WHAT ARE THE WATER TREATMENT PLANT EFFECTS ON WASTEWATER IRRIGATION BENEFITS - PowerPoint PPT Presentation

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WHAT ARE THE WATER TREATMENT PLANT EFFECTS ON WASTEWATER IRRIGATION BENEFITS

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Title: WHAT ARE THE WATER TREATMENT PLANT EFFECTS ON WASTEWATER IRRIGATION BENEFITS


1
WHAT ARE THE WATER TREATMENT PLANT EFFECTS ON
WASTEWATER IRRIGATION BENEFITS?
  • A revision of a case study in the water-short
    Guanajuato river basin in west-central Mexico

Paula Silva and Christopher Scott
2
Background
  • In 1999 field research was carried out by IWMI to
    explore the benefits and risks of urban
    wastewater reuse for crop production along the
    Guanajuato river.
  • According to the completed research report (Scott
    et al, 2000), the benefits from wastewater
    irrigation include
  • additional water value,
  • nutrient value and
  • reduced (foregone) cost of water treatment.

3
NOM-001-1996 Water utility must pay fine of
USD 0.25/m3 for releasing untreated wastewater
into a water body
SIMAPAG (water supply utility) Water Treatment
Plant operating since June 2002
There are at least 140 hectares of land irrigated
with treated wastewater downstream of the city
of Guanajuato in two peri-urban communities San
Jose de Cervera and Santa Catarina
4
Guanajuato River
  • The Guanajuato river sub-basin encompasses the
    townships of Guanajuato city, Silao, Irapuato and
    Romita. The wastewater produced in these
    cities is normally diverted untreated along the
    whole sub-basin
  • Presence of multiple recycling loops. From the
    total river discharge of 0.305 m3/s, over half
    comprised of returns loops (multiple uses).
  • Diversion points for wastewater irrigation

5
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7
SIMAPAG
  • Record of highest financial surplus in
    Guanajuato province
  • General characteristics

8
Water treatment plant
  • Type sludge wastewater treatment. Liquid
    phase derivation box, mechanic sieve, raw
    wastewater pumping station, fine sieve,
    biological oxidation tank, secondary
    clarification and chlorine tank. Solid phase
    solid waste sludge management.
  • Investment cost USD 3.6 million (24 federal
    government, 40 local government and 36 SIMAPAG)
  • Plant layout
  • Design parameters
  • Treatment cost (production costs OM) USD
    0.11 / m3
  • Existing income 10 extra charge for
    sanitation services to customers (domestic USD
    0.04/m3, industrial and commercial USD
    0.08/m3). No treated water or solid waste is
    being sold

9
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10
Only 70 of total discharge is treated
11
Urban water reuse for crop production
  • INDIRECT and INFORMAL wastewater irrigation
  • Around 140 hectares of land irrigated with
    treated wastewater (different points of
    contamination and no water quality control at
    farm level)
  • Alfalfa is the main cultivated crop

12
What are the treatment plant effects on
wastewater irrigation benefits?
  • Water value impacts
  • The presence of the WTP gives the opportunity of
    selling the treated water competition
    among sectors likely (industrial price around
    USD 0.5/m3)
  • Nutrient value impacts
  • Existing concentration of Nitrogen and
    Phosphorous in the outgoing flow are enough to
    meet the Alfalfa requirements. No advantage of
    solid waste of WTP is taking place (30 to 40 ha
    could benefit).

13
What are the treatment plant effects on
wastewater irrigation benefits?
  • Water treatment cost impacts
  • Wastewater irrigation was not considered as an
    alternative method for wastewater treatment.

14
Final comments
  • The major impact of the WTP in wastewater
    irrigation could be the reduction of water
    availability if treated water is sold to
    industry. The informal wastewater irrigation is
    in a weak position for competition (only 30 to 40
    have proper water right and lower water
    productivity, USD 0.15/m3).

15
  • Enforcement of environmental regulations seem
    very effective and encourage wastewater treatment
    plants construction but wastewater irrigation
    benefits are not promoted
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