I – Urban Sewage Treatment Solutions
1.Traditional Biological Sludge Process
Technical Process: inflow→grating→grit basin→primary sedimentation basin→aeration basin→secondary sedimentation basin→（disinfection）→water outlet
II – Anaerobic Biological Treatment——UASB
Technical Process: inflow→grating→grit basin→Upflow Anaerobic Sludge Blanket（UASB）→ oxidation pond →water outlet.
This process requires few machinery and equipment, little cost, no need to set any sludge treatment device since excess sludge is discharged into oxidation pond for stabilizing treatment. However the bigger oxidation pond requested is a disadvantage for this process.
III – A/O Process (Anoxic-Oxic)
Technical Process: inflow→grating→grit basin→primary sedimentation basin→anoxic pond→aeration basin→secondary sedimentation basin→water outlet.
[/vc_column_text][vc_column_text]1- In the anoxic pond, the denitrifying bacteria in the backflow sludge use the organic matter from the inflow as the carbon source to reduce a large amount of nitrate nitrogen (NOx-N) in the backflow mixture to N2, so as to achieve the purpose of denitrifying;
2- Such biochemical reaction as bio-oxidation of organic compounds, ammoniation of organic nitrogen and nitrification of ammonia nitrogen proceed in aerobic pond;
3- Sedimentation basin after section O, part of the precipitated sludge is returned to section A to provide sufficient microorganisms. At the same time, the mixing liquid in section O is returned to section A to ensure that there is enough nitrate in section A.
The process is a series connection of anoxic and aerobic ponds, also known as predenitrifying biological denitrification system.
IV – A2/O Process（Anaerobic -Anoxic-Oxic）
Technical Process: inflow→grating→grit basin→primary sedimentation basin→anaerobic pond→anoxic pond → aeration basin→secondary edimentation basin→water outlet.
1-Anaerobic stage: The phosphorus-accumulating bacteria in returned sludge releases phosphorus and absorbs the biodegradable organic matters such as the lower fatty acids, while some of them are ammoniated;
2-Anoxic stage: Denitrifying bacteria transforms NO3–N and NO2—N which is from internal reflux mixing liquid into N2 by denitrification so as to achieve the purpose of denitrification, and keep Biochemical Oxygen Demand (BOD) going down;
3-Oxic stage: Organic matter is further oxidized and decomposed, ammonia nitrogen is transformed into NO3 — N by nitrobacterium, and the phosphorus-accumulating bacteria which is fully releasing phosphorus in anaerobic pond is transformed into high phosphorus sludge after excessively absorbing phosphorus from oxic pond, then the purpose of phosphorus removal can be achieved by excess sludge discharge
V – A/B Technology（Adsorption Biodegradation）
Technical Process: inflow→grating→grit basin→aeration basin section A→Intermediate sedimentation basin（sludge return to aeration basin section A）→aeration basin section B→secondary sedimentation basin（sludge return to aeration basin section B）→outflow
Section A（high load） and Section B（low load）should be strictly separated and installed inseries. This process can be regarded as an improved two-stage biological treatment technology
1-Section A, high load period, the duration of stay is 20 ~ 40 min, its main function is biological flocculation and adsorption with incomplete oxidation reaction at the same time, organisms are mainly existed in the form of short – generation bacterial communities and BOD can be removed more than 50%;
2-Section B, similar to the conventional activated sludge method, with lower load and longer sludge age;
3-Section A has high efficiency and strong buffer capacity. Section B acts as a water gate and has good treatment stability;
4-Disadvantage: the production of sludge by A/B method is large, and the organic matter content of sludge in section A is very high, the investment and cost of the subsequent stable treatment of sludge will increase. In addition, the removal of more BOD in section A may result in insufficient carbon source so it would be difficult to complete the nitrogen removal process.
Adsorption-biodegradation technology has good practicability for high concentration sewage treatment.
VI. MBR Technology
Technical Process: it is a new high efficiency sewage treatment technology which combines high efficiency membrane separation technology with traditional activated sludge process. MBR flat membrane module is placed in an aeration basin, and the water after aerobic aeration and biological treatment is filtered out by the pump through the filter membrane, and the activated sludge and macromolecular organic matters would be intercepted, even the secondary sedimentation basin process also be saved.
Membrane bioreactor, activated sludge concentration improved greatly, hydraulic retention time (HRT) and sludge retention time (SRT) can be controlled separately, refractory materials continuously react and degrade in the reactor. Membrane bioreactor, activated sludge concentration improved greatly, hydraulic retention time (HRT) and sludge retention time (SRT) can be controlled separately, refractory materials continuously react and degrade in the reactor.
1. Wastewater from buffing and polishing (major pollutant: COD, BOD, SS)
Technical process: wastewater — adjusting tank — coagulation reaction tank — sedimentation pool — hydrolysis acidification pool — aerobic pool — secondary sedimentation pool — filtration — discharge.
2. Wastewater from degreasing
(major pollutant: pH、SS、COD、BOD、petroleum、chromaticity)
Technical process：wastewater→oil separator→adjusting tank→air flotation equipment→anaerobic or hydrolytic acidification→aerobic biochemical treatment→sediment→filtration or adsorption→discharge
3. Acid pickling and phosphating wastewater
1）Acid pickling wastewater (pH is 2~3，high concentration Fe2+ and SS) Technical process：wastewater→adjusting tank→neutralization pond→aeration and oxidation pond→coagulation reaction tank→sedimentation basin →filtering basin→pH callback pool→discharge.
2）Phosphating wastewater (major pollutant: pH, SS, PO43-, COD, Zn2+) Technical process：wastewater→adjusting tank→first level coagulation reaction tank→sedimentation basin→second level coagulation reaction tank→ secondary sedimentation basin→filtering basin→discharge
1. Cyanide wastewater (major pollutant: CN-)
Technical process： cyanide wastewater→adjusting tank→first level cyanide breaking basin→second level cyanide breaking basin→compositive electroplate wastewater pool.
2. Chromate wastewater (major pollutant: hexavalent chromium).
Technical process： chromate waste water→adjusting tank→Chromium reduction pool→coagu-flocculation reaction→sedimentation basin→pH callback pool→discharge
3. Compositive heavy metal wastewater (major pollutant: non-chromium compound heavy mental ions as Cu、Ni、Zn, etc.)
Technical process：compositive heavy metal wastewater→adjusting tank→fast mixing pool→slow mixing pool→inclined tube sedimentation pool→filtration →pH callback pool→discharge.
4. Comprehensive treatment of various electroplating waste water (cyanide waste water, hexavalent chromium waste water, acid and alkali, heavy metal Cu, Ni, etc.)
Textile, printing and dyeing wastewater has great volume, there is large amount of alkali, and high value of PH, as well as large amount of residual dyes and auxiliaries, high chromaticity and high content of organic substances , high oxygen consumption, much suspended solids, and trace toxic substances.The composition of wastewater from pesticide production is complex, toxic, harmful and discharge-unstable, with high content of organic phosphorus, poor biodegradability and low efficiency of biochemical treatment. The physicochemical – biochemical treatment process should be adopted to make the treated water meet the discharge requirement.
Technical process:
The composition of pesticide wastewater varies greatly, and the concentration of waste gas and organic matter discharged during production process is high, so the direct biochemical treatment is difficult and costly. Chemical method should be taken according to the characteristics of water quality <extraction, distillation, adsorption>, separation of raw materials and products can be reused in production, wastewater mixes to adjust pH value, joined the rinse water, sanitary sewage and sludge dewatering water so as to, improve biological availability, then enter the SBR reaction pool. Biopharmaceutical industry is the heavy polluter in pharmaceutical industry, there is high concentration of organic pollutants in wastewater discharge and contains all factors inhibiting microorganism growth, using the general wastewater treatment process is difficult to achieve good treatment effect
Technical process: as follows (If deep treatment is carried out, activated carbon biofilter tank can be added)
Wastewater from beer production mainly comes from malt workshop. There is wheat leaching wastewater, saccharification, filtration and washing wastewater in the saccharification section, fermentation wastewater and washing wastewater in the fermentation section, bottle washing water in the filling workshop and so on. It contains high concentration of organic matter, and the main pollutant is in the saccharification and fermentation wastewater, which has a large amount of water and a high content of organic matter.
Technical process: as follows (The waste fermentation liquor contains a lot of distillers’ grains, which can be recycled into protein feed and obtain high economic benefits. At the same time, the organic load of wastewater treatment is reduced. the wastewater biodegradability of beer production is good, but the characteristics of the beer production has strong cyclicality and regularity, so production wastewater also corresponds to it, the fluctuation of water quality and quatity is large, instantaneity is strong, advanced, reasonable, mature and reliable SBR process can be considered aiming at above features)
Characteristics of leather wastewater: complex composition, deep color, much suspended matter, high oxygen consumption, and much water quantity.
Suspended matter: much lime, broken leather, wool, oil residue, meat residue and so on.
CODcr: the processing materials are mostly auxiliary, lime, sodium sulfide, ammonium salt, vegetable tanning agent, acid, alkali, protease, chrome tanning agent, neutralizer, etc. so the content of COD is high.
BOD5：soluble protein, oil, blood and other organic matter
Sulphur: it is mainly the sulfide produced by the use of sodium sulfide in the process of ash leaching.
Chrome: chromic acid effluent from chrome tannage
Technical process: Two processing techniques are recommended
Zero emission solution for desulfurization wastewater from power plants
- High salt content, large fluctuations.
- High concentration of suspended solids.
- High hardness and easy to scale.
- It Contains heavy metal ions.
Solutions
Enterprises, industrial parks, community, or neighborhood, staff activity or production of sewage water quality general with COD, BOD and ammonia nitrogen is a bit high, but good biochemical, because can cover an area of an area small, high water quality requirements, so the water quality to process requirement, high degree of centralization, modular construction, and can be done through by increasing the equipment for incremental water quality requirements
1 – In modular construction, equipment investment can be increased according to the construction cycle, and one-time equipment and infrastructure investment can be reduced by 50% compared with traditional technology.
2 – Less residual sludge, reduced by 60%; Reduce the cost of subsequent sludge treatment equipment. 3 – The effluent water quality is stable, it can achieve better reuse of water quality standards and meet different demand for reuse.
4 – The construction period is short, reducing the investment in traditional craft civil construction and saving the secondary sinking pool.
5 – Automatic control to reduce the difficulty of personnel operation
6 – Free adding process to meet different requirements.
7 – Removing the anoxic ponds, greatly improves the denitrification effect on slightly higher ammonia nitrogen sewage. Constructed wetlands are grounds similar to wetlands that are constructed and controlled by manpower.
The sewage and sludge are controlled to be allocated to the artificially constructed wetland. In the course of the flow of sewage and sludge in a certain direction, the physical, chemical and biological activities of soil, artificial medium, plants and microorganisms are mainly used in the three coordination of physical, chemical and biological activities.
A technology for treating sewage and sludge. Its mechanism of action includes adsorption, retention, filtration, oxidation and reduction, precipitation, microbial decomposition, transformation, plant shelter, residue accumulation, transpiration water and nutrient absorption, and the effects of various animals. On the premise of promoting the benign circulation of pollutants in the wastewater, the production potential of the resources will be fully exploited to prevent the re pollution of the environment, and the best benefit of sewage treatment and resource utilization is obtained.
Advantages of artificial wetland:
1. Cost of construction and operation is cheaper, down more than 40%.
2. Landscaping, double purification.
3. Simple operation management; no equipment maintenance costs.
4. It can be used as a small water garden for tourists to relax. It is in line with the circular economy model, and in the most economical way, we can realize the goals of sludge, waste reduction, stabilization, harmlessness and resource utilization in a real sense.
Service mode:
1. Engineering construction, trusteeship operation, commission processing
2. Lease and purchase of equipment modules
3. After-sales service, technical service
4. BOT、BOO、BT、BTO etc
5. Government and social capital cooperation (PPP) model
Able to provide customer service including general contracting and operation management services after completion.
