CN108456700A - 一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法 - Google Patents
一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法 Download PDFInfo
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Abstract
本发明涉及一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法,属于微藻生物技术领域。本发明用水稀释糖蜜废醪液至pH值为4.4~5.0,作为微藻培养的基础培养基,然后加入MgSO4至培养基中Mg2+的含量为400~1600μmol/L,采用NaOH溶液调节培养基的pH值为6.8~7.0,灭菌处理得到微藻培养基;将微藻接入微藻培养基中进行光照摇瓶培养,其中光照摇瓶培养的温度为24~26℃、光照强度为2400~2800lux,摇床转速为145~155r/min;将微藻培养至稳定期后期,利用有机溶剂提取微藻细胞内的油脂。本发明方法操作简单易行,能够有效的利用糖蜜废醪液提高微藻的生物量和油脂含量,降低了生产成本,减少环境污染。
Description
技术领域
本发明涉及一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法,属于微藻生物技术领域。
背景技术
生物柴油是指以动植物、微生物油脂及废餐饮油等为原料油,通过酯交换工艺制成的甲酯或乙酯燃料。与常规柴油相比,它具有可再生、易降解、燃烧后污染物排放低、温室气体排放低等特点。
微藻具备固碳和产油的功能。利用微藻制备生物柴油具有诸多优势:(1)生产效率高,通常是其它油料作物的10~100倍;(2)光合效率高;(3)脂质与淀粉的含量高;(4)不与粮食作物争地;(5)可利用废水,净化环境;(6)生产周期短,全年不间断生产等。因此,利用微藻制备生物柴油具有广阔的应用前景。
糖蜜废醪液是甘蔗或甜菜糖厂在精制糖产品过程中,排出的无毒、有害、污染负荷高的废水,呈酸性,其化学耗氧量 (COD) 达 4000~50000 mg/L,生物需氧量(BOD)达20000~30000 mg/L,直接排放会严重破坏生态平衡。糖蜜废醪液中含有大量的营养物质,氨氮1500~2500 mg/L,其中还含有许多氨基酸、蛋白质、糖类以及 Na、K、Ca、Mg、P 、Fe、Zn等矿物元素,其固形物含量为 8~10%,有机物质占70 %左右。
云南省是全国主要蔗糖产地之一,全省拥有80多家制糖企业,遍布全省14个地州,涉及40多个县。这些糖厂都附设有酒精生产车间,但其生产过程中会产生大量的酸性高浓度有机废水 , 具有潜在的危害性。一个配有日产量为20 t酒精生产能力的糖厂,其排放的酒精生产废水污染负荷,相当于一个40万人口的城市排放生活污水的污染负荷,会造成水体富营养化、缺氧、鱼虾绝迹、水质恶化、发臭,严重污染地表地下水。如酒精生产排放的废水污染负荷是云南最主要的水污染源,占云南废水排放污染负荷总量约40%。
如何对酒精废醪液进行经济有效的治理,至今仍是糖厂污染治理的一个难题。目前处理糖蜜废醪液的一些技术和方法,包括(1)厌氧发酵处理后,悬浮物(ss)和化学需氧量(COD)的去除率均可达80%以上,达到排放标准,但其中的营养成分流失无法利用。(2)糖蜜废醪液可用于发酵沼气,沼渣可用作肥料灌溉农田,但容易引起土壤酸化和板结,有刺鼻气味,污染空气。
目前尚未有利用糖蜜废醪液来提高微藻中油脂的方法。
发明内容
针对上述现有技术存在的问题及不足,本发明提供一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法,本发明方法采用糖蜜废醪液作为基础培养基培养微藻生产生物柴油,可解决糖蜜废醪液的处理问题,还能带来经济效益,实了“变废为宝”。
一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法,具体步骤如下:
(1)培养基的制备:用水稀释糖蜜废醪液至pH值为4.4~5.0,作为微藻培养的基础培养基,然后加入MgSO4至培养基中Mg2+的含量为400~1600 μmol/L,采用NaOH溶液调节培养基的pH值为6.8~7.0,灭菌处理得到微藻培养基;
(2)微藻培养:将微藻接入步骤(1)的微藻培养基中进行光照摇瓶培养,其中光照摇瓶培养的温度为24~26℃、光照强度为2400~2800 lux,摇床转速为145 ~155 r/min;
(3)微藻中油脂的提取:将步骤(2)的微藻培养至稳定期后期,利用有机溶剂提取微藻细胞内的油脂;
所述微藻为单针藻菌株Monoraphidium sp. FXY-10(NCBI:JQ809706);
所述步骤(2)中微藻的初始接种量为0.095~0.105 g/L;
所述步骤(3)中有机溶剂为氯仿-甲醇溶液,氯仿-甲醇溶液中氯仿与甲醇的体积比为2:1;有机溶剂提取藻细胞内的油脂的方法为:将培养液经3400~3600 r/min离心富集5~6min,用蒸馏水反复洗涤2~4次后冻干制成干藻粉,称重;加入石英砂并研磨混匀,再加入氯仿-甲醇溶液重复抽提至藻体发白,离心收集有机相即得油脂;其中石英砂的质量为干藻粉质量的1.9~2.1倍。
本发明的有益效果为:
(1)本发明利用糖蜜废醪液培养微藻,可节约资源,降低生产成本,提高微藻中的油脂含量,糖蜜废醪液实现了零排放,有利于环境的保护;将糖蜜废醪液的处理与微藻产油结合起来,提高了资源的利用率,变废为宝;
(2)本发明与单独利用糖蜜废醪液培养基的相比,到达稳定期后,当Mg2+浓度为800 μM时,油脂含量最高,达到细胞干重的59.58%,提高了25.99%;同时,生物量达到最大,较不添加Mg2+的糖蜜废醪液(0.5705 g/L)培养也提高了58.44%,最终达到0.9044 g/L;
(3)本发明中糖蜜废醪液中添加Mg2+,产油微藻便能较好的生长,不但解决了糖蜜废醪液的处理问题,保护了环境,而且将废弃物资源化,同时节约了资源;Mg2+的添加促进了微藻对糖蜜废醪液中营养成分的吸收及油脂的合成,微藻在添加Mg2+的糖蜜废醪液中生长,增加了生物量和油脂含量。
附图说明
图1为对比例1与实施例1~4的微藻油脂含量和生物量示图。
具体实施方式
下面结合具体实施方式,对本发明作进一步说明。
本发明的对比例和实施例采用的微藻为单针藻菌株Monoraphidium sp. FXY-10(NCBI:JQ809706)。
对比例1:一种利用糖蜜废醪液提高微藻中油脂的方法,具体步骤如下:
(1)培养基的制备:用水稀释糖蜜废醪液至pH值为4.4,作为微藻培养的基础培养基,采用NaOH溶液调节培养基的pH值为6.8,灭菌处理得到微藻培养基;
(2)微藻培养:将微藻接入步骤(1)的微藻培养基中进行光照摇瓶培养,其中光照摇瓶培养的温度为24℃、光照强度为2500lux,摇床转速为150r/min;微藻的初始接种量为0.1g/L;
(3)微藻中油脂的提取:将步骤(2)的微藻培养至稳定期后期,利用有机溶剂提取微藻细胞内的油脂;其中有机溶剂为氯仿-甲醇溶液,氯仿-甲醇溶液中氯仿与甲醇的体积比为2:1;有机溶剂提取藻细胞内的油脂的方法为:将培养液经3500r/min离心富集5min,用蒸馏水反复洗涤2次后冻干制成干藻粉,称重;加入石英砂并研磨混匀,再加入氯仿-甲醇溶液重复抽提至藻体发白,离心收集有机相即得油脂;其中石英砂的质量为干藻粉质量的2.0倍;
本对比例的油脂含量达细胞干重的47.29 %,生物量为0.57 g/L(见图1)。
实施例1:一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法,具体步骤如下:
(1)培养基的制备:用水稀释糖蜜废醪液至pH值为4.4,作为微藻培养的基础培养基,然后加入MgSO4至培养基中Mg2+的含量为400μmol/L,采用NaOH溶液调节培养基的pH值为6.8,灭菌处理得到微藻培养基;
(2)微藻培养:将微藻接入步骤(1)的微藻培养基中进行光照摇瓶培养,其中光照摇瓶培养的温度为24℃、光照强度为2500lux,摇床转速为150r/min;微藻的初始接种量为0.1g/L;
(3)微藻中油脂的提取:将步骤(2)的微藻培养至稳定期后期,利用有机溶剂提取微藻细胞内的油脂;其中有机溶剂为氯仿-甲醇溶液,氯仿-甲醇溶液中氯仿与甲醇的体积比为2:1;有机溶剂提取藻细胞内的油脂的方法为:将培养液经3500r/min离心富集5min,用蒸馏水反复洗涤2次后冻干制成干藻粉,称重;加入石英砂并研磨混匀,再加入氯仿-甲醇溶液重复抽提至藻体发白,离心收集有机相即得油脂;其中石英砂的质量为干藻粉质量的2.0倍;从表1可知,本实施例的油脂含量达细胞干重的53.39%,生物量为0.8376g/L(见图1);添加Mg2+可提高微藻生物量和油脂含量,生物量为对比例1的1.47倍,藻细胞油脂含量较对比例1增加了12.90%。
实施例2:一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法,具体步骤如下:
(1)培养基的制备:用水稀释糖蜜废醪液至pH值为4.6,作为微藻培养的基础培养基,然后加入MgSO4至培养基中Mg2+的含量为800μmol/L,采用NaOH溶液调节培养基的pH值为6.9,灭菌处理得到微藻培养基;
(2)微藻培养:将微藻接入步骤(1)的微藻培养基中进行光照摇瓶培养,其中光照摇瓶培养的温度为25℃、光照强度为2500lux,摇床转速为150r/min;微藻的初始接种量为0.1g/L;
(3)微藻中油脂的提取:将步骤(2)的微藻培养至稳定期后期,利用有机溶剂提取微藻细胞内的油脂;其中有机溶剂为氯仿-甲醇溶液,氯仿-甲醇溶液中氯仿与甲醇的体积比为2:1;有机溶剂提取藻细胞内的油脂的方法为:将培养液经3500r/min离心富集5min,用蒸馏水反复洗涤3次后冻干制成干藻粉,称重;加入石英砂并研磨混匀,再加入氯仿-甲醇溶液重复抽提至藻体发白,离心收集有机相即得油脂;其中石英砂的质量为干藻粉质量的1.9倍;本实施例的油脂含量达细胞干重的59.58%,生物量为0.9044g/L(见图1);添加Mg2+可提高微藻生物量和油脂含量,生物量为对比例1的1.58倍,藻细胞油脂含量较对比例1增加了25.99%。
实施例3:一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法,具体步骤如下:
(1)培养基的制备:用水稀释糖蜜废醪液至pH值为5.0,作为微藻培养的基础培养基,然后加入MgSO4至培养基中Mg2+的含量为1200μmol/L,采用NaOH溶液调节培养基的pH值为7.0,灭菌处理得到微藻培养基;
(2)微藻培养:将微藻接入步骤(1)的微藻培养基中进行光照摇瓶培养,其中光照摇瓶培养的温度为26℃、光照强度为2500lux,摇床转速为150r/min;微藻的初始接种量为0.1g/L;
(3)微藻中油脂的提取:将步骤(2)的微藻培养至稳定期后期,利用有机溶剂提取微藻细胞内的油脂;其中有机溶剂为氯仿-甲醇溶液,氯仿-甲醇溶液中氯仿与甲醇的体积比为2:1;有机溶剂提取藻细胞内的油脂的方法为:将培养液经3500r/min离心富集5min,用蒸馏水反复洗涤3次后冻干制成干藻粉,称重;加入石英砂并研磨混匀,再加入氯仿-甲醇溶液重复抽提至藻体发白,离心收集有机相即得油脂;其中石英砂的质量为干藻粉质量的1.9倍;本实施例的油脂含量达细胞干重的57.61%,生物量为0.8483g/L(见图1);添加Mg2+可提高微藻生物量和油脂含量,生物量为对比例1的1.48倍,藻细胞油脂含量较对比例1增加了21.82%。
实施例4:一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法,具体步骤如下:
(1)培养基的制备:用水稀释糖蜜废醪液至pH值为5.0,作为微藻培养的基础培养基,然后加入MgSO4至培养基中Mg2+的含量为1600μmol/L,采用NaOH溶液调节培养基的pH值为7.0,灭菌处理得到微藻培养基;
(2)微藻培养:将微藻接入步骤(1)的微藻培养基中进行光照摇瓶培养,其中光照摇瓶培养的温度为26℃、光照强度为2500lux,摇床转速为150r/min;微藻的初始接种量为0.1g/L;
(3)微藻中油脂的提取:将步骤(2)的微藻培养至稳定期后期,利用有机溶剂提取微藻细胞内的油脂;其中有机溶剂为氯仿-甲醇溶液,氯仿-甲醇溶液中氯仿与甲醇的体积比为2:1;有机溶剂提取藻细胞内的油脂的方法为:将培养液经3500 r/min离心富集5min,用蒸馏水反复洗涤3次后冻干制成干藻粉,称重;加入石英砂并研磨混匀,再加入氯仿-甲醇溶液重复抽提至藻体发白,离心收集有机相即得油脂;其中石英砂的质量为干藻粉质量的1.9倍;本实施例的油脂含量达细胞干重的54.78%,生物量为0.8444g/L(见图1);添加Mg2+可提高微藻生物量和油脂含量,生物量为对比例1的1.48倍,藻细胞油脂含量较对比例1增加了15.84%。
结果表明,适当的增加糖蜜废醪液中Mg2+浓度可以促进微藻的生长和油脂的积累,Mg2+可以促进磷酸烯醇式丙酮酸羧化酶催化磷酸烯醇式丙酮酸与HCO3 -反应,促进微藻的生长,同时为微藻的三羧酸循环提供了大量的草酰乙酸;Mg2+可以提高ACCase的活性,由ACCase催化乙酰-CoA转化为丙二酸单酰辅酶A,ACCase的浓度和活性的影响脂肪酸合成。
Claims (4)
1.一种利用糖蜜废醪液和镁离子提高微藻中油脂的方法,其特征在于,具体步骤如下:
(1)培养基的制备:用水稀释糖蜜废醪液至pH值为4.4~5.0,作为微藻培养的基础培养基,然后加入MgSO4至培养基中Mg2+的含量为400~1600 μmol/L,采用NaOH溶液调节培养基的pH值为6.8~7.0,灭菌处理得到微藻培养基;
(2)微藻培养:将微藻接入步骤(1)的微藻培养基中进行光照摇瓶培养,其中光照摇瓶培养的温度为24~26℃、光照强度为2400~2800 lux,摇床转速为145~155r/min;
(3)微藻中油脂的提取:将步骤(2)的微藻培养至稳定期后期,利用有机溶剂提取微藻细胞内的油脂。
2.根据权利要求1所述利用糖蜜废醪液和镁离子提高微藻中油脂的方法,其特征在于:微藻为单针藻菌株Monoraphidium sp. FXY-10(NCBI:JQ809706)。
3.根据权利要求1所述利用褪黑素联合缺氮促进异养微藻油脂积累的方法,其特征在于:步骤(2)中微藻的初始接种量为0.095~0.105 g/L。
4.根据权利要求1所述利用糖蜜废醪液和镁离子提高微藻中油脂的方法,其特征在于:步骤(3)中有机溶剂为氯仿-甲醇溶液,氯仿-甲醇溶液中氯仿与甲醇的体积比为2:1;有机溶剂提取藻细胞内的油脂的方法为:将培养液经3400~3600 r/min离心富集5~6 min,用蒸馏水反复洗涤2~4次后冻干制成干藻粉,称重;加入石英砂并研磨混匀,再加入氯仿-甲醇溶液重复抽提至藻体发白,离心收集有机相即得油脂;其中石英砂的质量为干藻粉质量的1.9~2.1倍。
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