Modular high efficiency wastewater

Multiphase internal circulation anaerobic reactor principle

Moving bed biological carrier filtration reactor
MIC anaerobic reactor

Multiphase internal circulation anaerobic reactor principle:

The MIC (Multi-Stage & Multiphase With Innercirculation Anaerobic System). Anaerobic reactor is a multi-stage multi-phase anaerobic treatment system with internal circulation, each reaction chamber is an independent reaction unit, and the system is composed of a plurality of independent reaction chambers. Thus, forming into a structure of biological phase separation.


The hydraulic flow in the single reaction chamber is fully mixed, and the hydraulic flow between the reaction chambers is close to the push flow type, pursuing higher removal efficiency and environmental impact load capacity, better effluent quality, and more stable anaerobic operating system, so that the system maintains a certain matrix concentration gradient, fully embodying the hierarchical multi-phase process idea.

The hydraulic flow in the single reaction chamber is fully mixed, and the hydraulic flow between the reaction chambers is close to the push flow type, pursuing higher removal efficiency and environmental impact load capacity, better effluent quality, and more stable anaerobic operating system, so that the system maintains a certain matrix concentration gradient, fully embodying the hierarchical multi-phase process idea.

MAIN FEATURES OF THE PROCESSING SYSTEM

(1) Achieving Modularized Structure

A modularized anaerobic process structure is formed, which fully reflects the easy expansion of the elastic combination. Because the entire reactor system is formed by a series of separate reaction chambers, each reaction chamber is a separate reaction unit.

(2) Excellent hydraulic state

The flow state between the reaction chambers of the system is the a force flow state, maintaining a certain substrate concentration gradient, and each reaction chamber is a mixed flow state to form a multi-phase anaerobic treatment system, which is beneficial to the anaerobic flora. This may improve the processing effect of the system and the stability of operation. The biological sludge can be fully mixed with the influent substrate to maintain a certain substrate concentration gradient to ensure that the anaerobic microorganism can fully degrade the matrix in the sewage.

(3) Excellent mixing state

The single reaction chamber has upper and lower reaction areas, and the gaseous internal circulation technology is used in the lower reaction area to achieve sufficient mixing contact between the biological sludge and the substrate mechanism, thereby greatly increasing the organic volumetric load. Due to the high organic load, the high-intensity circulating flow rate (which is several times the influent flow rate) is formed, and the high-yield biogas is generated, so that the reaction chamber is in an expanded fluidized state, and the purpose of full gas-lifting cycle agitation is achieved, and the strengthening is achieved. This could cause mass transfer efficiency of biochemical reactions.

(4) Excellent microorganism phase separation state

 

For a multi-phase anaerobic biological reaction system, the separated reaction chambers in the system can cultivate suitable anaerobic bacterial communities to adapt to their corresponding substrate components and environmental factors. The biological phase of each reaction chamber changes with the matrix and the environment, and the law of gradual change is regulated by the degree of degradation of the substrate, ensuring that the microorganisms in each reaction chamber have the best metabolic environment and metabolic activity, thereby achieving the best.

 

(5) Excellent sludge interception ability

In a separate reaction chamber, the three-phase separators in the upper and lower reaction zones allow the biological sludge to be effectively retained. The three-phase separator in the lower stage I reaction zone separates a large amount of biogas and water to create a good granular sludge sedimentation environment; therefore, the threephase separator of the upper stage-Il reaction zone can be effectively affected by the upward flow of biogas. The granular sludge and water are separated to achieve a good sludge interception effect, and the problem that the granular sludge is released out of the system under high sludge volume load is solved.

(6) High organic load

The organic load of the reactor is much higher than that of the UASB anaerobic reactor, which is 2 to 4 times of the UASB system. The inner circulation increases the rising flow rate of the lower reaction zone and enhances the mass transfer efficiency of the biological granular sludge and the substrate.

(7) Small reactor volume

The system has a high bioburden and greatly reduces the required space when processing the same wastewater. The volumetric load is four times that of the conventional UASB, and the required volume is 1/4 to 1/3 of the UASB.

(8) Individual collector for reactor chamber gaseous

The biochemical reaction of the reaction chamber at the front end of the system is mainly based on acid production, preventing acidification and the effect of hydrogen partial pressure on the anaerobic biochemical reaction process. Its gas production contains relatively more H2 and CO2 points, and its independent collection can reduce the H2  and CO2 partial pressures in other reaction chambers.

(9) Strong anti-impact load capacity

The internal circulation increases the rising flow rate of the lower reaction area, and the circulating water dilutes the influent water, increases the hydraulic shearing force and has excellent mass transfer efficiency. These mechanisms form the reactor with anti-impact load capacity and acid-base adjustment ability.

Performance comparison between MIC and UASB

The following comparisons are based on the comparison of the water quality of the IC-SMPA and UASB in the three reaction chambers.

MIC Anaerobic Reactor UASB Anaerobic Reaction
Construction Complexity Simple Construction Influent Equipment Complex
Architectural Characteristics With Internal Circulation, The Liquid Rises At A High Flow Rate, And The Sludge Bed Is In An Expanded State, Which Is Less Prone To Channeling And Dead Angles. Easy To Generate Channel And Dead Angle
Volume Load (normal Temperature) 2∼4 Times For Uasb --
Biological Phase Separation Yes No
Required Volume 1/4 ∼1/3 1
Impact Load Resistance Strong Weak
Hydraulic Flow Excellent (push Flow + Full Flow) General (mixed Flow)
Processing Stability +++ +
Water Quality After Treatment ++ +
Value For Money +++ (lower Initial Fee) +

The principle of internal circulation fluidized bed bioreactor

Internal circulating fluidized bed bioreactor
Internal circulating fluidized bed bioreactor

The principle of internal circulation fluidized bed bioreactor

The reactor is an inner-circulation fluid bed bio-reactor with an internal circulation. Compared with a general fluidized bed reactor, the amount of reflux water required to maintain the fluidized state of the sludge bed can be reduce it by 45-65%. In addition, the multi-stage string structure fully reflects the hierarchical multi-phase process idea, achieving higher removal efficiency and environmental impact load capacity, better effluent quality, and more stable operating system. A hydraulic internal circulation device is arranged in the reaction zone, and the water body, the biological carrier in the upper layer of the reaction zone and the influent sewage are simultaneously sucked down by the jet principle to form a hydraulic circulation inside the reaction zone.

MAIN FEATURES OF THE PROCESSING

(1) Achieving modularized structure

The whole reactor system is composed of a plurality of independent reaction units connected in series to form a multiphase biological classification processing system, to forming a modularized biological treatment structure, which fully reflects the easy expansion performance of the elastic combination.

(2) Greatly reducing the energy consumption

The internal circulation device inside the fluidized bed reaction zone enhances the efficiency of the threephase separator and greatly reduces the amount of reflux water

(3) High Efficiency of dissolved oxygen ability

The influent water and the air are sucked in and mixed respectively by the reflux hydraulic force, and the dissolved oxygen adsorption ability of the activated carbon biocarrier is added in order to form a high-efficiency dissolved oxygen effect.

(4) High efficient process ability

The application of activated carbon has a larger specific surface area and great force adsorption capacity, refractory organic matter and dissolved oxygen in water, forming a three-phase coexistence environment of high concentration matrix, adsorption microorganism, high concentration organism and high concentration oxygen, the reaction creates superior processing conditions which is biochemical.

(5) Ability to process toxicated substances and refractory wastewater

Principle of bioactive carbon reactor

Principle of bioactive carbon reactor
Principle of bioactive carbon reactor

Principle of bioactive carbon reactor

The principle of the Biological Active Carbon (BAC) is to domesticate microorganisms on the surface of activated carbon to form a fixed growth biofilm to decompose organic pollutants from waste water. Bioactive carbon has a strong adsorption capacity, and organic pollutants are adsorbed on the active substrate. The biofilm on the activated carbon particles adapts to the pollutant and decomposes it, and the vacated active group can restore the adsorption capacity, and then adsorb the organic matter. . In this way, the adsorption process of adsorption, desorption, regeneration and adsorption is maintained, and the adsorption capacity of the activated carbon surface is maintained, which is called “bioregeneration”.

If the amount of biological regeneration in the bioactive carbon system is greater than the amount of activated carbon adsorbed, it is not necessary to take out the activated carbon and regenerate it by other methods. In addition, the sludge retention time of the bioactive carbon treatment system is very long, so the amount of sludge generated is extremely small.

Principle of bioactive carbon reactor

Principle for biological carrier filtration reactor of movable bed-type

移床式生物載體過濾反應器

Principle for biological carrier filtration reactor of movable bed-type

The Bio-Filter Reactor (DBF, Dynamic Bio-Filter Reactor) can be designed to form a bioadsorption reactor or a biological desulfurization and denitrification reactor. Biochemical reactor is built for simultaneous biodegradation, carrier filtration, and carrier cleaning capability.

It is combined with UFBR or IC bioreactor to form a two-phase high-efficiency treatment system with biosorption, which leads to high efficiency, energy saving and excellent effluent quality.

MAIN FEATURES OF THE REACTOR

(1) Bio-absorption ability

Adsorption of microorganisms on biological carriers – in a state of high-speed proliferation, can effectively remove 4560% of BOD in sewage. It has strong ability to coagulate, adsorb and degrade organic matter, and can absorb suspended solids and colloidal organic pollutants in sewage.

(2) Sedimentation basin and sludge refund will not be needed

The bio-carrier in the reactor has the function of filtering and decomposing organic contaminants, so the sedimentation basin will not be needed.

(3) No sludge puffing

The biosorption on the surface of the carrier forms a stable bio membrane and a complete bio-chain, it has strong adaptability to environmental variability. The system does not cause system failure due to sludge puffing in environmental variation.

(4) Modularized structure system

The system does not require a sedimentation basin, which is the key to solving the modularization of biological treatment systems. Its advantages are:
(1) It can easily be flexable in settling and expansion according to its quantity of water.
(2) The biological system can continue to operate during maintenance.

(5) Low operating energy consumption

The gaseous liquid contact of the surface is large, which greatly reduces the consumption requirement for aeration (50~60% of the traditional activated sludge treatment method). The carrier has the function of cutting bubbles and diffusing, and has high oxygen transmission efficiency, also the sludge load is up to 2-6 kg.BOD/KgMLSS-d. In addition, there is no need to refund sludge to maintain fixed biomass, meanwhile, a large amount of electricity for processing is saved.

Technical characteristics

Traditional biological treatments (activated sludge process, oxidized deep channel or SBR) have the following drawbacks:

(1) It is prone to sludge bulking, which causes the treatment system to fail.
(2) The volumetric load is low (only about 0.5 kg/m3), and the treatment efficiency is low.
(3) Large area.
(4) High operating energy consumption.
(5) Not resistant to impact load.

This technology reforms the above-mentioned shortcomings and creates a biological treatment system with high efficiency, stable operation, good effluent quality and no secondary pollution:

1. No need for sedimentation tanks, modularization of processing systems

MIC anaerobic bioreactor, ICFB biological fluidized bed and DBR biological filtration reactor are modular reactors. Various types of wastewater characteristics are combined into a highly efficient biological treatment system for high-concentration organic wastewater, high-concentration nitrate wastewater,Treatment of high ammonia nitrogen wastewater and high concentration sulfate wastewater.

2. Small footprint, no odor

The floor space is 1/3 to 1/2 of the traditional treatment system, and the reactors are all airtight and will not produce odor during operation.

3. No blower, no noise problem

The aerobic aeration of the treatment system uses high-efficiency negative pressure jet aeration, no need to set the blower, and there is no noise problem.

 

Composite flow regime (multi-stage multiphase) reactor principle

Composite flow regime (multi-stage multiphase) reactor principle
Composite flow regime (multi-stage multiphase) reactor principle

Composite flow regime (multi-stage multiphase) reactor principle

The use of a fully mixed flow inside a single reaction chamber enhances the good contact of the microorganisms with the influent substrate to facilitate the biochemical reaction. The push flow between multiple reaction chambers is formed to form a high mass transfer driving force, which improves the reaction rate, treatment effect and processing capacity of the system.

The push-flow reactor has a greater mass transfer driving force than a fully mixed-flow reactor. Under the same conditions, the push flow fluidized reactor can achieve better treatment results than the fully mixed fluid state reactor.

In the flow state of N series-connected fully mixed reactors, when N=1, it is a complete mixed flow, and when N tends to ∞, it is a push flow.

Composite flow regime (multi-stage multiphase) reactor principle
Mono dynamic equation

Performance comparison between DBF + FBAC and MBR systems

項目 DBF + FBAC MBR
建造費用 土建工程 土建量小 土建量小
建造費用​ 機電、自控設備 自控儀錶多,機電技術層次高 自控儀錶多,機電技術層次高
建造費用​ 總投資 相對較小 相對較大
運行費用 曝氣量 比活性污泥法低30%~40% 比活性污泥法略低
運行費用 污泥迴流 不需污泥迴流 不需污泥迴流
運行費用 總運轉費用 很高
運行費用​ 維護費用 一般 非常高
處理效果 體現優勢 體現在提高微生物量、建立優勢菌群以及強化水力傳質架構。 體現在固液分離性能的大幅改善而提高微生物量,並未改變生化本質。
處理效果​ 傳質能力 優良 一般
處理效果​​ 出水水質 優良 優良
處理效果​​ 污泥膨化 易發生,需加生物選擇性物質防止
處理效果​​​ 衝擊負荷的影響 具備內循環加上多級架構,相對具備優良的耐日常衝擊負荷的能力 較傳統活性污泥法好
處理效果 溫度變化的影響 多段和封閉性結構,不易受低溫影響 處理效果易受低溫影響
處理效果​ 性價比 +++ ++

Example: concentration organic wastewater treatment process

High concentration organic wastewater treatment process