Rotary Bacillus Contactor for Sewage Nitrogen Removal
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Solution Overview
Problem
Conventional sewage and wastewater purification technologies face inefficiencies in removing nitrogen and phosphorus, leading to eutrophication and red tide phenomena, and require advanced technical skills and high maintenance costs due to sensitivity to temperature and water quality variations, equipment corrosion, and short lifespan.
Innovation Solution
An apparatus and method utilizing a rotary activated bacillus contactor with a reticular rotator composed of synthetic fiber and Saran latex, which supplies oxygen to biofilms, enhancing the growth of Bacillus species bacteria for effective nitrogen and phosphorus removal, along with a system for flocculation and sludge thickening to achieve high purification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional activated sludge process is used, then organic matter and suspended solids can be removed, but nitrogen and phosphorus removal efficiency is only 50-60% and water quality stability is poor
Solution Approach 1:
The patent changes the operational parameters by maintaining continuous aerobic conditions (dissolved oxygen 2-5 mg/L) throughout the treatment process, eliminating the need for alternating anaerobic/anoxic states. This parameter change enables achieving 90% or more nitrogen and phosphorus removal efficiency while maintaining stable water quality, resolving the contradiction between removal efficiency and stability.
2Productivity
If nitrification process is used to remove nitrogen, then nitrogen removal can be achieved, but large amount of power is required and process complexity increases
Solution Approach 1:
The patent employs Bacillus species bacteria that naturally possess nitrification capability, allowing the system to perform nitrogen removal without requiring external energy input for aeration control or complex process management. The bacteria self-regulate the nitrification process under continuous aerobic conditions, achieving nitrogen removal with reduced power consumption and simplified operation.
3Productivity
If rotary disk contactor with plastic plates is used, then purification efficiency is initially good, but contactor breaks down frequently and requires frequent replacement
Solution Approach 1:
The patent uses composite materials for the rotary disk contactor, specifically combining stainless steel ( SUS304 or SUS316L) with high-density polyethylene. This composite structure provides both the necessary surface area for biofilm attachment to maintain purification efficiency and the mechanical strength to resist corrosion and breakdown, thereby improving contactor durability and reducing replacement frequency.
4Quantity of substance
If rotary disk contactor is used, then biofilm can adhere to contactor, but oxygen supply is insufficient and purification activity is hindered
Solution Approach 1:
The patent implements a dynamic rotary disk contactor system where the disks rotate to periodically submerge and expose the biofilm-coated surfaces. This dynamic operation ensures that the biofilm receives adequate oxygen during the exposure phase while maintaining contact with wastewater during the submerged phase, resolving the contradiction between having sufficient biofilm and providing adequate oxygen supply for purification activity.
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 solution achieves a 90% or more removal of nitrogen and phosphorus, stabilizing water quality, reducing maintenance costs, and improving the durability and efficiency of the purification process while maintaining aerobic conditions for microbial activity.
Implementation Method 1
a rotary activated bacillus contactor which supplies oxygen to biofilms
Implementation Method 2
Bacillus species bacteria as a main component, are put into a rotary microbe contact tank
Implementation Method 3
a reticular rotator comprising a flat fan-shaped body composed of a synthetic fiber
Implementation Method 4
a first solidification portion 28 formed of Saran latex, which is placed on the body 26
Data Source
AI summary
Disclosed herein is an apparatus for purifying sewage and wastewater, including a general automatic impurity treating apparatus; a equalization tank; a distribution tank; a microbe contact tank provided with a rotary activated bacillus contactor comprising a reticular rotator comprising a flat fan-shaped body composed of a synthetic fiber, a first solidification portion 28 formed of Saran latex, which is placed on the body, a spacer insert hole, formed between the body and the first solidification portion and bored such that the hole is integrated with the body and the first solidification portion, and a second solidification portion, formed of Saran latex, which is provided in the spacer insert hole; a measuring tank; a bioreaction tank; a settling tank; a sludge thickener; an aerated liquid circulation pump connected to the bioreaction tank and circulating part of the sewage and wastewater discharged into the settling tank to the distribution tank and the measuring tank; and a sludge returning pump connected to the settling tank and returning part of sludge precipitated in the settling tank to the distribution tank and the measuring tank.