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Two-factor design for coagulant/flocculant doses effect for solid-liquid separation of dairy manure
1Department of Chemical Engineering and Inorganic Chemistry, University of Cantabria. Los Castros s/n, 39005 Santander, Spain.
Environmental Technology
|March 2, 2006
Summary
Dairy manure treatment using ferric chloride (FeCl3) and cationic polyacrylamide (MCP1) effectively reduced supernatant contaminants. Both additives significantly impacted filtrate chemical oxygen demand and total organic carbon levels, optimizing waste management.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Waste Management
Background:
- Dairy manure presents significant environmental challenges due to its high organic content and potential for water pollution.
- Coagulation-flocculation is a promising technique for treating manure wastewater, but optimal additive dosages require investigation.
- Understanding the impact of coagulants and flocculants on various wastewater parameters is crucial for effective treatment.
Purpose of the Study:
- To investigate the efficacy of ferric chloride (FeCl3) and medium cationic polyacrylamide (MCP1) in treating dairy manure supernatant.
- To determine the optimal dosage of FeCl3 and MCP1 for reducing key contaminant concentrations in dairy manure wastewater.
- To evaluate the influence of these additives on total solids, volatile solids, and organic load parameters.
Main Methods:
- Dairy manure was subjected to coagulation-flocculation using FeCl3 as a coagulant and MCP1 as a flocculant.
- Response surface methodology was employed to systematically study the effects of varying FeCl3 and MCP1 doses.
- Supernatant properties, including filtrate chemical oxygen demand (CODf), total organic carbon (TOC), total solids (TS), volatile solids (VS), CODt, and CODvfa, were analyzed.
Main Results:
- Both FeCl3 and MCP1 doses significantly influenced filtrate chemical oxygen demand (CODf) and total organic carbon (TOC) concentrations in the supernatant (p < 0.05).
- MCP1 dose was the primary factor significantly affecting total solids (TS), volatile solids (VS), CODt, and CODvfa (p < 0.05).
- A predictive model for TOC showed high accuracy (R²=0.980), while the model for VS was less precise (R²=0.783).
Conclusions:
- Coagulation-flocculation with FeCl3 and MCP1 is effective in reducing organic contaminants in dairy manure supernatant.
- Optimizing the doses of FeCl3 and MCP1 is critical for achieving desired treatment outcomes and managing dairy wastewater.
- The study provides a predictive framework for optimizing dairy manure treatment processes.
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