IC（internal circulation）反应器是新一代高效厌氧反应器，废水在反应器中自下而上流动，污染物被细菌吸附并降解，净化过的水从反应器上部流
出。
特点
1、容积负荷高：IC反应器内污泥浓度高，微生物量大，且存在内循环，传质效果好，进水有机负荷可超过普通厌氧反应器的3倍以上。
2、节省投资和占地面积：IC 反应器容积负荷率高出普通UASB 反应器3倍左右，其体积相当于普通反应器的1/4—1/3 左右，大大降低了反应器的基建投资；而且IC反应器高径比很大（一般为4—8），所以占地面积少。
3、抗冲击负荷能力强：处理低浓度废水（COD=2000—3000mg/L）时，反应器内循环流量可达进水量的2—3 倍；处理高浓度废水（COD=10000—15000mg/L）时，内循环流量可达进水量的10—20倍。大量的循环水和进水充分混合，使原水中的有害物质得到充分稀释，大大降低了毒物对厌氧消化过程的影响。
4、抗低温能力强：温度对厌氧消化的影响主要是对消化速率的影响。IC反应器由于含有大量的微生物，温度对厌氧消化的影响变得不再显著和严重。通常IC反应器厌氧消化可在常温条件（20—25 ℃）下进行，这样减少了消化保温的困难，节省了能量。
5、具有缓冲pH值的能力：内循环流量相当于第1 厌氧区的出水回流，可利用COD转化的碱度，对pH值起缓冲作用，使反应器内pH值保持最佳状态，同时还可减少进水的投碱量。
 6、内部自动循环，不必外加动力：普通厌氧反应器的回流是通过外部加压实现的，而IC 反应器以自身产生的沼气作为提升的动力来实现混合液内循环，不必设泵强制循环，节省了动力消耗。
7、出水稳定性好：利用二级UASB串联分级厌氧处理，可以补偿厌氧过程中K s高产生的不利影响。Van Lier[6]在1994年证明，反应器分级会降低出水VFA浓度，延长生物停留时间，使反应进行稳定。
8、启动周期短：IC反应器内污泥活性高，生物增殖快，为反应器快速启动提供有利条件。IC反应器启动周期一般为1～2个月，而普通UASB启动周期长达4～6个月[7]。
9、沼气利用价值高：反应器产生的生物气纯度高，CH4为70%～80%，CO2为20%～30%，其它有机物为1%～5%，可作为燃料加以利用
IC 反应器当前在造纸行业应用较多的是用各类废纸作原料的造纸企业； IC厌氧反应器也适用于有机高浓度废水，如，玉米淀粉废水、柠檬酸废水、啤酒废水、土豆加工废水、酒精废水等。
IC (internal circulation) reactor is a new generation of highly efficient anaerobic reactor, wastewaterfrom bottom to top in the reactor flow, pollutants are bacterial adsorption and degradation, purifiedwater from the upper flow reactor out
Characteristic:
one, the high load capacity, high sludge concentration in the IC reactor, microbial biomass, and the presence of internal circulation, good mass transfer effect,influent organic load can be more than ordinary anaerobic reactor is more than 3 times.
two, save the investment and occupation area: IC reactor volumetric loading rate is higher than the ordinary UASB reactor 3 times, its volume is equivalent to the ordinary reactor 1/4 about 1/3,greatly reduce the capital investment of the reactor and IC reactor; big ratio of height to diameter(usually 4 - 8), so covers an area of less.
three strong capacity of resisting impact load: the treatment of low concentration wastewater(COD=2000 - 3000mg/L), reactor internal circulation flow up to the water intake amount of 2 - 3 times; the treatment of high concentration wastewater (COD=10000 - 15000mg/L), the internal circulation flow up to the amount of water 10 to 20 times. And the water are fully mixed a lot of circulating water, so that the harmful substances in the raw water are fully diluted greatly reduces the effects of toxicants on anaerobic digestion process.
four, anti low temperature capability: the effect of temperature on anaerobic digestion are a major influence on the rate of digestion. IC reactor because of containing a large number of microorganisms, the effect of temperature on anaerobic digestion is no longer significant andserious. Usually IC reactor for anaerobic digestion at ambient temperature (20 - 25 DEG C) under,this reduces the digestion insulation difficulties, saving energy.
five, has the ability to buffer the pH value: internal circulation flow is equivalent to first of the anaerobic zone of the effluent recycle, alkalinity can be transformed by COD, play a buffering role on pH value and pH value in the reactor to maintain the best condition, and can also reduce the amount of alkaliwater.
six, the internal automatic cycle, without external power: return of ordinary anaerobic reactor isrealized by external pressure, and IC reactor to self generated biogas as motivation to achievemixed liquid circulation, do not have to set the pump forced circulation, the power consumption is saved.
seven, the effluent stability: the use of two stage UASB series classification of anaerobic treatment, the adverse effects of high K s can generate compensation in the anaerobic process. Van Lier[6]proved in 1994, reactor grade will reduce the effluent VFA concentration, prolong the biologicalretention time, it makes the reaction stability.
eight, short start-up period: the sludge with high activity in the IC reactor, biological rapid proliferation,as the reactor starting-up provided favorable conditions. IC reactor start-up period is generally 1 to 2 months, while the ordinary UASB to start the cycle for 4 ~ 6 months [7].
nine, the use of high value: biogas reactor produced biogenic gas of high purity, CH4 was 70% ~ 80%,CO2 was 20% ~ 30%, other organic matter is 1% ~ 5%, can be used as fuel to use The IC reactor is widely used in papermaking industry is to use all kinds of waste paper as raw material papermaking enterprises; IC anaerobic reactor is also suitable for high concentration organic wastewater, such as, the wastewater of maize starch, citric acid wastewater, brewery wastewater, the potato processing wastewater, alcohol wastewater.
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