混凝沉淀+ABR+UASB+A/O+气浮工艺处理高浓度抗生素原料药废水的研究
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摘要
江西某制药公司采用微生物发酵法生产硫酸小诺霉素原料药及各类制剂产品,在生产过程中会产生高浓度废水。本文针对所排放废水高CODcr、高NH3-N和高SS的特点,提出了混凝沉淀+ABR+UASB+A/O+气浮工艺处理该生产废水。首先将原水通过提升泵进入预沉淀桶,并且投加药剂进行混凝沉淀,通过沉淀去除大部分SS和部分CODcr;沉淀出水经过ABR和UASB二级厌氧去除大部分CODcr;厌氧出水采用前置反硝化A/O系统脱氮,O池混合液中含有大量硝酸盐,通过内循环回流到A池中,在A池内进行反硝化脱氮,A池中反硝化碳源来自污水中的有机物。为保证出水中CODcr和SS稳定达标,后续以气浮作为深度处理工艺。
采用混凝沉淀+ABR+UASB+A/O工艺处理高浓度原料药废水,通过实际工程调试以及系统稳定运行,得出以下研究成果：
(1)高浓度原料药废水具有CODcr高、SS高的特点,需采用混凝沉淀进行预处理。药剂采用PAM+PAC组合投加方式,对CODcr去除率接近40%,SS去除率接近95%。
(2)ABR采用低负荷方式启动,夏季水温较高,33～37℃,从调试初始启动到污泥驯化完成需要65天左右,对CODcr的去除率为70%,对SS去除率为72%。
(3)USAB中颗粒污泥的驯化培养采用负荷由低到高,循序渐进的方式进行,耗时50天,反应器内的平均污泥浓度将从5～10gVSS/L升高到30～40gVSS/L,颗粒污泥培养成功。稳定运行后,VSS平均质量浓度可达40g/L,pH控制在7.3～7.5, HRT=23.7h,出水VFA浓度在2～3mmol/L, CODcr去除率维持在60%左右。
(4)A/O池在稳定运行期间对CODcr的去除率为85%,对NH3-N去除率为80%,SV为25%～30%,控制硝化液回流比为1：1,污泥回流为比为1：1,A池反硝化率为60%～70%。
(5)气浮对CODcr的去除率为26%,对SS的去除率为68%。组合工艺对CODcr去除率为98.9%,对NH3-N去除率为84.6%,对SS去除率为99.6%。
结果表明,该废水出水中主要污染物指标均能达到《发酵类制药工业水污染物排放标准》(GB21903-2008)现有企业水污染物排放限值。
Microbial fermentation is used to produce the pharmaceutical raw materials of micronomicin sulfate and the medicament by a pharmaceutical company in Jiangxi,it will produce high concentration wastewater during the production process.This article has put forward the combination of coagulation sedimentation+ABR+UASB+A/O+Air flotation to treating this production wastewater for the reason that the wastewater has the characteristic of high CODcr,high NH3-N and high SS.First of all,raw water should flow into the pre-precipitation tank with lift pump,much SS and CODcr will be remove through the way of precipitation by putting into coagulant,then,the effluent wastewater from precipitation flows into ABR and UASB to remove most of CODcr in chronological order, the effluent wastewater from anaerobic treatment remove NH3-N with A/O,the oxic tank has a great deal of nitrate,it will flow back to the anoxic tank through internal circulation.and removes the nitrate by denitrification in the anoxic tank,the carbon source for denitrification in anoxic tank comes from the organic compound in sewage.The air flotation as a depth of processing to make sure the final effluent wastewater can reach the qualified standard stability.
Several researching results were studied in the project commissioning by treating the wastewater with the combination of coagulation sedimentation+ABR+UASB+A/O+Air flotation.
(1) The high concentration pharmaceutical raw materials of antibiotics wastewater has the characteristic of high CODcr and high SS so that it has to pretreatment by coagulation. PAC and PAM are put into the tank as the coagulant,the removeal rate of CODcr is nearly40%, the removeal rate of SS is nearly95%.
(2) ABR starts by the way of low load,the temperature range from33℃to37℃.It cost50d to complete the domestication of sludge, the removeal rate of CODcr is nearly70%, the removeal rate of SS is nearly72%.
(3)The domestication of granular sludge should be controled the load from low to high in UASB,it cost almost60d to finish it,the average sludge concentration increase from5-10gVSS/L to30-40gVSS/L,it means the domestication of granular sludge had completed.After stable operation, the average mass concentration of VSS had reached40g/L,pH=7.3-7.5,HRT=23.7,VFA of effluent water range from2-3mmol/L, the removeal rate of CODcr is nearly60%.
(4) During A/O system stable operation, the removeal rate of CODcr is nearly85%, the removeal rate of NH3-N is nearly80%,SV ranges from25%-30%,it controls reflux ratio of the nitrified liquid to1:1,and controls reflux ratio of sludge to1:1,the nitrification rate in anoxic tank ranges from60%to70%.
(5)The removeal rate of CODcr of air flotation is nearly26%, the removeal rate of SS of air flotation is nearly68%. The removeal rate of CODcr of the combination is nearly98.9%, the removeal rate of NH3-N of the combination is nearly84.6%, the removeal rate of SS of the combination is nearly99.6%.
The experiments and practice showed that the main indexes of the final effluent water can reach the discharging limiting numerical value of water pollutants of existing enterprises of discharge standards of water pollutants for pharmaceutical industry fermentation products category(GB21903-2008).
采用混凝沉淀+ABR+UASB+A/O工艺处理高浓度原料药废水,通过实际工程调试以及系统稳定运行,得出以下研究成果：
(1)高浓度原料药废水具有CODcr高、SS高的特点,需采用混凝沉淀进行预处理。药剂采用PAM+PAC组合投加方式,对CODcr去除率接近40%,SS去除率接近95%。
(2)ABR采用低负荷方式启动,夏季水温较高,33～37℃,从调试初始启动到污泥驯化完成需要65天左右,对CODcr的去除率为70%,对SS去除率为72%。
(3)USAB中颗粒污泥的驯化培养采用负荷由低到高,循序渐进的方式进行,耗时50天,反应器内的平均污泥浓度将从5～10gVSS/L升高到30～40gVSS/L,颗粒污泥培养成功。稳定运行后,VSS平均质量浓度可达40g/L,pH控制在7.3～7.5, HRT=23.7h,出水VFA浓度在2～3mmol/L, CODcr去除率维持在60%左右。
(4)A/O池在稳定运行期间对CODcr的去除率为85%,对NH3-N去除率为80%,SV为25%～30%,控制硝化液回流比为1：1,污泥回流为比为1：1,A池反硝化率为60%～70%。
(5)气浮对CODcr的去除率为26%,对SS的去除率为68%。组合工艺对CODcr去除率为98.9%,对NH3-N去除率为84.6%,对SS去除率为99.6%。
结果表明,该废水出水中主要污染物指标均能达到《发酵类制药工业水污染物排放标准》(GB21903-2008)现有企业水污染物排放限值。
Microbial fermentation is used to produce the pharmaceutical raw materials of micronomicin sulfate and the medicament by a pharmaceutical company in Jiangxi,it will produce high concentration wastewater during the production process.This article has put forward the combination of coagulation sedimentation+ABR+UASB+A/O+Air flotation to treating this production wastewater for the reason that the wastewater has the characteristic of high CODcr,high NH3-N and high SS.First of all,raw water should flow into the pre-precipitation tank with lift pump,much SS and CODcr will be remove through the way of precipitation by putting into coagulant,then,the effluent wastewater from precipitation flows into ABR and UASB to remove most of CODcr in chronological order, the effluent wastewater from anaerobic treatment remove NH3-N with A/O,the oxic tank has a great deal of nitrate,it will flow back to the anoxic tank through internal circulation.and removes the nitrate by denitrification in the anoxic tank,the carbon source for denitrification in anoxic tank comes from the organic compound in sewage.The air flotation as a depth of processing to make sure the final effluent wastewater can reach the qualified standard stability.
Several researching results were studied in the project commissioning by treating the wastewater with the combination of coagulation sedimentation+ABR+UASB+A/O+Air flotation.
(1) The high concentration pharmaceutical raw materials of antibiotics wastewater has the characteristic of high CODcr and high SS so that it has to pretreatment by coagulation. PAC and PAM are put into the tank as the coagulant,the removeal rate of CODcr is nearly40%, the removeal rate of SS is nearly95%.
(2) ABR starts by the way of low load,the temperature range from33℃to37℃.It cost50d to complete the domestication of sludge, the removeal rate of CODcr is nearly70%, the removeal rate of SS is nearly72%.
(3)The domestication of granular sludge should be controled the load from low to high in UASB,it cost almost60d to finish it,the average sludge concentration increase from5-10gVSS/L to30-40gVSS/L,it means the domestication of granular sludge had completed.After stable operation, the average mass concentration of VSS had reached40g/L,pH=7.3-7.5,HRT=23.7,VFA of effluent water range from2-3mmol/L, the removeal rate of CODcr is nearly60%.
(4) During A/O system stable operation, the removeal rate of CODcr is nearly85%, the removeal rate of NH3-N is nearly80%,SV ranges from25%-30%,it controls reflux ratio of the nitrified liquid to1:1,and controls reflux ratio of sludge to1:1,the nitrification rate in anoxic tank ranges from60%to70%.
(5)The removeal rate of CODcr of air flotation is nearly26%, the removeal rate of SS of air flotation is nearly68%. The removeal rate of CODcr of the combination is nearly98.9%, the removeal rate of NH3-N of the combination is nearly84.6%, the removeal rate of SS of the combination is nearly99.6%.
The experiments and practice showed that the main indexes of the final effluent water can reach the discharging limiting numerical value of water pollutants of existing enterprises of discharge standards of water pollutants for pharmaceutical industry fermentation products category(GB21903-2008).
引文
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