Loading

Guidelines for the Design of Small Sewage Treatment Plants

APPENDIX 2

FLOW AND LOAD FOR DIFFERENT TYPES OF DEVELOPMENT

 
FLOW
Type of development

Recommended design flow rate

(L/head/day)

Residential R1 300
Residential R2 370
Residential R3 460
Residential R4 460
Modern Village Housing 300
Traditional Type Village Housing 185
Temporary Housing Area (THA) 185
Schools (Not including canteen) 23 (students, staff etc.)
Offices (Not including canteen) 55
Services (shops etc.) 70 (for equivalent population)
Restaurants/canteens 0.5m3/m2 kitchen area/day
 

Explanatory notes on types of development

  • Private housing blocks in R1 zones, Private Sector Participation Schemes and Housing Authority Home Ownership Schemes
    Residential One (R1) is the highest density residential planned use. Population densities may be around 1 740 persons per hectare, with a maximum plot ratio of 8.0.
    Generally, densities and plot ratios for Private Sector Participation Schemes and Housing Authority Home Ownership Schemes are similar to those found in R1 estates.

  • Private housing blocks in R2 zones
    Residential Two (R2) is a medium density residential planned use. Population densities may be around 1 050 persons per hectare, with a maximum plot ratio of 5.0.

  • Private housing in R3 and R4 zones, villas and bungalows
    Residential Three (R3) is a medium to low density residential planned use. Population densities may be around 470 persons per hectare, with a maximum plot ratio of 3.0. Residential Four (R4) is a low density residential planned use. Building height is restricted to no more than 2 storeys with a maximum plot ratio of 0.4.

  • Modern Village Houses
    These are limited to a site area of approximately 65 square metres and to a height of 3 storeys, and which are in the New Territories Small House Category.

LOAD
Type of development Recommended BOD load (g/head/day) Recommended SS load(g/head/day)
Residential, all types 55 55
School (not including canteen) 23 23
Office (not including canteen) 23 23
Factories (not including industrial and canteen wastes) 23 23
Services to be pro-rata to equivalent residential population
Restaurants/Canteens 300 g/m2 kitchen area/d 300 g/m2 kitchen area/d

The use of garbage grinders may increase the per capita contribution of BOD by about 30% and of SS by 60%, and such increases should be taken into account in the design of the STP.

Download PDF

 

Back to topdot_clear.gifBackTable of Content

 

User review date: 
Monday, 17 September, 2018