WO2022082955A1 - 一种利用气浮预处理+生化+双膜法处理并回用机加工废水的系统及方法 - Google Patents

一种利用气浮预处理+生化+双膜法处理并回用机加工废水的系统及方法 Download PDF

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WO2022082955A1
WO2022082955A1 PCT/CN2020/134584 CN2020134584W WO2022082955A1 WO 2022082955 A1 WO2022082955 A1 WO 2022082955A1 CN 2020134584 W CN2020134584 W CN 2020134584W WO 2022082955 A1 WO2022082955 A1 WO 2022082955A1
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pool
water
air flotation
tank
wastewater
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French (fr)
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阮在高
黄开龙
杨庆
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南京江岛环境科技研究院有限公司
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor

Definitions

  • the invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a system and method for treating and reusing machining wastewater by utilizing air flotation pretreatment + biochemical + double membrane method.
  • the domestic machining production wastewater treatment process is mainly based on biological methods. Most enterprises build their own sewage treatment stations, but the treatment effect is not good, and there are not many that can stably meet the requirements of reuse.
  • the physical treatment technology of machining production wastewater mainly includes air flotation, adsorption and coagulation, mainly to remove oil, color and COD.
  • Dissolved air flotation is used in the air flotation method.
  • the air sent to the air tank by the air compressor is brought into the dissolved air tank through the jet device, and is forced to be dissolved in water under the pressure of 0.35MPa to form dissolved air water, which is sent to the air flotation. in the slot.
  • the air dissolved in the water is precipitated to form a large number of micro-bubble groups, which fully contact with the suspended solids in the pumped and flocculated sewage after dosing, and are adsorbed in the slowly rising process.
  • the flocculated suspended matter reduces its density and floats to the water surface to achieve the purpose of removing SS, COD and oil.
  • the adsorption method is to use an adsorbent with strong adsorption capacity, so that one or several components in the wastewater are adsorbed on the surface.
  • adsorption method is mainly used in pretreatment and advanced treatment. Different adsorbents have different selectivity for wastewater adsorption, but usually the adsorbent has good adsorption effect, high cost, and difficult regeneration process.
  • Coagulation is one of the physicochemical treatment methods often used for machining wastewater.
  • the coagulation method mainly realizes the separation of mud and water in the sedimentation tank after flocculating the macromolecular organic matter into flocs.
  • the coagulation method has the advantages of simple process, low cost and high treatment efficiency for insoluble suspended solids.
  • the removal effect of organic matter with high water solubility is poor, and the amount of sludge is large and requires subsequent treatment.
  • the biological method is mainly to oxidize and degrade macromolecular organic matter into small molecular organic matter through microbial anaerobic reaction, and at the same time, the fermentation reaction converts organic C into methane, and at the same time, combined with other biochemical processes, ammonia nitrogen is removed.
  • Membrane method mainly uses ultrafiltration membranes, reverse osmosis membranes and other membranes to achieve efficient removal of pollutants and deep desalination.
  • the main purpose of the present invention is to remove oil and COD from machining wastewater, which will have a greater impact on the service life of subsequent membranes and the time of fouling and blockage. Frequent backwashing and membrane replacement will bring great harm to enterprises. Large labor costs, pharmaceutical costs and membrane replacement costs, provide a system and method for treating and reusing machining wastewater by using gas separation and flotation pretreatment + A/O + MBR + ultrafiltration + reverse osmosis, which can realize machining production wastewater. efficient and stable treatment and reuse.
  • a method for treating machining production wastewater by a system of utilizing air flotation pretreatment + biochemical + double membrane method to treat and reuse machining wastewater it is characterized in that: said utilizing air flotation pretreatment + biochemical + double membrane Membrane treatment and reuse of machining wastewater systems include waste water collection tanks, oil separators, air flotation tanks, A/O biochemical tanks, MBR tanks, intermediate water tanks, ultrafiltration systems, reverse osmosis systems, concentrate treatment systems, and sewage treatment systems.
  • a mud treatment system; the A/O biochemical pond comprises a facultative aerobic pond and an aerobic pond connected in sequence; the method comprises the following steps:
  • the waste water in the intermediate pool is lifted to the ultrafiltration system by the high pressure pump, the ultrafiltration effluent enters the primary RO system, the concentrated water of the primary RO system enters the tertiary RO system, the fresh water enters the secondary RO system, and the The concentrated water is returned to the primary RO system for treatment, the fresh water of the tertiary RO enters the secondary RO system, the concentration of the tertiary RO is treated as hazardous waste, and the fresh water treated by the secondary RO system is reused after ultraviolet disinfection.
  • the aforementioned method is characterized in that: in the step (2), the reaction zone of the air flotation tank is divided into three compartments, and the waste water from the collection tank is lifted into the first compartment by a lifting pump, and the pH value is controlled to 8 ⁇ 9.
  • the water from the first grid enters the second grid
  • the flocculant PAC is added to the second grid
  • the water from the second grid enters the third grid
  • the anionic high molecular weight PAM is added to the third grid to strengthen the coagulation effect and react.
  • the effluent enters the air flotation area, through the air flotation reaction, the upper part removes the suspended solids and oil, the lower part settles the particulate matter, and the middle part clears the water into the A/O system.
  • the aforementioned method is characterized in that: in the A/O treatment system of the step (2), the reflux ratio of the nitrification solution is controlled at 200-300%.
  • the aforementioned method is characterized in that: in the step (3), the sludge return ratio of the MBR tank is controlled at 50-150%.
  • the aforementioned method is characterized in that: in the MBR treatment system in the step (3), the MBR membrane adopts a submerged flat plate membrane, and the membrane flux is 0.2-0.3 m 3 /m 2 .d.
  • the aforementioned method is characterized in that the COD of the influent water of the whole system does not exceed 5000 mg/L, and the salt concentration does not exceed 6000 mg/L.
  • the present invention has at least the following advantages:
  • the machining production wastewater of the present invention can effectively guarantee some organic matter, suspended solids and oil content in the wastewater after the pretreatment of the oil separator and the air flotation tank, especially the oil content and organic matter, which can effectively ensure the subsequent biochemical system and membrane. Stable operation of the processing system.
  • the machining wastewater of the present invention enters the A/O system + MBR system after pretreatment, which can effectively remove pollutants such as organic matter and ammonia nitrogen in the wastewater, can effectively ensure the water quality entering the subsequent ultrafiltration and RO system, and effectively ensure the ultrafiltration.
  • the service life and cleaning frequency of the filter membrane and RO can effectively reduce the operating cost of the enterprise, and reduce the replacement and maintenance cost of the ultrafiltration membrane and RO membrane.
  • the machining wastewater of the present invention enters the ultrafiltration and RO system after being treated by the oil separator, the air flotation tank pretreatment, the A/O system and the MBR system, and the ultrafiltration and the three-stage RO system can effectively ensure the wastewater reuse water volume and reduce hazardous waste generation.
  • the special method of the present invention for treating machining production wastewater by using air flotation pretreatment + biochemical + double membrane method to treat and reuse machining wastewater has the advantages of high efficiency, low cost and stability. Oil removal, COD removal and stable operation of the membrane ensure the stable water production and water quality of the membrane system.
  • FIG. 1 is a flow chart of the method of the present invention.
  • FIG. 1 a method for treating machining production wastewater by a system of utilizing air flotation pretreatment + biochemical + double-membrane method to treat and reuse machining wastewater according to a preferred embodiment of the present invention is applied to a foreign capital in Wuxi City, Jiangsu province. Machining enterprise wastewater treatment station.
  • the wastewater treatment station mainly includes wastewater collection tank, oil separator, air flotation tank, anoxic tank, aerobic tank, MBR tank, intermediate water tank, precision filter, ultrafiltration system, primary RO system, secondary RO system, three Grade RO system, low temperature evaporation system, UV disinfection system, sludge treatment system, etc.
  • the processing capacity of the oil separation tank is 60t/d
  • the processing capacity of the air flotation tank is 60t/d.
  • the A/O system consists of the A pool and the O pool in series, and the residence time is 8h and 16h respectively.
  • the A pool is equipped with a stirring system.
  • the O pool is equipped with a microporous aerator; the MBR pool has a residence time of 10h, and is equipped with an aeration system and a submerged MBR flat membrane. Two self-priming pumps are used for negative pressure suction, one is used and the other is prepared.
  • the processing capacity of the ultrafiltration membrane system is 60t/d, and the water after ultrafiltration treatment enters the primary RO system.
  • the processing capacity of the primary RO system is 75t/d, the amount of concentrated water produced is 22.5t/d, and the amount of fresh water produced is 52.5t /d, the 22.5t/d concentrated water produced by the primary RO system enters the tertiary RO system, the tertiary RO system produces 3 t/d of concentrated water, and 22 t/d of fresh water is produced, and the 3 t/d concentrated water produced by the tertiary RO enters the low temperature In the evaporation system, 22t/d of fresh water produced by the third-stage RO enters the second-stage RO system.
  • the processing capacity of the second-stage RO system is (52.5+22) t/d.
  • the second-stage RO system produces 15t/d of concentrated water and enters the first-stage RO system.
  • the secondary RO system produces 59.5t/d of fresh water and enters the ultraviolet disinfection system for disinfection and reuse.
  • the low-temperature evaporation system has a processing capacity of 3t/d, of which 2.5t/d of condensed water enters the three-stage RO system, and 0.5t/d of hazardous waste is outsourced for disposal.
  • the sludge produced by the pretreatment system and biochemical system is dewatered by the sludge treatment system and disposed of as hazardous waste.
  • the COD of raw water is 2000mg/L
  • ammonia nitrogen is 30mg/L
  • the COD after oil separation by air flotation is 1400mg/L
  • ammonia nitrogen is 20mg/L
  • the COD is less than 100mg after treatment by A/O system and MBR system.
  • ammonia nitrogen is less than 10mg/L
  • the recovery rate of the primary RO system reaches 70%
  • the recovery rate of the secondary RO system reaches 80%.
  • the recycled water consumption reaches more than 98%, and various indicators such as COD, ammonia nitrogen, and oil content meet the reuse requirements.

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  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
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Abstract

一种利用气浮预处理+生化+双膜法处理并回用机加工废水的系统处理机加工生产废水的方法，该系统包括废水收集池、隔油池、气浮池、A/O生化池、MBR池、中间水池、超滤系统、反渗透系统、浓液处理系统、污泥处理系统；该方法包括：(1)通过废水收集池对废水进行收集并经隔油池处理后提升至气浮池；(2)在气浮池的反应区中分别投加碱、PAC和PAM，经气浮处理后的废水自流进入A/O生化池；(3)经A/O生化池处理后的出水进入MBR池，通过MBR池处理后的出水进入中间水池；(4)中间水池的水由高压泵提升至超滤系统，超滤出水进入RO系统，经三级RO系统处理后的清水经紫外消毒后回用。所述方法具有处理效果好，抗冲击负荷强，回用水回用率高，回用水质稳定等特点。

Description

一种利用气浮预处理+生化+双膜法处理并回用机加工废水的系统及方法 技术领域
本发明属于工业废水处理技术领域，特别是涉及一种利用气浮预处理+生化+双膜法处理并回用机加工废水的系统及方法。
背景技术
现阶段，我国机加工废水用量较大，处理效果不佳，能够达到回用的更是不多。国内机加工生产废水处理工艺以生物法为主，大部分的企业自建污水处理站，但处理效果不佳，能够稳定满足回用要求的更是不多。
目前机加工生产废水物理法处理技术主要包括气浮法、吸附法和混凝法，主要是去除油份、色度和COD等。气浮法选用溶气气浮，由空气压缩机送到空气罐中的空气通过射流装置被带入溶气罐，在0.35MPa压力下被强制溶解在水中，形成溶气水，送到气浮槽中。在突然释放的情况下，溶解在水中的空气析出，形成大量的微气泡群，同泵送过来的并经加药后正在絮凝的污水中的悬浮物充分接触，并在缓慢上升过程中吸附在絮集好的悬浮物中，使其密度下降而浮至水面，达到去除SS和COD及油份的目的。吸附法是应用具有较强吸附能力的吸附剂，使废水中的一种或者数种成分吸附于表面。在机加工生产废水处理中，吸附法主要用在预处理和深度处理，不同的吸附剂对废水吸附具有不同的选择性，但是通常吸附剂吸附效果好，费用较高，同时再生工序困难。混凝法是机加工废水经常采用的物化处理法之一。混凝法主要是通过絮凝剂将大分子有机物凝集成絮体后，在沉淀池中实现泥水分离。混凝法工艺简单、成本低、对不溶性的悬浮物处理效率高。但是对水溶性高的有机物去除效果差，污泥量较大且需要后续处理处置。生物法主要是通过微生物厌氧反应将大分子有机物氧化降解为小分子有机物，同时发酵反应使得有机C转化为甲烷，同时结合其他生化工艺，实现氨氮的去除。机加工废水处理难度很大，需要结合物理混凝法和化学氧化法提高可生化性，因此，生物法主要是起到提高可生化性，降低COD的作用。膜法主要是通过超滤膜、反渗透膜等膜的过滤可达到高效去除污染物以及深度脱盐的目的。
尤其是针对机加工废水中油份的去除和COD的去除，对后续膜的使用寿命及污染堵塞的时间会较大的影响，频繁的反洗膜及更换膜会给企业带来很大的人力费用、药剂费用和膜更换费用。因此，如何高效、低成本、稳定的做好机加工废水的除油、除COD及膜的稳定运行，如何保证膜系统稳定的产水量和水质是目前急需解决的技术问题。
发明内容
本发明的主要目的在于针对机加工废水中油份的去除，COD的去除，对后续膜的使用寿命及污染堵塞的时间会较大的影响，频繁的反洗膜及更换膜会给企业带来很大的人力费用、药剂费用和膜更换费用，提供一种利用隔油气浮预处理+A/O+MBR+超滤+反渗透处理并回用机加工废水的系统及方法，可以实现机加工生产废水的高效稳定处理及回用。
本发明的目的及解决其技术问题是采用以下技术方案来实现的。
依据本发明提出的一种利用气浮预处理+生化+双膜法处理并回用机加工废水的系统处理机加工生产废水的方法，其特征在于：所述利用气浮预处理+生化+双膜法处理并回用机加工废水的系统包括物废水收集池、隔油池、气浮池、A/O生化池、MBR池、中间水池、超滤系统、反渗透系统、浓液处理系统、污泥处理系统；所述A/O生化池包括依次连接的兼氧池和好氧池；所述方法包括以下步骤：
(1)通过废水收集池对车间生产废水进行收集并经隔油池进行隔油处理后由废水提升泵提升至气浮池；
(2)在气浮池的反应区中分别投加碱、PAC和PAM，经气浮处理后的废水自流进入A/O生化池，根据出水氨氮含量，控制硝化液回流比为200～300％，强化脱氮处理；
(3)经A/O生化池处理后的出水进入MBR池，通过MBR池好氧生化处理和MBR膜过滤后的出水由出水自吸泵负压抽至中间水池；
(4)中间水池的废水由高压泵提升至超滤系统，超滤出水进一级RO系统，一级RO系统的浓水进入三级RO系统，淡水进入二级RO系统，二级RO系统的浓水返回一级RO系统进行处理，三级RO的淡水进入二级RO系统，三级RO的浓度作为危废处理，二级RO系统处理后的淡水经紫外消毒后回用。
前述的方法，其特征在于：所述步骤(2)中所述气浮池反应区分为三格，由收集池废水提升泵提升进入第一格中，通过投加工业液碱控制pH值到8～9，第一格出水进入第二格，在第二格中投加絮凝剂PAC，第二格出水进水第三格，在第三格中投加阴离子高分子量PAM，强化混凝效果，反应后出水进入气浮区，通过气浮反应，上部去除悬浮物和油份，下部沉降颗粒物，中部清水进入A/O系统。
前述的方法，其特征在于：所述步骤(2)所述A/O处理系统中控制硝化液回流比在200～300％。
前述的方法，其特征在于：所述步骤(3)所述MBR池的污泥回流比控制在50～150％。
前述的方法，其特征在于：所述步骤(3)中所述MBR处理系统中MBR膜采用浸没式平板膜，膜通量为0.2～0.3m 3/m 2.d。
前述的方法，其特征在于：整个系统进水的COD不超过5000mg/L，盐分浓度不超过6000mg/L。
借由上述技术方案，本发明至少具有下列优点：
(1)本发明的机加工生产废水经过隔油池、气浮池预处理后能够有效后废水中的部分有机物、悬浮物及油份，尤其是油份和有机物，可以有效保证后续生化系统和膜处理系统的稳定运行。
(2)本发明的机加工废水经预处理进入A/O系统+MBR系统，能够有效去除废水中的有机物及氨氮等污染物，能够有效保证进入后续超滤和RO系统的水质，有效保证超滤膜和RO的使用寿命及清洗频率，能够有效降低企业的运营费用，降低超滤膜和RO膜的更换维护费用。
(3)本发明的机加工废水经隔油池、气浮池预处理、A/O系统、MBR系统处理后进入超滤和RO系统，通过超滤和三级RO系统能够有效保证废水回用水量和降低危废产生量。
综上所述，本发明特殊的利用气浮预处理+生化+双膜法处理并回用机加工废水的系 统处理机加工生产废水的方法，具有高效、低成本、稳定的处理机加工废水的除油除COD及膜的稳定运行，保证膜系统稳定的产水量及水质等特点。
其具有上述诸多的优点及实用价值，并在同类方法中未见有类似的设计公开发表或使用而确属创新，其不论在方法上或功能上皆有较大的改进，在技术上有较大的进步，并产生了好用及实用的效果，且较现有的方法具有增进的多项功效，从而更加适于实用，而具有产业的广泛利用价值，诚为一新颖、进步、实用的新设计。
上述说明仅是本发明技术方案的概述，为了能够更清楚了解本发明的技术手段，并可依照说明书的内容予以实施，以下以本发明的较佳实施例并配合附图详细说明如后。
附图说明
图1是本发明的方法处理流程图。
具体实施方式
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面将结合本发明实施例和附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
请参阅图1所示，本发明较佳实施例的一种利用气浮预处理+生化+双膜法处理并回用机加工废水的系统处理机加工生产废水的方法应用江苏省无锡市某外资机加工企业废水处理站。
该废水处理站主要包括废水收集池、隔油池、气浮池、缺氧池、好氧池、MBR池、中间水池、精密过滤器、超滤系统、一级RO系统、二级RO系统、三级RO系统、低温蒸发系统、紫外消毒系统、污泥处理系统等。
隔油池的处理量为60t/d，气浮池的处理量为60t/d，A/O系统由串联的A池和O池组成，停留时间分别为8h和16h，A池配有搅拌系统，O池配有微孔曝气器；MBR池停留时间为10h，配有曝气系统和浸没式MBR平板膜，MBR池硝化液回流通过两台 回流泵回流，一用一备；MBR池出水通过两台自吸泵负压抽吸，一用一备。超滤膜系统处理量为60t/d，通过超滤处理后的水进入一级RO系统，一级RO系统处理量为75t/d，产生浓水量为22.5t/d，产生淡水量为52.5t/d，一级RO系统产生的22.5t/d浓水进入三级RO系统，三级RO系统产生浓水3t/d，产生淡水22t/d，三级RO产生的3t/d浓水进入低温蒸发系统，三级RO产生的22t/d淡水进入二级RO系统，二级RO系统处理量为(52.5+22)t/d，二级RO系统产生浓水15t/d，进入一级RO系统处理，二级RO系统产生淡水59.5t/d进入紫外消毒系统进行消毒后回用。低温蒸发系统处理量为3t/d，其中2.5t/d冷凝水进入三级RO系统，0.5t/d的危废委外处置。预处理系统和生化系统产生的污泥由污泥处理系统脱水处理后作为危废委外处置。
上述处理系统中，原水的COD为2000mg/L，氨氮30mg/L，通过气浮隔油后的COD为1400mg/L，氨氮20mg/L，再经A/O系统和MBR系统处理后COD小于100mg/L，氨氮小于10mg/L，一级RO系统的回收率达到70％，二级RO系统的回收率达到80％。经超滤和RO系统处理后的回用水量达到98％以上，COD、氨氮、油份等各项指标满足回用要求。
以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明,任何熟悉本专业的技术人员，在不脱离本发明技术方案范围内，当可利用上述揭示的方法及技术内容作出些许的更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明技术方案的范围内。

Claims (6)

  1. 一种利用气浮预处理+生化+双膜法处理并回用机加工废水的系统处理机加工生产废水的方法，其特征在于：所述利用气浮预处理+生化+双膜法处理并回用机加工废水的系统包括物废水收集池、隔油池、气浮池、A/O生化池、MBR池、中间水池、超滤系统、反渗透系统、浓液处理系统、污泥处理系统；所述A/O生化池包括依次连接的兼氧池和好氧池；所述方法包括以下步骤：
    (1)通过废水收集池对车间生产废水进行收集并经隔油池进行隔油处理后由废水提升泵提升至气浮池；
    (2)在气浮池的反应区中分别投加碱、PAC和PAM，经气浮处理后的废水自流进入A/O生化池，根据出水氨氮含量，控制硝化液回流比为200～300％，强化脱氮处理；
    (3)经A/O生化池处理后的出水进入MBR池，通过MBR池生化处理和MBR膜过滤后的出水由出水自吸泵负压抽至中间水池；
    (4)中间水池的废水由高压泵提升至超滤系统，超滤出水进一级RO系统，一级RO系统的浓水进入三级RO系统，淡水进入二级RO系统，二级RO系统的浓水返回一级RO系统进行处理，三级RO的淡水进入二级RO系统，三级RO的浓水作为危废处理，二级RO系统处理后的淡水经紫外消毒后回用。
  2. 根据权利要求1所述的方法，其特征在于：所述步骤(2)中所述气浮池反应区分为三格，由收集池废水提升泵提升进入第一格中，通过投加工业液碱控制pH值到8～9，第一格出水进入第二格，在第二格中投加絮凝剂PAC，第二格出水进水第三格，在第三格中投加阴离子高分子量PAM，强化混凝效果，反应后出水进入气浮区，通过气浮反应，上部去除悬浮物和油份，下部沉降颗粒物，中部清水进入A/O系统。
  3. 根据权利要求1所述的方法，其特征在于：所述步骤(2)所述A/O处理系统中控制硝化液回流比在200～300％。
  4. 根据权利要求1所述的方法，其特征在于：所述步骤(3)所述MBR池的污泥回流比控制在50～150％。
  5. 根据权利要求1所述的方法，其特征在于：所述步骤(3)中所述MBR处理系统中MBR膜采用浸没式平板膜，膜通量为0.2～0.3m 3/m 2.d。
  6. 根据权利要求1所述的方法，其特征在于：整个系统进水的COD不超过5000mg/L，盐分浓度不超过6000mg/L。
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