WO2010142147A1 - 生物制浆造纸废水零排放工艺 - Google Patents

生物制浆造纸废水零排放工艺 Download PDF

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Publication number
WO2010142147A1
WO2010142147A1 PCT/CN2010/001085 CN2010001085W WO2010142147A1 WO 2010142147 A1 WO2010142147 A1 WO 2010142147A1 CN 2010001085 W CN2010001085 W CN 2010001085W WO 2010142147 A1 WO2010142147 A1 WO 2010142147A1
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Prior art keywords
tank
treatment
wastewater
cooking
middle water
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PCT/CN2010/001085
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English (en)
French (fr)
Inventor
李敬民
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汇鑫生物浆纸股份有限公司
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Publication of WO2010142147A1 publication Critical patent/WO2010142147A1/zh

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0085—Introduction of auxiliary substances into the regenerating system in order to improve the performance of certain steps of the latter, the presence of these substances being confined to the regeneration cycle
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)

Definitions

  • the invention belongs to the field of papermaking technology.
  • Tianjin Wanli Natural Fiber Film Co., Ltd. can realize the recycling of water by using waste paper to produce corrugated base paper, but the number of wastewater circulation is limited, and the annual output does not exceed 100,000 tons, and its After the waste water circulation, the quality of the product is seriously affected, so that the quality of its products is in the quality grade of GB/T13023-2008 standard, it is difficult to improve.
  • the present invention provides a novel zero-discharge process for biological pulping and papermaking wastewater, to solve the difficulty of black liquor treatment, high treatment cost of the middle-stage wastewater, reduce environmental pollution, save water resources, and reduce production costs.
  • the technical solution adopted by the invention to solve the technical problem is: first, adjusting the cooking process, reducing the cooking pressure, reducing from the original 0.8 Mpa to the current 0.3-0.4 Mpa, reducing the cooking temperature to 130-140 ° C, cooking The time is shortened by 1.5 hours, which effectively reduces the slurry dissolution and reduces the COD content of the middle water.
  • the improved middle water treatment process firstly, the rotary mixing in the biological aeration tank is based on the original water treatment process. The aerator is transformed into a suspended aeration chain device, which improves the oxygen conversion efficiency by 5-10%, increases the dissolved oxygen content in the wastewater, and improves the removal rate of organic matter in the wastewater without increasing the power.
  • the middle-stage water treatment routine is broken, and the middle-stage water is treated twice, so that all the treated wastewater can be reused.
  • the specific process is that the middle-stage wastewater is filtered through the inclined net to recover the fiber and then enters the radial flow sedimentation tank for precipitation treatment, removes the suspended matter in the waste water, enters the pre-sinking tank to further remove the suspended matter, and then enters the hydrolysis acidification tank to remove the macromolecular organic pollutants.
  • the materialized treatment, and then into our own advanced treatment system for treatment, the effluent enters the reuse pool, and all the reuse pumps are sent back to the production workshop to achieve complete reuse and zero discharge of the middle water.
  • the positive effect of adopting the invention is that the black liquor recycling is realized, the middle water is discharged zero, the problem of large water consumption of the paper machine is solved, the water resource is saved, the environmental pollution is saved, and the non-wood fiber papermaking enterprise is provided for reference. With the successful experience of sustainable development, there is an extremely realistic and long-term promotion and utilization value.
  • the middle section of water treatment the biodegradability of the middle section of paper determines the processing and processing results.
  • the rotary mixing aerator in the biological aeration tank is transformed into a suspended aeration chain device, so that the oxygen conversion efficiency is improved by 5-10%, and the wastewater is increased.
  • the dissolved oxygen content increases the removal rate of organic matter in the wastewater without increasing the power.
  • the treatment process of the middle water is broken, and the middle water is treated twice, so that all the treated wastewater can be reused.
  • the specific process is that the middle-stage wastewater is filtered through the inclined net to recover the fiber and then enters the radial flow sedimentation tank for precipitation treatment, removes the suspended matter in the waste water, enters the pre-sinking tank to further remove the suspended matter, and then enters the hydrolysis acidification tank to remove the macromolecular organic pollutants.
  • the homogenization tank is partially pumped to the biochemical sludge concentration tank, and then enters the post-flocculation sedimentation tank for secondary physicochemical treatment (the produced sludge is returned to the sludge concentration tank), and then enters our own modified deep treatment system for treatment.
  • the effluent enters the reuse pool and is returned to the production workshop by the recycled water pump, thereby realizing the complete reuse of the middle water and zero discharge.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Activated Sludge Processes (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Paper (AREA)
  • Biological Treatment Of Waste Water (AREA)

Description

生物制浆造纸废水零排放工艺 生物制浆造纸废水零排放工艺
技术领域
本发明属于造纸技术领域。
背景技术
目前，造纸行业中使用草浆造纸的企业因受到污染治理困难和国家造纸产业政策的优化、调整的限制，使得许多草浆造纸企业处于进退维谷之地。国家造纸工业水污染物排放标准在年年降低，造成造纸企业废水处理成本在不断上升，往往还很难达标排放。许多企业在苦苦找寻造纸废水不外排的工艺方法，至今还在探索阶段。
与本发明相近的现有技术是天津万利天然纤维薄膜有限公司利用废纸生产瓦楞原纸可以实现水的循环使用技术，但是其废水循环数量受到一定限制，年产没有超过10万吨的，并且其废水循环后对产品质量影响严重，使得其产品质量处在GB/T13023-2008标准中的合格品档次，很难再提高。
发明内容
为克服现有技术的不足，本发明提供一种新型生物制浆造纸废水零排放工艺，以解决黑液处理困难，中段废水处理费用高，减少环境污染，节约水资源，降低生产成本。
本发明解决其技术问题所采用的技术方案是：第一、调整蒸煮工艺，降低蒸煮压力，由原来的0.8Mpa降低到现在的0.3-0.4Mpa、使蒸煮温度降低到130-140℃、把蒸煮时间缩短了1.5小时，从而有效地减少了浆料溶出物，减少中段水的COD含量；第二、改进中段水处理工艺：首先在原来水处理工艺的基础上将生物曝气池中的旋混式曝气器改造为悬挂式曝气链装置，使得氧气的转换效率提高了5-10%，增加了废水中的溶解氧含量，在不增加动力的情况下提高了废水中有机物的去除率。同时打破中段水处理常规流程，对中段水处理两次，从而使处理后的废水全部能够回用。具体工艺是中段废水经过斜网过滤回收纤维后进入辐流式沉淀池进行沉淀处理，除去废水中的悬浮物质，进入预沉池进一步除去悬浮物质后，进水解酸化池去除大分子有机污染物质，在该池中按BOD:N:P=100:5:1加入过磷酸钙，进入曝气池进行生化处理，进入澄清池沉淀去除生化处理产生的悬浮物质，再进入后絮凝沉淀池进行二级物化处理，再进入到我们自己改造的深度处理系统进行处理，出水进入回用水池，由回用水泵全部送回到生产车间使用，从而实现中段水的完全回用，零排放。
采用本发明的积极效果是：实现了黑液循环利用，中段水零排放，解决了纸机清水用量大的难题，节约水资源，减少环境污染，为非木纤维造纸企业提供了可借鉴的生存与可持续发展的成功经验，有极为现实和长远的推广、利用价值。
具体实施方式
以生物制浆生产瓦楞原纸为例，本工艺具体实施工序如下：
1、蒸煮工艺改造：对棉杆原料进行蒸煮，在原有的蒸煮工艺基础上，降低蒸煮压力，由原来的0.8Mpa降低到现在的0.35Mpa、使蒸煮温度降低到135℃、把蒸煮时间缩短了1.5小时，使得粗浆达到75%左右的得率，并且有效地控制了浆料的溶出物，从而减少了中段水中COD的含量，为中段水的处理、回用打下了坚实的基础。
2、中段水处理：造纸中段水的可生化性决定着其处理工艺和处理后的结果。经过化验分析生物浆造纸所产生的中段水其BOD:COD=0.58,而城市生活污水的BOD:COD=0.45，由此可见生物制浆造纸中段水的可生化性比城市生活污水的可生化性还好。根据此特性，在原来水处理工艺的基础上将生物曝气池中的旋混式曝气器改造为悬挂式曝气链装置，使得氧气的转换效率提高了5-10%，增加了废水中的溶解氧含量，在不增加动力的情况下提高了废水中有机物的去除率。将中段水的处理流程打破常规，对中段水处理两次，从而使处理后的废水全部能够回用。具体工艺是中段废水经过斜网过滤回收纤维后进入辐流式沉淀池进行沉淀处理，除去废水中的悬浮物质，进入预沉池进一步除去悬浮物质后，进水解酸化池去除大分子有机污染物质，在该池中按BOD:N:P=100:5:1加入过磷酸钙，进入曝气池进行生化处理，进入澄清池沉淀去除生化处理产生的悬浮物质（产生的生化污泥一部分回流到均质池，一部分抽到生化污泥浓缩池），再进入后絮凝沉淀池进行二级物化处理（产生的污泥回流到污泥浓缩池），再进入到我们自己改造的深度处理系统进行处理，出水进入回用水池，由回用水泵全部送回到生产车间使用，从而实现中段水的完全回用，零排放。

Claims (1)

  1. 一种生物制浆造纸废水零排放工艺，其特征是该工艺包括：
    （1）蒸煮工序：调整蒸煮工艺，降低蒸煮压力，由原来的0.8Mpa降低到现在的0.3-0.4Mpa、使蒸煮温度降低到130-140℃、把蒸煮时间缩短了1.5小时，从而有效地减少了浆料溶出物，减少中段水的COD含量；
    （2）中段水处理工序：将生物曝气池中的旋混式曝气器改造为悬挂式曝气链装置，使得氧气的转换效率提高了5-10%，增加了废水中的溶解氧含量，在不增加动力的情况下提高了废水中有机物的去除率；同时打破中段水处理常规流程，对中段水处理两次，从而使处理后的废水全部能够回用；具体工艺是中段废水经过斜网过滤回收纤维后进入辐流式沉淀池进行沉淀处理，除去废水中的悬浮物质，进入预沉池进一步除去悬浮物质后，进水解酸化池去除大分子有机污染物质，在该池中按BOD:N:P=100:5:1（mg/L）加入过磷酸钙，进入曝气池进行生化处理，进入澄清池沉淀去除生化处理产生的悬浮物质，再进入后絮凝沉淀池进行二级物化处理，再进入到深度处理系统进行处理，出水进入回用水池，由回用水泵全部送回到生产车间使用，从而实现中段水的完全回用，零排放。
PCT/CN2010/001085 2009-06-13 2010-07-19 生物制浆造纸废水零排放工艺 WO2010142147A1 (zh)

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CN114349271A (zh) * 2021-12-27 2022-04-15 莆田市超淇纸业有限公司 一种彩色薄页纸废水零排放的处理方法

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CN105884138B (zh) * 2016-06-06 2018-09-25 中国石油大学(华东) 一种抗生素污水处理方法及装置

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CN114349271A (zh) * 2021-12-27 2022-04-15 莆田市超淇纸业有限公司 一种彩色薄页纸废水零排放的处理方法
CN114349271B (zh) * 2021-12-27 2023-12-29 莆田市超淇纸业有限公司 一种彩色薄页纸废水零排放的处理方法

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