Wastewater Nitrogen Removal via Supplement Dosing
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Solution Overview
Problem
Residential wastewater treatment plants face challenges in maintaining high total nitrogen (TN) removal efficiency, particularly when faced with low pH and high TN influent conditions, which affect nitrification and denitrification processes.
Innovation Solution
A system and method involving multiple chambers (pretreatment, anoxic, and aeration) with the addition of organic carbon sources and alkalinity supplements to maintain optimal ratios, enhancing TN removal through nitrification and denitrification processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If supplements are added to maintain optimal carbon to nitrogen ratio and pH, then TN removal efficiency is improved, but system complexity and operational cost increase
Solution Approach 1:
The system performs preliminary actions by dosing supplements (carbon sources and alkalinity) before the nitrification and denitrification processes occur. This ensures optimal conditions are established in advance, preventing process failures due to poor carbon to nitrogen ratio or pH conditions, thereby improving TN removal reliability without requiring complex real-time control systems.
Solution Approach 2:
The system incorporates automatic dosing mechanisms that monitor and adjust supplement addition based on process conditions. The system essentially serves itself by automatically maintaining optimal carbon to nitrogen ratio and pH levels through integrated sensors and dosing pumps, reducing the need for external intervention and complex operational management.
2Reliability
If supplements are dosed to maintain optimal conditions, then TN removal efficiency is improved, but operational cost increases
Solution Approach 1:
The system employs feedback control mechanisms where sensors monitor pH levels and dissolved oxygen conditions in real-time, and this information feeds back to automatically adjust supplement dosing rates. This ensures supplements are added only when needed and in optimal amounts, preventing waste and minimizing operational costs while maintaining high TN removal efficiency.
Solution Approach 2:
The system dynamically adjusts operating parameters such as carbon source dosing rate and alkalinity addition based on measured conditions like pH and dissolved oxygen levels. By changing these parameters adaptively rather than using fixed dosing rates, the system optimizes supplement usage and reduces unnecessary chemical consumption, thereby lowering operational costs.
3Reliability
If multiple chambers are used for nitrification and denitrification, then TN removal capability is improved, but device complexity increases
Solution Approach 1:
The system divides the treatment process into distinct functional chambers: an anoxic chamber for denitrification and an aerobic chamber for nitrification. This segmentation allows each chamber to operate under optimized conditions (anoxic for nitrogen removal, aerobic for ammonia conversion), improving overall TN removal capability while keeping each individual chamber relatively simple in design.
Solution Approach 2:
The multi-chamber system serves multiple functions within a single integrated unit: it performs both nitrification and denitrification, provides pH control, and maintains optimal carbon to nitrogen ratios. By combining these functions in a unified system design rather than separate standalone units, the system achieves high TN removal capability without proportionally increasing overall device complexity.
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 supplementation method significantly increases TN removal efficiency, ensuring compliance with discharge limits even under challenging conditions, as demonstrated by test results showing reduced effluent TN concentrations.
Implementation Method 1
enhancing TN removal through nitrification and denitrification processes
Implementation Method 2
enhancing TN removal through nitrification and denitrification processes
Implementation Method 3
an aeration chamber or tank... aerating the anoxically treated wastewater in the aeration chamber
Implementation Method 4
a settling chamber or tank... receiving the aerated wastewater in a settling chamber
Data Source
AI summary
A system and method of supplements dosing to remove total nitrogen (TN) from domestic wastewater that can be implemented in a multi-chamber system with a pretreatment chamber fluidly connected to either an anoxic chamber or an aeration chamber, and if connected to the anoxic chamber, the anoxic chamber is fluidly connected to the aeration chamber or tank, and the aeration chamber is fluidly connected to a settling chamber or tank. The system can be used with several methods of organic and alkaline material supplements dosing to remove suspended solids, BOD, ammonia (NH4), nitrate and TN from wastewater.