CN101348289B - 一种l-天门冬氨酸废水循环回用处理工艺 - Google Patents

一种l-天门冬氨酸废水循环回用处理工艺 Download PDF

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CN101348289B
CN101348289B CN2007100256963A CN200710025696A CN101348289B CN 101348289 B CN101348289 B CN 101348289B CN 2007100256963 A CN2007100256963 A CN 2007100256963A CN 200710025696 A CN200710025696 A CN 200710025696A CN 101348289 B CN101348289 B CN 101348289B
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nanofiltration
aspartic acid
waste water
acid waste
circulated
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CN101348289A (zh
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李正华
成云忠
张跃平
郑骏
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Yixing Qiancheng Biological Co., Ltd.
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BIOENGINEERING Co YIXING CITY
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Abstract

一种L-天门冬氨酸废水循环回用处理新工艺，属废水处理与回用技术领域，将L-天门冬氨酸废水在温度小于45℃、操作压力为1.8-2.0Mpa下进行纳滤，去除硫酸根达98％以上、铵离子达50％以上，再将纳滤浓缩液真空浓缩得到主要成份为硫酸铵的结晶，含有部分铵离子的纳滤清液直接循环于L-天门冬氨酸生产配料中和/或再通过反渗透膜处理后作为锅炉蒸汽用水，彻底解决了L-天门冬氨酸废水的氨氮污染问题，同时使生产用水封闭循环，做到零排放，大大节约水资源，整个工艺处理效率高，运行成本低，能耗少。

Description

一种L-天门冬氨酸废水循环回用处理工艺
技术领域
本发明属废水处理与回用技术领域，尤其是指一种L-天门冬氨酸废水循环回用处理工艺。
背景技术
L-天门冬氨酸生产工艺中，因添加氨和硫酸，会生成含有大量硫酸铵的废水，其PH值低，只有3～4，氨氮高，达到10000～20000mg/L。传统的处理方法有：(1)、送到大型污水厂处理，因废水中含氮和硫量高，用生化方法处理效率低，效果差，只能小比例混合进行处理；(2)、真空浓缩，因处理量大，能耗极大。这两种方法均存在设备一次性投资高，难度大，运行成本大的问题，处理水无法回用。
发明内容
本发明正是为了克服上述不足，提供一种L-天门冬氨酸废水循环回用处理工艺，彻底解决了L-天门冬氨酸废水的氨氮污染问题，同时使生产用水封闭循环，做到零排放，大大节约水资源。主要创新在于将L-天门冬氨酸废水用膜法进行浓缩、分离，膜法处理下来的清水质量指标可以达到锅炉用水指标，可以分别用于生产配料和锅炉蒸汽用水，浓水最后通过真空浓缩结晶，提取出含氮固体，综合利用。具体是这样来实施的：一种L-天门冬氨酸废水循环回用处理工艺，其特征在于将L-天门冬氨酸废水在温度小于45℃、操作压力为1.8-2.0MPa下进行纳滤，去除硫酸根达98％以上、铵离子达50％以上，再将纳滤浓缩液真空浓缩得到主要成份为硫酸铵的结晶，含有部分铵离子的纳滤清液直接循环于L-天门冬氨酸生产配料中和/或再通过反渗透膜处理后作为锅炉蒸汽用水。L-天门冬氨酸废水经纳滤后的浓缩液体积大为缩小，真空浓缩负荷大幅度减轻，虽然增加了纳滤成本，但纳滤膜单位处理成本很低，使整个工艺的运行成本大大降低，经处理后，纳滤清液的COD降至50mg/L以下，去除了绝大部份硫酸根，可回用于L-天门冬氨酸生产中循环使用。
本工艺中纳滤采用二级纳滤，二级纳滤工艺能有效分离出硫酸根和铵离子，工艺中采用的纳滤膜的分子量为150-200，一级纳滤控制硫酸根去除率为90％以上，铵离子去除率为40％以上，一级纳滤浓缩液进入真空浓缩，一级纳滤清液进入二级纳滤，二级纳滤浓缩液返回一级纳滤循环，二级纳滤清液循环至L-天门冬氨酸生产配料中和/或再通过反渗透膜处理后作为锅炉蒸汽用水。
本发明把L-天门冬氨酸废水通过纳滤浓缩、分离，彻底解决了L-天门冬氨酸废水的氨氮污染问题，同时使生产用水封闭循环，做到零排放，大大节约水资源，整个工艺处理效率高，运行成本低，能耗少。
具体实施方式
一种L-天门冬氨酸废水循环回用处理工艺，将L-天门冬氨酸废水在温度小于45℃、操作压力为1.8-2.0MPa下进行纳滤，纳滤采用二级纳滤，纳滤膜的分子量为150-200，一级纳滤控制硫酸根去除率为90％以上，铵离子去除率为40％以上，二级纳滤控制硫酸根去除率达98％以上、铵离子去除率达50％以上，一级纳滤浓缩液进入真空浓缩得到主要成份为硫酸铵的结晶，综合利用，一级纳滤清液进入二级纳滤，二级纳滤浓缩液返回一级纳滤循环，含有部分铵离子的二级纳滤清液循环至L-天门冬氨酸生产配料中和/或再通过反渗透膜处理后作为锅炉蒸汽用水。

Claims (3)

1.一种L-天门冬氨酸废水循环回用处理工艺，其特征在于将L-天门冬氨酸废水在温度小于45℃、操作压力为1.8-2.0MPa下进行纳滤，去除硫酸根达98％以上、铵离子达50％以上，再将纳滤浓缩液真空浓缩得到主要成份为硫酸铵的结晶，含有部分铵离子的纳滤清液直接循环于L-天门冬氨酸生产配料中和/或再通过反渗透膜处理后作为锅炉蒸汽用水。
2.根据权利要求1所述的L-天门冬氨酸废水循环回用处理工艺，其特征在于纳滤采用二级纳滤，一级纳滤控制硫酸根去除率为90％以上，铵离子去除率为40％以上，一级纳滤浓缩液进入真空浓缩，一级纳滤清液进入二级纳滤，二级纳滤浓缩液返回一级纳滤循环，二级纳滤清液循环至L-天门冬氨酸生产配料中和/或再通过反渗透膜处理后作为锅炉蒸汽用水。
3.根据权利要求1或2所述的L-天门冬氨酸废水循环回用处理工艺，其特征在于纳滤膜的分子量为150-200。
CN2007100256963A 2007-08-14 2007-08-14 一种l-天门冬氨酸废水循环回用处理工艺 Active CN101348289B (zh)

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CN101987765B (zh) * 2009-08-07 2012-06-27 无锡尚德太阳能电力有限公司 一种污水处理方法以及该处理方法所用的系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6258572B1 (en) * 1998-05-22 2001-07-10 Dsm Fine Chemicals Austria Nfg Gmbh & Cokg Process for preparing L-aspartic acid
CN1336333A (zh) * 2001-09-25 2002-02-20 清华同方股份有限公司 利用膜分离处理大豆加工废水的方法
CN1752036A (zh) * 2005-08-05 2006-03-29 武汉湖工大膜技术开发有限公司 大豆乳清废水处理方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6258572B1 (en) * 1998-05-22 2001-07-10 Dsm Fine Chemicals Austria Nfg Gmbh & Cokg Process for preparing L-aspartic acid
CN1336333A (zh) * 2001-09-25 2002-02-20 清华同方股份有限公司 利用膜分离处理大豆加工废水的方法
CN1752036A (zh) * 2005-08-05 2006-03-29 武汉湖工大膜技术开发有限公司 大豆乳清废水处理方法

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JP特开2007-21440A 2007.02.01

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