Soil Washing System with Flotation and Up-flow Purification
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Solution Overview
Problem
Existing washing treatment systems for contaminated soil, particularly those addressing dioxins and agricultural chemicals, face challenges in achieving sufficient contaminant removal due to the type of soil, leading to inefficiencies in purification processes.
Innovation Solution
A washing treatment system and method that includes a classifier to separate soil fractions, a detaching/washing unit using a scrubber with a stirring tank and blade to remove contaminants, a removal unit generating air bubbles with a flotation chemical to form froth, and an up-flow washing unit to further purify the soil, along with a water treatment unit using an adsorbent to treat dissolved contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional washing treatment systems are used for contaminated soil, then the system structure is relatively simple, but the contaminant removal efficiency is insufficient
Solution Approach 1:
The washing treatment system is divided into multiple functional units: classification unit (separating sand fraction from fine-grained fraction), detaching unit (scrubber with stirring blade), removal unit (flotation tank with air bubble generation), and up-flow washing unit. Each unit performs a specific function to progressively remove contaminants, achieving high removal efficiency through staged processing rather than a single complex step.
Solution Approach 2:
The classification unit performs preliminary separation of soil fractions before the main washing process. By pre-separating the sand fraction (which contains most contaminants) from the fine-grained fraction, the subsequent detaching and removal operations can focus on the contaminated portion, improving overall efficiency while maintaining manageable system complexity.
2Productivity
If more washing treatment units are added to improve purification efficiency, then contaminant removal improves, but system complexity and operational difficulty increase
Solution Approach 1:
Multiple washing functions are merged into integrated units. For example, the removal unit combines flotation chemical addition, air bubble generation, and froth removal in a single tank. The up-flow washing unit integrates upward water flow and particle separation. This merging reduces the number of separate operational steps and interfaces, making the system easier to operate despite its high purification capability.
Solution Approach 2:
The system utilizes natural physical processes to reduce operational complexity. Air bubbles naturally rise to form froth that carries contaminants to the surface for removal. The up-flow washing unit uses upward water flow to naturally separate particles by density. These self-service mechanisms reduce the need for complex control systems and manual intervention, maintaining ease of operation while achieving high productivity.
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 approach ensures more effective removal of contaminants from contaminated soil, improving the efficiency of the purification process and reducing the amount of adsorbent required, while also facilitating the reuse of purified water.
Implementation Method 1
a removal unit that is configured to generate air bubbles in a presence of water containing a flotation chemical, allow the detached contaminant-bearing particles to attach to the air bubbles to form froth, and removes the froth
Implementation Method 2
an up-flow washing unit that is provided downstream of the removal unit and is configured to supply the first slurry into up-flow water to purify the primary purified soil
Implementation Method 3
a water treatment unit that is configured to bring the contaminant dissolved in a second slurry containing the fine-grained fraction and the froth into contact with an adsorbent to obtain purified water
Data Source
AI summary
A washing treatment system for contaminated soil, including: a classifier that is configured to obtain a sand fraction having a particle size within a predetermined range and a fine-grained fraction having a particle size smaller than the predetermined range, from contaminated soil containing one or more contaminants selected from dioxins and agricultural chemicals; a detaching/washing unit that is configured to detach a contaminant particle containing the from a surface of the sand fraction; a removal unit that is configured to generate air bubbles in a presence of water containing a flotation chemical, allows the detached contaminant-bearing particles to attach to the air bubbles to form froth, and removes the froth to obtain a first slurry containing primary purified soil; and an up-flow washing unit that is provided downstream of the removal unit, and is configured to supply the first slurry into up-flow water to purify the primary purified soil.