Qishan County, Shaanxi Province, board mill is located in Qishan County, Tsai Po Zhen, mainly produces high-strength corrugated paper and yarn tube paper, the output of about 3 × 104ta, Qishan County is one of the larger paper. After discussion by experts, using hydrolytic acidification - aerobic process at the end of 1999, built a capacity to handle 12000m3d wastewater treatment station.
1 effluent water quality and quantity of raw materials for paper-making plant straw and paper board, pulp and wheat straw pulping process using lime and hydraulic crushing of waste paper plates, of which the amount of wheat straw pulp accounted for 75% of the total. Wastewater from cooking, beating and washing machine and other processes, external displacement of about 12000m3d.
2 flow boiling process produces a yellow liquid at high concentrations, biodegradability is poor, so the use of closed circuit, no more than row. Beating the middle of the wastewater and water mixture, the BOD5 COD value of around 0.3, and contains large amounts of lignin, hemi-cellulose, silicon compounds, such as refractory materials, the need to improve their acidification by hydrolysis may be conducted subsequent to aerobic biological treatment of . Process shown in Figure 1. Water residence time regulate force 1h. Advection sedimentation tank of effective water depth of 4.5m, hydraulic retention time of 3h, mud way for mechanical mud. Hydrolysis of the pool structure in the form of groups of multi-bucket up-flow sludge bed, the effective depth of 4.5m, hydraulic retention time of 9h.
activated sludge aeration tank using the traditional method, a dual corridor, pool-type plug-flow type, aeration mode as a unit combined jet aeration, dissolved oxygen controlled at 2mgL pool around the mixture MLSS about 3000mgL, pollution Mud reflux ratio of 40%, volumetric loading for 0.9kGCOD (m3 · d), hydraulic retention time is about 24h. Secondary sedimentation tank for the advection sedimentation tank, the effective depth of 4.0m, hydraulic retention time is about 3h.
normal circumstances, the secondary sedimentation tank effluent can be compliance, but to ensure compliance of effluent water is stable and reliable purification facility that is designed to complement and contact contact oxidation pond filter pond. Contact oxidation pond hydraulic retention time of about 1h, built-in glass fiber reinforced plastic honeycomb filler, contact filtration pond filtration area of 140m2, built-in fill height of 0.75m (pebbles and quartz sand), irrigation method using gravity backwash.
3 commissioning and operation results
debugging focus on the hydrolysis water solution sludge and the cultivation of activated sludge aeration tank. Bacteria are used municipal wastewater treatment plant sludge. Hydrolysis of sludge is the kinds of soil cultivation into the hydrolysis zone, using a continuous water way, into the water gradually increased, in the appropriate environment, hydrolysis of granular sludge will be gradually taking shape. Activated Sludge cultivation and domestication is to first start the part of the aeration equipment and sludge return facilities, regular dosing kinds of mud, dosage generally aeration tank mixed liquor concentrations of 0.5% ~ 1% suitable for nutritional supplements and removal of harmful metabolites of microorganisms growth, we must change the water amount in a timely manner. In the water temperature is 20 ℃ and the environment, adequate nutrition by 2 ~ 3d after the aeration tanks will be a blurring of the floc. Sludge settlement ratio to be 10% ~ 15% of the design load may be a 4,2 4,3 4,4 4 4 phase gradually increase the running load, debug run-time required for routine daily analysis of water quality testing project, need to deal with each load stage are stable over time to improve its load [1].
After 2 months of debugging operation, hydrolyzed sludge and activated sludge were successfully cultured. Commissioning and trial operation three months later, conducted a two-2d-site sampling, monitoring results show that the effluent indicators meet the requirements.
hydrolysis tank assembly precipitation, adsorption, bio-flocculation, bio-degradable in the body, the removal rate of COD in wastewater by 30%, while BOD COD values from 0.30 to 0.35, for the subsequent biological treatment has created conditions. Modular combination of jet aeration tank oxygenation equipment, oxygen transfer efficiency. Through the aeration tank at the entrance to adequate complementary N, P to meet the nutritional needs of micro-organisms, specific dosage BOD5: N: P = 100:5:1 [2], while temperature, pH, organic matter Jieyou beneficial micro-organisms oxidative decomposition of these reasons makes the aeration tank of the COD removal rate of up to 90%.
4 discussion
① treatment effect of temperature on the hydrolysis
as long as the pool water temperature maintained at above 10 ℃ can be achieved good treatment effect, showing that use of acid hydrolysis pretreatment Process lime France pulp and paper wastewater has great advantages. The aerobic metabolism of microorganisms is greatly affected by temperature, is generally believed that biochemical treatment to 20 ~ 30 ℃ best, 15 ~ 35 ℃ feasible, less than 13 ℃ when the water quality deteriorated. Therefore, the winter microbial processing efficiency will be reduced at this time should start to add purification facilities, if necessary, before exposure to filtered pond PAC dosing and polyacrylamide and other chemicals in order to ensure effluent compliance.
② foam generation and control of
aeration tank in the debugging process a large number of Yi bubble, bubble, when too much overflow from the pool surface, thus affecting the operating environment, and carried away large amounts of sludge, while the bubble barrier air, impede oxygenation. The reason for this phenomenon are: water quality fluctuations, when a shock load is easy to produce foam; sewage contains large amounts of surface-active agent; hydrolysis tank contains large amounts of sludge out of the water, seriously affect the aeration tank of the microbial activity. In the run-time debugging can take the following measures to control: to the aeration tank by adding oil and other defoaming substances; using high-pressure water spray defoaming; extension of wastewater residence time in the hydrolysis tanks.
5 Economic Analysis
The total project investment of 600 million yuan, including construction, equipment, process piping, power distribution installation, commissioning a total cost of 4.8 million yuan, and the supporting facilities for a cost of 1.2 million yuan. The average operating costs 0.4 yuan m3.
6 Conclusion
hydrolysis acidification - Aerobic Process lime pulp and paper wastewater treatment has a good effect. The average COD in the influent 2000mgL, BOD5 average 600mgL, SS average 1000mgL, the effluent reached GWPB-1999 The process can effectively improve the biodegradability of waste water and save energy consumption, low operation cost, simple operation, easy to manage.
水解-好氧工艺处理草浆造纸废水
岐山县，陕西省，董事会厂位于岐山县，蔡宝镇，主要生产高强度瓦楞纸和纱管纸，约3 × 104ta输出，岐山县是较大的文件之一。经过专家论证，采用水解酸化在1999年底-好氧工艺，建立了能力处理12000m3d废水处理站。
1出水水质和原材料数量为造纸植物秸秆和纸板，纸浆和草浆造纸过程中使用的石灰和液压废纸板，其中麦草浆占金额为75粉碎％的总。废水做饭，殴打和洗衣机和其他进程，约12000m3d国外流离失所。
2流动沸腾过程中产生高浓度的黄色液体，生物降解性差，所以闭路电视，多行不超过使用。打的废水和水的混合物中，对BOD5的COD值在0.3左右，并含有大量的木质素，半纤维素，硅化合物，如耐火材料，需要改进其可水解酸化后进行好氧生物处理的。过程如图1所示。水调节力停留时间1小时。平流的450万有效水深沉淀池的水力停留时间3小时，机械泥泥方式。在水解的多组队斗升流式污泥床，450万有效的深度，-9水力停留时间池结构。
活性污泥曝气池采用传统方法，双走廊，池型推流式，曝气作为一个单位联合射流曝气方式，解散2mgL周围约3000mgL混合物污泥池，污泥回流污染控制氧气比为40％，而0.9kGCOD（立方米·三维体积负荷），水力停留时间约为24小时。对平流沉淀池，对400万有效深度，水力停留时间二次沉淀池约3小时。
正常情况下，二次沉淀池出水可遵守，但为确保出水水质符合稳定和可靠的净化设施，旨在补充和接触接触氧化池过滤池。接触氧化池约1小时，内置水力停留时间在玻璃钢蜂窝填料，接触过滤池的过滤面积一百四十平方米，内置75万高填充（卵石和石英砂），灌溉方法使用重力冲洗。
3调试和运行调试结果
在水溶液水解污泥的重点和曝气池活性污泥的培养。xj用于城市污水处理厂污泥。污泥水解分为水解区的土壤栽培种，使用连续的水入水的方式，逐渐增多，在适当的环境，颗粒污泥水解将逐步形成。活性污泥培养驯化，是{dy}次启动的曝气设备和污泥回流设施的一部分，经常服用各种泥，用量一般曝气池的混合液0.5％?1％浓度的营养补充和有害的微生物代谢产物的qc适合增长，我们必须改变及时的水量。在水温20℃，环境，营养足，2?3d后的曝气池将是一个模糊的絮体。污泥沉降比为10％?15％的设计荷载可能是4,2 4,3 4,4 4 4阶段逐步提高运行负荷，调试运行例行的水质检测项目的日常分析所需的时间，需要处理每一个阶段，是稳定的负载随着时间的推移，以改善其负载[1]。
经过2个月的调试运行，水解污泥及活性污泥培养成功。调试和试运行3个月后，进行了为期二维现场采样，监测结果表明，出水指标符合要求。
水解池组装沉淀，吸附，生物絮凝，生物体内的降解，在废水中COD去除率达30％，而生化需氧量COD的值从0.30至0.35以后的生物处理创造了条件。模块化组合射流曝气池充氧设备，氧转移效率。在通过适当补充氮，磷，进入曝气池，以满足微生物，特定剂量生化需氧量：无中：p = 100:5:1 [2]的营养需要，同时温度，pH值，有机质解忧有益微生物有机体这些原因使得氧化分解的高达90％COD去除率曝气池。
4讨论
①温度处理对水解的影响
只要泳池的水温在10℃以上，才能实现保持良好的zl效果，表明酸水解预处理工艺使用的石灰法国纸浆和造纸废水具有很大的优势。微生物的有氧代谢是受温度影响很大，一般认为，生化处理20?30℃{zj0}，15?35℃是可行的，不超过13℃时，水质恶化。因此，冬天微生物处理效率会降低，此时应该开始添加净化设施，如有必要才接触到过滤池委员会剂量和聚丙烯酰胺及其他化学品，以确保污水遵守。
②泡沫的产生和控制
曝气在调试过程中易坦克的泡沫，泡沫，大量溢出过多时，从池面，影响了经营环境，带走大量的污泥，而空气泡沫障碍，妨碍氧合。此现象的原因是：水质的波动，冲击负荷时，很容易产生泡沫，污水含有大量的表面活性剂，水解池包含了水的大量污泥，严重影响了曝气池微生物的活动。在运行时调试可以采取以下措施控制：对曝气池，加入油和其他消泡物质;使用高压水喷雾消泡，延长废水水解坦克的停留时间。
5经济分析
的60000.000万元，包括建筑，设备，工艺管道，配电装置，项目总投资，投入了4.8亿元人民币的费用，以及1.2的配套设施费用万元。平均营运成本0.4元立方米。
6结论
水解酸化-好氧工艺处理石灰纸浆和造纸废水处理具有良好的效果。在进水2000mgL平均COD，BOD5的平均600mgL，不锈钢平均1000mgL，达成GWPB - 1999污水“造纸工业水污染物排放标准。”这个过程可以有效地提高废水的可生物降解，节省能源消耗，运行费用低，操作简单，易于管理。06.2.6
Tags: , , ,