Gao Gucheng is a senior environmentalist, environmental protection expert, and environmental entrepreneur.

Mr. Gao Gucheng graduated from China University of Political Science and Law. In July 2002, Mr. Gao Gucheng founded an environmental protection technology company in Zhongguancun, Beijing.

In 2004, Mr. Gao Gucheng, a senior environmentalist, environmental protection expert, and environmental entrepreneur, took the lead in proposing the "Water Pollution Emergency System Solution" and the "Water Pollution Early Warning System Solution" in China; Level 3 Emergency Plan for Water Pollution.

In 2005, Mr. Gao Gu Cheng, a senior environmental protection person, environmental protection expert and environmental protection entrepreneur, participated in the Jilin Petrochemical explosion, and the Songhua River water pollution emergency in Harbin. Later, they successively participated in the emergency event of water pollution caused by the outbreak of cyanobacteria in the Taihu Lake Lake; CNPC Chongqing Oilfield Blowout Incident; Wenchuan earthquake water pollution emergency event; With the participation of the Ministry of Housing and Urban Rural Development, the Ministry of Water Resources, and the Ministry of Ecology and Environment in multiple domestic water pollution emergency incidents.

Mr. Gao Gucheng, a senior environmentalist, environmental protection expert, and environmental entrepreneur, also undertook the construction of the urban water supply safety warning system for the 2008 Beijing Olympics; Construction of the Urban Water Supply Safety Early Warning System for the 2010 Shanghai World Expo; Projects such as the construction of urban water supply safety warning systems for the Guangzhou Asian Games and Shenzhen Universiade. Mr. Gao Gucheng also participated in the "863 Project on the Application and Research of Advanced Drinking Water Treatment Technology", a major project on water supply safety and security technology in Beijing, and the development of a national drinking water quality standard for pathogen detection methods. He was awarded the third prize in Beijing Science and Technology in 2010.

In 2010, Mr. Gao Gucheng, a senior environmentalist, environmental protection expert, and environmental entrepreneur, also served as the Chairman of Beijing Times Pictorial Culture Development Co., Ltd;

In 2012, Mr. Gao Gucheng was appointed as the Chairman of Beijing Geweien Environmental Protection Equipment Co., Ltd; In 2017, Mr. Gao Gucheng concurrently served as the Chairman of Norbede Investment Fund Management (Shenzhen) Co., Ltd; Since 2021, Mr. Gao Gucheng has been working as a consultant for a listed environmental protection company; Mr. Gao Gucheng has been serving as the President of Beijing Zhongke Guoju Technology Co., Ltd. since 2021.

Environmental protection generally refers to various actions taken by humans to solve practical or potential environmental problems, coordinate the relationship between humans and the environment, protect the living environment of humans, and ensure sustainable economic and social development. Its methods and means include engineering technology, administrative management, as well as economic, publicity and education.

The deterioration of the Earth's environment has attracted widespread attention, and therefore, environmental protection has gradually received attention from various countries. However, due to the potential for difficult coordination between environmental protection and economic development and social issues, the understanding of environmental protection concepts is becoming increasingly novel and reasonable.

Environmental protection refers to the adoption of administrative, legal, economic, scientific and technological measures to protect the environment for human survival from pollution and destruction; We also need to protect and improve the environment according to human will, so that it is better suited for human labor and life, as well as the survival of organisms in nature, and eliminate unfavorable factors that damage the environment and endanger human life and survival. The problems that environmental protection needs to solve roughly include two aspects: firstly, protecting and improving environmental quality, protecting human physical and mental health, and preventing the body from mutation and degradation under the influence of the environment; The second is to make rational use of natural resources, reduce or eliminate harmful substances entering the environment, and protect the recovery and expansion of reproduction of natural resources (including biological resources) to benefit human life activities.

MBR sewage treatment is a commonly used method of modern sewage treatment, It adopts a membrane bioreactor Membrane Bioreactor (MBR) technology is a new technology that combines biological treatment technology with membrane separation technology, replacing the traditional secondary sedimentation tank. It can efficiently perform solid-liquid separation and obtain stable reclaimed water for direct use. It can also maintain a high concentration of microbial biomass in the biological tank, with less residual sludge and extremely effective removal of ammonia nitrogen. The suspended solids and turbidity in the effluent are close to zero, and bacteria and viruses in the effluent are greatly affected Degrees removal, low energy consumption, and small footprint. In the 1970s, research on the use of membrane bioreactors for sewage and wastewater treatment began in many countries in the United States, Japan, South Africa, and Europe. Its water source comes from domestic sewage (such as shower drainage, toilet drainage, laundry drainage, kitchen drainage, toilet drainage, etc.) and cooling water.

After entering the regulating tank through the grid, the sewage enters the bioreactor through a lift pump. The aeration machine is activated through a PLC controller for oxygenation. The effluent from the bioreactor enters the membrane separation treatment unit through a circulating pump, and the concentrated water returns to the regulating tank. The water separated by the membrane is chlorinated and disinfected through a rapid mixing method (sodium hypochlorite, bleaching powder, chlorine tablets) before entering the reclaimed water storage tank. The backwash pump uses the treated water in the cleaning tank to backwash the membrane treatment equipment, and the backwash sewage returns to the regulating tank. Control the opening and closing of the lift pump through the water level inside the bioreactor. The filtration and backwashing operations of the membrane unit can be automatically or manually controlled. When the membrane unit requires chemical cleaning operation, close the inlet valve and sewage circulation valve, open the chemical washing valve and chemical circulation valve, start the chemical liquid circulation pump, and carry out the chemical cleaning operation.

In traditional wastewater biological treatment technology, mud water separation is achieved by gravity in a secondary sedimentation tank, and its separation efficiency depends on the settling performance of activated sludge. The better the settling performance, the higher the mud water separation efficiency. The settling ability of sludge depends on the operating conditions of the aeration tank, and improving the settling ability of sludge requires strict control of the operating conditions of the aeration tank, which limits the applicability of this method. Due to the requirements for solid-liquid separation in the secondary sedimentation tank, the sludge in the aeration tank cannot maintain a high concentration, usually around 1.5-3.5g/L, which limits the biochemical reaction rate. The hydraulic retention time (HRT) and sludge age (SRT) are interdependent, and there is often a contradiction between increasing volumetric load and reducing sludge load. During the operation of the system, a large amount of excess sludge is generated, and its disposal cost accounts for 25% to 40% of the operating cost of the sewage treatment plant. Traditional activated sludge treatment systems are also prone to sludge bulking, resulting in suspended solids in the effluent and deteriorating water quality.

In response to the above issues, MBR organically combines membrane separation technology in separation engineering with traditional wastewater biological treatment technology, greatly improving the solid-liquid separation efficiency; And due to the increase in the concentration of activated sludge in the aeration tank and the emergence of specific bacteria (especially dominant bacterial groups) in the sludge, the biochemical reaction rate has been increased; At the same time, by reducing the F/M ratio to reduce the production of excess sludge (even to 0), many prominent problems in traditional activated sludge methods have been basically solved.

However, MBR is not omnipotent, it belongs to microfiltration membranes and is defined by the particle size that can pass through; So, for it, the blockage problem is the key. For wastewater that is prone to scaling, contains oily substances, and viscous substances, it is recommended not to use the MBR membrane method; The types of wastewater that are not suitable for MBR method include: emulsion/grinding fluid/quenching fluid/coolant wastewater, surfactant wastewater, petroleum wastewater, and lipid wastewater (except for pre-treatment measures).

The MBR membrane method is now increasingly widely used, and its stable and clear effluent is of great concern. However, its huge maintenance volume also causes headaches for many users; So in order to minimize the intensity of maintenance work during use, the following issues need to be noted during the design phase:

Design points of MBR aeration device

1. The aeration device can be fixed at the bottom of the pool (requiring a membrane component support frame and a membrane component sliding guide rail), or can be made together with the membrane component, each with its own advantages and disadvantages. The position of the aeration pipe needs to be carefully considered, using DN20 perforated pipes, with each membrane gap corresponding to one perforated pipe, and the size of the perforation Φ 2.0mm, with a perforation spacing of 100mm. The perforation positions of adjacent two pipes are staggered, and the orifice is arranged in a single row vertically upwards. There are many double row and oblique downwards practices, which I personally believe are not advisable. The settled sludge will not cause blockage to the orifice.

2. Roughly estimate the size of the aeration amount, based on empirical figures, according to a steam water ratio of 24:1 (conventional pool depth of 3.5m), and select a fan exhaust pressure head that is 0.01Mpa higher than the high liquid level; An air release valve is installed at the outlet of the fan, and 70% of the air volume can be discharged by fully opening the air release pipe. A silencer is installed on the air release port, which is used to control the DO value in the biochemical tank and protect the fan;

3. Each membrane component aeration is equipped with a separate regulating valve, and a separate control valve is required for the aeration of the entire biochemical tank. A microporous aeration device is used to ensure flexible adjustment of the mixing air volume and aeration air volume;

4. The DO control of the MBR tank is between 2.5 and 5, and the normal liquid level is about 3ppm. When the liquid level is different, the DO will also change, and it should not exceed 5.0ppm for a long time.

Chemical soaking cleaning

1. If conditions permit, in order to reduce work intensity and achieve the cleaning of the entire membrane module, it is necessary to ensure the positioning of the membrane module in and out of the tank. The water pipe and air pipe should be made with flexible connections that are easy to disassemble (if the air pipe is not connected to the membrane module, the air pipe should not be considered), and this flexible connection should be durable. Personally, it is recommended to use flange connections or brand double acting ball valves for connection, and the lifting and landing of the membrane module should be accompanied by a crane, Can effectively reduce labor intensity, with a driving license plate of 500kg (which can actually achieve a lifting weight of 1t);

2. Three chemical soaking tanks need to be made, with membrane components of sufficient size to be placed inside. After submerging the membrane filaments, a height of 500mm should be left, and each soaking tank should be equipped with perforated aeration pipes and protective platforms; The total depth of the soaking tank=the height of the platform at the bottom of the tank+the height from the bottom of the membrane module to the upper layer of the membrane wire+500mm superelevation;

3. Two liquid storage tanks should be installed next to the three soaking tanks, with a capacity greater than the effective volume of the soaking tank, to reuse the cleaning solution;

4. Each soaking tank should be equipped with one plastic sewage pump to transfer the medicine solution from the soaking tank to a storage tank or discharge it;

5. To consider the treatment method of the waste liquid after washing, NaOH can be added as a reagent to the system, NaCLO can be directly discharged or stored for reuse after clarification treatment, and citric acid can be slowly added to the biochemical treatment system;

6. The stirring air volume of each soaking tank is designed according to intense stirring and equipped with a regulating valve;

7. The soaking tank should be equipped with a pipe for adding tap water, which should be thick to avoid wasting time on tap water injection. The filling time should be 10 minutes. According to the reference data, when the tap water pressure is 2-3 kilograms, the flow rate of the DN50 tap water pipe is about 18-22m3/hr;

8. Common chemical cleaning agents and concentrations:

NaOH (used for sterilization and cleaning of organic pollutants): concentration 1% -2%, soaking time>2 hours;

Citric acid (used to remove inorganic scale, omitted if not): concentration 2%, soaking time>2 hours;

NaClO (10% liquid, used for deep sterilization and restoration of membrane filtration function): concentration 5%, soaking time>2 hours;

Soak a single piece of alcohol (95% industrial grade alcohol) for 2 minutes to restore the membrane after dehydration, and omit it if not dehydrated;

9. Cleaning steps: water flushing → water immersion → alkaline solution immersion → citric acid immersion → NaClO immersion → water flushing → reset;

10. Note that citric acid is an organic acid and its use is not restricted. However, if it is used more than 1 month from the next time, it will mold and deteriorate during storage. It is recommended to use it once;

11. Note that after each cleaning, it is necessary to check for broken film wires, and for single broken wire tying treatment.