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5L机械搅拌发酵种子罐完整使用说明+标准操作SOP

5L机械搅拌发酵种子罐完整使用说明+标准操作SOP



一、设备基础结构与配套部件



1. 罐体主体

5L玻璃/不锈钢罐体,额定装液量3–4L(种子培养推荐装液3L,预留通气、搅拌泡沫空间);夹套水冷/电加热控温;内置搅拌桨、空气分布器、消泡探头。

2. 罐盖接口

搅拌电机、pH电极、DO溶氧电极、温度探头、消泡电极、接种口、取样口、进气口、排气口、酸碱补料口、消泡剂补料口。

3. 控制系统

PLC控制器、搅拌调速、温度自动控温、pH自动酸碱流加、DO联动(转速/通气联动)、罐压显示、蠕动泵(酸/碱/消泡/补料)。

4. 辅机

空压机、0.2μm无菌空气过滤器、循环冷水机、高压蒸汽灭菌锅、火焰接种圈、硅管、管夹、硅胶O圈、电极保护套。

二、使用前安全与检查总则

1. 电源可靠接地,电控、电机、电极接头严禁进水、进蒸汽;灭菌前电极插头套锡纸/防水护套。

2. 所有O型密封圈薄涂食品级硅脂,开裂、硬化立即更换;管路无老化漏液。

3. 空压机输出压力≤0.2MPa,发酵运行罐压稳定0.02–0.05MPa微正压,防止倒吸染菌。

4. 蒸汽灭菌压力≤0.15MPa(121℃),严禁超压。

5. 冷水机提前开机,保证换热冷却能力。

三、完整标准操作流程(分7大阶段)

阶段1:罐体清洗、配培养基、电极预校准

1. 拆罐清洗:罐体、桨叶、管路、取样阀、接种口用去离子水冲洗;蛋白残留用1%NaOH浸泡30min,清水冲净,无肉眼残渣、无异味。

2. 配制种子培养基倒入罐内,定容至工艺体积(≤4L),按需添加消泡剂。

3. 电极初次校准(灭菌前)

- pH电极:两点校准(4.0、6.86/9.18缓冲液),冲洗擦干装入罐盖接口锁紧。

- DO溶氧电极:极化30min,空气斜率校准备用。

4. 密封罐盖:均匀拧紧罐盖螺栓,所有管路夹紧封闭;进气、排气、补料、取样管口用8层纱布+牛皮纸包扎;电极线缆接头锡纸包裹防水汽。

5. 管路封堵:进气、补料、取样硅胶管用管夹夹紧;仅排气口微开泄压。



阶段2:高压蒸汽灭菌(121℃,20–30min)

1. 将整罐平稳放入灭菌锅,放平避免液体溢出。

2. 灭菌程序:升温至121℃,恒温20–30min(芽孢菌延长至30min);全程罐内压力≤0.15MPa。

3. 灭菌结束:缓慢泄压,严禁快速放气造成负压倒吸污染;待灭菌锅压力归零、温度降至80℃以下再取出罐体。

4. 冷却防护:取出后置于发酵台,静置降温,禁止立刻高速搅拌;1h内仅低速≤100rpm运行,防止机械密封干磨异响损坏。

阶段3:设备就位、管路连接、二次DO校准

1. 罐体固定到位,连接夹套循环冷水进出水管,开启冷水机。

2. 无菌空气管路连接:空压机→预过滤器→0.2μm终端无菌滤器→罐进气口;松开进气管夹,排气保持微开,建立罐内0.03MPa正压。

3. 电极接线:pH、DO、温度、消泡电极插头对接控制器,去掉锡纸护套。

4. 控制器开机,输入工艺参数(温度、基础转速、通气量、pH设定)。

5. 溶氧零点+满度校准(运行校准,关键)

- 稳定通气、搅拌运行5min;

- 空气环境下DO校准100%;如需零点可通入氮气校准0%;校准完成锁定。

6. 补料管路排空:酸碱、消泡剂瓶灭菌后连接蠕动泵,排尽管路气泡,管夹夹紧备用。

阶段4:无菌接种(防染菌核心操作)

1. 前置条件:罐温降至菌种适宜温度、罐压稳定0.02–0.03MPa、搅拌低速运行、通气稳定。

2. 降压准备:缓慢关小进气,罐压降至0.01MPa以内,避免开盖喷液。

3. 火焰无菌屏障:接种口套酒精浸润火焰圈,点燃形成完整火焰环,全程不熄火。

4. 开盖操作:火焰保护下旋松接种帽,余气排净后完全取下,盖子始终置于火焰内,不触碰台面。

5. 种子液无菌转移

- 种子瓶外壁75%酒精擦拭,瓶口过火灼烧2–3s;

- 快速倒入种子液(常规接种量5%–10%),避免液体溅到接种口外壁;

- 立刻旋紧接种帽,熄灭火焰圈,开大进气恢复罐压0.03–0.05MPa。

6. 恢复参数:提升搅拌、通气至工艺设定值,开始发酵计时。

阶段5:种子发酵过程监控与参数调节

1. 常规工艺参数参考(通用细菌/真菌种子罐)

- 装液:3L/5L罐

- 通气量:0.5–2 vvm(1.5–6 L/min)

- 搅拌转速:200–800 rpm(需氧菌高转速,厌氧菌低转速)

- 罐压:0.02–0.05 MPa(全程正压)

- pH:自动流加酸碱维持设定值,每2h记录一次;

- DO溶氧:不低于20%,偏低时提高转速、加大通气、适当提升罐压;

- 消泡:泡沫触发探头自动泵入消泡剂,禁止过量添加影响菌体。

2. 取样操作(无菌取样)

1. 取样阀外壁75%酒精擦拭,小火灼烧阀门;

2. 先放掉少量废液冲洗管路,再收集种子液;

3. 取样完成灼烧阀门,关紧管路夹,维持罐内正压。

4. 检测项目:OD600、镜检(有无杂菌)、pH、残糖、菌体形态。

3. 过程记录

每30–60min记录:温度、转速、通气量、罐压、pH、DO、消泡添加量、取样OD;出现DO骤降、pH异常、泡沫突增立即排查染菌或代谢异常。

阶段6:发酵终点放罐、转移二级发酵

1. 种子成熟判定:OD达标、镜检无杂菌、菌体活力良好;

2. 缓慢降低转速、减小通气,罐压降至0.01MPa;

3. 无菌转移:通过出料管路/接种口火焰保护转移至下一级发酵罐,全程保持无菌正压;

4. 放罐完成后立即清洗罐体,禁止培养基长时间滞留结垢。

阶段7:批次后清洗、电极保养、设备收纳

1. 残液排空,罐内加清水低速搅拌冲洗;1%碱水循环搅拌30min去除蛋白、多糖残留,清水冲至中性。

2. 拆卸电极:

- pH电极:冲洗干净,浸泡3M KCl保护液存放;

- DO电极:冲洗擦干,套保湿保护套避光存放;

- 消泡探头、温度探头清水擦拭,晾干。

3. 管路、硅胶管全部拆开冲洗,晾干存放;O圈拆下涂抹硅脂,单独收纳防变形。

4. 排空夹套冷水,关闭冷水机、空压机、控制器总电源;松罐盖螺栓,避免密封圈长期受压永久变形。

5. 长期停用:空罐灭菌一次,擦干内部,盖半开通风存放。



四、关键注意事项(防染菌、防设备损坏)

无菌管控

1. 任何操作(开盖、取样、接种)罐内必须保持正压,绝对禁止负压;

2. 空气过滤器滤芯阻力升高、使用满6个月直接更换,不清洗复用;

3. 硅胶管老化、发白、开裂立即更换,管路无死角积液。

电极保护

1. 电极不可长时间高温灭菌,每次灭菌时间不超30min;

2. 禁止干放pH电极,长期停用浸泡KCl;DO电极严禁干燥存放;

3. 每次实验结束必须清洁电极探头,避免蛋白包裹造成漂移。

机械与密封

1. 灭菌后高温阶段禁止高速搅拌,防止机械密封烧毁、漏液;

2. 搅拌运行异响立刻停机,检查轴封润滑、桨叶紧固;

3. 玻璃罐体避免磕碰,禁用硬质钢丝刷打磨内壁。

安全操作

1. 灭菌、火焰操作配备湿抹布,酒精远离高温电器;

2. 酸碱流加管路防漏,溅洒皮肤立即大量清水冲洗;

3. 设备故障(超温、超压、电机过载)先切断气源、停止搅拌再断电排查。

五、常见故障快速处理

1. 染菌(杂菌检出):管路灭菌不彻底/过滤器失效/接种负压倒吸;更换滤芯,延长灭菌时间,规范火焰接种。

2. DO持续偏低:通气不足、转速过低、培养基粘度大、过滤器堵塞;加大风量、升转速、更换空气滤。

3. pH失控漂移:pH电极污染、未校准;重新清洗、两点校准电极。

4. 搅拌异响、漏液:机械密封高温干磨、O圈老化;更换密封件,灭菌后低速冷却再升速。

5. 泡沫无法控制:消泡探头脏污、消泡剂管路堵塞;清洗探头,疏通补料管路。

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  1. CONNECT:[ UseTime:0.000552s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000738s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000429s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000321s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.000184s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000544s ]
  8. SELECT * FROM `article` WHERE `id` = 826776 LIMIT 1 [ RunTime:0.000798s ]
  9. UPDATE `article` SET `lasttime` = 1786093374 WHERE `id` = 826776 [ RunTime:0.000674s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000208s ]
  11. SELECT * FROM `article` WHERE `id` < 826776 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000393s ]
  12. SELECT * FROM `article` WHERE `id` > 826776 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000417s ]
  13. SELECT * FROM `article` WHERE `id` < 826776 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000764s ]
  14. SELECT * FROM `article` WHERE `id` < 826776 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011160s ]
  15. SELECT * FROM `article` WHERE `id` < 826776 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002089s ]
0.098567s