore slag in a compound ameliorant mix. This composite approach leverages the oxidizing properties of slaked lime and the adsorption capabilities of iron-ore slag to enhance volatile sulfide removal efficiency. The composite material provides synergistic effects that increase the rate of sulfide removal while maintaining a relatively simple application process.
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
This method effectively reduces sulfide concentrations by over 60% within months and up to 80% within a year, improving water quality and facilitating long-term ecological remediation with minimal land occupation and secondary pollution.
Implementation Method 1
stacking the sludge on the banksides for solarization
Implementation Method 2
spraying a compound ameliorant into the sludge during ploughing; said compound ameliorant is a mixer of slaked lime and iron-ore slag
Implementation Method 3
Planting large aquatic vascular plant communities on the banksides after pre-treatment of the contaminated sludge on the gentle slope
Implementation Method 4
An ecological remediation method involving sludge dredging, solarization, and application of a compound ameliorant mix of slaked lime and iron-ore slag, followed by planting large aquatic vascular plants to create a gentle slope and enhance oxygenation, thereby oxidizing and removing volatile sulfides
Data Source
AI summary
The Invention discloses an ecological remediation method for controlling sulphur pollution in black and odorous sludge of rivers. Firstly, the sludge from pollution layer of the rivers will be dredged and stacked on the banksides with slope protection built along the outer edge of the sludge storage site; then innocent pretreatment will be conducted for the sludge. Specific steps comprise solarization and ploughing, and mixed ameliorant of certain proportion will be added for modification between first solarization and intermittent ploughing. Then, large emergent aquatic plants will be planted on the stacked sludge after pretreatment. The technical method provided by the Invention may control the release of acid-volatile sulfide in the contaminated sludge on one hand and reduce concentration of volatile organic sulfide in the waters on the other hand. With simple technical process and strong operable technology, the Invention meets the current requirements for controlling sulphur pollution in black and odorous sludge of rivers in China and facilitates realizing the goal of long-term control of sulphur pollution in the deposit of the waters.