Industrial wastewater treatment of domestic sewage of urban sewage in the sewage treatment plant is building a better vision of the ideal city, but due to a variety of economic, geographic, environmental, cultural and other reasons, each of the city's sewage treatment plant has more or less problems. Allows a city and the construction of a the normal good functioning of the sewage treatment plant is a key step of the construction of the modern society, each city. To a variety of activities from the production life, human beings can not do without the use of water resources, water recycling system to recycle depending on the degree of pollution and decided to recall. For example, many industrial sewage to flow directly into the case not undergo a rigorous process of convergence of the rivers and groundwater water resources that will be the production of human life are not severely affected. And sewage unlike industrial sewage is so contain many toxic and hazardous substances, but some of the common water-insoluble the hodgepodge solid always inevitable, after crushing grille solve these modern ability of a new sewage treatment plant become a sign of the high-tech modern sewage treatment plant. The use of crushed grille well able to achieve this effect.
Sewage treatment plant in the upgrade process, first we have to identify a crushing-type grille standard, in the end is an A or a B in the middle of this standard, in addition to have a good understanding of digital calculation outside it to adapt to conditions should also study, for example, an A, a B has an applicability conditions. I personally think that, the pollutant abatement should be analyzed from the point of view of the environment as a whole. From a B to an A to increase the number of treatment facilities to achieve some effect, it is not the city, this basin immediately do things. Example, we suspended solids SS from a B to an A, do not underestimate this, the general wastewater treatment plant to a B standard is still possible, that is to say, we control is possible in SS20 mg liter to 10 mg liter sure to add filtering facilities. Phosphorus.
The entire sewage treatment plant standards should consider the characteristics of the geographical and waters, crushed grille reasonable sewage crushing-type grille treatment standards. Proposed a very high standard, some key river basins, focusing on areas such as Taihu, crushed grill must meet this standard. Since the country has developed this standard, we should strictly enforce the standard crushed grille.
Upgrading works
We talk about upgrading the comminuted grille from the conventional activated sludge secondary standard to a B or an A, we must first take into account the nitrogen and phosphorus removal, adjustment of the activated sludge process, increase anaerobic missing oxygen process, improve the removal efficiency of nitrogen and phosphorus. Second biofilm process. Crushed grille mentioned upgrading everyone think it is a bioreactor, in fact, there are many methods, such as hydro renovation and equipment modification. Transformation of the role of the hydro improve uneven flow distribution, short flow, backwater area, density, flow, jet and sludge drain. The sedimentation tanks transformation is a lot of potential to be tapped. Out from the water how uniform allocation, there is a reverse flow tube next to the influent, the reasonable distribution of traffic, a few pieces of the bezel, not every pond must add these baffles in the water area, we design little.
Sludge treatment as well, plus a few pieces of sludge at the bottom of the bezel, making sludge rising. From the water flow states consider a few pieces of the baffle is to play the role of the sedimentation tanks. The view from the surface of the water flow pattern, theoretically, actually really play each volume, each area there is a great potential to be tapped, so these potential upgrading very important.
Recently, we have a test in a sewage treatment plant, many foreign companies baffle design computer models, we are doing experimental research in Shanghai, plus a few pieces of the bezel. Crushed grille plus a baffle on the bottom of the sink side or slant in the water, the improvement of the entire processing is very effective.
In addition, the device updates soon, the whole environment of the wastewater treatment plant is also poor, inefficient over the years, so you want to transform some of the equipment. Which increase online monitoring and control equipment, improve the operation of the sewage treatment, the use of advanced control, effective control of the dissolved oxygen level, reducing the amount of oxygen and reduce energy consumption.
Upgrading works program
Upgrading works program, I chose three unique examples.
For example, the first dual Shanghai Quyang sewage treatment plant sludge treatment system. Crushed grid due to the state of the nitrogen and phosphorus removal activated sludge, including sludge age, different conditions of oxygen in a pool inside A2O process sludge load, sludge SRT must select a appropriate value. The right is not necessarily efficient, crushed grille dual sludge system is of these two systems separately select efficient short SRT to achieve phosphorus removal. This plant in the case of the original activated sludge, crushed grille does not increase the origin, while also reducing a primary settling tank, increasing the land area, plus some equipment modification, deodorant and other measures. Effluent standards reached after transformation of a B, and the impact on the surrounding environment is also reduced to a minimum, should run relatively stable.
The second is Shanghai Sitang sewage treatment plant. Crushed grille encounter a lot of problems, we in transformation run the process in temporary facilities and without water. Transformation certainly impact on the existing operation, environmental protection departments should not be stopped, and how to reduce the impact to the minimum limits proposed another transformation. This factory original bioreactor, we added a bioreactor, the original unchanged, new anoxic - aerobic process. The transformation was complete after the formation of the two forms, half of phosphorus removal, half mainly to denitrification. The entire standard must register can only achieve the two standards, because the leaders in Shanghai objective to impossible transformation, so allow improved, but more than the effect of the existing sewage treatment plant.
The third is the western suburbs of the sewage treatment plant in Tangshan. To reach back to the water, or an A typical back plus the things example, to increase the biological aerated filter denitrification and phosphorus removal increased chemical phosphorus removal, and then filtered through fiber filter to achieve the removal of SS.
The steps of the upgrading works
First, to carry out a comprehensive analysis of the sewage treatment plant, including operating parameters to collect, process hydraulic calculation, facilities and equipment evaluation to determine the transformation of content;
Second, the preparation of the sewage treatment plant rehabilitation programs, and technical and economic comparison, determine the recommended program; preparation of the sewage treatment plant embodiments, step by step how to implement a very important part of a sewage treatment plant can successfully transform To minimize the impact of proposed engineered packet segmentation implementation of the transformation program, will be running the sewage treatment plant.
Finally, talk about a few personal thoughts, is necessary to fully study to determine a reasonable level of standard, best put into effective than; Second, we must strengthen the construction and management of the collection system, to improve sewage effective collection rate comminuted grille to improve effective reduction rate of the wastewater treatment plant pollutant; Third, on the basis of a comprehensive analysis of the reasonable transformation program and the implementation of the program, taking into account the normal operation of the sewage treatment plant.
Upgrading of China's sewage treatment plant, the market space is probably how much, how many sewage treatment plants need to transform the way the cost of sewage treatment, contact your nearest reconstruction project after transformation how? Sources of funds as well as investment?
Zhang Chen: sewage treatment plant upgrade market space is still very large, because we are now the entire construction of the sewage treatment plant is still seriously lagging behind. The purpose of upgrading the sewage treatment plant, the major river valleys, major city sewage treatment plant upgrade in ongoing, other small and medium-sized sewage treatment plant there next upgrade problem, which is the current situation. I believe that gradually increase our understanding of the aquatic environment, the standard further strict upgraded in the future will gradually deepening will be mentioned in the higher altitudes. Artificial processing of municipal sewage treatment plant should solve some of nature can not solve some pollutants, these pollutants will always be in our ecosystem middle loop, to a certain degree of influence on human health will. Upgrading works, there are 40 million upgrade investment in upgrading, close to 800 dollars a square routine is about 1,000 dollars per ton of water treatment, of course, its investment in addition to the sewage treatment plant the outside, deodorant, equipment modification upgrading synchronization to keep up. The running costs of upgrading there will be increased through the use of efficient equipment, running costs would not add much. How to choose a reasonable standard, the program, taking into account the investment and operating costs, some of our research workers or design workers should be studied extensively.
Many sewage treatment plants are now faced with the problem of insufficient carbon source. To transform into a B or an A comminuted grille and some will be serious lack of carbon source for these carbon sources insufficient sewage treatment plant, we should not only consider the denitrification crushed grille also consider phosphorus removal as you consider external carbon source as full biological nutrient removal, or consider assisted chemical phosphorus removal?
Chang Chen: This is a good question. A sewage treatment plant in Shenzhen recently a rational and efficient allocation of carbon source reflux, multi-mode technology, reasonable allocation of the layout of the channels on our limited carbon source can be integrated utilization. From the view of the present state of research, I personally think that through the rational allocation of carbon source and stability of the COD was able to achieve. Shanghai are also exploring the total nitrogen can reach 10 mg l recently crushed grille through the effective allocation of our own sewage treatment plant is more difficult to reach 10 mg l. No more than two ways, one full advantage of their way to say how our sludge, sludge supernatant further processing to complement the effective carbon source. Another is the external carbon source. For both techniques, if it reaches 10 mg l, through the sludge itself some of the processing supplementary carbon source may also be achieved. Crushed grille total nitrogen but also to improve, to 8, to 5, definitely to external carbon source external carbon source, I think the Chinese will certainly do, but does not do at this stage, because we Chinese Midwest underdeveloped areas are still many sewage treatment plant or to the first sewage collected a large amount of pollutant reduction, making some of the main indicators of compliance to a certain extent, plus some organic pollutants, some of the carbon source. |
