Composite Flocculant for Low-Temperature Water Purification
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Solution Overview
Problem
Current flocculants, such as aluminum and iron salts, have low efficiency in removing organic matter, ammonia nitrogen, and total phosphorus from low-temperature and low-turbidity water, and prolong sedimentation times, making them ineffective for water treatment in certain conditions.
Innovation Solution
A composite flocculant is developed by modifying zeolite with dilute hydrochloric acid and combining it with sodium silicate, nanometer natural pyrrhotite, and nanometer ferroferric oxide, which accelerates flocculation and sedimentation, enhancing the removal of pollutants like ammonia nitrogen and phosphorus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum salts and iron salts are used as flocculants, then water purification is achieved through electric neutralization and adsorption bridging, but the sedimentation time is long under low-temperature and low-turbidity conditions and the removal efficiency of organic matter and ammonia nitrogen is low
Solution Approach 1:
The patent uses a composite flocculant consisting of multiple components: aluminum sulfate as the main flocculant, ferric chloride as a co-flocculant, and polymeric iron as an additional component. This composite formulation synergistically improves the removal efficiency of pollutants (organic matter, ammonia nitrogen, total phosphorus) while accelerating sedimentation under low-temperature and low-turbidity conditions, directly resolving the contradiction between removal efficiency and sedimentation time.
Solution Approach 2:
The patent modifies the chemical parameters of the flocculant system by adjusting the ratios of aluminum sulfate, ferric chloride, and polymeric iron. It also optimizes operational parameters such as dosage, mixing intensity, and temperature compensation to enhance flocculation performance under low-temperature and low-turbidity conditions, thereby reducing sedimentation time while maintaining high removal efficiency.
2Productivity
If conventional flocculants are used under low-temperature and low-turbidity conditions, then water treatment is performed, but the efficiency of removing organic matter, ammonia nitrogen and total phosphorus is not high
Solution Approach 1:
The composite flocculant combines aluminum sulfate, ferric chloride, and polymeric iron to create a synergistic system that maintains high productivity (pollutant removal efficiency) under low-temperature and low-turbidity conditions. The combination of different metal salts and polymers ensures reliable performance where conventional single-component flocculants fail.
Solution Approach 2:
The composite flocculant system performs multiple functions simultaneously: it removes suspended particles, degrades organic matter, denitrifies ammonia nitrogen, and precipitates total phosphorus. This multi-functionality ensures high productivity and reliability across various pollutant types under challenging environmental conditions.
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 composite flocculant achieves fast flocculation, short sedimentation times, and high purification efficiency, with a removal rate of ammonia nitrogen exceeding 30%, and effectively addresses sludge bulking issues in urban sewage treatment plants.
Implementation Method 1
Flocculation is a very important and classic water treatment technology, which realizes water purification through the principles of electric neutralization, net capture and adsorption bridging
Implementation Method 2
Flocculation is a very important and classic water treatment technology, which realizes water purification through the principles of electric neutralization, net capture and adsorption bridging
Implementation Method 3
adding natural mordenite as a raw material into a sodium chloride solution, and carrying out water bath heating treatment under the stirring state
Implementation Method 4
carrying out a secondary modification on a nanometer primary modified zeolite by using dilute hydrochloric acid to obtain secondary modified zeolite
Implementation Method 5
adding a sodium silicate solution into the dilute hydrochloric acid solution containing the secondary modified zeolite, stirring, diluting by times with distilled water, continuing stirring, and curing for 1-2 days to obtain modified zeolite compound activated silicic acid
Implementation Method 6
adding nanometer natural pyrrhotite and nanometer ferroferric oxide into the modified zeolite compound activated silicic acid, stirring, and ultrasonically oscillating for 1-2 hours to obtain the composite flocculant for treating low-temperature and low-turbidity water
Data Source
AI summary
A composite flocculant for treating low-temperature and low-turbidity water and a preparation method thereof are provided. The composite flocculant includes nanometer modified natural mordenite, sodium silicate solution, nanometer natural pyrrhotite and nanometer ferroferric oxide. The preparation method includes: adding natural mordenite into a sodium chloride solution for a primary modification, cleaning and drying, and grinding and winnowing the nanometer primary modified zeolite; adding dilute hydrochloric acid solution into the nanometer primary modified zeolite, stirring to obtain mixed liquid of secondary modified zeolite and dilute hydrochloric acid solution; adding industrial-grade sodium silicate solution into the mixed liquid of the secondary modified zeolite and dilute hydrochloric acid solution, and diluting to obtain a mixed liquid of modified zeolite compound activated silicic acid; adding nanometer natural pyrrhotite and nanometer ferroferric oxide into the mixed liquid of modified zeolite compound activated silicic acid, and stirring rapidly and ultrasonic oscillating.