The treatment of water treatment

1. one is to be treated to the standard of drinking water and directly reused in daily life, that is, to realize the direct recycling of water resources, this treatment is suitable for the extreme lack of water resources in the region, but the investment is high, the process is complex;

2. the other is to be treated to the standard of non-drinking water, mainly used for the water that does not come into direct contact with the human body, such as toilet flushing, the ground, car washing, greening watering, fire fighting, industrial general water, etc. This is the usual way of water treatment.

1.1 Reuse characteristics after secondary treatment

a. is a traditional form of treatment, process maturity, sludge production is small, less investment in equipment;

b. domestic sewage (excluding feces) as a source of water, the requirements of the drainage of feces, sewage diversion;

c. the raw water of the time, seasonal changes in the flow of water, the balance of the water difficulties;

d. . The quality of the effluent water can only meet the requirements of toilet flushing and greening.

1.2 Water balance

Water balance is the key to the design of the water system, which is not only the basic basis for determining the treatment capacity of the equipment, but also a reliable guarantee of the operation of the water system, but also a prerequisite to reduce the operating costs of water, using the first reuse program of water balance

1.3 Equipment technical parameters

Through the analysis of the water balance. Determine the technical parameters of the equipment as follows:

Design capacity Q set = 150m3/d

Conditioning pool volume V = 0.4Q set = 60m3;

In the water pool volume V = 0.25Q set = 38m3 (design value of 40m3);

In the water supply pump Q pumps = 25Q/24 = 14.3m3/h; H = 392～441kPa, N=4kW.

1.4 Its characteristics are:

a. It is a traditional form of treatment, the process is mature, the sludge production is large, the investment in equipment is more;

b. To use the domestic wastewater (including fecal matter) as a source of water, no need for fecal matter, sewage diversion, reduces the initial investment in the pipeline network;

c. Raw water time and seasonal flow change is small, sufficient water;

C. The raw water is not a source of water. Smaller, sufficient water sources;

d. Water quality can only meet the requirements of toilet flushing and greening.

2.2 Water balance

The water balance of the second program.

2.3 Equipment Technical Parameters

The technical parameters of the equipment are the same as 1.3.

2.4 Economic Analysis

3.1 Characteristics

Features:

b. The renewal of membranes will increase the operating costs;

3.2 Water Balance

The third scenario of the water balance

3.3 Technical parameters of equipment

Design treatment capacity Q set = 180m3/d;

Conditioning pool volume V adjustment = 72m3 (design value adopted 70m3);

Center water pool volume V in = 45m3;

Center water supply pump Q pump = 2.5Q in/24 = 14.8m3/h; H = 392 ~ 441kPa N=4kW.

3.4 Economic analysis

3.1 It is characterized by:

a. It is a new type of treatment process, the sludge production is very small and it adopts PLC auto-control, which is easy to operate but with much investment in equipments;

b. Membrane updating will increase the operation cost;

d. Raw water's hourly and seasonal flow rate varies little, and there is sufficient water source;

e. Good quality of effluent water, in addition to meeting the requirements of toilet flushing and greening, can also be used for car washing.

3.2 Water Balance

Water Balance of the Third Scheme

3.3 Technical Parameters of the Equipment

Designed treatment capacity Q set=180m3/d;

Regulating pool volume V adjustment=72m3 (design value adopts 70m3);

Central Water Pool volume V center=45m3;

Middle water supply pump Q pump=2.5Q in/24=14.8m3/h;H=392～441kPa, N=4kW.

3.4 Economic analysis

3.1 It is characterized as follows:

b. Membrane updating will increase the operation cost;

3.2 Water balance

Water balance of the third scheme

3.3 Equipment Technical Parameters

Design treatment capacity Q set = 180m3/d;

Conditioning tank volume V adjustment = 72m3 (design value using 70m3);

Central water pool volume V in = 45m3;

Central water supply pump Q pump = 2.5Q in/24 = 14.8m3/h; H = 392 ~ 441kPa, N = 392~ 441kPa, N=4kW.

3.4 Economic analysis through the comparison of the initial investment and operating costs of the three treatment methods can be seen, the traditional method of sewage reuse (feces, sewage diversion) although the equipment costs and treatment costs are lower, can be diverted to increase the cost of the pipeline network drainage but make the initial investment is greatly increased, which produces a high depreciation of the operating cost of the process has a low cost advantage of the process is completely lost, therefore, the process has a low cost advantage. The advantage of low cost is completely lost, so it is not suitable for water treatment in residential areas.

The same is the treatment of domestic sewage, the traditional tertiary treatment method than the MBR method, although the initial investment and operating costs are low, but the advantage is not obvious, and MBR provides high-quality water from the user's psychology is more acceptable, and can extend the water supply equipment, pipeline networks and appliances service life, and then high-quality water used for car wash the economic benefits can not be ignored. With the development of membrane production technology, membrane module price reduction, MBR investment costs and operating costs will be reduced, which has been confirmed in Japan. Therefore, from the perspective of development, small footprint, do not pollute the environment, a high degree of self-control, reliable operation of the MBR method should be the first choice of water reuse process in residential areas.

The conditions for the construction of water systems in residential areas are basically in place, and are becoming more and more perfect. First of all, the residential area drainage, miscellaneous water demand is also large, easy to balance the amount of water, the design and smooth operation of the water system is advantageous; Secondly, with the scale of urban residential district and the development of water treatment technology, the initial investment in the water system and the operating costs will be greatly reduced; again, the privatization of housing, community property management and the rise of the perfect for the return on investment for the water system has laid the foundation. After the adoption of the water system is expected to save 30% to 40% of water consumption in residential areas, drainage can be reduced by 35% to 50%, will produce good social and environmental benefits.