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Huanchuang (Xiamen) Technology Co.,Ltd
Phone: ：+86 592 5029670
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| Example application of chemical wastewater treatment engineering pipeline crusher |
| Edited：HuanChuang technology Date：2013-1-4 15:41:49 |
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1 Overview
Liquid waste recycling, and many other issues to be reasonable and effective design of chemical wastewater treatment works. Chemical wastewater treatment engineering technical difficulty than the municipal wastewater treatment plant is much larger. Also, the complex chemical wastewater categories, specifically designed to standardize the small units engaged in design both various design institutes, research institutes, there are many environmental companies, the levels vary considerably. Coupled with the management of the industry causes of the existing engineering levels vary considerably. Quite a few of the many engineering problems, a profound lesson. The design phase exist, as well as the construction of pipelines crusher will run the commissioning phase assault manifested, resulting in many engineering difficult to smooth acceptance handover. Wastewater treatment whether standards, design is the key, and now a Chemical Group integrated waste management engineering design are discussed.
2 Engineering Design
2.1 overall design principle
Chemical plant wastewater drawing workshop wastewater composite workshop wastewater, synthesis workshop wastewater, paint shop wastewater, sewage. According to the water quality characteristics of the wastewater of the group can be divided into three categories:
(1) The first category of waste water including polyester wastewater binder rinse water, wetting agents, curing agent and accelerator production wastewater, high concentrations of COD wastewater COD mass concentration of 2300 ~ 86400mg / L of water 100t / d.
(2) The second type of wastewater is in addition to sewage wastewater, including the workshop rinse water, wastewater medium concentration of COD mass concentration of COD 790 ~ 960mg / L; large amount of water for the 1900t / d, representing total volume of wastewater, 73%; pH value of 4.0 to 8.0;
(3) The third category is the sewage water of 600t / d, pH value of 6 to 9, the COD concentration is low, easy to biochemical treatment.
????Differences in the nature of the wastewater in each sector of the chemical plant is difficult to bring integrated treatment. Wastewater all mixed processing, will greatly increase the cost of processing and infrastructure investment. Especially the first class wastewater, COD concentration after pretreatment with other wastewater mixed treatment. Organic wastewater processing, depending on the organic content in wastewater, select a different process. Wastewater treatment process selection related to the investment in the construction of wastewater treatment works, the level of operating costs, sewage station effluent quality, convenient and reliable operation management and many other aspects. The spirit of the principle of treatment compliance, ease of management, reduce costs, and avoid secondary pollution, according to the water quality and wastewater discharge workshop distance, wastewater divided into two categories, respectively, after pretreatment with mixed sewage treatment.
2.2 process selection
2.2.1 The high concentration organic wastewater pretreatment program
At home and abroad for treatment of high concentration organic wastewater pipeline crusher anaerobic biological method, wet oxidation and high temperature incineration three categories. After comprehensive comparison of the technical and economic aspects, anaerobic biological method as a high concentration organic wastewater pretreatment program.
2.2.2 The concentration of organic wastewater pretreatment program
Concentration organic wastewater was creamy, low transparency, milky white appearance. The wastewater was emulsified to subsequent treatment more difficult, and therefore the need for the second type of wastewater for breaking pretreatment. The most commonly used method of demulsification chemical method demulsification, ie emulsified wastewater dosing coagulant colloidal adsorption of oil droplets and alum, and other physical and chemical effects produced by flocculation or cohesion by pharmaceutical and surface charge it, and then polymer substance as an additive to play a bridging role of flocculation. Then the oil was removed by exclusion oily sludge method. This method produced flocs, and Pharmacy with less, producing less sludge settling properties.
2.2.3 wastewater treatment program
This process uses hydrolysis acidification - two composite contact oxidation as a comprehensive wastewater treatment process. Hydrolysis acidification process has the following advantages: ① The significantly remove suspended solids or organic matter in the wastewater effectively reduce subsequent aerobic treatment process sludge, thereby reducing device volume. According to reports, the total volume of the hydrolysis acidification - aerobic process less than a single aerobic process half [3]; ② sludge production is far below the aerobic process (aerobic process only 1/10 to 1/6) [ 4], the sludge has a high degree of mineralization are easy to handle; ③ effectively improve the biodegradability of the wastewater, buffer influent loading changes, so as to create a stable subsequent aerobic treatment, good flow conditions; ④ operating costs low, The removal of organic matter in the water can greatly save the oxygen demand of the aerobic stage, thus saving the running cost of the overall process.
After pretreatment hydrolysis acidification processing pipeline crusher has to go in addition to most of the COD of the wastewater, but still can not reach into the municipal drainage pipe emissions requirements, so need to get into the aerobic reactor pool, further removal of organic pollutants, until to meet emission requirements. This design uses two pieces of composite contact oxidation method as aerobic treatment process. The two-stage hybrid contact oxidation method compared with conventional activated sludge biological filter method, has the following significant advantages: ① processing efficiency, strong resistance to shock loading, running good stability; ② producing less sludge less prone to sludge bulking; ③ reactor the high concentration of microorganisms, long SRT, has a strong ability to decompose biodegradable organics; ④ hydraulic retention time is short, in the case of processing the same amount of water, a small volume of the reactor, representing small area of; ⑤ project investment less equipment is simple and easy to operate, low running costs and low overall energy consumption.
2.3 Process to determine
Buildings design parameters of the 3 main structure (building)
(1) The regulation pool 1. Reinforced concrete structure, a size of 3.5m × 3.5m × 4.5m, HRT = 12h.
(2) adjusting pool. Reinforced concrete structure, a size 10.0m × 10.0m × 5.0m, HRT = 10h.
(3) the primary settling tank. The reinforced concrete structure, a size of 6.5m × 6.5m × 4.5m, surface load 1.86m3 (m3.h-).
???(4) the anaerobic reactor. The reinforced concrete structure, the semi-underground, l Block size 12.0m × 12.0m × 8.5m, the effective depth of 8m, the residence time of 4d.
(5) the pool acid hydrolysis. Reinforced concrete structure, semi-underground, one size l5.0m × 10.0m × 4.5m, HRT = 7h, sludge concentration of 4 to 6 g / L,.
(6) two composite contact oxidation pond. The size of 40.0m × 15.0m × 4.5m, located four long corridor along the pool. A contact oxidation HRT = 16h. Two the contact oxidation HRT = 10h.
(7) secondary sedimentation tank. Reinforced concrete structure, semi-underground, a size of 10.0m × 10.0m × 4.5m the surface load 1.08m3 / (m2.h).
???(8) The sludge thickener. Reinforced concrete structure, semi-underground, one size l0.0m × 2.5m × 4.5m, the solids loading 30kg / (m2? D) the mass concentration 8kg/m3 of sludge solids.
The 4 wastewater debug running results
Found that the water quality of the pretreatment plant, water changes than the design of the main process of the program, taking into account the biochemical processing, sensitive to changes in the quality and quantity of wastewater taken synchronization combined with step-by-step debugging debugging debugging process method, that is, first commissioning pretreatment unit, re-commissioning of integrated biological wastewater treatment unit: physico-chemical pretreatment unit and anaerobic pretreatment unit to take the synchronized debugging. As the anaerobic treatment of high water stability requirements, the debug cycle is longer. Therefore decided a key link in the debug cycle and debugging effect. In order to reduce the anaerobic reactor debugging cycle, purchased granular sludge the inoculated sludge within the anaerobic reactor, in addition, dosing pretreatment also take workshops debugging way to reduce the toxicity and concentration of the high concentration wastewater . Pretreatment debugging success. Pipe crusher debugging biochemical pretreatment unit and biological wastewater treatment. Seed sludge from the sewage treatment plant, the Group old factory sludge bacteria the factory wastewater has certain adaptability, so debugging cycle is much shorter.
Debugging a period of about eight weeks, after put into trial operation. Stable at 80% during the daily operation of the anaerobic reactor COD removal efficiency. Pool acid hydrolysis of COD removal efficiency of 20% or more, but more than 80% of SS removal; multi-level barrier function of the two contact oxidation COD, and ensure that the process has a high resistance to impact load.
5 Conclusion
Anaerobic biological wastewater pretreatment of high concentration. Mixed with other wastewater to the wastewater treatment process as the core in order to the hydrolysis acidification levels hybrid contact oxidation. Chemical Group's industrial wastewater discharge standards can be achieved, and reduce processing costs. |
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