Wastewater Treatment System with Direct-Connected Evaporative Crystallization
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Solution Overview
Problem
Current wastewater treatment technologies for oilfield wastewater face challenges such as complex processes, high failure rates, incomplete desalination, and high costs, leading to environmental pollution and economic inefficiencies, particularly in handling high-hardness wastewater that causes membrane fouling and scaling issues.
Innovation Solution
A wastewater treatment system comprising a microfiltration unit, membrane salt separation unit, and directly connected evaporative crystallization units that separate monovalent and multivalent ions and crystallize them into respective salts, using sintered polyvinylidene fluoride microfiltration and disk tube nanofiltration membranes, and a reverse osmosis membrane concentration unit to simplify the process and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wastewater treatment processes are used, then treatment capacity is achieved, but the process becomes complex and costs increase
Solution Approach 1:
The patent combines multiple treatment functions (microfiltration, nanofiltration, and evaporative crystallization) into an integrated system where units are directly connected without intermediate pools, simplifying the overall process while maintaining comprehensive treatment capability
Solution Approach 2:
The treatment process is divided into distinct functional modules (microfiltration unit, nanofiltration unit, evaporative crystallization unit) that can operate independently but are directly connected, allowing for simplified process flow and reduced complexity
2Manufacturing precision
If conventional treatment methods are used, then some treatment is achieved, but desalination is incomplete and membrane fouling occurs
Solution Approach 1:
The microfiltration unit performs preliminary filtration to remove suspended solids and organic matter before the wastewater reaches the nanofiltration and evaporative crystallization units, preventing membrane fouling and extending membrane life
Solution Approach 2:
The system changes the operational parameters by using direct connection between units, allowing the evaporative crystallization unit to operate at high temperatures that effectively remove salts without causing membrane damage, achieving complete desalination
3Manufacturing precision
If multiple treatment units with intermediate pools are used, then treatment thoroughness is achieved, but operation costs and investment costs increase
Solution Approach 1:
The patent eliminates intermediate pools and combines treatment units through direct connections, reducing the number of components needed while maintaining thorough treatment through the integrated microfiltration-nanofiltration-evaporative crystallization process
Solution Approach 2:
The evaporative crystallization unit serves multiple functions: it concentrates wastewater, removes salts through crystallization, and can operate without intermediate storage pools, reducing overall system complexity and cost
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 system achieves standard discharge treatment, reduces operation and investment costs, and enhances economic benefits by simplifying the treatment process, improving membrane durability, and efficiently handling high-hardness wastewater, while minimizing environmental impact.
Implementation Method 1
a microfiltration unit, configured to receive a wastewater and filter the wastewater to obtain a solution
Implementation Method 2
a membrane salt separation unit, configured to receive the solution and separate monovalent ions and multivalent ions in the solution
Implementation Method 3
a first evaporative crystallization unit, configured to crystallize the first solution to form a monovalent salt; and a second evaporative crystallization unit, configured to crystallize the second solution to form a mixed salt
Implementation Method 4
the membrane concentration unit comprises a reverse osmosis membrane, and the membrane concentration unit is configured to increase concentration of the monovalent ions and concentration of the multivalent ions in the solution
Data Source
AI summary
A wastewater treatment equipment and a treatment method of a wastewater are provided. The wastewater treatment equipment includes: a microfiltration unit, configured to receive and filter a wastewater to obtain a solution; a membrane salt separation unit, configured to receive the solution and separate monovalent ions and multivalent ions from the solution to obtain a first solution including the monovalent ions and a second solution including the multivalent ions; a first evaporative crystallization unit, configured to crystallize the first solution to form a monovalent salt; and a second evaporative crystallization unit, configured to crystallize the second solution to form a mixed salt; the microfiltration unit is connected to the membrane salt separation unit, and the first evaporative crystallization unit and the second evaporative crystallization unit are both directly connected to the membrane salt separation unit, the wastewater treatment equipment can achieve the standard discharge of wastewater.